/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=0.2 --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 03:58:11,345 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 03:58:11,348 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 03:58:11,394 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 03:58:11,396 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 03:58:11,407 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 03:58:11,410 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 03:58:11,413 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 03:58:11,414 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 03:58:11,414 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 03:58:11,416 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 03:58:11,418 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 03:58:11,419 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 03:58:11,422 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 03:58:11,423 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 03:58:11,425 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 03:58:11,427 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 03:58:11,429 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 03:58:11,432 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 03:58:11,439 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 03:58:11,441 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 03:58:11,443 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 03:58:11,445 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 03:58:11,446 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 03:58:11,450 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-22 03:58:11,450 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-22 03:58:11,450 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-22 03:58:11,453 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-22 03:58:11,454 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-22 03:58:11,455 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-22 03:58:11,460 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 03:58:11,461 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 03:58:11,463 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 03:58:11,463 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 03:58:11,511 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 03:58:11,511 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 03:58:11,513 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 03:58:11,514 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 03:58:11,514 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 03:58:11,514 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 03:58:11,515 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 03:58:11,515 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 03:58:11,515 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 03:58:11,515 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 03:58:11,516 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 03:58:11,517 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 03:58:11,517 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 03:58:11,517 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 03:58:11,518 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 03:58:11,518 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 03:58:11,518 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 03:58:11,518 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 03:58:11,518 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 03:58:11,519 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 03:58:11,519 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 03:58:11,519 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 03:58:11,519 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 03:58:11,519 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 03:58:11,520 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 03:58:11,520 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 03:58:11,520 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 03:58:11,520 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 03:58:11,520 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 03:58:11,521 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=0.2;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=0.2;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=0.2;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=0.2;log-additional-information=true; [2020-08-22 03:58:11,825 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 03:58:11,838 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 03:58:11,842 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 03:58:11,844 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 03:58:11,844 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 03:58:11,845 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2020-08-22 03:58:11,927 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/cc0c5c4fd/fc6f711beab54670aedb07999062c444/FLAG5f71dd463 [2020-08-22 03:58:12,417 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 03:58:12,418 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/invert_string-1.c [2020-08-22 03:58:12,423 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/cc0c5c4fd/fc6f711beab54670aedb07999062c444/FLAG5f71dd463 [2020-08-22 03:58:12,828 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/cc0c5c4fd/fc6f711beab54670aedb07999062c444 [2020-08-22 03:58:12,836 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 03:58:12,837 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 03:58:12,839 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 03:58:12,839 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 03:58:12,843 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 03:58:12,845 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 03:58:12" (1/1) ... [2020-08-22 03:58:12,848 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5d16da1a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:58:12, skipping insertion in model container [2020-08-22 03:58:12,848 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 03:58:12" (1/1) ... [2020-08-22 03:58:12,857 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 03:58:12,875 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 03:58:13,041 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 03:58:13,047 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 03:58:13,069 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 03:58:13,087 INFO L208 MainTranslator]: Completed translation [2020-08-22 03:58:13,088 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:58:13 WrapperNode [2020-08-22 03:58:13,088 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 03:58:13,089 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 03:58:13,089 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 03:58:13,089 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 03:58:13,179 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:58:13" (1/1) ... [2020-08-22 03:58:13,180 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:58:13" (1/1) ... [2020-08-22 03:58:13,188 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:58:13" (1/1) ... [2020-08-22 