/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.1 --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/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-22 03:09:40,273 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 03:09:40,276 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 03:09:40,314 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 03:09:40,315 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 03:09:40,323 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 03:09:40,324 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 03:09:40,326 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 03:09:40,327 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 03:09:40,328 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 03:09:40,329 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 03:09:40,330 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 03:09:40,330 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 03:09:40,331 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 03:09:40,332 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 03:09:40,333 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 03:09:40,333 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 03:09:40,334 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 03:09:40,336 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 03:09:40,337 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 03:09:40,338 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 03:09:40,339 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 03:09:40,340 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 03:09:40,341 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 03:09:40,343 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-22 03:09:40,344 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-22 03:09:40,344 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-22 03:09:40,345 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-22 03:09:40,345 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-22 03:09:40,346 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-22 03:09:40,350 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 03:09:40,351 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 03:09:40,352 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 03:09:40,353 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-22 03:09:40,374 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 03:09:40,374 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 03:09:40,375 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 03:09:40,376 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 03:09:40,376 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 03:09:40,376 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 03:09:40,376 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 03:09:40,376 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 03:09:40,377 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 03:09:40,377 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 03:09:40,377 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 03:09:40,377 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 03:09:40,377 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 03:09:40,378 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 03:09:40,378 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 03:09:40,378 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 03:09:40,378 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 03:09:40,378 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 03:09:40,378 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 03:09:40,379 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 03:09:40,379 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 03:09:40,379 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 03:09:40,379 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 03:09:40,379 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 03:09:40,380 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 03:09:40,380 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 03:09:40,380 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 03:09:40,380 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 03:09:40,380 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 03:09:40,381 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1;log-additional-information=true; [2020-08-22 03:09:40,699 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 03:09:40,718 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 03:09:40,722 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 03:09:40,724 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 03:09:40,725 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 03:09:40,726 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2020-08-22 03:09:40,785 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/3762ed490/db969a3fb6ff4bcf89758a61134f4969/FLAG7927b43bf [2020-08-22 03:09:41,239 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 03:09:41,240 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/invert_string-1.c [2020-08-22 03:09:41,247 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/3762ed490/db969a3fb6ff4bcf89758a61134f4969/FLAG7927b43bf [2020-08-22 03:09:41,612 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/3762ed490/db969a3fb6ff4bcf89758a61134f4969 [2020-08-22 03:09:41,621 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 03:09:41,623 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 03:09:41,624 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 03:09:41,625 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 03:09:41,629 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 03:09:41,631 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 03:09:41" (1/1) ... [2020-08-22 03:09:41,633 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@32e3ee29 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:41, skipping insertion in model container [2020-08-22 03:09:41,634 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 03:09:41" (1/1) ... [2020-08-22 03:09:41,642 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 03:09:41,666 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 03:09:41,852 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 03:09:41,856 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 03:09:41,879 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 03:09:41,898 INFO L208 MainTranslator]: Completed translation [2020-08-22 03:09:41,898 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:41 WrapperNode [2020-08-22 03:09:41,898 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 03:09:41,899 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 03:09:41,899 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 03:09:41,899 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 03:09:41,988 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:41" (1/1) ... [2020-08-22 03:09:41,988 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:41" (1/1) ... [2020-08-22 03:09:42,000 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:41" (1/1) ... [2020-08-22 03:09:42,001 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:41" (1/1) ... [2020-08-22 03:09:42,008 