/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/string-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 15:51:00,898 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 15:51:00,901 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 15:51:00,945 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 15:51:00,945 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 15:51:00,958 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 15:51:00,960 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 15:51:00,962 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 15:51:00,966 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 15:51:00,967 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 15:51:00,969 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 15:51:00,972 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 15:51:00,972 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 15:51:00,976 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 15:51:00,977 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 15:51:00,978 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 15:51:00,979 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 15:51:00,979 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 15:51:00,981 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 15:51:00,983 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 15:51:00,984 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 15:51:00,985 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 15:51:00,986 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 15:51:00,987 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 15:51:00,989 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 15:51:00,989 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 15:51:00,990 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 15:51:00,991 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 15:51:00,991 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 15:51:00,992 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-21 15:51:00,997 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 15:51:00,997 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 15:51:00,998 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 15:51:00,999 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 15:51:01,021 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 15:51:01,021 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 15:51:01,022 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 15:51:01,023 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 15:51:01,023 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 15:51:01,023 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 15:51:01,023 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 15:51:01,024 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 15:51:01,024 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 15:51:01,024 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 15:51:01,024 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 15:51:01,024 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 15:51:01,024 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 15:51:01,025 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 15:51:01,025 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 15:51:01,025 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 15:51:01,025 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 15:51:01,025 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 15:51:01,026 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 15:51:01,026 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 15:51:01,026 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 15:51:01,026 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 15:51:01,027 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 15:51:01,027 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 15:51:01,027 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 15:51:01,027 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 15:51:01,027 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 15:51:01,027 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 15:51:01,028 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 15:51:01,028 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; [2020-08-21 15:51:01,312 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 15:51:01,324 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 15:51:01,328 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 15:51:01,330 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 15:51:01,330 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 15:51:01,331 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-1.i [2020-08-21 15:51:01,397 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/490c47e58/3fa29f83c8bb40be8cb7bb14b099cfcc/FLAG1cf62770a [2020-08-21 15:51:01,863 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 15:51:01,864 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/string-1.i [2020-08-21 15:51:01,871 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/490c47e58/3fa29f83c8bb40be8cb7bb14b099cfcc/FLAG1cf62770a [2020-08-21 15:51:02,258 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/490c47e58/3fa29f83c8bb40be8cb7bb14b099cfcc [2020-08-21 15:51:02,266 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 15:51:02,267 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 15:51:02,268 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 15:51:02,268 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 15:51:02,272 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 15:51:02,273 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:51:02" (1/1) ... [2020-08-21 15:51:02,276 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3b9047b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:02, skipping insertion in model container [2020-08-21 15:51:02,276 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:51:02" (1/1) ... [2020-08-21 15:51:02,284 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 15:51:02,302 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 15:51:02,517 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:51:02,521 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 15:51:02,544 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:51:02,637 INFO L208 MainTranslator]: Completed translation [2020-08-21 15:51:02,638 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:02 WrapperNode [2020-08-21 15:51:02,638 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 15:51:02,639 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 15:51:02,639 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 15:51:02,639 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 15:51:02,653 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:02" (1/1) ... [2020-08-21 15:51:02,653 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:02" (1/1) ... [2020-08-21 15:51:02,662 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:02" (1/1) ... [2020-08-21 15:51:02,663 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:02" (1/1) ... [2020-08-21 15:51:02,671 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:02" (1/1) ... [2020-08-21 15:51:02,678 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:02" (1/1) ... [2020-08-21 15:51:02,680 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:02" (1/1) ... [2020-08-21 15:51:02,682 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 15:51:02,683 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 15:51:02,683 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 15:51:02,683 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 15:51:02,684 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:02" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 15:51:02,752 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 15:51:02,752 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 15:51:02,752 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 15:51:02,752 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 15:51:02,752 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 15:51:02,752 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 15:51:02,753 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 15:51:02,753 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 15:51:02,753 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 15:51:02,753 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-21 15:51:02,753 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 15:51:02,753 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 15:51:02,754 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 15:51:02,754 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 15:51:02,754 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 15:51:02,754 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 15:51:02,754 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 15:51:03,073 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 15:51:03,074 INFO L295 CfgBuilder]: Removed 5 assume(true) statements. [2020-08-21 15:51:03,080 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:51:03 BoogieIcfgContainer [2020-08-21 15:51:03,081 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 15:51:03,082 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 15:51:03,082 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 15:51:03,086 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 15:51:03,086 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 03:51:02" (1/3) ... [2020-08-21 15:51:03,087 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f41e840 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:51:03, skipping insertion in model container [2020-08-21 15:51:03,087 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:02" (2/3) ... [2020-08-21 15:51:03,087 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f41e840 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:51:03, skipping insertion in model container [2020-08-21 15:51:03,088 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:51:03" (3/3) ... [2020-08-21 15:51:03,089 INFO L109 eAbstractionObserver]: Analyzing ICFG string-1.i [2020-08-21 15:51:03,103 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 15:51:03,112 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 15:51:03,137 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 15:51:03,201 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 15:51:03,202 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 15:51:03,202 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 15:51:03,202 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 15:51:03,202 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 15:51:03,202 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 15:51:03,203 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 15:51:03,206 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 15:51:03,226 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2020-08-21 15:51:03,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 15:51:03,232 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:03,233 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, 1, 1] [2020-08-21 15:51:03,234 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:03,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:03,239 INFO L82 PathProgramCache]: Analyzing trace with hash -522531256, now seen corresponding path program 1 times [2020-08-21 15:51:03,247 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:03,248 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [262755798] [2020-08-21 