/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 false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test24-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-eb0fd7c [2020-09-21 10:21:23,861 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-21 10:21:23,866 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-21 10:21:23,913 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-21 10:21:23,914 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-21 10:21:23,925 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-21 10:21:23,928 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-21 10:21:23,931 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-21 10:21:23,933 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-21 10:21:23,935 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-21 10:21:23,936 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-21 10:21:23,939 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-21 10:21:23,939 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-21 10:21:23,945 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-21 10:21:23,947 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-21 10:21:23,949 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-21 10:21:23,951 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-21 10:21:23,954 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-21 10:21:23,956 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-21 10:21:23,967 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-21 10:21:23,969 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-21 10:21:23,971 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-21 10:21:23,972 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-21 10:21:23,973 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-21 10:21:23,976 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-21 10:21:23,987 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-21 10:21:23,989 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-21 10:21:23,990 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-21 10:21:23,991 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-09-21 10:21:24,037 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-21 10:21:24,038 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-21 10:21:24,039 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-21 10:21:24,039 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-21 10:21:24,039 INFO L138 SettingsManager]: * Use SBE=true [2020-09-21 10:21:24,040 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-21 10:21:24,040 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-21 10:21:24,040 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-21 10:21:24,040 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-21 10:21:24,040 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-21 10:21:24,041 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-21 10:21:24,041 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-21 10:21:24,041 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-21 10:21:24,041 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-21 10:21:24,042 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-21 10:21:24,042 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-21 10:21:24,042 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-21 10:21:24,042 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-21 10:21:24,042 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-21 10:21:24,043 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-21 10:21:24,043 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-21 10:21:24,043 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 10:21:24,043 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-21 10:21:24,043 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-21 10:21:24,044 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-21 10:21:24,044 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-21 10:21:24,044 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-21 10:21:24,044 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-21 10:21:24,044 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-21 10:21:24,045 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 -> false [2020-09-21 10:21:24,513 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-21 10:21:24,536 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-21 10:21:24,540 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-21 10:21:24,542 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-21 10:21:24,545 INFO L275 PluginConnector]: CDTParser initialized [2020-09-21 10:21:24,546 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test24-2.c [2020-09-21 10:21:24,639 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5e8a6231d/062b8c2458c4451fad9e16d8fec46ebc/FLAG97b599f27 [2020-09-21 10:21:25,205 INFO L306 CDTParser]: Found 1 translation units. [2020-09-21 10:21:25,206 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/test24-2.c [2020-09-21 10:21:25,215 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5e8a6231d/062b8c2458c4451fad9e16d8fec46ebc/FLAG97b599f27 [2020-09-21 10:21:25,530 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5e8a6231d/062b8c2458c4451fad9e16d8fec46ebc [2020-09-21 10:21:25,545 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-21 10:21:25,552 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-21 10:21:25,553 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-21 10:21:25,553 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-21 10:21:25,557 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-21 10:21:25,559 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:21:25" (1/1) ... [2020-09-21 10:21:25,564 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@78523b67 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:21:25, skipping insertion in model container [2020-09-21 10:21:25,564 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:21:25" (1/1) ... [2020-09-21 10:21:25,573 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-21 10:21:25,600 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-21 10:21:25,866 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:21:25,877 INFO L203 MainTranslator]: Completed pre-run [2020-09-21 10:21:25,935 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:21:25,950 INFO L208 MainTranslator]: Completed translation [2020-09-21 10:21:25,951 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:21:25 WrapperNode [2020-09-21 10:21:25,951 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-21 10:21:25,952 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-21 10:21:25,952 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-21 10:21:25,952 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-21 10:21:26,034 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:21:25" (1/1) ... [2020-09-21 10:21:26,034 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:21:25" (1/1) ... [2020-09-21 10:21:26,044 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:21:25" (1/1) ... [2020-09-21 10:21:26,045 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:21:25" (1/1) ... [2020-09-21 10:21:26,060 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:21:25" (1/1) ... [2020-09-21 10:21:26,066 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:21:25" (1/1) ... [2020-09-21 10:21:26,068 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:21:25" (1/1) ... [2020-09-21 10:21:26,070 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-21 10:21:26,071 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-21 10:21:26,071 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-21 10:21:26,071 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-21 10:21:26,073 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:21:25" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 10:21:26,171 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-21 10:21:26,172 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-21 10:21:26,172 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-09-21 10:21:26,172 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-21 10:21:26,172 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-21 10:21:26,173 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-09-21 10:21:26,173 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-09-21 10:21:26,173 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-09-21 10:21:26,173 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-21 10:21:26,173 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-09-21 10:21:26,173 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-09-21 10:21:26,174 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-09-21 10:21:26,174 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-21 10:21:26,174 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-21 10:21:26,491 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-21 10:21:26,491 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-09-21 10:21:26,496 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:21:26 BoogieIcfgContainer [2020-09-21 10:21:26,497 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-21 10:21:26,498 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-21 10:21:26,499 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-21 10:21:26,502 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-21 10:21:26,503 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.09 10:21:25" (1/3) ... [2020-09-21 10:21:26,504 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4cd47397 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:21:26, skipping insertion in model container [2020-09-21 10:21:26,504 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:21:25" (2/3) ... [2020-09-21 10:21:26,504 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4cd47397 