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:41" (1/1) ... [2020-08-22 03:09:42,016 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:41" (1/1) ... [2020-08-22 03:09:42,018 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:41" (1/1) ... [2020-08-22 03:09:42,021 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 03:09:42,022 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 03:09:42,022 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 03:09:42,022 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 03:09:42,023 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:41" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 03:09:42,078 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 03:09:42,079 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 03:09:42,079 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 03:09:42,079 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 03:09:42,079 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 03:09:42,079 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-22 03:09:42,079 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 03:09:42,080 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-22 03:09:42,080 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-08-22 03:09:42,080 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 03:09:42,080 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-22 03:09:42,080 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-22 03:09:42,080 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-22 03:09:42,081 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-22 03:09:42,081 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 03:09:42,081 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 03:09:42,383 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 03:09:42,383 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-22 03:09:42,388 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 03:09:42 BoogieIcfgContainer [2020-08-22 03:09:42,388 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 03:09:42,389 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 03:09:42,390 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 03:09:42,393 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 03:09:42,393 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 03:09:41" (1/3) ... [2020-08-22 03:09:42,394 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2295423e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 03:09:42, skipping insertion in model container [2020-08-22 03:09:42,395 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:41" (2/3) ... [2020-08-22 03:09:42,395 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2295423e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 03:09:42, skipping insertion in model container [2020-08-22 03:09:42,395 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 03:09:42" (3/3) ... [2020-08-22 03:09:42,397 INFO L109 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-08-22 03:09:42,408 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 03:09:42,416 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 03:09:42,431 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 03:09:42,451 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 03:09:42,451 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 03:09:42,451 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 03:09:42,451 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 03:09:42,451 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 03:09:42,452 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 03:09:42,452 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 03:09:42,452 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 03:09:42,469 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-08-22 03:09:42,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-22 03:09:42,475 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:42,476 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:42,476 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:42,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:42,482 INFO L82 PathProgramCache]: Analyzing trace with hash -474003824, now seen corresponding path program 1 times [2020-08-22 03:09:42,488 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:42,489 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1391852220] [2020-08-22 03:09:42,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:42,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:42,662 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:42,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:42,675 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:42,680 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1391852220] [2020-08-22 03:09:42,683 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 03:09:42,687 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 03:09:42,688 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [602259310] [2020-08-22 03:09:42,700 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 03:09:42,701 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:42,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 03:09:42,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 03:09:42,732 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 3 states. [2020-08-22 03:09:42,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:42,891 INFO L93 Difference]: Finished difference Result 51 states and 65 transitions. [2020-08-22 03:09:42,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 03:09:42,894 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-22 03:09:42,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:42,908 INFO L225 Difference]: With dead ends: 51 [2020-08-22 03:09:42,909 INFO L226 Difference]: Without dead ends: 24 [2020-08-22 03:09:42,913 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 03:09:42,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-22 03:09:42,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-22 03:09:42,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-22 03:09:42,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-22 03:09:42,968 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2020-08-22 03:09:42,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:42,969 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-22 03:09:42,969 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 03:09:42,970 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-22 03:09:42,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-22 03:09:42,972 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:42,972 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:42,973 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 03:09:42,974 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:42,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:42,975 INFO L82 PathProgramCache]: Analyzing trace with hash 227060754, now seen corresponding path program 1 times [2020-08-22 03:09:42,975 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:42,977 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1135546615] [2020-08-22 03:09:42,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:43,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:43,102 