/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=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.3 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-22 04:40:38,704 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 04:40:38,707 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 04:40:38,745 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 04:40:38,746 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 04:40:38,755 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 04:40:38,757 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 04:40:38,760 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 04:40:38,763 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 04:40:38,766 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 04:40:38,766 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 04:40:38,767 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 04:40:38,768 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 04:40:38,770 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 04:40:38,773 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 04:40:38,774 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 04:40:38,776 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 04:40:38,777 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 04:40:38,779 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 04:40:38,787 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 04:40:38,789 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 04:40:38,790 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 04:40:38,791 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 04:40:38,792 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 04:40:38,805 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-22 04:40:38,809 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-22 04:40:38,809 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-22 04:40:38,810 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-22 04:40:38,810 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-22 04:40:38,811 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-22 04:40:38,822 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 04:40:38,824 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 04:40:38,825 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 04:40:38,826 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 [2020-08-22 04:40:38,864 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 04:40:38,864 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 04:40:38,867 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 04:40:38,867 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 04:40:38,867 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 04:40:38,867 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 04:40:38,868 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 04:40:38,868 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 04:40:38,868 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 04:40:38,868 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 04:40:38,869 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 04:40:38,870 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 04:40:38,870 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 04:40:38,870 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 04:40:38,870 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 04:40:38,871 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 04:40:38,871 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 04:40:38,871 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 04:40:38,871 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 04:40:38,871 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 04:40:38,872 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 04:40:38,872 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 04:40:38,872 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 04:40:38,872 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 04:40:38,872 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 04:40:38,873 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 04:40:38,873 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 04:40:38,873 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 04:40:38,873 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 04:40:38,873 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=SMALLESTAMONGWIDE;tolerance=0.3;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3;log-additional-information=true; [2020-08-22 04:40:39,210 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 04:40:39,220 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 04:40:39,224 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 04:40:39,225 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 04:40:39,225 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 04:40:39,226 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-22 04:40:39,284 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a1ec48ce2/1c33096d6afe4e1a9a7e654505ccb214/FLAG34de01eb6 [2020-08-22 04:40:39,718 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 04:40:39,719 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-22 04:40:39,725 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a1ec48ce2/1c33096d6afe4e1a9a7e654505ccb214/FLAG34de01eb6 [2020-08-22 04:40:40,041 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a1ec48ce2/1c33096d6afe4e1a9a7e654505ccb214 [2020-08-22 04:40:40,051 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 04:40:40,053 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 04:40:40,055 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 04:40:40,055 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 04:40:40,058 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 04:40:40,059 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:40:40" (1/1) ... [2020-08-22 04:40:40,062 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7225e1e6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:40:40, skipping insertion in model container [2020-08-22 04:40:40,063 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:40:40" (1/1) ... [2020-08-22 04:40:40,071 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 04:40:40,090 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 04:40:40,266 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 04:40:40,276 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 04:40:40,298 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 04:40:40,314 INFO L208 MainTranslator]: Completed translation [2020-08-22 04:40:40,315 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:40:40 WrapperNode [2020-08-22 04:40:40,315 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 04:40:40,316 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 04:40:40,316 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 04:40:40,316 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 04:40:40,407 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:40:40" (1/1) ... [2020-08-22 04:40:40,407 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:40:40" (1/1) ... [2020-08-22 04:40:40,423 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:40:40" (1/1) ... [2020-08-22 04:40:40,424 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:40:40" (1/1) ... [2020-08-22 04:40:40,436 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:40:40" (1/1) ... [2020-08-22 04:40:40,441 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:40:40" (1/1) ... [2020-08-22 04:40:40,443 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:40:40" (1/1) ... [2020-08-22 04:40:40,446 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 04:40:40,446 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 04:40:40,446 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 04:40:40,446 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 04:40:40,447 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:40:40" (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 [2020-08-22 04:40:40,504 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 04:40:40,504 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 04:40:40,504 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-08-22 04:40:40,504 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 04:40:40,504 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 04:40:40,505 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-22 04:40:40,505 