03:58:13,188 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:58:13" (1/1) ... [2020-08-22 03:58:13,200 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:58:13" (1/1) ... [2020-08-22 03:58:13,213 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:58:13" (1/1) ... [2020-08-22 03:58:13,215 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:58:13" (1/1) ... [2020-08-22 03:58:13,218 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 03:58:13,219 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 03:58:13,219 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 03:58:13,219 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 03:58:13,220 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:58:13" (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 03:58:13,285 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 03:58:13,286 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 03:58:13,286 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 03:58:13,286 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 03:58:13,287 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 03:58:13,287 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-22 03:58:13,287 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 03:58:13,287 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-22 03:58:13,287 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-08-22 03:58:13,288 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 03:58:13,289 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-22 03:58:13,289 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-22 03:58:13,289 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-22 03:58:13,289 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-22 03:58:13,289 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 03:58:13,290 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 03:58:13,566 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 03:58:13,566 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-22 03:58:13,570 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 03:58:13 BoogieIcfgContainer [2020-08-22 03:58:13,570 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 03:58:13,572 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 03:58:13,573 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 03:58:13,576 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 03:58:13,576 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 03:58:12" (1/3) ... [2020-08-22 03:58:13,577 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57694d79 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 03:58:13, skipping insertion in model container [2020-08-22 03:58:13,578 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:58:13" (2/3) ... [2020-08-22 03:58:13,579 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57694d79 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 03:58:13, skipping insertion in model container [2020-08-22 03:58:13,579 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 03:58:13" (3/3) ... [2020-08-22 03:58:13,581 INFO L109 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-08-22 03:58:13,595 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 03:58:13,603 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 03:58:13,621 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 03:58:13,649 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 03:58:13,649 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 03:58:13,649 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 03:58:13,650 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 03:58:13,650 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 03:58:13,650 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 03:58:13,650 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 03:58:13,650 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 03:58:13,680 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-08-22 03:58:13,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-22 03:58:13,692 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:58:13,696 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 03:58:13,697 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:58:13,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:58:13,711 INFO L82 PathProgramCache]: Analyzing trace with hash -474003824, now seen corresponding path program 1 times [2020-08-22 03:58:13,723 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:58:13,723 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [677534736] [2020-08-22 03:58:13,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:58:13,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:58:13,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:58:13,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:58:13,904 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 03:58:13,905 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [677534736] [2020-08-22 03:58:13,907 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 03:58:13,908 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 03:58:13,909 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [52165331] [2020-08-22 03:58:13,914 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 03:58:13,915 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:58:13,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 03:58:13,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 03:58:13,934 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 3 states. [2020-08-22 03:58:14,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:58:14,033 INFO L93 Difference]: Finished difference Result 51 states and 65 transitions. [2020-08-22 03:58:14,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 03:58:14,035 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-22 03:58:14,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:58:14,045 INFO L225 Difference]: With dead ends: 51 [2020-08-22 03:58:14,046 INFO L226 Difference]: Without dead ends: 24 [2020-08-22 03:58:14,050 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 03:58:14,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-22 03:58:14,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-22 03:58:14,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-22 03:58:14,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-22 03:58:14,108 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2020-08-22 03:58:14,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:58:14,109 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-22 03:58:14,109 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 03:58:14,109 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-22 03:58:14,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-22 03:58:14,110 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:58:14,110 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 03:58:14,111 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 03:58:14,111 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:58:14,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:58:14,112 INFO L82 PathProgramCache]: Analyzing trace with hash 227060754, now seen corresponding path program 1 times [2020-08-22 03:58:14,112 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:58:14,112 