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:43,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:43,112 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:43,113 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1135546615] [2020-08-22 03:09:43,113 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 03:09:43,113 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 03:09:43,114 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [644698526] [2020-08-22 03:09:43,115 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 03:09:43,116 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:43,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 03:09:43,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-22 03:09:43,117 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 5 states. [2020-08-22 03:09:43,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:43,235 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2020-08-22 03:09:43,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 03:09:43,236 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-22 03:09:43,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:43,239 INFO L225 Difference]: With dead ends: 44 [2020-08-22 03:09:43,239 INFO L226 Difference]: Without dead ends: 30 [2020-08-22 03:09:43,240 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-22 03:09:43,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-22 03:09:43,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-08-22 03:09:43,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-22 03:09:43,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2020-08-22 03:09:43,253 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2020-08-22 03:09:43,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:43,253 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2020-08-22 03:09:43,254 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 03:09:43,254 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2020-08-22 03:09:43,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-22 03:09:43,255 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:43,255 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:43,255 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 03:09:43,255 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:43,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:43,256 INFO L82 PathProgramCache]: Analyzing trace with hash -714610672, now seen corresponding path program 1 times [2020-08-22 03:09:43,256 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:43,257 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [434784251] [2020-08-22 03:09:43,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:43,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:43,365 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:43,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:43,371 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-22 03:09:43,372 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [434784251] [2020-08-22 03:09:43,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 03:09:43,373 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 03:09:43,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183794559] [2020-08-22 03:09:43,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 03:09:43,374 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:43,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 03:09:43,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 03:09:43,374 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 5 states. [2020-08-22 03:09:43,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:43,487 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2020-08-22 03:09:43,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 03:09:43,488 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-08-22 03:09:43,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:43,490 INFO L225 Difference]: With dead ends: 37 [2020-08-22 03:09:43,490 INFO L226 Difference]: Without dead ends: 26 [2020-08-22 03:09:43,491 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-22 03:09:43,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-22 03:09:43,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-22 03:09:43,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-22 03:09:43,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-22 03:09:43,499 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2020-08-22 03:09:43,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:43,499 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-22 03:09:43,499 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 03:09:43,500 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-22 03:09:43,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-22 03:09:43,501 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:43,501 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] [2020-08-22 03:09:43,501 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 03:09:43,502 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:43,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:43,502 INFO L82 PathProgramCache]: Analyzing trace with hash 483863630, now seen corresponding path program 1 times [2020-08-22 03:09:43,503 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:43,503 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [460318845] [2020-08-22 03:09:43,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:43,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:43,936 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:43,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:43,942 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:43,943 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [460318845] [2020-08-22 03:09:43,943 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:43,943 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-22 03:09:43,946 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351498067] [2020-08-22 03:09:43,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 03:09:43,947 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:43,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 03:09:43,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2020-08-22 03:09:43,948 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 13 states. [2020-08-22 03:09:44,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:44,516 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-22 03:09:44,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-22 03:09:44,517 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 21 [2020-08-22 03:09:44,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:44,519 INFO L225 Difference]: With dead ends: 50 [2020-08-22 03:09:44,519 INFO L226 Difference]: Without dead ends: 48 [2020-08-22 03:09:44,520 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2020-08-22 03:09:44,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-22 03:09:44,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 39. [2020-08-22 03:09:44,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-22 03:09:44,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-22 03:09:44,530 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 21 [2020-08-22 03:09:44,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:44,531 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-22 