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:21:26, skipping insertion in model container [2020-09-21 10:21:26,504 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:21:26" (3/3) ... [2020-09-21 10:21:26,506 INFO L109 eAbstractionObserver]: Analyzing ICFG test24-2.c [2020-09-21 10:21:26,516 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-21 10:21:26,526 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-21 10:21:26,548 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-21 10:21:26,573 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-21 10:21:26,574 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-21 10:21:26,574 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-21 10:21:26,574 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-21 10:21:26,574 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-21 10:21:26,574 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-21 10:21:26,574 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-21 10:21:26,574 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-21 10:21:26,595 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-09-21 10:21:26,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-09-21 10:21:26,601 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:26,602 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:21:26,603 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:26,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:26,610 INFO L82 PathProgramCache]: Analyzing trace with hash 855240046, now seen corresponding path program 1 times [2020-09-21 10:21:26,620 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:26,621 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [684519699] [2020-09-21 10:21:26,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:26,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:26,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:26,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:26,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-21 10:21:26,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:26,852 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:26,853 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [684519699] [2020-09-21 10:21:26,855 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:21:26,856 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-09-21 10:21:26,857 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739603326] [2020-09-21 10:21:26,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-09-21 10:21:26,864 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:26,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-09-21 10:21:26,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-21 10:21:26,885 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-09-21 10:21:26,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:26,980 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2020-09-21 10:21:26,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-21 10:21:26,982 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-09-21 10:21:26,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:26,995 INFO L225 Difference]: With dead ends: 42 [2020-09-21 10:21:26,995 INFO L226 Difference]: Without dead ends: 20 [2020-09-21 10:21:26,999 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 [2020-09-21 10:21:27,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-09-21 10:21:27,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-09-21 10:21:27,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-09-21 10:21:27,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-09-21 10:21:27,048 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-09-21 10:21:27,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:27,049 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-09-21 10:21:27,049 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-09-21 10:21:27,049 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-09-21 10:21:27,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-09-21 10:21:27,050 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:27,050 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:21:27,051 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-21 10:21:27,051 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:27,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:27,052 INFO L82 PathProgramCache]: Analyzing trace with hash -1631497781, now seen corresponding path program 1 times [2020-09-21 10:21:27,052 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:27,052 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1831270838] [2020-09-21 10:21:27,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:27,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:27,131 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:27,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:27,140 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-21 10:21:27,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:27,151 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:27,151 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1831270838] [2020-09-21 10:21:27,151 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:21:27,152 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-21 10:21:27,152 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1135297626] [2020-09-21 10:21:27,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-21 10:21:27,154 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:27,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-21 10:21:27,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-21 10:21:27,155 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-09-21 10:21:27,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:27,225 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-09-21 10:21:27,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-21 10:21:27,226 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-09-21 10:21:27,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:27,227 INFO L225 Difference]: With dead ends: 34 [2020-09-21 10:21:27,228 INFO L226 Difference]: Without dead ends: 22 [2020-09-21 10:21:27,229 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 [2020-09-21 10:21:27,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-09-21 10:21:27,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-09-21 10:21:27,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-09-21 10:21:27,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-09-21 10:21:27,237 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-09-21 10:21:27,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:27,237 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-09-21 10:21:27,237 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-21 10:21:27,237 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-09-21 10:21:27,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-09-21 10:21:27,238 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:27,239 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] [2020-09-21 10:21:27,239 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-21 10:21:27,239 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:27,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:27,240 INFO L82 PathProgramCache]: Analyzing trace with hash 1934775405, now seen corresponding path program 1 times [2020-09-21 10:21:27,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:27,241 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1815019167] [2020-09-21 10:21:27,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:27,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:27,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:27,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:27,311 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-09-21 10:21:27,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:27,320 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:27,320 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1815019167] [2020-09-21 10:21:27,321 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:27,321 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-09-21 10:21:27,321 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526212713] [2020-09-21 10:21:27,322 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 10:21:27,322 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:27,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 10:21:27,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:21:27,323 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-09-21 10:21:27,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:27,406 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-09-21 10:21:27,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 10:21:27,407 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-09-21 10:21:27,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:27,408 INFO L225 Difference]: With dead ends: 36 [2020-09-21 10:21:27,408 INFO L226 Difference]: Without dead ends: 24 [2020-09-21 10:21:27,408 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 [2020-09-21 10:21:27,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-09-21 10:21:27,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-09-21 10:21:27,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-09-21 10:21:27,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-09-21 10:21:27,415 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-09-21 10:21:27,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:27,415 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-09-21 10:21:27,415 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 10:21:27,416 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-09-21 10:21:27,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-09-21 