15:51:03,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:03,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:03,444 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:03,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:03,459 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:03,460 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [262755798] [2020-08-21 15:51:03,463 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:51:03,463 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 15:51:03,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043496860] [2020-08-21 15:51:03,470 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 15:51:03,470 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:03,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 15:51:03,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 15:51:03,489 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 4 states. [2020-08-21 15:51:03,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:03,696 INFO L93 Difference]: Finished difference Result 73 states and 109 transitions. [2020-08-21 15:51:03,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 15:51:03,698 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 22 [2020-08-21 15:51:03,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:03,710 INFO L225 Difference]: With dead ends: 73 [2020-08-21 15:51:03,710 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 15:51:03,714 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 15:51:03,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 15:51:03,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2020-08-21 15:51:03,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 15:51:03,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2020-08-21 15:51:03,763 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 22 [2020-08-21 15:51:03,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:03,764 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2020-08-21 15:51:03,764 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 15:51:03,764 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2020-08-21 15:51:03,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 15:51:03,765 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:03,765 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, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:03,766 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 15:51:03,766 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:03,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:03,767 INFO L82 PathProgramCache]: Analyzing trace with hash -1816798436, now seen corresponding path program 1 times [2020-08-21 15:51:03,767 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:03,768 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [618625091] [2020-08-21 15:51:03,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:03,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:03,867 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:03,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:03,887 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 15:51:03,887 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [618625091] [2020-08-21 15:51:03,887 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:03,888 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 15:51:03,888 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2017772658] [2020-08-21 15:51:03,895 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 15:51:03,895 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:03,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 15:51:03,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:51:03,896 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 5 states. [2020-08-21 15:51:04,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:04,054 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2020-08-21 15:51:04,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 15:51:04,055 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 28 [2020-08-21 15:51:04,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:04,056 INFO L225 Difference]: With dead ends: 65 [2020-08-21 15:51:04,057 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 15:51:04,058 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:51:04,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 15:51:04,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 34. [2020-08-21 15:51:04,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 15:51:04,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2020-08-21 15:51:04,067 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 28 [2020-08-21 15:51:04,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:04,067 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2020-08-21 15:51:04,068 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 15:51:04,068 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2020-08-21 15:51:04,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 15:51:04,072 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:04,073 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:04,073 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 15:51:04,074 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:04,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:04,074 INFO L82 PathProgramCache]: Analyzing trace with hash 1067646812, now seen corresponding path program 2 times [2020-08-21 15:51:04,075 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:04,075 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1156032740] [2020-08-21 15:51:04,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:04,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:04,188 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:04,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:04,196 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-08-21 15:51:04,196 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1156032740] [2020-08-21 15:51:04,197 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:04,197 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 15:51:04,197 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392779167] [2020-08-21 15:51:04,198 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 15:51:04,198 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:04,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 15:51:04,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 15:51:04,199 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 6 states. [2020-08-21 15:51:04,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:04,369 INFO L93 Difference]: Finished difference Result 75 states and 92 transitions. [2020-08-21 15:51:04,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 15:51:04,370 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 32 [2020-08-21 15:51:04,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:04,371 INFO L225 Difference]: With dead ends: 75 [2020-08-21 15:51:04,371 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 15:51:04,373 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 15:51:04,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 15:51:04,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 38. [2020-08-21 15:51:04,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 15:51:04,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2020-08-21 15:51:04,381 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 32 [2020-08-21 15:51:04,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:04,381 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2020-08-21 15:51:04,382 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 15:51:04,382 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2020-08-21 15:51:04,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 15:51:04,383 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:04,383 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:04,384 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 15:51:04,384 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:04,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:04,384 INFO L82 PathProgramCache]: Analyzing trace with hash -1245957476, now seen corresponding path program 3 times [2020-08-21 15:51:04,385 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:04,385 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [375781630] [2020-08-21 15:51:04,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:04,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:04,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:04,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:04,462 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-08-21 15:51:04,462 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [375781630] [2020-08-21 15:51:04,463 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:04,463 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 15:51:04,463 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677552709] [2020-08-21 15:51:04,464 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 15:51:04,464 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:04,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 15:51:04,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 15:51:04,465 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand 7 states. [2020-08-21 15:51:04,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:04,629 INFO L93 Difference]: Finished difference Result 85 states and 104 transitions. [2020-08-21 15:51:04,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 15:51:04,632 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 36 [2020-08-21 15:51:04,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:04,634 INFO L225 Difference]: With dead ends: 85 [2020-08-21 15:51:04,634 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 15:51:04,636 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 15:51:04,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 15:51:04,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 42. [2020-08-21 15:51:04,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 15:51:04,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2020-08-21 15:51:04,653 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 36 [2020-08-21 15:51:04,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:04,653 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2020-08-21 15:51:04,653 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 15:51:04,654 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2020-08-21 15:51:04,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 15:51:04,656 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:04,656 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:04,656 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 15:51:04,658 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:04,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:04,658 INFO L82 PathProgramCache]: Analyzing trace with hash -1106103076, now seen corresponding path program 4 times [2020-08-21 15:51:04,658 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:04,659 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [403705086] [2020-08-21 15:51:04,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:04,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:04,785 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:04,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:04,792 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-08-21 15:51:04,792 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [403705086] [2020-08-21 15:51:04,792 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:04,793 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 15:51:04,793 