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1425350208] [2020-08-22 03:58:14,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:58:14,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:58:14,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:58:14,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:58:14,236 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 03:58:14,237 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1425350208] [2020-08-22 03:58:14,237 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 03:58:14,237 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 03:58:14,238 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [314123222] [2020-08-22 03:58:14,240 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 03:58:14,240 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:58:14,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 03:58:14,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-22 03:58:14,241 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 5 states. [2020-08-22 03:58:14,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:58:14,378 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2020-08-22 03:58:14,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 03:58:14,379 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-22 03:58:14,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:58:14,381 INFO L225 Difference]: With dead ends: 44 [2020-08-22 03:58:14,382 INFO L226 Difference]: Without dead ends: 30 [2020-08-22 03:58:14,383 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 03:58:14,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-22 03:58:14,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-08-22 03:58:14,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-22 03:58:14,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2020-08-22 03:58:14,396 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2020-08-22 03:58:14,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:58:14,396 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2020-08-22 03:58:14,396 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 03:58:14,396 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2020-08-22 03:58:14,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-22 03:58:14,397 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:58:14,397 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 03:58:14,398 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 03:58:14,398 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:58:14,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:58:14,398 INFO L82 PathProgramCache]: Analyzing trace with hash -714610672, now seen corresponding path program 1 times [2020-08-22 03:58:14,399 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:58:14,399 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [86977802] [2020-08-22 03:58:14,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:58:14,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:58:14,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:58:14,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:58:14,507 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 03:58:14,508 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [86977802] [2020-08-22 03:58:14,508 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 03:58:14,508 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 03:58:14,509 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2035935438] [2020-08-22 03:58:14,509 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 03:58:14,509 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:58:14,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 03:58:14,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 03:58:14,510 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 5 states. [2020-08-22 03:58:14,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:58:14,616 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2020-08-22 03:58:14,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 03:58:14,617 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-08-22 03:58:14,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:58:14,618 INFO L225 Difference]: With dead ends: 37 [2020-08-22 03:58:14,618 INFO L226 Difference]: Without dead ends: 26 [2020-08-22 03:58:14,619 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 03:58:14,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-22 03:58:14,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-22 03:58:14,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-22 03:58:14,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-22 03:58:14,627 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2020-08-22 03:58:14,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:58:14,627 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-22 03:58:14,627 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 03:58:14,628 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-22 03:58:14,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-22 03:58:14,629 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:58:14,629 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 03:58:14,629 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 03:58:14,629 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:58:14,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:58:14,630 INFO L82 PathProgramCache]: Analyzing trace with hash 483863630, now seen corresponding path program 1 times [2020-08-22 03:58:14,630 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:58:14,631 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [769872109] [2020-08-22 03:58:14,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:58:14,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:58:15,088 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:58:15,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:58:15,095 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 03:58:15,095 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [769872109] [2020-08-22 03:58:15,095 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:58:15,096 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-22 03:58:15,096 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871747842] [2020-08-22 03:58:15,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 03:58:15,097 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:58:15,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 03:58:15,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2020-08-22 03:58:15,098 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 13 states. [2020-08-22 03:58:15,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:58:15,576 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-22 03:58:15,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-22 03:58:15,576 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 21 [2020-08-22 03:58:15,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:58:15,578 INFO L225 Difference]: With dead ends: 50 [2020-08-22 03:58:15,578 INFO L226 Difference]: Without dead ends: 48 [2020-08-22 03:58:15,579 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 03:58:15,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-22 03:58:15,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 39. [2020-08-22 