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-22 04:40:40,505 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-22 04:40:40,505 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-22 04:40:40,505 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 04:40:40,505 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-22 04:40:40,506 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-22 04:40:40,506 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-22 04:40:40,506 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-22 04:40:40,506 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 04:40:40,506 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 04:40:40,810 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 04:40:40,811 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-22 04:40:40,816 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:40:40 BoogieIcfgContainer [2020-08-22 04:40:40,817 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 04:40:40,819 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 04:40:40,819 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 04:40:40,822 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 04:40:40,822 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 04:40:40" (1/3) ... [2020-08-22 04:40:40,823 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@568b6bce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:40:40, skipping insertion in model container [2020-08-22 04:40:40,823 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:40:40" (2/3) ... [2020-08-22 04:40:40,824 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@568b6bce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:40:40, skipping insertion in model container [2020-08-22 04:40:40,824 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:40:40" (3/3) ... [2020-08-22 04:40:40,826 INFO L109 eAbstractionObserver]: Analyzing ICFG test25-2.c [2020-08-22 04:40:40,840 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 04:40:40,849 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 04:40:40,867 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 04:40:40,897 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 04:40:40,897 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 04:40:40,897 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 04:40:40,897 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 04:40:40,897 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 04:40:40,898 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 04:40:40,898 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 04:40:40,898 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 04:40:40,920 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-22 04:40:40,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-22 04:40:40,927 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:40:40,931 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:40:40,932 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:40:40,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:40:40,943 INFO L82 PathProgramCache]: Analyzing trace with hash -899836778, now seen corresponding path program 1 times [2020-08-22 04:40:40,953 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:40:40,954 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [343847788] [2020-08-22 04:40:40,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:40:41,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:41,197 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:40:41,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:41,220 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-22 04:40:41,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:41,259 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:40:41,262 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [343847788] [2020-08-22 04:40:41,266 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 04:40:41,267 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 04:40:41,268 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971386399] [2020-08-22 04:40:41,275 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 04:40:41,276 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:40:41,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 04:40:41,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 04:40:41,295 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-08-22 04:40:41,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:40:41,415 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2020-08-22 04:40:41,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 04:40:41,417 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-22 04:40:41,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:40:41,428 INFO L225 Difference]: With dead ends: 42 [2020-08-22 04:40:41,428 INFO L226 Difference]: Without dead ends: 20 [2020-08-22 04:40:41,432 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 04:40:41,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-22 04:40:41,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-22 04:40:41,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-22 04:40:41,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-08-22 04:40:41,471 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-08-22 04:40:41,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:40:41,472 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-08-22 04:40:41,472 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 04:40:41,472 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-08-22 04:40:41,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-22 04:40:41,473 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:40:41,473 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:40:41,474 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 04:40:41,474 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:40:41,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:40:41,475 INFO L82 PathProgramCache]: Analyzing trace with hash -1137678901, now seen corresponding path program 1 times [2020-08-22 04:40:41,475 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:40:41,475 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1600553691] [2020-08-22 04:40:41,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:40:41,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:41,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:40:41,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:41,579 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 04:40:41,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:41,589 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:40:41,590 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1600553691] [2020-08-22 04:40:41,590 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 04:40:41,590 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 04:40:41,591 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972278485] [2020-08-22 04:40:41,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 04:40:41,593 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:40:41,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 04:40:41,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 04:40:41,594 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-08-22 04:40:41,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:40:41,687 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-08-22 04:40:41,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 04:40:41,688 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-08-22 04:40:41,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:40:41,689 INFO L225 Difference]: With dead ends: 34 [2020-08-22 04:40:41,689 INFO L226 Difference]: Without dead ends: 22 [2020-08-22 04:40:41,690 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 04:40:41,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-22 04:40:41,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-22 04:40:41,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-22 04:40:41,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-22 04:40:41,697 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-08-22 04:40:41,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:40:41,698 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-22 04:40:41,698 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 04:40:41,698 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-22 04:40:41,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-22 04:40:41,699 