03:09:44,531 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 03:09:44,531 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-22 03:09:44,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-22 03:09:44,532 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:44,533 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:44,533 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 03:09:44,533 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:44,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:44,534 INFO L82 PathProgramCache]: Analyzing trace with hash 714881356, now seen corresponding path program 2 times [2020-08-22 03:09:44,534 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:44,534 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [604342789] [2020-08-22 03:09:44,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:44,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:44,619 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:44,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:44,625 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:44,625 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [604342789] [2020-08-22 03:09:44,625 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:44,626 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 03:09:44,626 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1868079052] [2020-08-22 03:09:44,627 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 03:09:44,627 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:44,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 03:09:44,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-08-22 03:09:44,628 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 7 states. [2020-08-22 03:09:44,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:44,805 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2020-08-22 03:09:44,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 03:09:44,806 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2020-08-22 03:09:44,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:44,807 INFO L225 Difference]: With dead ends: 59 [2020-08-22 03:09:44,807 INFO L226 Difference]: Without dead ends: 48 [2020-08-22 03:09:44,808 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-08-22 03:09:44,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-22 03:09:44,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2020-08-22 03:09:44,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-22 03:09:44,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-22 03:09:44,817 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 23 [2020-08-22 03:09:44,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:44,817 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-22 03:09:44,817 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 03:09:44,818 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-22 03:09:44,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-22 03:09:44,819 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:44,819 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] [2020-08-22 03:09:44,819 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 03:09:44,820 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:44,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:44,820 INFO L82 PathProgramCache]: Analyzing trace with hash -163832182, now seen corresponding path program 3 times [2020-08-22 03:09:44,820 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:44,821 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [628712129] [2020-08-22 03:09:44,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:44,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:45,220 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:45,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:45,227 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:45,227 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [628712129] [2020-08-22 03:09:45,228 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:45,228 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-22 03:09:45,228 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443719829] [2020-08-22 03:09:45,229 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-22 03:09:45,229 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:45,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-22 03:09:45,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2020-08-22 03:09:45,230 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 15 states. [2020-08-22 03:09:46,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:46,040 INFO L93 Difference]: Finished difference Result 70 states and 78 transitions. [2020-08-22 03:09:46,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-22 03:09:46,040 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 25 [2020-08-22 03:09:46,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:46,043 INFO L225 Difference]: With dead ends: 70 [2020-08-22 03:09:46,043 INFO L226 Difference]: Without dead ends: 68 [2020-08-22 03:09:46,045 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=171, Invalid=759, Unknown=0, NotChecked=0, Total=930 [2020-08-22 03:09:46,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-22 03:09:46,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-08-22 03:09:46,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-22 03:09:46,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-08-22 03:09:46,060 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 25 [2020-08-22 03:09:46,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:46,061 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-08-22 03:09:46,061 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-22 03:09:46,061 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-08-22 03:09:46,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-22 03:09:46,065 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:46,065 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:46,066 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 03:09:46,066 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:46,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:46,066 INFO L82 PathProgramCache]: Analyzing trace with hash 1352039560, now seen corresponding path program 4 times [2020-08-22 03:09:46,067 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:46,067 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1437324338] [2020-08-22 03:09:46,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:46,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:46,180 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:46,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:46,184 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:46,184 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1437324338] [2020-08-22 03:09:46,185 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:46,185 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 03:09:46,185 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904677500] [2020-08-22 03:09:46,186 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 03:09:46,186 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:46,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 03:09:46,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-22 03:09:46,187 