03:58:15,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-22 03:58:15,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-22 03:58:15,590 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 21 [2020-08-22 03:58:15,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:58:15,590 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-22 03:58:15,590 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 03:58:15,591 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-22 03:58:15,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-22 03:58:15,592 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:58:15,592 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 03:58:15,592 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 03:58:15,592 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:58:15,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:58:15,593 INFO L82 PathProgramCache]: Analyzing trace with hash 714881356, now seen corresponding path program 2 times [2020-08-22 03:58:15,593 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:58:15,593 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [374636599] [2020-08-22 03:58:15,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:58:15,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:58:15,677 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:58:15,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:58:15,684 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 03:58:15,684 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [374636599] [2020-08-22 03:58:15,685 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:58:15,685 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 03:58:15,685 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [868242886] [2020-08-22 03:58:15,686 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 03:58:15,687 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:58:15,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 03:58:15,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-08-22 03:58:15,688 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 7 states. [2020-08-22 03:58:15,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:58:15,884 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2020-08-22 03:58:15,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 03:58:15,884 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2020-08-22 03:58:15,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:58:15,885 INFO L225 Difference]: With dead ends: 59 [2020-08-22 03:58:15,886 INFO L226 Difference]: Without dead ends: 48 [2020-08-22 03:58:15,887 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 03:58:15,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-22 03:58:15,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2020-08-22 03:58:15,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-22 03:58:15,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-22 03:58:15,898 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 23 [2020-08-22 03:58:15,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:58:15,898 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-22 03:58:15,898 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 03:58:15,899 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-22 03:58:15,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-22 03:58:15,899 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:58:15,900 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 03:58:15,900 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 03:58:15,900 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:58:15,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:58:15,901 INFO L82 PathProgramCache]: Analyzing trace with hash -163832182, now seen corresponding path program 3 times [2020-08-22 03:58:15,901 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:58:15,901 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1176987548] [2020-08-22 03:58:15,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:58:15,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:58:16,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:58:16,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:58:16,310 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 03:58:16,310 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1176987548] [2020-08-22 03:58:16,311 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:58:16,311 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-22 03:58:16,311 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172998075] [2020-08-22 03:58:16,312 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-22 03:58:16,312 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:58:16,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-22 03:58:16,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2020-08-22 03:58:16,313 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 15 states. [2020-08-22 03:58:17,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:58:17,132 INFO L93 Difference]: Finished difference Result 70 states and 78 transitions. [2020-08-22 03:58:17,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-22 03:58:17,133 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 25 [2020-08-22 03:58:17,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:58:17,136 INFO L225 Difference]: With dead ends: 70 [2020-08-22 03:58:17,137 INFO L226 Difference]: Without dead ends: 68 [2020-08-22 03:58:17,138 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 03:58:17,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-22 03:58:17,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-08-22 03:58:17,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-22 03:58:17,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-08-22 03:58:17,147 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 25 [2020-08-22 03:58:17,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:58:17,148 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-08-22 03:58:17,148 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-22 03:58:17,148 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-08-22 03:58:17,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-22 03:58:17,149 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:58:17,149 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 03:58:17,149 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 03:58:17,149 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:58:17,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:58:17,150 INFO L82 PathProgramCache]: Analyzing trace with hash 1352039560, now seen corresponding path program 4 times [2020-08-22 03:58:17,150 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:58:17,150 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1799984198] [2020-08-22 03:58:17,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:58:17,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:58:17,215 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:58:17,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:58:17,222 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 03:58:17,223 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1799984198] [2020-08-22 03:58:17,223 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:58:17,223 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 