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:40:41,700 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:40:41,700 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 04:40:41,700 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:40:41,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:40:41,701 INFO L82 PathProgramCache]: Analyzing trace with hash 278779309, now seen corresponding path program 1 times [2020-08-22 04:40:41,701 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:40:41,702 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1177156012] [2020-08-22 04:40:41,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:40:41,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:41,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:40:41,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:41,774 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-08-22 04:40:41,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:41,782 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:40:41,783 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1177156012] [2020-08-22 04:40:41,783 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:40:41,783 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-22 04:40:41,784 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851270157] [2020-08-22 04:40:41,784 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 04:40:41,785 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:40:41,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 04:40:41,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-22 04:40:41,786 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-08-22 04:40:41,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:40:41,860 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-08-22 04:40:41,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 04:40:41,861 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-08-22 04:40:41,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:40:41,862 INFO L225 Difference]: With dead ends: 36 [2020-08-22 04:40:41,862 INFO L226 Difference]: Without dead ends: 24 [2020-08-22 04:40:41,863 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-22 04:40:41,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-22 04:40:41,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-22 04:40:41,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-22 04:40:41,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-22 04:40:41,870 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-08-22 04:40:41,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:40:41,870 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-22 04:40:41,871 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 04:40:41,871 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-22 04:40:41,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-22 04:40:41,872 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:40:41,872 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:40:41,873 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 04:40:41,873 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:40:41,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:40:41,873 INFO L82 PathProgramCache]: Analyzing trace with hash -9513713, now seen corresponding path program 2 times [2020-08-22 04:40:41,874 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:40:41,874 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [835400812] [2020-08-22 04:40:41,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:40:41,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:41,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:40:41,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:41,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-22 04:40:41,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:41,978 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:40:41,979 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [835400812] [2020-08-22 04:40:41,979 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:40:41,979 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 04:40:41,980 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [594633328] [2020-08-22 04:40:41,980 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 04:40:41,980 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:40:41,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 04:40:41,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-22 04:40:41,981 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 6 states. [2020-08-22 04:40:42,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:40:42,082 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-08-22 04:40:42,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 04:40:42,083 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-22 04:40:42,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:40:42,084 INFO L225 Difference]: With dead ends: 38 [2020-08-22 04:40:42,084 INFO L226 Difference]: Without dead ends: 26 [2020-08-22 04:40:42,085 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-22 04:40:42,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-22 04:40:42,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-22 04:40:42,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-22 04:40:42,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-08-22 04:40:42,092 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-08-22 04:40:42,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:40:42,092 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-08-22 04:40:42,092 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 04:40:42,093 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-08-22 04:40:42,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-22 04:40:42,093 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:40:42,094 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:40:42,094 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 04:40:42,094 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:40:42,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:40:42,095 INFO L82 PathProgramCache]: Analyzing trace with hash 2113766385, now seen corresponding path program 3 times [2020-08-22 04:40:42,095 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:40:42,095 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1224929571] [2020-08-22 04:40:42,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:40:42,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:42,185 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:40:42,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:42,190 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-22 04:40:42,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:42,200 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:40:42,200 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1224929571] [2020-08-22 04:40:42,201 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:40:42,201 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 04:40:42,202 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904967429] [2020-08-22 04:40:42,202 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 04:40:42,202 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:40:42,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 04:40:42,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-22 04:40:42,203 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 7 states. [2020-08-22 04:40:42,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:40:42,277 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-08-22 04:40:42,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 04:40:42,278 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-08-22 04:40:42,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:40:42,279 INFO L225 Difference]: With dead ends: 40 [2020-08-22 04:40:42,279 INFO L226 Difference]: Without dead ends: 28 [2020-08-22 04:40:42,280 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-22 04:40:42,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-22 04:40:42,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-22 04:40:42,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-22 04:40:42,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-22 04:40:42,286 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-08-22 04:40:42,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:40:42,286 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-22 04:40:42,287 