10:21:27,416 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:27,417 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] [2020-09-21 10:21:27,417 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-21 10:21:27,417 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:27,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:27,418 INFO L82 PathProgramCache]: Analyzing trace with hash 1739404943, now seen corresponding path program 2 times [2020-09-21 10:21:27,418 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:27,418 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [705605148] [2020-09-21 10:21:27,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:27,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:27,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:27,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:27,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-09-21 10:21:27,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:27,515 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:27,515 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [705605148] [2020-09-21 10:21:27,516 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:27,516 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-09-21 10:21:27,516 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642031548] [2020-09-21 10:21:27,516 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-21 10:21:27,517 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:27,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-21 10:21:27,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:21:27,518 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 6 states. [2020-09-21 10:21:27,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:27,587 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-09-21 10:21:27,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-21 10:21:27,587 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-09-21 10:21:27,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:27,588 INFO L225 Difference]: With dead ends: 38 [2020-09-21 10:21:27,588 INFO L226 Difference]: Without dead ends: 26 [2020-09-21 10:21:27,589 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 [2020-09-21 10:21:27,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-09-21 10:21:27,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-09-21 10:21:27,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-09-21 10:21:27,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-09-21 10:21:27,595 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-09-21 10:21:27,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:27,595 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-09-21 10:21:27,595 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-21 10:21:27,596 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-09-21 10:21:27,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-09-21 10:21:27,596 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:27,597 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] [2020-09-21 10:21:27,597 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-21 10:21:27,597 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:27,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:27,598 INFO L82 PathProgramCache]: Analyzing trace with hash -1328015311, now seen corresponding path program 3 times [2020-09-21 10:21:27,598 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:27,598 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [931094906] [2020-09-21 10:21:27,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:27,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:27,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:27,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:27,707 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-09-21 10:21:27,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:27,715 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:27,715 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [931094906] [2020-09-21 10:21:27,715 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:27,716 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-21 10:21:27,716 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1773892475] [2020-09-21 10:21:27,716 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-21 10:21:27,717 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:27,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-21 10:21:27,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-09-21 10:21:27,717 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 7 states. [2020-09-21 10:21:27,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:27,788 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-09-21 10:21:27,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-21 10:21:27,789 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-09-21 10:21:27,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:27,790 INFO L225 Difference]: With dead ends: 40 [2020-09-21 10:21:27,790 INFO L226 Difference]: Without dead ends: 28 [2020-09-21 10:21:27,791 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 [2020-09-21 10:21:27,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-09-21 10:21:27,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-09-21 10:21:27,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-09-21 10:21:27,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-09-21 10:21:27,797 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-09-21 10:21:27,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:27,798 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-09-21 10:21:27,798 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-21 10:21:27,798 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-09-21 10:21:27,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-09-21 10:21:27,799 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:27,799 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] [2020-09-21 10:21:27,799 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-21 10:21:27,800 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:27,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:27,800 INFO L82 PathProgramCache]: Analyzing trace with hash 1523652947, now seen corresponding path program 4 times [2020-09-21 10:21:27,800 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:27,801 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [229392605] [2020-09-21 10:21:27,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:27,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:27,958 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:27,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:27,967 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-09-21 10:21:27,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:27,976 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:27,976 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [229392605] [2020-09-21 10:21:27,977 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:27,977 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-21 10:21:27,977 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529890434] [2020-09-21 10:21:27,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-21 10:21:27,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:27,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-21 10:21:27,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-09-21 10:21:27,979 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2020-09-21 10:21:28,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:28,045 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-09-21 10:21:28,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-21 10:21:28,045 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-09-21 10:21:28,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:28,046 INFO L225 Difference]: With dead ends: 42 [2020-09-21 10:21:28,047 INFO L226 Difference]: Without dead ends: 30 [2020-09-21 10:21:28,047 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 [2020-09-21 10:21:28,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-09-21 10:21:28,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-09-21 10:21:28,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-09-21 10:21:28,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-09-21 10:21:28,053 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-09-21 10:21:28,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:28,054 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-09-21 10:21:28,054 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-21 10:21:28,054 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-09-21 10:21:28,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-09-21 10:21:28,055 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:28,055 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] [2020-09-21 10:21:28,055 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-21 10:21:28,056 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:28,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:28,056 INFO L82 PathProgramCache]: Analyzing trace with hash 1787714037, now seen corresponding path program 5 times [2020-09-21 10:21:28,056 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:28,057 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1153013676] [2020-09-21 10:21:28,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:28,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:28,157 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:28,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:28,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-09-21 10:21:28,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:28,182 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:28,182 