03:58:17,225 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490514210] [2020-08-22 03:58:17,226 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 03:58:17,226 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:58:17,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 03:58:17,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-22 03:58:17,227 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand 8 states. [2020-08-22 03:58:17,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:58:17,433 INFO L93 Difference]: Finished difference Result 74 states and 83 transitions. [2020-08-22 03:58:17,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-22 03:58:17,433 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-08-22 03:58:17,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:58:17,435 INFO L225 Difference]: With dead ends: 74 [2020-08-22 03:58:17,435 INFO L226 Difference]: Without dead ends: 63 [2020-08-22 03:58:17,435 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 03:58:17,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-22 03:58:17,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 48. [2020-08-22 03:58:17,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-22 03:58:17,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2020-08-22 03:58:17,445 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 27 [2020-08-22 03:58:17,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:58:17,445 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2020-08-22 03:58:17,445 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 03:58:17,445 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2020-08-22 03:58:17,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-22 03:58:17,446 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:58:17,447 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 03:58:17,447 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 03:58:17,447 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:58:17,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:58:17,448 INFO L82 PathProgramCache]: Analyzing trace with hash -1474600187, now seen corresponding path program 1 times [2020-08-22 03:58:17,448 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:58:17,448 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [652360221] [2020-08-22 03:58:17,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:58:17,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:58:17,519 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:58:17,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:58:17,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-22 03:58:17,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:58:17,528 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 03:58:17,528 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [652360221] [2020-08-22 03:58:17,528 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:58:17,528 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 03:58:17,529 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1487871409] [2020-08-22 03:58:17,529 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 03:58:17,529 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:58:17,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 03:58:17,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-22 03:58:17,530 INFO L87 Difference]: Start difference. First operand 48 states and 53 transitions. Second operand 8 states. [2020-08-22 03:58:17,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:58:17,673 INFO L93 Difference]: Finished difference Result 75 states and 84 transitions. [2020-08-22 03:58:17,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 03:58:17,674 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-08-22 03:58:17,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:58:17,675 INFO L225 Difference]: With dead ends: 75 [2020-08-22 03:58:17,675 INFO L226 Difference]: Without dead ends: 55 [2020-08-22 03:58:17,676 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 03:58:17,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-22 03:58:17,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 47. [2020-08-22 03:58:17,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-22 03:58:17,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2020-08-22 03:58:17,694 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 29 [2020-08-22 03:58:17,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:58:17,695 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2020-08-22 03:58:17,695 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 03:58:17,695 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2020-08-22 03:58:17,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-22 03:58:17,699 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:58:17,699 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 03:58:17,699 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 03:58:17,699 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:58:17,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:58:17,700 INFO L82 PathProgramCache]: Analyzing trace with hash -2035121466, now seen corresponding path program 5 times [2020-08-22 03:58:17,700 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:58:17,700 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1986317822] [2020-08-22 03:58:17,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:58:17,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:58:18,091 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:58:18,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:58:18,098 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 03:58:18,099 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1986317822] [2020-08-22 03:58:18,099 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:58:18,099 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-22 03:58:18,099 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020901779] [2020-08-22 03:58:18,100 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-22 03:58:18,100 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:58:18,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-22 03:58:18,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=237, Unknown=0, NotChecked=0, Total=272 [2020-08-22 03:58:18,101 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand 17 states. [2020-08-22 03:58:19,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:58:19,632 INFO L93 Difference]: Finished difference Result 97 states and 109 transitions. [2020-08-22 03:58:19,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-22 03:58:19,633 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 29 [2020-08-22 03:58:19,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:58:19,634 INFO L225 Difference]: With dead ends: 97 [2020-08-22 03:58:19,634 INFO L226 Difference]: Without dead ends: 95 [2020-08-22 03:58:19,636 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 03:58:19,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-22 03:58:19,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 52. [2020-08-22 03:58:19,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-22 03:58:19,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 57 transitions. [2020-08-22 03:58:19,646 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 