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 04:40:42,287 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-22 04:40:42,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-22 04:40:42,288 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:40:42,288 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:40:42,288 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 04:40:42,288 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:40:42,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:40:42,289 INFO L82 PathProgramCache]: Analyzing trace with hash -1818492333, now seen corresponding path program 4 times [2020-08-22 04:40:42,289 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:40:42,290 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2142042178] [2020-08-22 04:40:42,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:40:42,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:42,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:40:42,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:42,387 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-08-22 04:40:42,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:42,391 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:40:42,392 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2142042178] [2020-08-22 04:40:42,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:40:42,392 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 04:40:42,393 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857368348] [2020-08-22 04:40:42,393 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 04:40:42,393 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:40:42,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 04:40:42,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-22 04:40:42,394 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2020-08-22 04:40:42,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:40:42,454 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-08-22 04:40:42,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 04:40:42,454 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-08-22 04:40:42,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:40:42,455 INFO L225 Difference]: With dead ends: 42 [2020-08-22 04:40:42,456 INFO L226 Difference]: Without dead ends: 30 [2020-08-22 04:40:42,456 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-22 04:40:42,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-22 04:40:42,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-22 04:40:42,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-22 04:40:42,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-08-22 04:40:42,462 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-08-22 04:40:42,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:40:42,462 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-08-22 04:40:42,462 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 04:40:42,462 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-08-22 04:40:42,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-22 04:40:42,463 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:40:42,463 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:40:42,464 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 04:40:42,464 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:40:42,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:40:42,464 INFO L82 PathProgramCache]: Analyzing trace with hash -1147899851, now seen corresponding path program 5 times [2020-08-22 04:40:42,465 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:40:42,465 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1741124247] [2020-08-22 04:40:42,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:40:42,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:42,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:40:42,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:42,574 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-22 04:40:42,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:42,582 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:40:42,582 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1741124247] [2020-08-22 04:40:42,582 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:40:42,583 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-22 04:40:42,583 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727323600] [2020-08-22 04:40:42,583 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 04:40:42,583 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:40:42,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 04:40:42,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-22 04:40:42,585 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-08-22 04:40:42,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:40:42,676 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-08-22 04:40:42,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 04:40:42,677 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-08-22 04:40:42,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:40:42,678 INFO L225 Difference]: With dead ends: 44 [2020-08-22 04:40:42,679 INFO L226 Difference]: Without dead ends: 32 [2020-08-22 04:40:42,679 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-22 04:40:42,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-22 04:40:42,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-22 04:40:42,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-22 04:40:42,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-08-22 04:40:42,686 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-08-22 04:40:42,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:40:42,686 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-08-22 04:40:42,686 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 04:40:42,686 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-08-22 04:40:42,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-22 04:40:42,687 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:40:42,688 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:40:42,688 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 04:40:42,688 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:40:42,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:40:42,689 INFO L82 PathProgramCache]: Analyzing trace with hash -953619049, now seen corresponding path program 6 times [2020-08-22 04:40:42,689 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:40:42,689 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1413130771] [2020-08-22 04:40:42,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:40:42,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:42,796 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:40:42,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:42,800 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-22 04:40:42,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:42,806 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:40:42,807 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1413130771] [2020-08-22 04:40:42,807 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:40:42,807 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-22 04:40:42,808 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531489294] [2020-08-22 04:40:42,808 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 04:40:42,808 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:40:42,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 04:40:42,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-22 04:40:42,809 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2020-08-22 04:40:42,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:40:42,913 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-08-22 04:40:42,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 04:40:42,913 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-08-22 04:40:42,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:40:42,914 INFO L225 Difference]: With dead ends: 46 [2020-08-22 04:40:42,914 INFO L226 Difference]: Without dead ends: 34 [2020-08-22 04:40:42,915 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-22 04:40:42,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-22 04:40:42,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-22 04:40:42,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-22 04:40:42,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-22 04:40:42,921 