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2002704809] [2020-08-21 15:51:04,793 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 15:51:04,794 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:04,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 15:51:04,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 15:51:04,794 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand 8 states. [2020-08-21 15:51:04,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:04,958 INFO L93 Difference]: Finished difference Result 93 states and 114 transitions. [2020-08-21 15:51:04,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 15:51:04,959 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 40 [2020-08-21 15:51:04,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:04,960 INFO L225 Difference]: With dead ends: 93 [2020-08-21 15:51:04,960 INFO L226 Difference]: Without dead ends: 66 [2020-08-21 15:51:04,961 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 15:51:04,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-21 15:51:04,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 46. [2020-08-21 15:51:04,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 15:51:04,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-08-21 15:51:04,968 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 40 [2020-08-21 15:51:04,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:04,969 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-08-21 15:51:04,969 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 15:51:04,969 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-08-21 15:51:04,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 15:51:04,970 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:04,970 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:04,971 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 15:51:04,971 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:04,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:04,971 INFO L82 PathProgramCache]: Analyzing trace with hash 1061537308, now seen corresponding path program 5 times [2020-08-21 15:51:04,972 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:04,972 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2123134344] [2020-08-21 15:51:04,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:05,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:05,133 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:05,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:05,139 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2020-08-21 15:51:05,140 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2123134344] [2020-08-21 15:51:05,140 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:51:05,140 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-08-21 15:51:05,140 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241534765] [2020-08-21 15:51:05,141 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 15:51:05,141 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:05,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 15:51:05,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-21 15:51:05,142 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand 8 states. [2020-08-21 15:51:05,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:05,268 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-21 15:51:05,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 15:51:05,268 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 44 [2020-08-21 15:51:05,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:05,270 INFO L225 Difference]: With dead ends: 62 [2020-08-21 15:51:05,270 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 15:51:05,271 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2020-08-21 15:51:05,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 15:51:05,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-21 15:51:05,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 15:51:05,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2020-08-21 15:51:05,278 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 44 [2020-08-21 15:51:05,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:05,278 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2020-08-21 15:51:05,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 15:51:05,279 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2020-08-21 15:51:05,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 15:51:05,280 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:05,280 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:05,281 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 15:51:05,281 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:05,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:05,281 INFO L82 PathProgramCache]: Analyzing trace with hash -637010121, now seen corresponding path program 1 times [2020-08-21 15:51:05,282 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:05,282 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1864661155] [2020-08-21 15:51:05,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:05,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:05,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:05,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:05,442 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2020-08-21 15:51:05,443 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1864661155] [2020-08-21 15:51:05,443 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:05,444 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 15:51:05,454 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [909159945] [2020-08-21 15:51:05,455 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 15:51:05,455 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:05,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 15:51:05,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-21 15:51:05,456 INFO L87 Difference]: Start difference. First operand 48 states and 53 transitions. Second operand 9 states. [2020-08-21 15:51:05,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:05,635 INFO L93 Difference]: Finished difference Result 55 states and 60 transitions. [2020-08-21 15:51:05,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 15:51:05,635 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 46 [2020-08-21 15:51:05,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:05,637 INFO L225 Difference]: With dead ends: 55 [2020-08-21 15:51:05,637 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 15:51:05,638 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2020-08-21 15:51:05,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 15:51:05,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 15:51:05,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 15:51:05,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-21 15:51:05,654 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 46 [2020-08-21 15:51:05,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:05,654 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-21 15:51:05,655 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 15:51:05,655 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-21 15:51:05,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 15:51:05,659 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:05,659 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:05,659 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 15:51:05,660 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:05,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:05,661 INFO L82 PathProgramCache]: Analyzing trace with hash -1604149734, now seen corresponding path program 1 times [2020-08-21 15:51:05,661 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:05,661 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [373656360] [2020-08-21 15:51:05,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:05,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:05,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:05,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:05,756 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-08-21 15:51:05,757 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [373656360] [2020-08-21 15:51:05,757 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:51:05,757 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 15:51:05,758 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1253739563] [2020-08-21 15:51:05,758 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 15:51:05,759 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:05,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 15:51:05,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:51:05,759 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-21 15:51:05,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:05,821 INFO L93 Difference]: Finished difference Result 67 states and 75 transitions. [2020-08-21 15:51:05,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 15:51:05,821 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 48 [2020-08-21 15:51:05,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:05,823 INFO L225 Difference]: With dead ends: 67 [2020-08-21 15:51:05,823 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 15:51:05,824 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:51:05,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 15:51:05,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-21 15:51:05,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 15:51:05,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 56 transitions. [2020-08-21 15:51:05,842 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 56 transitions. Word has length 48 [2020-08-21 15:51:05,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:05,842 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 56 transitions. [2020-08-21 15:51:05,843 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 15:51:05,843 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 56 transitions. [2020-08-21 15:51:05,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 15:51:05,844 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:05,844 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:05,845 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 15:51:05,846 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:05,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:05,846 INFO L82 PathProgramCache]: Analyzing trace with hash 855134175, now seen corresponding path program 1 times [2020-08-21 15:51:05,846 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:05,847 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1257287194] [2020-08-21 15:51:05,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:05,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:05,944 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:05,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:05,949 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-08-21 15:51:05,950 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1257287194] [2020-08-21 15:51:05,950 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:05,950 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 15:51:05,950 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564014074] [2020-08-21 15:51:05,951 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 15:51:05,951 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:05,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 15:51:05,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-08-21 15:51:05,952 INFO L87 Difference]: Start difference. First operand 51 states and 56 