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1153013676] [2020-09-21 10:21:28,183 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:28,183 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-21 10:21:28,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897773243] [2020-09-21 10:21:28,184 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-21 10:21:28,184 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:28,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-21 10:21:28,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-09-21 10:21:28,185 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-09-21 10:21:28,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:28,269 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-09-21 10:21:28,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-21 10:21:28,269 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-09-21 10:21:28,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:28,270 INFO L225 Difference]: With dead ends: 44 [2020-09-21 10:21:28,271 INFO L226 Difference]: Without dead ends: 32 [2020-09-21 10:21:28,271 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 [2020-09-21 10:21:28,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-09-21 10:21:28,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-09-21 10:21:28,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-09-21 10:21:28,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-09-21 10:21:28,277 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-09-21 10:21:28,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:28,278 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-09-21 10:21:28,278 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-21 10:21:28,278 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-09-21 10:21:28,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-09-21 10:21:28,279 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:28,279 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] [2020-09-21 10:21:28,280 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-21 10:21:28,280 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:28,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:28,280 INFO L82 PathProgramCache]: Analyzing trace with hash 2147351063, now seen corresponding path program 6 times [2020-09-21 10:21:28,281 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:28,281 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [747358347] [2020-09-21 10:21:28,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:28,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:28,391 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:28,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:28,395 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-09-21 10:21:28,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:28,401 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:28,401 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [747358347] [2020-09-21 10:21:28,402 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:28,402 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-21 10:21:28,402 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593655358] [2020-09-21 10:21:28,403 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-21 10:21:28,403 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:28,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-21 10:21:28,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:21:28,404 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2020-09-21 10:21:28,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:28,481 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-09-21 10:21:28,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-21 10:21:28,481 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-09-21 10:21:28,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:28,482 INFO L225 Difference]: With dead ends: 46 [2020-09-21 10:21:28,482 INFO L226 Difference]: Without dead ends: 34 [2020-09-21 10:21:28,483 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 [2020-09-21 10:21:28,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-09-21 10:21:28,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-09-21 10:21:28,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-09-21 10:21:28,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-09-21 10:21:28,489 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-09-21 10:21:28,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:28,489 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-09-21 10:21:28,489 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-21 10:21:28,490 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-09-21 10:21:28,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-09-21 10:21:28,490 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:28,491 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] [2020-09-21 10:21:28,491 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-21 10:21:28,491 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:28,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:28,492 INFO L82 PathProgramCache]: Analyzing trace with hash -133817927, now seen corresponding path program 7 times [2020-09-21 10:21:28,492 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:28,492 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1257162642] [2020-09-21 10:21:28,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:28,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:28,613 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:28,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:28,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-09-21 10:21:28,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:28,623 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:28,623 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1257162642] [2020-09-21 10:21:28,623 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:28,624 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-09-21 10:21:28,624 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982305539] [2020-09-21 10:21:28,624 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-09-21 10:21:28,625 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:28,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-09-21 10:21:28,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-09-21 10:21:28,625 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-09-21 10:21:28,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:28,708 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-09-21 10:21:28,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-09-21 10:21:28,709 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-09-21 10:21:28,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:28,710 INFO L225 Difference]: With dead ends: 48 [2020-09-21 10:21:28,710 INFO L226 Difference]: Without dead ends: 36 [2020-09-21 10:21:28,711 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 [2020-09-21 10:21:28,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-09-21 10:21:28,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-09-21 10:21:28,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-09-21 10:21:28,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-09-21 10:21:28,716 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-09-21 10:21:28,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:28,717 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-09-21 10:21:28,717 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-09-21 10:21:28,717 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-09-21 10:21:28,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-09-21 10:21:28,718 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:28,718 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] [2020-09-21 10:21:28,718 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-09-21 10:21:28,719 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:28,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:28,719 INFO L82 PathProgramCache]: Analyzing trace with hash -1903896357, now seen corresponding path program 8 times [2020-09-21 10:21:28,719 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:28,720 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1657245008] [2020-09-21 10:21:28,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:28,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:28,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:28,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:28,891 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-09-21 10:21:28,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:28,897 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:28,897 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1657245008] [2020-09-21 10:21:28,898 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:28,898 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-09-21 10:21:28,898 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067341942] [2020-09-21 10:21:28,898 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-09-21 10:21:28,899 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:28,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-09-21 10:21:28,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-09-21 10:21:28,899 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 12 states. [2020-09-21 10:21:28,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:28,972 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-09-21 10:21:28,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-21 10:21:28,973 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-09-21 10:21:28,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:28,974 INFO L225 Difference]: With dead ends: 50 [2020-09-21 10:21:28,974 INFO L226 Difference]: Without dead ends: 38 [2020-09-21 10:21:28,974 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 [2020-09-21 10:21:28,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-09-21 10:21:28,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-09-21 10:21:28,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-09-21 10:21:28,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-09-21 10:21:28,980 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-09-21 10:21:28,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:28,980 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-09-21 10:21:28,980 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-09-21 10:21:28,981 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-09-21 10:21:28,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-09-21 10:21:28,981 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:28,981 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] [2020-09-21 10:21:28,982 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-09-21 10:21:28,982 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:28,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:28,982 INFO L82 PathProgramCache]: Analyzing trace with hash -2142218371, now seen corresponding path program 9 times [2020-09-21 10:21:28,983 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:28,983 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1544143535] [2020-09-21 10:21:28,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:29,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:29,126 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:29,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:29,130 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-09-21 10:21:29,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:29,134 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:29,135 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1544143535] [2020-09-21 10:21:29,135 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:29,135 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-09-21 10:21:29,135 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1821653874] [2020-09-21 10:21:29,136 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-21 10:21:29,136 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:29,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-21 10:21:29,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-09-21 10:21:29,137 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 13 states. [2020-09-21 10:21:29,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:29,246 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2020-09-21 10:21:29,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-09-21 10:21:29,247 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-09-21 10:21:29,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:29,248 INFO L225 Difference]: With dead ends: 52 [2020-09-21 10:21:29,248 INFO L226 Difference]: Without dead ends: 40 [2020-09-21 10:21:29,249 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 [2020-09-21 10:21:29,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-09-21 10:21:29,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-09-21 10:21:29,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-09-21 10:21:29,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-09-21 10:21:29,258 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-09-21 10:21:29,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:29,260 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-09-21 10:21:29,260 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-21 10:21:29,260 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-09-21 10:21:29,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-09-21 10:21:29,261 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:29,262 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] [2020-09-21 10:21:29,262 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-09-21 10:21:29,262 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:29,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:29,262 INFO L82 PathProgramCache]: Analyzing trace with hash 758560159, now seen corresponding path program 10 times [2020-09-21 10:21:29,263 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:29,263 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1496176393] [2020-09-21 10:21:29,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:29,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:29,467 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:29,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:29,475 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-09-21 10:21:29,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:29,485 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:29,485 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1496176393] [2020-09-21 10:21:29,486 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:29,486 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-09-21 10:21:29,486 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459034298] [2020-09-21 10:21:29,487 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-09-21 10:21:29,487 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:29,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-09-21 10:21:29,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-09-21 10:21:29,488 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 14 states. [2020-09-21 10:21:29,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:29,585 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2020-09-21 10:21:29,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-09-21 10:21:29,587 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 38 [2020-09-21 10:21:29,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:29,588 INFO L225 Difference]: With dead ends: 54 [2020-09-21 10:21:29,588 INFO L226 Difference]: Without dead ends: 42 [2020-09-21 10:21:29,589 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-09-21 10:21:29,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-09-21 10:21:29,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-09-21 10:21:29,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-09-21 10:21:29,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-09-21 10:21:29,598 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-09-21 10:21:29,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:29,598 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-09-21 10:21:29,598 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-09-21 10:21:29,598 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-09-21 10:21:29,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-09-21 10:21:29,599 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:29,599 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:21:29,600 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-09-21 10:21:29,602 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:29,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:29,603 INFO L82 PathProgramCache]: Analyzing trace with hash 972952385, now seen corresponding path program 11 times [2020-09-21 10:21:29,603 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:29,603 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [279068000] [2020-09-21 10:21:29,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:29,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:29,782 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:29,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:29,785 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-09-21 10:21:29,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:29,790 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:29,790 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [279068000] [2020-09-21 10:21:29,790 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:29,791 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-09-21 10:21:29,791 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662051331] [2020-09-21 10:21:29,791 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-09-21 10:21:29,792 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:29,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-09-21 10:21:29,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-09-21 10:21:29,792 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 15 states. [2020-09-21 10:21:29,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:29,885 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2020-09-21 10:21:29,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-09-21 10:21:29,885 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 40 [2020-09-21 10:21:29,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:29,886 INFO L225 Difference]: With dead ends: 56 [2020-09-21 10:21:29,886 INFO L226 Difference]: Without dead ends: 44 [2020-09-21 10:21:29,887 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-09-21 10:21:29,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-09-21 10:21:29,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-09-21 10:21:29,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-09-21 10:21:29,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-09-21 10:21:29,892 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-09-21 10:21:29,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:29,892 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-09-21 10:21:29,893 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-09-21 10:21:29,893 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-09-21 10:21:29,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-09-21 10:21:29,893 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:29,894 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:21:29,894 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-09-21 10:21:29,894 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:29,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:29,894 INFO L82 PathProgramCache]: Analyzing trace with hash 845451363, now seen corresponding path program 12 times [2020-09-21 10:21:29,895 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:29,895 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1620413636] [2020-09-21 10:21:29,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:29,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:30,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:30,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:30,084 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2020-09-21 10:21:30,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:30,089 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:30,089 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1620413636] [2020-09-21 10:21:30,090 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:30,090 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-09-21 10:21:30,090 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964240961] [2020-09-21 10:21:30,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-09-21 10:21:30,091 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:30,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-09-21 10:21:30,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-09-21 10:21:30,091 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 16 states. [2020-09-21 10:21:30,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:30,176 INFO L93 Difference]: Finished difference Result 58 states and 60 transitions. [2020-09-21 10:21:30,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-09-21 10:21:30,177 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 42 [2020-09-21 10:21:30,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:30,178 INFO L225 Difference]: With dead ends: 58 [2020-09-21 10:21:30,178 INFO L226 Difference]: Without dead ends: 46 [2020-09-21 10:21:30,179 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-09-21 10:21:30,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-09-21 10:21:30,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-09-21 10:21:30,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-09-21 10:21:30,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-09-21 10:21:30,191 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 42 [2020-09-21 10:21:30,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:30,192 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-09-21 10:21:30,192 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-09-21 10:21:30,192 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-09-21 10:21:30,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-09-21 10:21:30,193 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:30,193 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:21:30,195 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-09-21 10:21:30,195 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:30,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:30,196 INFO L82 PathProgramCache]: Analyzing trace with hash -1423946491, now seen corresponding path program 13 times [2020-09-21 10:21:30,196 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:30,196 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1034038429] [2020-09-21 10:21:30,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:30,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:30,436 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:30,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:30,440 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-09-21 10:21:30,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:30,445 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:30,445 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1034038429] [2020-09-21 10:21:30,446 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:30,446 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-09-21 10:21:30,446 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [58729784] [2020-09-21 10:21:30,447 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-09-21 10:21:30,447 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:30,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-09-21 10:21:30,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-09-21 10:21:30,448 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 17 states. [2020-09-21 10:21:30,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:30,577 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2020-09-21 10:21:30,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-09-21 10:21:30,578 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 44 [2020-09-21 10:21:30,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:30,579 INFO L225 Difference]: With dead ends: 60 [2020-09-21 10:21:30,579 INFO L226 Difference]: Without dead ends: 48 [2020-09-21 10:21:30,580 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-09-21 10:21:30,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-09-21 10:21:30,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-09-21 10:21:30,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-09-21 10:21:30,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2020-09-21 10:21:30,585 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 44 [2020-09-21 10:21:30,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:30,585 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2020-09-21 10:21:30,585 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-09-21 10:21:30,585 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2020-09-21 10:21:30,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-09-21 10:21:30,586 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:30,586 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:21:30,586 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-09-21 10:21:30,587 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:30,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:30,587 INFO L82 PathProgramCache]: Analyzing trace with hash -471897817, now seen corresponding path program 14 times [2020-09-21 10:21:30,587 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:30,588 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [687670812] [2020-09-21 10:21:30,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:30,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:30,808 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:30,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:30,811 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2020-09-21 10:21:30,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:30,818 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:30,819 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [687670812] [2020-09-21 10:21:30,819 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:30,819 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-09-21 10:21:30,819 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729031261] [2020-09-21 10:21:30,820 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-09-21 10:21:30,820 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:30,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-09-21 10:21:30,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-09-21 10:21:30,821 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 18 states. [2020-09-21 10:21:30,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:30,928 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2020-09-21 10:21:30,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-09-21 10:21:30,929 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 46 [2020-09-21 10:21:30,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:30,930 INFO L225 Difference]: With dead ends: 62 [2020-09-21 10:21:30,930 INFO L226 Difference]: Without dead ends: 50 [2020-09-21 10:21:30,931 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-09-21 10:21:30,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-09-21 10:21:30,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-09-21 10:21:30,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-09-21 10:21:30,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2020-09-21 10:21:30,935 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 46 [2020-09-21 10:21:30,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:30,936 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2020-09-21 10:21:30,936 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-09-21 10:21:30,936 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2020-09-21 10:21:30,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-09-21 10:21:30,937 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:30,937 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:21:30,937 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-09-21 10:21:30,937 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:30,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:30,938 INFO L82 PathProgramCache]: Analyzing trace with hash -381156151, now seen corresponding path program 15 times [2020-09-21 10:21:30,938 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:30,938 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1636315539] [2020-09-21 10:21:30,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:30,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:31,190 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:31,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:31,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2020-09-21 10:21:31,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:31,199 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:31,200 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1636315539] [2020-09-21 10:21:31,200 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:31,200 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-09-21 10:21:31,200 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79854264] [2020-09-21 10:21:31,201 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-09-21 10:21:31,201 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:31,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-09-21 10:21:31,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-09-21 10:21:31,202 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 19 states. [2020-09-21 10:21:31,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:31,327 INFO L93 Difference]: Finished difference Result 64 states and 66 transitions. [2020-09-21 10:21:31,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-09-21 10:21:31,328 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 48 [2020-09-21 10:21:31,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:31,328 INFO L225 Difference]: With dead ends: 64 [2020-09-21 10:21:31,328 INFO L226 Difference]: Without dead ends: 52 [2020-09-21 10:21:31,329 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-09-21 10:21:31,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-09-21 10:21:31,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-09-21 10:21:31,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-09-21 10:21:31,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2020-09-21 10:21:31,334 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 48 [2020-09-21 10:21:31,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:31,335 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2020-09-21 10:21:31,335 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-09-21 10:21:31,335 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2020-09-21 10:21:31,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-09-21 10:21:31,336 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:31,336 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:21:31,336 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-09-21 10:21:31,336 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:31,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:31,337 INFO L82 PathProgramCache]: Analyzing trace with hash 922238955, now seen corresponding path program 16 times [2020-09-21 10:21:31,337 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:31,337 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1029441478] [2020-09-21 10:21:31,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:31,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:31,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:31,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:31,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2020-09-21 10:21:31,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:31,605 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:31,606 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1029441478] [2020-09-21 10:21:31,606 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:31,606 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-09-21 10:21:31,606 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016547054] [2020-09-21 10:21:31,607 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-09-21 10:21:31,607 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:31,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-09-21 10:21:31,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-09-21 10:21:31,608 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 20 states. [2020-09-21 10:21:31,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:31,716 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2020-09-21 10:21:31,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-09-21 10:21:31,717 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 50 [2020-09-21 10:21:31,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:31,718 INFO L225 Difference]: With dead ends: 66 [2020-09-21 10:21:31,718 INFO L226 Difference]: Without dead ends: 54 [2020-09-21 10:21:31,719 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-09-21 10:21:31,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-09-21 10:21:31,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-09-21 10:21:31,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-09-21 10:21:31,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2020-09-21 10:21:31,728 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 50 [2020-09-21 10:21:31,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:31,728 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2020-09-21 10:21:31,728 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-09-21 10:21:31,728 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2020-09-21 10:21:31,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-09-21 10:21:31,729 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:31,729 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:21:31,729 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-09-21 10:21:31,730 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:31,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:31,730 INFO L82 PathProgramCache]: Analyzing trace with hash -645514611, now seen corresponding path program 17 times [2020-09-21 10:21:31,730 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:31,731 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1992736776] [2020-09-21 10:21:31,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:31,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:32,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:32,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:32,044 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2020-09-21 10:21:32,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:32,051 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:32,052 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1992736776] [2020-09-21 10:21:32,052 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:32,052 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-09-21 10:21:32,053 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1228966716] [2020-09-21 10:21:32,053 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-09-21 10:21:32,054 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:32,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-09-21 10:21:32,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-09-21 10:21:32,055 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand 21 states. [2020-09-21 10:21:32,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:32,189 INFO L93 Difference]: Finished difference Result 68 states and 70 transitions. [2020-09-21 10:21:32,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-09-21 10:21:32,190 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 52 [2020-09-21 10:21:32,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:32,191 INFO L225 Difference]: With dead ends: 68 [2020-09-21 10:21:32,191 INFO L226 Difference]: Without dead ends: 56 [2020-09-21 10:21:32,192 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-09-21 10:21:32,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-09-21 10:21:32,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-09-21 10:21:32,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-09-21 10:21:32,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2020-09-21 10:21:32,196 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 52 [2020-09-21 10:21:32,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:32,196 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2020-09-21 10:21:32,197 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-09-21 10:21:32,197 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2020-09-21 10:21:32,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-09-21 10:21:32,197 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:32,197 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:21:32,198 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-09-21 10:21:32,198 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:32,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:32,198 INFO L82 PathProgramCache]: Analyzing trace with hash 276829359, now seen corresponding path program 18 times [2020-09-21 10:21:32,199 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:32,199 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [611322498] [2020-09-21 10:21:32,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:32,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:32,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:32,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:32,510 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2020-09-21 10:21:32,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:32,516 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:32,517 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [611322498] [2020-09-21 10:21:32,517 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:32,517 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-09-21 10:21:32,517 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [926757948] [2020-09-21 10:21:32,518 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-09-21 10:21:32,518 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:32,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-09-21 10:21:32,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-09-21 10:21:32,519 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 22 states. [2020-09-21 10:21:32,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:32,634 INFO L93 Difference]: Finished difference Result 70 states and 72 transitions. [2020-09-21 10:21:32,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-09-21 10:21:32,635 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 54 [2020-09-21 10:21:32,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:32,635 INFO L225 Difference]: With dead ends: 70 [2020-09-21 10:21:32,636 INFO L226 Difference]: Without dead ends: 58 [2020-09-21 10:21:32,636 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-09-21 10:21:32,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-09-21 10:21:32,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-09-21 10:21:32,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-09-21 10:21:32,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-09-21 10:21:32,643 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 54 [2020-09-21 10:21:32,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:32,644 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-09-21 10:21:32,644 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-09-21 10:21:32,645 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-09-21 10:21:32,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-09-21 10:21:32,645 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:32,645 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:21:32,645 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-09-21 10:21:32,646 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:32,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:32,646 INFO L82 PathProgramCache]: Analyzing trace with hash 1886121553, now seen corresponding path program 19 times [2020-09-21 10:21:32,647 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:32,647 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [618810823] [2020-09-21 10:21:32,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:32,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:33,003 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:33,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:33,008 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2020-09-21 10:21:33,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:33,028 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:33,029 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [618810823] [2020-09-21 10:21:33,029 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:33,029 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-09-21 10:21:33,029 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [758345865] [2020-09-21 10:21:33,030 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-09-21 10:21:33,030 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:33,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-09-21 10:21:33,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-09-21 10:21:33,032 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 23 states. [2020-09-21 10:21:33,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:33,191 INFO L93 Difference]: Finished difference Result 71 states and 73 transitions. [2020-09-21 10:21:33,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-09-21 10:21:33,191 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 56 [2020-09-21 10:21:33,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:33,192 INFO L225 Difference]: With dead ends: 71 [2020-09-21 10:21:33,192 INFO L226 Difference]: Without dead ends: 59 [2020-09-21 10:21:33,193 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-09-21 10:21:33,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-09-21 10:21:33,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-09-21 10:21:33,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-09-21 10:21:33,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2020-09-21 10:21:33,199 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 56 [2020-09-21 10:21:33,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:33,200 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2020-09-21 10:21:33,200 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-09-21 10:21:33,200 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2020-09-21 10:21:33,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-09-21 10:21:33,201 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:33,201 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:21:33,201 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-09-21 10:21:33,201 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:33,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:33,202 INFO L82 PathProgramCache]: Analyzing trace with hash -2067273869, now seen corresponding path program 20 times [2020-09-21 10:21:33,205 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:33,205 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1686784166] [2020-09-21 10:21:33,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:33,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-21 10:21:33,343 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-21 10:21:33,344 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-21 10:21:33,352 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-09-21 10:21:33,395 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.09 10:21:33 BoogieIcfgContainer [2020-09-21 10:21:33,395 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-21 10:21:33,405 INFO L168 Benchmark]: Toolchain (without parser) took 7850.41 ms. Allocated memory was 108.5 MB in the beginning and 263.7 MB in the end (delta: 155.2 MB). Free memory was 73.9 MB in the beginning and 204.5 MB in the end (delta: -130.6 MB). Peak memory consumption was 24.6 MB. Max. memory is 7.1 GB. [2020-09-21 10:21:33,407 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 108.5 MB. Free memory was 91.2 MB in the beginning and 91.1 MB in the end (delta: 105.1 kB). Peak memory consumption was 105.1 kB. Max. memory is 7.1 GB. [2020-09-21 10:21:33,410 INFO L168 Benchmark]: CACSL2BoogieTranslator took 398.82 ms. Allocated memory was 108.5 MB in the beginning and 122.7 MB in the end (delta: 14.2 MB). Free memory was 73.3 MB in the beginning and 98.9 MB in the end (delta: -25.6 MB). Peak memory consumption was 17.9 MB. Max. memory is 7.1 GB. [2020-09-21 10:21:33,411 INFO L168 Benchmark]: Boogie Preprocessor took 118.43 ms. Allocated memory was 122.7 MB in the beginning and 161.0 MB in the end (delta: 38.3 MB). Free memory was 98.9 MB in the beginning and 146.0 MB in the end (delta: -47.1 MB). Peak memory consumption was 74.7 kB. Max. memory is 7.1 GB. [2020-09-21 10:21:33,411 INFO L168 Benchmark]: RCFGBuilder took 426.35 ms. Allocated memory is still 161.0 MB. Free memory was 146.0 MB in the beginning and 131.2 MB in the end (delta: 14.8 MB). Peak memory consumption was 14.8 MB. Max. memory is 7.1 GB. [2020-09-21 10:21:33,411 INFO L168 Benchmark]: TraceAbstraction took 6896.97 ms. Allocated memory was 161.0 MB in the beginning and 263.7 MB in the end (delta: 102.8 MB). Free memory was 130.2 MB in the beginning and 204.5 MB in the end (delta: -74.2 MB). Peak memory consumption was 28.5 MB. Max. memory is 7.1 GB. [2020-09-21 10:21:33,416 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 108.5 MB. Free memory was 91.2 MB in the beginning and 91.1 MB in the end (delta: 105.1 kB). Peak memory consumption was 105.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 398.82 ms. Allocated memory was 108.5 MB in the beginning and 122.7 MB in the end (delta: 14.2 MB). Free memory was 73.3 MB in the beginning and 98.9 MB in the end (delta: -25.6 MB). Peak memory consumption was 17.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 118.43 ms. Allocated memory was 122.7 MB in the beginning and 161.0 MB in the end (delta: 38.3 MB). Free memory was 98.9 MB in the beginning and 146.0 MB in the end (delta: -47.1 MB). Peak memory consumption was 74.7 kB. Max. memory is 7.1 GB. * RCFGBuilder took 426.35 ms. Allocated memory is still 161.0 MB. Free memory was 146.0 MB in the beginning and 131.2 MB in the end (delta: 14.8 MB). Peak memory consumption was 14.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 6896.97 ms. Allocated memory was 161.0 MB in the beginning and 263.7 MB in the end (delta: 102.8 MB). Free memory was 130.2 MB in the beginning and 204.5 MB in the end (delta: -74.2 MB). Peak memory consumption was 28.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 37]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L15] struct dummy ad1[20], *ad2; [L16] int i, j, *pa; [L17] j=0 [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND FALSE !(j<20) [L21] i = __VERIFIER_nondet_int() [L22] COND TRUE i >= 0 && i < 10 [L23] ad2 = ad1 [L24] ad1[i].a = i [L25] pa = &ad1[i].a [L26] EXPR ad2[i].a [L26] i = ad2[i].a + 10 [L27] EXPR \read(*pa) [L27] COND FALSE !(i < *pa) [L30] CALL, EXPR check(ad1, i) [L10] EXPR ad1[b].a [L10] return ad1[b].a == b; [L30] RET, EXPR check(ad1, i) [L30] COND TRUE !check(ad1, i) [L37] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 6.7s, OverallIterations: 22, TraceHistogramMax: 20, AutomataDifference: 2.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 365 SDtfs, 252 SDslu, 1934 SDs, 0 SdLazy, 1339 SolverSat, 72 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 336 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 231 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 2.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=59occurred in iteration=21, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 21 MinimizatonAttempts, 19 StatesRemovedByMinimization, 19 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.6s SatisfiabilityAnalysisTime, 3.4s InterpolantComputationTime, 815 NumberOfCodeBlocks, 815 NumberOfCodeBlocksAsserted, 22 NumberOfCheckSat, 736 ConstructedInterpolants, 0 QuantifiedInterpolants, 69580 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 21 InterpolantComputations, 2 PerfectInterpolantSequences, 0/2470 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...