57 transitions. Word has length 29 [2020-08-22 03:58:19,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:58:19,646 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 57 transitions. [2020-08-22 03:58:19,647 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-22 03:58:19,647 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 57 transitions. [2020-08-22 03:58:19,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-22 03:58:19,648 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:58:19,648 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 03:58:19,648 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 03:58:19,648 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:58:19,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:58:19,649 INFO L82 PathProgramCache]: Analyzing trace with hash 1351725508, now seen corresponding path program 6 times [2020-08-22 03:58:19,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:58:19,649 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [661529029] [2020-08-22 03:58:19,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:58:19,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:58:19,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:58:19,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:58:19,720 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 03:58:19,721 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [661529029] [2020-08-22 03:58:19,721 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:58:19,721 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-22 03:58:19,721 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461100731] [2020-08-22 03:58:19,722 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 03:58:19,722 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:58:19,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 03:58:19,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-22 03:58:19,723 INFO L87 Difference]: Start difference. First operand 52 states and 57 transitions. Second operand 9 states. [2020-08-22 03:58:19,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:58:19,957 INFO L93 Difference]: Finished difference Result 88 states and 99 transitions. [2020-08-22 03:58:19,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-22 03:58:19,958 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-08-22 03:58:19,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:58:19,959 INFO L225 Difference]: With dead ends: 88 [2020-08-22 03:58:19,959 INFO L226 Difference]: Without dead ends: 77 [2020-08-22 03:58:19,960 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 03:58:19,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-22 03:58:19,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 54. [2020-08-22 03:58:19,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-22 03:58:19,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 59 transitions. [2020-08-22 03:58:19,978 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 59 transitions. Word has length 31 [2020-08-22 03:58:19,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:58:19,978 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 59 transitions. [2020-08-22 03:58:19,978 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 03:58:19,978 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 59 transitions. [2020-08-22 03:58:19,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-22 03:58:19,980 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:58:19,980 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 03:58:19,982 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-22 03:58:19,982 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:58:19,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:58:19,982 INFO L82 PathProgramCache]: Analyzing trace with hash 1316510017, now seen corresponding path program 2 times [2020-08-22 03:58:19,983 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:58:19,983 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [962132565] [2020-08-22 03:58:19,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:58:20,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 03:58:20,005 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-22 03:58:20,005 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 03:58:20,009 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-22 03:58:20,028 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 03:58:20 BoogieIcfgContainer [2020-08-22 03:58:20,029 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 03:58:20,031 INFO L168 Benchmark]: Toolchain (without parser) took 7193.30 ms. Allocated memory was 141.0 MB in the beginning and 293.1 MB in the end (delta: 152.0 MB). Free memory was 102.1 MB in the beginning and 164.0 MB in the end (delta: -61.9 MB). Peak memory consumption was 90.1 MB. Max. memory is 7.1 GB. [2020-08-22 03:58:20,032 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 141.0 MB. Free memory was 121.3 MB in the beginning and 120.9 MB in the end (delta: 419.5 kB). Peak memory consumption was 419.5 kB. Max. memory is 7.1 GB. [2020-08-22 03:58:20,033 INFO L168 Benchmark]: CACSL2BoogieTranslator took 249.67 ms. Allocated memory is still 141.0 MB. Free memory was 102.1 MB in the beginning and 91.6 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-08-22 03:58:20,034 INFO L168 Benchmark]: Boogie Preprocessor took 129.64 ms. Allocated memory was 141.0 MB in the beginning and 203.9 MB in the end (delta: 62.9 MB). Free memory was 91.6 MB in the beginning and 181.4 MB in the end (delta: -89.8 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. [2020-08-22 03:58:20,035 INFO L168 Benchmark]: RCFGBuilder took 351.91 ms. Allocated memory is still 203.9 MB. Free memory was 181.4 MB in the beginning and 164.6 MB in the end (delta: 16.8 MB). Peak memory consumption was 16.8 MB. Max. memory is 7.1 GB. [2020-08-22 03:58:20,036 INFO L168 Benchmark]: TraceAbstraction took 6456.34 ms. Allocated memory was 203.9 MB in the beginning and 293.1 MB in the end (delta: 89.1 MB). Free memory was 164.6 MB in the beginning and 164.0 MB in the end (delta: 622.4 kB). Peak memory consumption was 89.8 MB. Max. memory is 7.1 GB. [2020-08-22 03:58:20,039 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 141.0 MB. Free memory was 121.3 MB in the beginning and 120.9 MB in the end (delta: 419.5 kB). Peak memory consumption was 419.5 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 249.67 ms. Allocated memory is still 141.0 MB. Free memory was 102.1 MB in the beginning and 91.6 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 129.64 ms. Allocated memory was 141.0 MB in the beginning and 203.9 MB in the end (delta: 62.9 MB). Free memory was 91.6 MB in the beginning and 181.4 MB in the end (delta: -89.8 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 351.91 ms. Allocated memory is still 203.9 MB. Free memory was 181.4 MB in the beginning and 164.6 MB in the end (delta: 16.8 MB). Peak memory consumption was 16.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 6456.34 ms. Allocated memory was 203.9 MB in the beginning and 293.1 MB in the end (delta: 89.1 MB). Free memory was 164.6 MB in the beginning and 164.0 MB in the end (delta: 622.4 kB). Peak memory consumption was 89.8 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