transitions. Second operand 10 states. [2020-08-21 15:51:06,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:06,114 INFO L93 Difference]: Finished difference Result 70 states and 79 transitions. [2020-08-21 15:51:06,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 15:51:06,115 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 50 [2020-08-21 15:51:06,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:06,116 INFO L225 Difference]: With dead ends: 70 [2020-08-21 15:51:06,116 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 15:51:06,117 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2020-08-21 15:51:06,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 15:51:06,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-21 15:51:06,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 15:51:06,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 58 transitions. [2020-08-21 15:51:06,123 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 58 transitions. Word has length 50 [2020-08-21 15:51:06,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:06,124 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 58 transitions. [2020-08-21 15:51:06,124 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 15:51:06,124 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 58 transitions. [2020-08-21 15:51:06,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 15:51:06,125 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:06,125 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:06,125 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 15:51:06,126 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:06,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:06,126 INFO L82 PathProgramCache]: Analyzing trace with hash 1926047290, now seen corresponding path program 2 times [2020-08-21 15:51:06,126 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:06,127 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1362314277] [2020-08-21 15:51:06,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:06,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:06,285 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:06,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:06,291 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-08-21 15:51:06,291 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1362314277] [2020-08-21 15:51:06,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:06,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 15:51:06,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599220655] [2020-08-21 15:51:06,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 15:51:06,293 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:06,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 15:51:06,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2020-08-21 15:51:06,293 INFO L87 Difference]: Start difference. First operand 53 states and 58 transitions. Second operand 11 states. [2020-08-21 15:51:06,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:06,505 INFO L93 Difference]: Finished difference Result 61 states and 67 transitions. [2020-08-21 15:51:06,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 15:51:06,505 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 52 [2020-08-21 15:51:06,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:06,507 INFO L225 Difference]: With dead ends: 61 [2020-08-21 15:51:06,507 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 15:51:06,508 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2020-08-21 15:51:06,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 15:51:06,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-21 15:51:06,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 15:51:06,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 61 transitions. [2020-08-21 15:51:06,517 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 61 transitions. Word has length 52 [2020-08-21 15:51:06,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:06,517 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 61 transitions. [2020-08-21 15:51:06,517 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 15:51:06,517 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 61 transitions. [2020-08-21 15:51:06,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 15:51:06,518 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:06,518 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:06,519 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 15:51:06,519 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:06,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:06,519 INFO L82 PathProgramCache]: Analyzing trace with hash 477761629, now seen corresponding path program 3 times [2020-08-21 15:51:06,519 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:06,520 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2037754949] [2020-08-21 15:51:06,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:06,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:06,611 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:06,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:06,616 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-08-21 15:51:06,617 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2037754949] [2020-08-21 15:51:06,617 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:06,617 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 15:51:06,617 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611842655] [2020-08-21 15:51:06,618 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 15:51:06,618 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:06,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 15:51:06,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-08-21 15:51:06,619 INFO L87 Difference]: Start difference. First operand 55 states and 61 transitions. Second operand 7 states. [2020-08-21 15:51:06,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:06,718 INFO L93 Difference]: Finished difference Result 86 states and 100 transitions. [2020-08-21 15:51:06,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 15:51:06,719 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 54 [2020-08-21 15:51:06,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:06,720 INFO L225 Difference]: With dead ends: 86 [2020-08-21 15:51:06,720 INFO L226 Difference]: Without dead ends: 74 [2020-08-21 15:51:06,721 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-21 15:51:06,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-21 15:51:06,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 67. [2020-08-21 15:51:06,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-21 15:51:06,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 75 transitions. [2020-08-21 15:51:06,729 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 75 transitions. Word has length 54 [2020-08-21 15:51:06,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:06,729 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 75 transitions. [2020-08-21 15:51:06,729 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 15:51:06,729 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 75 transitions. [2020-08-21 15:51:06,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 15:51:06,731 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:06,731 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:06,731 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 15:51:06,731 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:06,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:06,732 INFO L82 PathProgramCache]: Analyzing trace with hash 945709890, now seen corresponding path program 1 times [2020-08-21 15:51:06,732 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:06,732 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [655431726] [2020-08-21 15:51:06,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:06,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:06,798 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:06,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:06,803 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-08-21 15:51:06,803 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [655431726] [2020-08-21 15:51:06,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:06,804 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 15:51:06,804 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574358328] [2020-08-21 15:51:06,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 15:51:06,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:06,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 15:51:06,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-21 15:51:06,805 INFO L87 Difference]: Start difference. First operand 67 states and 75 transitions. Second operand 8 states. [2020-08-21 15:51:06,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:06,889 INFO L93 Difference]: Finished difference Result 79 states and 89 transitions. [2020-08-21 15:51:06,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 15:51:06,890 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 56 [2020-08-21 15:51:06,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:06,891 INFO L225 Difference]: With dead ends: 79 [2020-08-21 15:51:06,891 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 15:51:06,891 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-08-21 15:51:06,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 15:51:06,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-21 15:51:06,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 15:51:06,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 63 transitions. [2020-08-21 15:51:06,897 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 63 transitions. Word has length 56 [2020-08-21 15:51:06,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:06,898 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 63 transitions. [2020-08-21 15:51:06,898 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 15:51:06,898 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 63 transitions. [2020-08-21 15:51:06,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 15:51:06,899 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:06,899 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:06,900 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 15:51:06,900 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:06,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:06,900 INFO L82 PathProgramCache]: Analyzing trace with hash -1888314782, now seen corresponding path program 4 times [2020-08-21 15:51:06,900 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:06,901 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1833102158] [2020-08-21 15:51:06,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:06,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:07,003 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:07,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:07,008 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-08-21 15:51:07,008 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1833102158] [2020-08-21 15:51:07,009 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:07,009 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 15:51:07,009 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588134732] [2020-08-21 15:51:07,009 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 15:51:07,010 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:07,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 15:51:07,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-08-21 15:51:07,010 INFO L87 Difference]: Start difference. First operand 57 states and 63 transitions. Second operand 12 states. [2020-08-21 15:51:07,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:07,212 INFO L93 Difference]: Finished difference Result 80 states and 92 transitions. [2020-08-21 15:51:07,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 15:51:07,213 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 56 [2020-08-21 15:51:07,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:07,214 INFO L225 Difference]: With dead ends: 80 [2020-08-21 15:51:07,215 INFO L226 Difference]: Without dead ends: 59 [2020-08-21 15:51:07,216 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2020-08-21 15:51:07,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-21 15:51:07,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-21 15:51:07,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 15:51:07,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 65 transitions. [2020-08-21 15:51:07,228 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 65 transitions. Word has length 56 [2020-08-21 15:51:07,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:07,229 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 65 transitions. [2020-08-21 15:51:07,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 15:51:07,229 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 65 transitions. [2020-08-21 15:51:07,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 15:51:07,232 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:07,232 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:07,232 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 15:51:07,236 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:07,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:07,236 INFO L82 PathProgramCache]: Analyzing trace with hash -1242276355, now seen corresponding path program 5 times [2020-08-21 15:51:07,237 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:07,237 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [27272472] [2020-08-21 15:51:07,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:07,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:07,409 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:07,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:07,420 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-08-21 15:51:07,421 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [27272472] [2020-08-21 15:51:07,421 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:07,421 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 15:51:07,422 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684017380] [2020-08-21 15:51:07,422 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 15:51:07,422 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:07,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 15:51:07,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2020-08-21 15:51:07,424 INFO L87 Difference]: Start difference. First operand 59 states and 65 transitions. Second operand 13 states. [2020-08-21 15:51:07,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:07,742 INFO L93 Difference]: Finished difference Result 67 states and 74 transitions. [2020-08-21 15:51:07,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 15:51:07,742 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 58 [2020-08-21 15:51:07,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:07,744 INFO L225 Difference]: With dead ends: 67 [2020-08-21 15:51:07,744 INFO L226 Difference]: Without dead ends: 61 [2020-08-21 15:51:07,745 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=97, Invalid=365, Unknown=0, NotChecked=0, Total=462 [2020-08-21 15:51:07,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-21 15:51:07,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-08-21 15:51:07,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 15:51:07,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 68 transitions. [2020-08-21 15:51:07,764 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 68 transitions. Word has length 58 [2020-08-21 15:51:07,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:07,764 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 68 transitions. [2020-08-21 15:51:07,764 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 15:51:07,764 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 68 transitions. [2020-08-21 15:51:07,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-21 15:51:07,766 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:07,766 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:07,766 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 15:51:07,766 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:07,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:07,768 INFO L82 PathProgramCache]: Analyzing trace with hash 850551648, now seen corresponding path program 6 times [2020-08-21 15:51:07,768 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:07,769 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1054659051] [2020-08-21 15:51:07,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:07,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:07,856 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:07,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:07,864 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2020-08-21 15:51:07,864 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1054659051] [2020-08-21 15:51:07,864 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:07,865 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 15:51:07,865 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1030315678] [2020-08-21 15:51:07,865 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 15:51:07,866 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:07,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 15:51:07,866 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-08-21 15:51:07,866 INFO L87 Difference]: Start difference. First operand 61 states and 68 transitions. Second operand 9 states. [2020-08-21 15:51:08,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:08,002 INFO L93 Difference]: Finished difference Result 100 states and 118 transitions. [2020-08-21 15:51:08,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 15:51:08,002 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 60 [2020-08-21 15:51:08,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:08,004 INFO L225 Difference]: With dead ends: 100 [2020-08-21 15:51:08,004 INFO L226 Difference]: Without dead ends: 86 [2020-08-21 15:51:08,005 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2020-08-21 15:51:08,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-21 15:51:08,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 77. [2020-08-21 15:51:08,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-21 15:51:08,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 87 transitions. [2020-08-21 15:51:08,016 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 87 transitions. Word has length 60 [2020-08-21 15:51:08,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:08,016 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 87 transitions. [2020-08-21 15:51:08,016 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 15:51:08,016 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 87 transitions. [2020-08-21 15:51:08,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-21 15:51:08,017 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:08,017 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:08,018 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 15:51:08,018 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:08,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:08,018 INFO L82 PathProgramCache]: Analyzing trace with hash 1426761989, now seen corresponding path program 2 times [2020-08-21 15:51:08,019 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:08,019 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1490253584] [2020-08-21 15:51:08,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:08,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:08,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:08,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:08,122 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 11 proven. 11 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2020-08-21 15:51:08,124 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1490253584] [2020-08-21 15:51:08,126 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:08,127 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 15:51:08,127 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442429382] [2020-08-21 15:51:08,128 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 15:51:08,128 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:08,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 15:51:08,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-21 15:51:08,129 INFO L87 Difference]: Start difference. First operand 77 states and 87 transitions. Second operand 10 states. [2020-08-21 15:51:08,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:08,274 INFO L93 Difference]: Finished difference Result 102 states and 120 transitions. [2020-08-21 15:51:08,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 15:51:08,274 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 62 [2020-08-21 15:51:08,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:08,275 INFO L225 Difference]: With dead ends: 102 [2020-08-21 15:51:08,276 INFO L226 Difference]: Without dead ends: 88 [2020-08-21 15:51:08,276 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2020-08-21 15:51:08,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-21 15:51:08,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 79. [2020-08-21 15:51:08,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-21 15:51:08,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 89 transitions. [2020-08-21 15:51:08,285 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 89 transitions. Word has length 62 [2020-08-21 15:51:08,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:08,286 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 89 transitions. [2020-08-21 15:51:08,286 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 15:51:08,286 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 89 transitions. [2020-08-21 15:51:08,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-21 15:51:08,287 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:08,287 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:08,287 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 15:51:08,287 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:08,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:08,288 INFO L82 PathProgramCache]: Analyzing trace with hash -1340435035, now seen corresponding path program 7 times [2020-08-21 15:51:08,288 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:08,288 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [951571562] [2020-08-21 15:51:08,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:08,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:08,441 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:08,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:08,447 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 9 proven. 12 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2020-08-21 15:51:08,448 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [951571562] [2020-08-21 15:51:08,448 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:08,448 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 15:51:08,448 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2052745645] [2020-08-21 15:51:08,449 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 15:51:08,449 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:08,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 15:51:08,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2020-08-21 15:51:08,451 INFO L87 Difference]: Start difference. First operand 79 states and 89 transitions. Second operand 14 states. [2020-08-21 15:51:08,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:08,697 INFO L93 Difference]: Finished difference Result 115 states and 135 transitions. [2020-08-21 15:51:08,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 15:51:08,698 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 62 [2020-08-21 15:51:08,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:08,699 INFO L225 Difference]: With dead ends: 115 [2020-08-21 15:51:08,699 INFO L226 Difference]: Without dead ends: 83 [2020-08-21 15:51:08,700 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=87, Invalid=333, Unknown=0, NotChecked=0, Total=420 [2020-08-21 15:51:08,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-08-21 15:51:08,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2020-08-21 15:51:08,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-21 15:51:08,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 93 transitions. [2020-08-21 15:51:08,707 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 93 transitions. Word has length 62 [2020-08-21 15:51:08,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:08,708 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 93 transitions. [2020-08-21 15:51:08,708 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 15:51:08,708 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 93 transitions. [2020-08-21 15:51:08,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-21 15:51:08,709 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:08,709 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:08,709 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 15:51:08,709 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:08,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:08,710 INFO L82 PathProgramCache]: Analyzing trace with hash -1186490752, now seen corresponding path program 8 times [2020-08-21 15:51:08,710 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:08,710 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2060179253] [2020-08-21 15:51:08,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:08,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:08,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:08,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:08,864 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 12 proven. 17 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2020-08-21 15:51:08,865 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2060179253] [2020-08-21 15:51:08,865 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:08,865 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 15:51:08,865 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703814557] [2020-08-21 15:51:08,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 15:51:08,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:08,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 15:51:08,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 15:51:08,871 INFO L87 Difference]: Start difference. First operand 83 states and 93 transitions. Second operand 15 states. [2020-08-21 15:51:09,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:09,219 INFO L93 Difference]: Finished difference Result 91 states and 102 transitions. [2020-08-21 15:51:09,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 15:51:09,220 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 64 [2020-08-21 15:51:09,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:09,222 INFO L225 Difference]: With dead ends: 91 [2020-08-21 15:51:09,222 INFO L226 Difference]: Without dead ends: 85 [2020-08-21 15:51:09,223 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=141, Invalid=509, Unknown=0, NotChecked=0, Total=650 [2020-08-21 15:51:09,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-21 15:51:09,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2020-08-21 15:51:09,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-21 15:51:09,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 96 transitions. [2020-08-21 15:51:09,230 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 96 transitions. Word has length 64 [2020-08-21 15:51:09,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:09,231 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 96 transitions. [2020-08-21 15:51:09,231 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 15:51:09,231 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 96 transitions. [2020-08-21 15:51:09,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 15:51:09,232 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:09,232 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:09,232 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 15:51:09,232 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:09,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:09,233 INFO L82 PathProgramCache]: Analyzing trace with hash -1374058717, now seen corresponding path program 9 times [2020-08-21 15:51:09,233 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:09,233 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1388676063] [2020-08-21 15:51:09,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:09,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:09,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:09,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:09,339 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 11 proven. 17 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2020-08-21 15:51:09,339 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1388676063] [2020-08-21 15:51:09,339 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:09,339 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 15:51:09,340 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524658982] [2020-08-21 15:51:09,341 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 15:51:09,342 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:09,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 15:51:09,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2020-08-21 15:51:09,342 INFO L87 Difference]: Start difference. First operand 85 states and 96 transitions. Second operand 11 states. [2020-08-21 15:51:09,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:09,529 INFO L93 Difference]: Finished difference Result 143 states and 173 transitions. [2020-08-21 15:51:09,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 15:51:09,530 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 66 [2020-08-21 15:51:09,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:09,531 INFO L225 Difference]: With dead ends: 143 [2020-08-21 15:51:09,531 INFO L226 Difference]: Without dead ends: 127 [2020-08-21 15:51:09,533 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=62, Invalid=178, Unknown=0, NotChecked=0, Total=240 [2020-08-21 15:51:09,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2020-08-21 15:51:09,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 103. [2020-08-21 15:51:09,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-21 15:51:09,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 118 transitions. [2020-08-21 15:51:09,542 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 118 transitions. Word has length 66 [2020-08-21 15:51:09,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:09,543 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 118 transitions. [2020-08-21 15:51:09,543 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 15:51:09,543 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 118 transitions. [2020-08-21 15:51:09,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 15:51:09,544 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:09,544 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:09,544 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 15:51:09,545 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:09,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:09,545 INFO L82 PathProgramCache]: Analyzing trace with hash -2063125144, now seen corresponding path program 3 times [2020-08-21 15:51:09,545 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:09,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [956899245] [2020-08-21 15:51:09,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:09,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:09,636 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:09,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:09,643 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 22 proven. 14 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2020-08-21 15:51:09,643 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [956899245] [2020-08-21 15:51:09,643 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:09,643 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 15:51:09,644 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331285007] [2020-08-21 15:51:09,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 15:51:09,644 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:09,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 15:51:09,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-08-21 15:51:09,645 INFO L87 Difference]: Start difference. First operand 103 states and 118 transitions. Second operand 10 states. [2020-08-21 15:51:09,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:09,799 INFO L93 Difference]: Finished difference Result 121 states and 140 transitions. [2020-08-21 15:51:09,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 15:51:09,799 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 68 [2020-08-21 15:51:09,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:09,800 INFO L225 Difference]: With dead ends: 121 [2020-08-21 15:51:09,800 INFO L226 Difference]: Without dead ends: 87 [2020-08-21 15:51:09,801 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-08-21 15:51:09,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-08-21 15:51:09,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2020-08-21 15:51:09,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-21 15:51:09,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 99 transitions. [2020-08-21 15:51:09,808 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 99 transitions. Word has length 68 [2020-08-21 15:51:09,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:09,808 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 99 transitions. [2020-08-21 15:51:09,809 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 15:51:09,809 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 99 transitions. [2020-08-21 15:51:09,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 15:51:09,810 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:09,810 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:09,810 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 15:51:09,810 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:09,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:09,811 INFO L82 PathProgramCache]: Analyzing trace with hash 1776856968, now seen corresponding path program 4 times [2020-08-21 15:51:09,811 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:09,811 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1546377281] [2020-08-21 15:51:09,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:09,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:09,898 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:09,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:09,904 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 18 proven. 17 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2020-08-21 15:51:09,905 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1546377281] [2020-08-21 15:51:09,905 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:09,905 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 15:51:09,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1300210524] [2020-08-21 15:51:09,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 15:51:09,906 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:09,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 15:51:09,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2020-08-21 15:51:09,907 INFO L87 Difference]: Start difference. First operand 87 states and 99 transitions. Second operand 11 states. [2020-08-21 15:51:10,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:10,044 INFO L93 Difference]: Finished difference Result 118 states and 141 transitions. [2020-08-21 15:51:10,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 15:51:10,044 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 68 [2020-08-21 15:51:10,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:10,045 INFO L225 Difference]: With dead ends: 118 [2020-08-21 15:51:10,045 INFO L226 Difference]: Without dead ends: 102 [2020-08-21 15:51:10,046 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2020-08-21 15:51:10,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-21 15:51:10,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 91. [2020-08-21 15:51:10,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-21 15:51:10,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 104 transitions. [2020-08-21 15:51:10,054 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 104 transitions. Word has length 68 [2020-08-21 15:51:10,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:10,055 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 104 transitions. [2020-08-21 15:51:10,055 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 15:51:10,055 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 104 transitions. [2020-08-21 15:51:10,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 15:51:10,055 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:10,056 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:10,056 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 15:51:10,056 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:10,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:10,057 INFO L82 PathProgramCache]: Analyzing trace with hash -1222495832, now seen corresponding path program 10 times [2020-08-21 15:51:10,057 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:10,057 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1388530545] [2020-08-21 15:51:10,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:10,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:10,198 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:10,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:10,207 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2020-08-21 15:51:10,208 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1388530545] [2020-08-21 15:51:10,208 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:10,209 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 15:51:10,209 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1330361218] [2020-08-21 15:51:10,209 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 15:51:10,209 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:10,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 15:51:10,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2020-08-21 15:51:10,210 INFO L87 Difference]: Start difference. First operand 91 states and 104 transitions. Second operand 16 states. [2020-08-21 15:51:10,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:10,523 INFO L93 Difference]: Finished difference Result 135 states and 162 transitions. [2020-08-21 15:51:10,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 15:51:10,525 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 68 [2020-08-21 15:51:10,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:10,526 INFO L225 Difference]: With dead ends: 135 [2020-08-21 15:51:10,527 INFO L226 Difference]: Without dead ends: 95 [2020-08-21 15:51:10,527 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=113, Invalid=439, Unknown=0, NotChecked=0, Total=552 [2020-08-21 15:51:10,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-21 15:51:10,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2020-08-21 15:51:10,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-21 15:51:10,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 108 transitions. [2020-08-21 15:51:10,535 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 108 transitions. Word has length 68 [2020-08-21 15:51:10,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:10,536 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 108 transitions. [2020-08-21 15:51:10,536 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 15:51:10,536 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 108 transitions. [2020-08-21 15:51:10,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-21 15:51:10,537 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:10,537 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:10,537 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 15:51:10,537 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:10,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:10,538 INFO L82 PathProgramCache]: Analyzing trace with hash 1314701251, now seen corresponding path program 11 times [2020-08-21 15:51:10,538 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:10,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [22728272] [2020-08-21 15:51:10,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:10,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:10,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:10,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:10,906 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 10 proven. 29 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-08-21 15:51:10,907 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [22728272] [2020-08-21 15:51:10,907 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:10,907 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 15:51:10,907 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [350306051] [2020-08-21 15:51:10,908 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 15:51:10,908 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:10,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 15:51:10,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2020-08-21 15:51:10,909 INFO L87 Difference]: Start difference. First operand 95 states and 108 transitions. Second operand 13 states. [2020-08-21 15:51:11,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:11,097 INFO L93 Difference]: Finished difference Result 95 states and 108 transitions. [2020-08-21 15:51:11,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 15:51:11,097 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 70 [2020-08-21 15:51:11,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:11,098 INFO L225 Difference]: With dead ends: 95 [2020-08-21 15:51:11,098 INFO L226 Difference]: Without dead ends: 0 [2020-08-21 15:51:11,099 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2020-08-21 15:51:11,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-21 15:51:11,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-21 15:51:11,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-21 15:51:11,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-21 15:51:11,100 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 70 [2020-08-21 15:51:11,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:11,101 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-21 15:51:11,101 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 15:51:11,101 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-21 15:51:11,101 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-21 15:51:11,102 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 15:51:11,105 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-21 15:51:11,398 WARN L193 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 145 DAG size of output: 136 [2020-08-21 15:51:13,134 WARN L193 SmtUtils]: Spent 1.65 s on a formula simplification. DAG size of input: 132 DAG size of output: 63 [2020-08-21 15:51:13,247 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 28 [2020-08-21 15:51:13,436 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 25 [2020-08-21 15:51:13,441 INFO L268 CegarLoopResult]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2020-08-21 15:51:13,441 INFO L264 CegarLoopResult]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#NULL.base| |old(#NULL.base)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|)) [2020-08-21 15:51:13,441 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-21 15:51:13,442 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-21 15:51:13,442 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-21 15:51:13,442 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-21 15:51:13,442 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-21 15:51:13,442 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 4 6) no Hoare annotation was computed. [2020-08-21 15:51:13,442 INFO L268 CegarLoopResult]: For program point L5(line 5) no Hoare annotation was computed. [2020-08-21 15:51:13,442 INFO L268 CegarLoopResult]: For program point L5-2(lines 4 6) no Hoare annotation was computed. [2020-08-21 15:51:13,442 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 4 6) no Hoare annotation was computed. [2020-08-21 15:51:13,443 INFO L264 CegarLoopResult]: At program point L35-3(lines 35 36) the Hoare annotation is: (let ((.cse0 (<= main_~nc_A~0 2)) (.cse1 (<= 1 main_~nc_B~0)) (.cse4 (= (select (select |#memory_int| |main_~#string_B~0.base|) (+ |main_~#string_B~0.offset| 4)) 0)) (.cse3 (= main_~nc_B~0 0)) (.cse5 (= |main_~#string_B~0.offset| 0)) (.cse2 (= 0 main_~found~0))) (or (and .cse0 .cse1 .cse2) (and .cse3 .cse0 .cse2) (and .cse4 .cse5 (<= main_~nc_B~0 4) .cse1 .cse2) (and .cse4 .cse3 .cse5 .cse2))) [2020-08-21 15:51:13,443 INFO L268 CegarLoopResult]: For program point L35-4(lines 18 61) no Hoare annotation was computed. [2020-08-21 15:51:13,443 INFO L268 CegarLoopResult]: For program point L31-1(lines 31 32) no Hoare annotation was computed. [2020-08-21 15:51:13,443 INFO L264 CegarLoopResult]: At program point L31-3(lines 31 32) the Hoare annotation is: (and (= (select (select |#memory_int| |main_~#string_B~0.base|) (+ |main_~#string_B~0.offset| 4)) 0) (= |main_~#string_B~0.offset| 0) (= 0 main_~found~0)) [2020-08-21 15:51:13,443 INFO L268 CegarLoopResult]: For program point L31-4(lines 31 32) no Hoare annotation was computed. [2020-08-21 15:51:13,443 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 17 61) no Hoare annotation was computed. [2020-08-21 15:51:13,444 INFO L268 CegarLoopResult]: For program point L44(lines 44 53) no Hoare annotation was computed. [2020-08-21 15:51:13,444 INFO L264 CegarLoopResult]: At program point L44-2(lines 42 54) the Hoare annotation is: (let ((.cse13 (+ main_~j~0 1)) (.cse8 (+ main_~j~0 3))) (let ((.cse1 (<= main_~nc_A~0 2)) (.cse2 (<= main_~nc_A~0 (+ main_~i~0 1))) (.cse10 (<= main_~nc_B~0 3)) (.cse7 (= main_~i~0 main_~j~0)) (.cse5 (<= main_~nc_A~0 main_~i~0)) (.cse4 (<= 3 main_~nc_B~0)) (.cse9 (<= .cse8 main_~nc_B~0)) (.cse0 (<= 4 main_~nc_B~0)) (.cse16 (<= main_~nc_B~0 4)) (.cse12 (= main_~i~0 0)) (.cse6 (<= .cse13 main_~nc_B~0)) (.cse14 (<= 1 main_~nc_B~0)) (.cse15 (<= 2 main_~nc_B~0)) (.cse11 (<= main_~nc_B~0 (+ main_~j~0 2))) (.cse3 (= 0 main_~found~0))) (or (and .cse0 (= main_~j~0 0) .cse1 .cse2 .cse3) (and .cse4 .cse5 .cse6 .cse1 .cse3) (and (<= 0 main_~j~0) (= main_~nc_B~0 0)) (and .cse0 .cse6 .cse1 .cse2 .cse7 .cse3) (and .cse4 (<= main_~nc_B~0 .cse8) .cse9 .cse10 .cse3) (and .cse4 .cse0 .cse5 .cse6 (<= main_~nc_A~0 3) .cse3) (and .cse4 .cse11 .cse10 .cse3) (and .cse12 .cse6 .cse7 .cse3 (<= main_~nc_A~0 (+ main_~i~0 2))) (and (<= main_~nc_B~0 1) (<= main_~nc_B~0 .cse13) .cse14 .cse3) (and .cse15 .cse5 .cse6 (<= main_~nc_A~0 1) .cse3) (and (<= main_~nc_B~0 (+ main_~j~0 4)) .cse4 .cse0 .cse9 .cse16 .cse3) (and .cse0 .cse11 .cse16 .cse3) (and (= main_~nc_A~0 0) .cse12 .cse6 .cse14 .cse3) (and .cse15 .cse11 (<= main_~nc_B~0 2) .cse3)))) [2020-08-21 15:51:13,444 INFO L268 CegarLoopResult]: For program point L28(line 28) no Hoare annotation was computed. [2020-08-21 15:51:13,444 INFO L268 CegarLoopResult]: For program point L24(line 24) no Hoare annotation was computed. [2020-08-21 15:51:13,444 INFO L264 CegarLoopResult]: At program point L58(line 58) the Hoare annotation is: (let ((.cse0 (+ main_~j~0 1)) (.cse2 (<= 1 main_~nc_B~0)) (.cse3 (<= main_~nc_B~0 main_~j~0)) (.cse1 (= 1 main_~found~0))) (or (and (< main_~nc_B~0 .cse0) (<= main_~nc_B~0 2) .cse1 .cse2) (and (<= 3 main_~nc_B~0) .cse3 (<= main_~nc_B~0 3) .cse1) (and (<= 0 main_~j~0) (= main_~nc_B~0 0) .cse1) (and (<= .cse0 main_~nc_B~0) .cse2 (= 0 main_~found~0)) (and (<= 4 main_~nc_B~0) .cse3 (<= main_~nc_B~0 4) .cse1))) [2020-08-21 15:51:13,445 INFO L268 CegarLoopResult]: For program point L58-1(line 58) no Hoare annotation was computed. [2020-08-21 15:51:13,445 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 17 61) no Hoare annotation was computed. [2020-08-21 15:51:13,445 INFO L268 CegarLoopResult]: For program point L42-2(lines 42 54) no Hoare annotation was computed. [2020-08-21 15:51:13,445 INFO L264 CegarLoopResult]: At program point mainENTRY(lines 17 61) the Hoare annotation is: (= |old(#valid)| |#valid|) [2020-08-21 15:51:13,445 INFO L268 CegarLoopResult]: For program point L26-2(lines 26 27) no Hoare annotation was computed. [2020-08-21 15:51:13,445 INFO L264 CegarLoopResult]: At program point L26-3(lines 26 27) the Hoare annotation is: (and (= |main_~#string_B~0.offset| 0) (= 0 main_~found~0)) [2020-08-21 15:51:13,445 INFO L268 CegarLoopResult]: For program point L26-4(lines 26 27) no Hoare annotation was computed. [2020-08-21 15:51:13,445 INFO L268 CegarLoopResult]: For program point L22-2(lines 22 23) no Hoare annotation was computed. [2020-08-21 15:51:13,446 INFO L264 CegarLoopResult]: At program point L22-3(lines 22 23) the Hoare annotation is: (and (= |main_~#string_B~0.offset| 0) (= 0 main_~found~0)) [2020-08-21 15:51:13,446 INFO L268 CegarLoopResult]: For program point L22-4(lines 22 23) no Hoare annotation was computed. [2020-08-21 15:51:13,446 INFO L268 CegarLoopResult]: For program point L35-1(lines 35 36) no Hoare annotation was computed. [2020-08-21 15:51:13,446 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 7 12) the Hoare annotation is: true [2020-08-21 15:51:13,446 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 7 12) no Hoare annotation was computed. [2020-08-21 15:51:13,446 INFO L268 CegarLoopResult]: For program point L9(line 9) no Hoare annotation was computed. [2020-08-21 15:51:13,446 INFO L268 CegarLoopResult]: For program point L8(lines 8 10) no Hoare annotation was computed. [2020-08-21 15:51:13,446 INFO L268 CegarLoopResult]: For program point L8-2(lines 7 12) no Hoare annotation was computed. [2020-08-21 15:51:13,447 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 9) no Hoare annotation was computed. [2020-08-21 15:51:13,457 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 15:51:13,465 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 15:51:13,472 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 15:51:13,472 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 15:51:13,473 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 15:51:13,473 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 15:51:13,475 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 03:51:13 BoogieIcfgContainer [2020-08-21 15:51:13,475 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 15:51:13,476 INFO L168 Benchmark]: Toolchain (without parser) took 11209.27 ms. Allocated memory was 139.5 MB in the beginning and 338.7 MB in the end (delta: 199.2 MB). Free memory was 102.6 MB in the beginning and 291.2 MB in the end (delta: -188.6 MB). Peak memory consumption was 207.9 MB. Max. memory is 7.1 GB. [2020-08-21 15:51:13,477 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 139.5 MB. Free memory was 121.0 MB in the beginning and 120.8 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-21 15:51:13,478 INFO L168 Benchmark]: CACSL2BoogieTranslator took 370.27 ms. Allocated memory was 139.5 MB in the beginning and 201.9 MB in the end (delta: 62.4 MB). Free memory was 102.4 MB in the beginning and 180.7 MB in the end (delta: -78.3 MB). Peak memory consumption was 22.7 MB. Max. memory is 7.1 GB. [2020-08-21 15:51:13,478 INFO L168 Benchmark]: Boogie Preprocessor took 43.37 ms. Allocated memory is still 201.9 MB. Free memory was 180.7 MB in the beginning and 178.3 MB in the end (delta: 2.4 MB). Peak memory consumption was 2.4 MB. Max. memory is 7.1 GB. [2020-08-21 15:51:13,478 INFO L168 Benchmark]: RCFGBuilder took 398.20 ms. Allocated memory is still 201.9 MB. Free memory was 178.3 MB in the beginning and 158.8 MB in the end (delta: 19.6 MB). Peak memory consumption was 19.6 MB. Max. memory is 7.1 GB. [2020-08-21 15:51:13,479 INFO L168 Benchmark]: TraceAbstraction took 10392.86 ms. Allocated memory was 201.9 MB in the beginning and 338.7 MB in the end (delta: 136.8 MB). Free memory was 158.8 MB in the beginning and 291.2 MB in the end (delta: -132.5 MB). Peak memory consumption was 201.6 MB. Max. memory is 7.1 GB. [2020-08-21 15:51:13,482 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 139.5 MB. Free memory was 121.0 MB in the beginning and 120.8 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 370.27 ms. Allocated memory was 139.5 MB in the beginning and 201.9 MB in the end (delta: 62.4 MB). Free memory was 102.4 MB in the beginning and 180.7 MB in the end (delta: -78.3 MB). Peak memory consumption was 22.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 43.37 ms. Allocated memory is still 201.9 MB. Free memory was 180.7 MB in the beginning and 178.3 MB in the end (delta: 2.4 MB). Peak memory consumption was 2.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 398.20 ms. Allocated memory is still 201.9 MB. Free memory was 178.3 MB in the beginning and 158.8 MB in the end (delta: 19.6 MB). Peak memory consumption was 19.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 10392.86 ms. Allocated memory was 201.9 MB in the beginning and 338.7 MB in the end (delta: 136.8 MB). Free memory was 158.8 MB in the beginning and 291.2 MB in the end (delta: -132.5 MB). Peak memory consumption was 201.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - GenericResult: Unfinished Backtranslation unknown boogie variable #memory_int - GenericResult: Unfinished Backtranslation unknown boogie variable #memory_int - GenericResult: Unfinished Backtranslation unknown boogie variable #memory_int - GenericResult: Unfinished Backtranslation unknown boogie variable #memory_int - GenericResult: Unfinished Backtranslation unknown boogie variable #memory_int - GenericResult: Unfinished Backtranslation unknown boogie variable #memory_int * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 9]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 31]: Loop Invariant [2020-08-21 15:51:13,488 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 15:51:13,488 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int Derived loop invariant: (unknown-#memory_int-unknown[string_B][string_B + 4] == 0 && string_B == 0) && 0 == found - InvariantResult [Line: 26]: Loop Invariant Derived loop invariant: string_B == 0 && 0 == found - InvariantResult [Line: 22]: Loop Invariant Derived loop invariant: string_B == 0 && 0 == found - InvariantResult [Line: 42]: Loop Invariant Derived loop invariant: ((((((((((((((((4 <= nc_B && j == 0) && nc_A <= 2) && nc_A <= i + 1) && 0 == found) || ((((3 <= nc_B && nc_A <= i) && j + 1 <= nc_B) && nc_A <= 2) && 0 == found)) || (0 <= j && nc_B == 0)) || (((((4 <= nc_B && j + 1 <= nc_B) && nc_A <= 2) && nc_A <= i + 1) && i == j) && 0 == found)) || ((((3 <= nc_B && nc_B <= j + 3) && j + 3 <= nc_B) && nc_B <= 3) && 0 == found)) || (((((3 <= nc_B && 4 <= nc_B) && nc_A <= i) && j + 1 <= nc_B) && nc_A <= 3) && 0 == found)) || (((3 <= nc_B && nc_B <= j + 2) && nc_B <= 3) && 0 == found)) || ((((i == 0 && j + 1 <= nc_B) && i == j) && 0 == found) && nc_A <= i + 2)) || (((nc_B <= 1 && nc_B <= j + 1) && 1 <= nc_B) && 0 == found)) || ((((2 <= nc_B && nc_A <= i) && j + 1 <= nc_B) && nc_A <= 1) && 0 == found)) || (((((nc_B <= j + 4 && 3 <= nc_B) && 4 <= nc_B) && j + 3 <= nc_B) && nc_B <= 4) && 0 == found)) || (((4 <= nc_B && nc_B <= j + 2) && nc_B <= 4) && 0 == found)) || ((((nc_A == 0 && i == 0) && j + 1 <= nc_B) && 1 <= nc_B) && 0 == found)) || (((2 <= nc_B && nc_B <= j + 2) && nc_B <= 2) && 0 == found) - InvariantResult [Line: 35]: Loop Invariant [2020-08-21 15:51:13,491 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 15:51:13,491 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 15:51:13,492 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 15:51:13,492 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int Derived loop invariant: ((((nc_A <= 2 && 1 <= nc_B) && 0 == found) || ((nc_B == 0 && nc_A <= 2) && 0 == found)) || ((((unknown-#memory_int-unknown[string_B][string_B + 4] == 0 && string_B == 0) && nc_B <= 4) && 1 <= nc_B) && 0 == found)) || (((unknown-#memory_int-unknown[string_B][string_B + 4] == 0 && nc_B == 0) && string_B == 0) && 0 == found) - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 39 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 7.9s, OverallIterations: 23, TraceHistogramMax: 6, AutomataDifference: 4.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 2.3s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 545 SDtfs, 447 SDslu, 2131 SDs, 0 SdLazy, 2824 SolverSat, 308 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 326 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 254 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 2.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=103occurred in iteration=19, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 23 MinimizatonAttempts, 128 StatesRemovedByMinimization, 10 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 11 LocationsWithAnnotation, 38 PreInvPairs, 118 NumberOfFragments, 419 HoareAnnotationTreeSize, 38 FomulaSimplifications, 7556 FormulaSimplificationTreeSizeReduction, 0.3s HoareSimplificationTime, 11 FomulaSimplificationsInter, 4917 FormulaSimplificationTreeSizeReductionInter, 1.9s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 2.3s InterpolantComputationTime, 1210 NumberOfCodeBlocks, 1210 NumberOfCodeBlocksAsserted, 23 NumberOfCheckSat, 1187 ConstructedInterpolants, 0 QuantifiedInterpolants, 151099 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 23 InterpolantComputations, 3 PerfectInterpolantSequences, 1261/1470 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 correct! Received shutdown request...