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-08-22 04:40:42,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:40:42,921 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-22 04:40:42,922 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 04:40:42,922 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-22 04:40:42,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-22 04:40:42,923 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:40:42,923 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:40:42,923 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 04:40:42,924 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:40:42,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:40:42,924 INFO L82 PathProgramCache]: Analyzing trace with hash 1066637945, now seen corresponding path program 7 times [2020-08-22 04:40:42,924 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:40:42,925 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [796181747] [2020-08-22 04:40:42,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:40:42,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:43,048 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:40:43,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:43,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-22 04:40:43,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:43,056 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:40:43,057 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [796181747] [2020-08-22 04:40:43,057 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:40:43,057 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-22 04:40:43,058 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877739349] [2020-08-22 04:40:43,058 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 04:40:43,058 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:40:43,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 04:40:43,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-22 04:40:43,059 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-22 04:40:43,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:40:43,157 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-22 04:40:43,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-22 04:40:43,158 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-08-22 04:40:43,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:40:43,159 INFO L225 Difference]: With dead ends: 48 [2020-08-22 04:40:43,159 INFO L226 Difference]: Without dead ends: 36 [2020-08-22 04:40:43,160 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-22 04:40:43,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-22 04:40:43,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-22 04:40:43,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-22 04:40:43,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-08-22 04:40:43,165 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-08-22 04:40:43,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:40:43,165 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-08-22 04:40:43,166 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 04:40:43,166 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-08-22 04:40:43,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-22 04:40:43,167 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:40:43,167 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:40:43,167 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 04:40:43,167 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:40:43,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:40:43,168 INFO L82 PathProgramCache]: Analyzing trace with hash 1208391387, now seen corresponding path program 8 times [2020-08-22 04:40:43,168 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:40:43,168 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1020069877] [2020-08-22 04:40:43,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:40:43,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:43,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:40:43,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:43,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-22 04:40:43,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:43,343 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:40:43,344 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1020069877] [2020-08-22 04:40:43,344 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:40:43,345 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-22 04:40:43,345 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939749483] [2020-08-22 04:40:43,345 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-22 04:40:43,346 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:40:43,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-22 04:40:43,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-22 04:40:43,346 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 12 states. [2020-08-22 04:40:43,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:40:43,454 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-08-22 04:40:43,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-22 04:40:43,454 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-22 04:40:43,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:40:43,455 INFO L225 Difference]: With dead ends: 50 [2020-08-22 04:40:43,456 INFO L226 Difference]: Without dead ends: 38 [2020-08-22 04:40:43,458 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-22 04:40:43,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-22 04:40:43,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-22 04:40:43,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-22 04:40:43,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-08-22 04:40:43,467 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-08-22 04:40:43,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:40:43,469 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-08-22 04:40:43,469 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-22 04:40:43,469 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-08-22 04:40:43,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-22 04:40:43,471 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:40:43,471 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:40:43,471 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-22 04:40:43,472 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:40:43,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:40:43,472 INFO L82 PathProgramCache]: Analyzing trace with hash -5504323, now seen corresponding path program 9 times [2020-08-22 04:40:43,472 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:40:43,473 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2112642611] [2020-08-22 04:40:43,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:40:43,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:43,640 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:40:43,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:43,643 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-22 04:40:43,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:43,649 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 04:40:43,650 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2112642611] [2020-08-22 04:40:43,650 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:40:43,650 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-22 04:40:43,650 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [921837900] [2020-08-22 04:40:43,652 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 04:40:43,652 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:40:43,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 04:40:43,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-22 04:40:43,653 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 13 states. [2020-08-22 04:40:43,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:40:43,753 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-08-22 04:40:43,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 04:40:43,753 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-22 04:40:43,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:40:43,754 INFO L225 Difference]: With dead ends: 51 [2020-08-22 04:40:43,754 INFO L226 Difference]: Without dead ends: 39 [2020-08-22 04:40:43,755 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-22 04:40:43,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-22 