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand 8 states. [2020-08-22 03:09:46,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:46,395 INFO L93 Difference]: Finished difference Result 74 states and 83 transitions. [2020-08-22 03:09:46,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-22 03:09:46,396 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-08-22 03:09:46,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:46,398 INFO L225 Difference]: With dead ends: 74 [2020-08-22 03:09:46,398 INFO L226 Difference]: Without dead ends: 63 [2020-08-22 03:09:46,399 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-08-22 03:09:46,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-22 03:09:46,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 48. [2020-08-22 03:09:46,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-22 03:09:46,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2020-08-22 03:09:46,416 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 27 [2020-08-22 03:09:46,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:46,416 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2020-08-22 03:09:46,416 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 03:09:46,417 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2020-08-22 03:09:46,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-22 03:09:46,420 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:46,420 INFO L422 BasicCegarLoop]: trace histogram [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] [2020-08-22 03:09:46,420 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 03:09:46,421 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:46,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:46,422 INFO L82 PathProgramCache]: Analyzing trace with hash -1474600187, now seen corresponding path program 1 times [2020-08-22 03:09:46,422 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:46,423 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1644941958] [2020-08-22 03:09:46,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:46,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:46,521 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:46,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:46,525 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-22 03:09:46,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:46,532 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-22 03:09:46,532 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1644941958] [2020-08-22 03:09:46,533 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:46,533 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 03:09:46,533 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667422211] [2020-08-22 03:09:46,534 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 03:09:46,534 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:46,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 03:09:46,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-22 03:09:46,535 INFO L87 Difference]: Start difference. First operand 48 states and 53 transitions. Second operand 8 states. [2020-08-22 03:09:46,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:46,714 INFO L93 Difference]: Finished difference Result 75 states and 84 transitions. [2020-08-22 03:09:46,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 03:09:46,714 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-08-22 03:09:46,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:46,715 INFO L225 Difference]: With dead ends: 75 [2020-08-22 03:09:46,716 INFO L226 Difference]: Without dead ends: 55 [2020-08-22 03:09:46,716 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-22 03:09:46,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-22 03:09:46,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 47. [2020-08-22 03:09:46,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-22 03:09:46,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2020-08-22 03:09:46,734 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 29 [2020-08-22 03:09:46,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:46,734 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2020-08-22 03:09:46,734 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 03:09:46,734 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2020-08-22 03:09:46,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-22 03:09:46,735 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:46,735 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] [2020-08-22 03:09:46,738 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 03:09:46,739 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:46,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:46,739 INFO L82 PathProgramCache]: Analyzing trace with hash -2035121466, now seen corresponding path program 5 times [2020-08-22 03:09:46,739 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:46,740 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1829168220] [2020-08-22 03:09:46,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:46,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:47,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:47,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:47,175 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:47,175 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1829168220] [2020-08-22 03:09:47,175 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:47,176 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-22 03:09:47,176 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1383202350] [2020-08-22 03:09:47,176 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-22 03:09:47,177 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:47,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-22 03:09:47,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=237, Unknown=0, NotChecked=0, Total=272 [2020-08-22 03:09:47,177 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand 17 states. [2020-08-22 03:09:48,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:48,734 INFO L93 Difference]: Finished difference Result 97 states and 109 transitions. [2020-08-22 03:09:48,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-22 03:09:48,737 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 29 [2020-08-22 03:09:48,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:48,738 INFO L225 Difference]: With dead ends: 97 [2020-08-22 03:09:48,738 INFO L226 Difference]: Without dead ends: 95 [2020-08-22 03:09:48,739 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=250, Invalid=1556, Unknown=0, NotChecked=0, Total=1806 [2020-08-22 03:09:48,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-22 03:09:48,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 52. [2020-08-22 03:09:48,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-22 03:09:48,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 57 transitions. [2020-08-22 03:09:48,749 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 57 transitions. Word has length 29 [2020-08-22 03:09:48,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:48,750 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 57 transitions. [2020-08-22 03:09:48,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-22 03:09:48,750 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 57 transitions. [2020-08-22 03:09:48,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-22 03:09:48,751 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:48,751 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:48,752 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 03:09:48,752 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:48,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:48,752 INFO L82 PathProgramCache]: Analyzing trace with hash 1351725508, now seen corresponding path program 6 times [2020-08-22 03:09:48,752 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:48,753 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [622763127] [2020-08-22 03:09:48,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:48,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:48,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:48,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:48,828 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:48,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [622763127] [2020-08-22 03:09:48,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:48,828 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-22 03:09:48,829 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960267661] [2020-08-22 03:09:48,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 03:09:48,829 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:48,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 03:09:48,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-22 03:09:48,830 INFO L87 Difference]: Start difference. First operand 52 states and 57 transitions. Second operand 9 states. [2020-08-22 03:09:49,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:49,087 INFO L93 Difference]: Finished difference Result 88 states and 99 transitions. [2020-08-22 03:09:49,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-22 03:09:49,088 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-08-22 03:09:49,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:49,092 INFO L225 Difference]: With dead ends: 88 [2020-08-22 03:09:49,092 INFO L226 Difference]: Without dead ends: 77 [2020-08-22 03:09:49,093 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-08-22 03:09:49,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-22 03:09:49,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 54. [2020-08-22 03:09:49,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-22 03:09:49,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 59 transitions. [2020-08-22 03:09:49,104 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 59 transitions. Word has length 31 [2020-08-22 03:09:49,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:49,105 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 59 transitions. [2020-08-22 03:09:49,105 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 03:09:49,105 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 59 transitions. [2020-08-22 03:09:49,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-22 03:09:49,106 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:49,106 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:09:49,106 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-22 03:09:49,107 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:49,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:49,107 INFO L82 PathProgramCache]: Analyzing trace with hash 1316510017, now seen corresponding path program 2 times [2020-08-22 03:09:49,107 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:49,107 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [840042111] [2020-08-22 03:09:49,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:49,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 03:09:49,127 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-22 03:09:49,127 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 03:09:49,132 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-22 03:09:49,151 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 03:09:49 BoogieIcfgContainer [2020-08-22 03:09:49,152 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 03:09:49,154 INFO L168 Benchmark]: Toolchain (without parser) took 7531.08 ms. Allocated memory was 138.9 MB in the beginning and 310.4 MB in the end (delta: 171.4 MB). Free memory was 102.1 MB in the beginning and 251.5 MB in the end (delta: -149.3 MB). Peak memory consumption was 22.1 MB. Max. memory is 7.1 GB. [2020-08-22 03:09:49,155 INFO L168 Benchmark]: CDTParser took 0.74 ms. Allocated memory is still 138.9 MB. Free memory was 120.5 MB in the beginning and 120.2 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-22 03:09:49,156 INFO L168 Benchmark]: CACSL2BoogieTranslator took 274.39 ms. Allocated memory is still 138.9 MB. Free memory was 101.9 MB in the beginning and 91.5 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-08-22 03:09:49,157 INFO L168 Benchmark]: Boogie Preprocessor took 122.22 ms. Allocated memory was 138.9 MB in the beginning and 201.3 MB in the end (delta: 62.4 MB). Free memory was 91.5 MB in the beginning and 178.5 MB in the end (delta: -86.9 MB). Peak memory consumption was 12.6 MB. Max. memory is 7.1 GB. [2020-08-22 03:09:49,158 INFO L168 Benchmark]: RCFGBuilder took 366.50 ms. Allocated memory is still 201.3 MB. Free memory was 178.5 MB in the beginning and 162.0 MB in the end (delta: 16.5 MB). Peak memory consumption was 16.5 MB. Max. memory is 7.1 GB. [2020-08-22 03:09:49,158 INFO L168 Benchmark]: TraceAbstraction took 6762.43 ms. Allocated memory was 201.3 MB in the beginning and 310.4 MB in the end (delta: 109.1 MB). Free memory was 161.3 MB in the beginning and 251.5 MB in the end (delta: -90.2 MB). Peak memory consumption was 18.9 MB. Max. memory is 7.1 GB. [2020-08-22 03:09:49,162 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.74 ms. Allocated memory is still 138.9 MB. Free memory was 120.5 MB in the beginning and 120.2 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 274.39 ms. Allocated memory is still 138.9 MB. Free memory was 101.9 MB in the beginning and 91.5 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 122.22 ms. Allocated memory was 138.9 MB in the beginning and 201.3 MB in the end (delta: 62.4 MB). Free memory was 91.5 MB in the beginning and 178.5 MB in the end (delta: -86.9 MB). Peak memory consumption was 12.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 366.50 ms. Allocated memory is still 201.3 MB. Free memory was 178.5 MB in the beginning and 162.0 MB in the end (delta: 16.5 MB). Peak memory consumption was 16.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 6762.43 ms. Allocated memory was 201.3 MB in the beginning and 310.4 MB in the end (delta: 109.1 MB). Free memory was 161.3 MB in the beginning and 251.5 MB in the end (delta: -90.2 MB). Peak memory consumption was 18.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 6]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L14] int MAX = __VERIFIER_nondet_uint(); [L15] COND FALSE !(!(MAX > 0)) [L16] char str1[MAX], str2[MAX]; [L17] int cont, i, j; [L18] cont = 0 [L20] i=0 [L20] COND TRUE i= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND TRUE i >= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND FALSE !(i >= 0) [L32] j = MAX-1 [L33] i=0 [L33] COND TRUE i