04:40:43,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-22 04:40:43,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-22 04:40:43,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-22 04:40:43,761 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-08-22 04:40:43,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:40:43,761 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-22 04:40:43,762 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 04:40:43,762 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-22 04:40:43,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-22 04:40:43,762 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:40:43,763 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:40:43,763 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-22 04:40:43,763 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:40:43,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:40:43,763 INFO L82 PathProgramCache]: Analyzing trace with hash 1671822879, now seen corresponding path program 10 times [2020-08-22 04:40:43,764 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:40:43,764 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1472133243] [2020-08-22 04:40:43,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:40:43,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:40:54,361 WARN L193 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 8 [2020-08-22 04:40:55,452 WARN L193 SmtUtils]: Spent 834.00 ms on a formula simplification. DAG size of input: 567 DAG size of output: 11 [2020-08-22 04:40:59,628 WARN L193 SmtUtils]: Spent 3.75 s on a formula simplification. DAG size of input: 1063 DAG size of output: 8 [2020-08-22 04:41:27,751 WARN L193 SmtUtils]: Spent 27.32 s on a formula simplification. DAG size of input: 2458 DAG size of output: 8 [2020-08-22 04:41:28,052 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 31 [2020-08-22 04:41:28,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:41:28,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:41:28,139 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-22 04:41:28,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:41:28,147 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-22 04:41:28,148 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1472133243] [2020-08-22 04:41:28,148 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:41:28,148 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-22 04:41:28,149 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505669518] [2020-08-22 04:41:28,149 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-22 04:41:28,150 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:41:28,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-22 04:41:28,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2020-08-22 04:41:28,150 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 16 states. [2020-08-22 04:41:28,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:41:28,591 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-22 04:41:28,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-22 04:41:28,592 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-22 04:41:28,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:41:28,593 INFO L225 Difference]: With dead ends: 49 [2020-08-22 04:41:28,593 INFO L226 Difference]: Without dead ends: 41 [2020-08-22 04:41:28,597 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 33.5s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-22 04:41:28,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-22 04:41:28,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-22 04:41:28,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-22 04:41:28,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-08-22 04:41:28,606 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-08-22 04:41:28,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:41:28,609 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-08-22 04:41:28,609 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-22 04:41:28,610 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-08-22 04:41:28,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-22 04:41:28,613 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:41:28,613 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:41:28,613 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-22 04:41:28,614 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:41:28,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:41:28,614 INFO L82 PathProgramCache]: Analyzing trace with hash 443458522, now seen corresponding path program 1 times [2020-08-22 04:41:28,615 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:41:28,615 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1588834474] [2020-08-22 04:41:28,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:41:28,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:41:32,846 WARN L193 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 180 DAG size of output: 8 [2020-08-22 04:41:33,919 WARN L193 SmtUtils]: Spent 858.00 ms on a formula simplification. DAG size of input: 401 DAG size of output: 8 [2020-08-22 04:41:38,121 WARN L193 SmtUtils]: Spent 3.85 s on a formula simplification. DAG size of input: 830 DAG size of output: 8 [2020-08-22 04:41:38,333 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 45 [2020-08-22 04:41:38,655 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:41:38,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:41:38,659 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-22 04:41:38,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:41:38,709 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 101 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-22 04:41:38,709 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1588834474] [2020-08-22 04:41:38,713 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 04:41:38,713 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-22 04:41:38,714 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577327466] [2020-08-22 04:41:38,714 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-22 04:41:38,714 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:41:38,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-22 04:41:38,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=370, Unknown=0, NotChecked=0, Total=420 [2020-08-22 04:41:38,716 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 21 states. [2020-08-22 04:41:39,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:41:39,638 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-22 04:41:39,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-22 04:41:39,638 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 40 [2020-08-22 04:41:39,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:41:39,640 INFO L225 Difference]: With dead ends: 48 [2020-08-22 04:41:39,641 INFO L226 Difference]: Without dead ends: 43 [2020-08-22 04:41:39,641 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=94, Invalid=718, Unknown=0, NotChecked=0, Total=812 [2020-08-22 04:41:39,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-22 04:41:39,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-22 04:41:39,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-22 04:41:39,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-08-22 04:41:39,657 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-08-22 04:41:39,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:41:39,657 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-08-22 04:41:39,657 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-22 04:41:39,657 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-08-22 04:41:39,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-22 04:41:39,658 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:41:39,658 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 04:41:39,659 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-22 04:41:39,659 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:41:39,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:41:39,659 INFO L82 PathProgramCache]: Analyzing trace with hash 1101317845, now seen corresponding path program 2 times [2020-08-22 04:41:39,659 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:41:39,660 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [157014479] [2020-08-22 04:41:39,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:41:39,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat