/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain IntervalDomain -i ../sv-benchmarks/c/array-multidimensional/copy-2-u.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-03-31 20:51:52,452 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-03-31 20:51:52,453 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-03-31 20:51:52,486 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-03-31 20:51:52,486 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-03-31 20:51:52,490 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-03-31 20:51:52,493 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-03-31 20:51:52,495 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-03-31 20:51:52,496 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-03-31 20:51:52,501 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-03-31 20:51:52,501 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-03-31 20:51:52,502 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-03-31 20:51:52,502 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-03-31 20:51:52,503 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-03-31 20:51:52,504 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-03-31 20:51:52,504 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-03-31 20:51:52,505 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-03-31 20:51:52,505 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-03-31 20:51:52,506 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-03-31 20:51:52,508 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-03-31 20:51:52,509 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-03-31 20:51:52,512 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-03-31 20:51:52,513 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-03-31 20:51:52,515 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-03-31 20:51:52,523 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-03-31 20:51:52,523 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-03-31 20:51:52,523 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-03-31 20:51:52,524 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-03-31 20:51:52,525 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-03-31 20:51:52,525 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-03-31 20:51:52,526 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-03-31 20:51:52,526 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-03-31 20:51:52,527 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-03-31 20:51:52,527 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-03-31 20:51:52,528 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-03-31 20:51:52,528 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-03-31 20:51:52,528 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-03-31 20:51:52,528 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-03-31 20:51:52,529 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-03-31 20:51:52,529 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-03-31 20:51:52,530 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-03-31 20:51:52,531 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-03-31 20:51:52,563 INFO L113 SettingsManager]: Loading preferences was successful [2023-03-31 20:51:52,563 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-03-31 20:51:52,564 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-03-31 20:51:52,564 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-03-31 20:51:52,565 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-03-31 20:51:52,565 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-03-31 20:51:52,565 INFO L138 SettingsManager]: * User list type=DISABLED [2023-03-31 20:51:52,565 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-03-31 20:51:52,565 INFO L138 SettingsManager]: * Explicit value domain=true [2023-03-31 20:51:52,565 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-03-31 20:51:52,566 INFO L138 SettingsManager]: * Octagon Domain=false [2023-03-31 20:51:52,566 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-03-31 20:51:52,566 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-03-31 20:51:52,566 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-03-31 20:51:52,566 INFO L138 SettingsManager]: * Interval Domain=false [2023-03-31 20:51:52,566 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-03-31 20:51:52,566 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-03-31 20:51:52,567 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-03-31 20:51:52,567 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-03-31 20:51:52,567 INFO L138 SettingsManager]: * sizeof long=4 [2023-03-31 20:51:52,567 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-03-31 20:51:52,567 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-03-31 20:51:52,567 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-03-31 20:51:52,567 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-03-31 20:51:52,568 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-03-31 20:51:52,568 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-03-31 20:51:52,568 INFO L138 SettingsManager]: * sizeof long double=12 [2023-03-31 20:51:52,568 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-03-31 20:51:52,568 INFO L138 SettingsManager]: * Use constant arrays=true [2023-03-31 20:51:52,568 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-03-31 20:51:52,568 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-03-31 20:51:52,569 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-03-31 20:51:52,569 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 20:51:52,569 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-03-31 20:51:52,569 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-03-31 20:51:52,569 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-03-31 20:51:52,569 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-03-31 20:51:52,569 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-03-31 20:51:52,569 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-03-31 20:51:52,569 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-03-31 20:51:52,569 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-03-31 20:51:52,570 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> IntervalDomain [2023-03-31 20:51:52,742 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-03-31 20:51:52,761 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-03-31 20:51:52,763 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-03-31 20:51:52,763 INFO L271 PluginConnector]: Initializing CDTParser... [2023-03-31 20:51:52,764 INFO L275 PluginConnector]: CDTParser initialized [2023-03-31 20:51:52,765 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-multidimensional/copy-2-u.c [2023-03-31 20:51:53,899 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-03-31 20:51:54,045 INFO L351 CDTParser]: Found 1 translation units. [2023-03-31 20:51:54,045 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-multidimensional/copy-2-u.c [2023-03-31 20:51:54,049 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3acbdb2bb/fd2744c221374c32b47ecd81a025284d/FLAGbc5613625 [2023-03-31 20:51:54,063 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3acbdb2bb/fd2744c221374c32b47ecd81a025284d [2023-03-31 20:51:54,066 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-03-31 20:51:54,067 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-03-31 20:51:54,068 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-03-31 20:51:54,068 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-03-31 20:51:54,070 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-03-31 20:51:54,070 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 08:51:54" (1/1) ... [2023-03-31 20:51:54,071 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@59d9efcc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:54, skipping insertion in model container [2023-03-31 20:51:54,071 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 08:51:54" (1/1) ... [2023-03-31 20:51:54,081 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-03-31 20:51:54,091 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-03-31 20:51:54,189 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-multidimensional/copy-2-u.c[320,333] [2023-03-31 20:51:54,208 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 20:51:54,215 INFO L203 MainTranslator]: Completed pre-run [2023-03-31 20:51:54,224 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-multidimensional/copy-2-u.c[320,333] [2023-03-31 20:51:54,231 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 20:51:54,241 INFO L208 MainTranslator]: Completed translation [2023-03-31 20:51:54,242 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:54 WrapperNode [2023-03-31 20:51:54,242 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-03-31 20:51:54,243 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-03-31 20:51:54,243 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-03-31 20:51:54,243 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-03-31 20:51:54,252 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:54" (1/1) ... [2023-03-31 20:51:54,252 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:54" (1/1) ... [2023-03-31 20:51:54,258 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:54" (1/1) ... [2023-03-31 20:51:54,259 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:54" (1/1) ... [2023-03-31 20:51:54,262 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:54" (1/1) ... [2023-03-31 20:51:54,265 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:54" (1/1) ... [2023-03-31 20:51:54,266 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:54" (1/1) ... [2023-03-31 20:51:54,266 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:54" (1/1) ... [2023-03-31 20:51:54,267 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-03-31 20:51:54,268 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-03-31 20:51:54,268 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-03-31 20:51:54,268 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-03-31 20:51:54,269 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:54" (1/1) ... [2023-03-31 20:51:54,276 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 20:51:54,285 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:54,299 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-03-31 20:51:54,301 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-03-31 20:51:54,324 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-03-31 20:51:54,324 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-03-31 20:51:54,324 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-03-31 20:51:54,324 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-03-31 20:51:54,324 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-03-31 20:51:54,325 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-03-31 20:51:54,325 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-03-31 20:51:54,325 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-03-31 20:51:54,325 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-03-31 20:51:54,325 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-03-31 20:51:54,325 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-03-31 20:51:54,325 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-03-31 20:51:54,325 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-03-31 20:51:54,325 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-03-31 20:51:54,325 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-03-31 20:51:54,325 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-03-31 20:51:54,326 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-03-31 20:51:54,326 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-03-31 20:51:54,326 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-03-31 20:51:54,378 INFO L236 CfgBuilder]: Building ICFG [2023-03-31 20:51:54,379 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-03-31 20:51:54,494 INFO L277 CfgBuilder]: Performing block encoding [2023-03-31 20:51:54,522 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-03-31 20:51:54,522 INFO L302 CfgBuilder]: Removed 6 assume(true) statements. [2023-03-31 20:51:54,524 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 08:51:54 BoogieIcfgContainer [2023-03-31 20:51:54,524 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-03-31 20:51:54,525 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-03-31 20:51:54,525 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-03-31 20:51:54,527 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-03-31 20:51:54,527 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.03 08:51:54" (1/3) ... [2023-03-31 20:51:54,528 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53e15bdc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 08:51:54, skipping insertion in model container [2023-03-31 20:51:54,528 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:54" (2/3) ... [2023-03-31 20:51:54,528 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53e15bdc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 08:51:54, skipping insertion in model container [2023-03-31 20:51:54,528 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 08:51:54" (3/3) ... [2023-03-31 20:51:54,529 INFO L112 eAbstractionObserver]: Analyzing ICFG copy-2-u.c [2023-03-31 20:51:54,540 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-03-31 20:51:54,540 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-03-31 20:51:54,570 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-03-31 20:51:54,576 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@38cb7a82, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-03-31 20:51:54,576 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-03-31 20:51:54,579 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 15 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 20:51:54,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-03-31 20:51:54,584 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:54,584 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:54,585 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:54,588 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:54,589 INFO L85 PathProgramCache]: Analyzing trace with hash -1863483530, now seen corresponding path program 1 times [2023-03-31 20:51:54,595 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:54,596 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [454755153] [2023-03-31 20:51:54,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:54,596 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:54,665 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 20:51:54,666 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1280802063] [2023-03-31 20:51:54,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:54,666 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:54,666 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:54,675 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 20:51:54,676 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-03-31 20:51:54,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:54,794 INFO L262 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 3 conjunts are in the unsatisfiable core [2023-03-31 20:51:54,798 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:51:54,858 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 20:51:54,858 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-03-31 20:51:54,859 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:54,859 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [454755153] [2023-03-31 20:51:54,859 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 20:51:54,859 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1280802063] [2023-03-31 20:51:54,860 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1280802063] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 20:51:54,860 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 20:51:54,860 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-03-31 20:51:54,861 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66016530] [2023-03-31 20:51:54,863 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 20:51:54,867 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-03-31 20:51:54,867 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:54,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-03-31 20:51:54,889 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 20:51:54,890 INFO L87 Difference]: Start difference. First operand has 22 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 15 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:54,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:54,935 INFO L93 Difference]: Finished difference Result 39 states and 52 transitions. [2023-03-31 20:51:54,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-03-31 20:51:54,937 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2023-03-31 20:51:54,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:54,941 INFO L225 Difference]: With dead ends: 39 [2023-03-31 20:51:54,941 INFO L226 Difference]: Without dead ends: 21 [2023-03-31 20:51:54,943 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 20:51:54,946 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 2 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:54,947 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 31 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 20:51:54,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-03-31 20:51:54,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2023-03-31 20:51:54,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 14 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-03-31 20:51:54,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 25 transitions. [2023-03-31 20:51:54,972 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 25 transitions. Word has length 13 [2023-03-31 20:51:54,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:54,973 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 25 transitions. [2023-03-31 20:51:54,973 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:54,973 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 25 transitions. [2023-03-31 20:51:54,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-03-31 20:51:54,974 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:54,974 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:54,987 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-03-31 20:51:55,179 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-03-31 20:51:55,180 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:55,181 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:55,181 INFO L85 PathProgramCache]: Analyzing trace with hash 695539649, now seen corresponding path program 1 times [2023-03-31 20:51:55,181 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:55,181 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1787018336] [2023-03-31 20:51:55,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:55,182 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:55,202 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 20:51:55,202 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1740472758] [2023-03-31 20:51:55,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:55,202 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:55,202 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:55,205 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 20:51:55,206 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-03-31 20:51:55,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:55,272 INFO L262 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 3 conjunts are in the unsatisfiable core [2023-03-31 20:51:55,273 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:51:55,297 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 20:51:55,297 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-03-31 20:51:55,297 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:55,297 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1787018336] [2023-03-31 20:51:55,297 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 20:51:55,298 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1740472758] [2023-03-31 20:51:55,298 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1740472758] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 20:51:55,298 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 20:51:55,298 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-03-31 20:51:55,298 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601148320] [2023-03-31 20:51:55,298 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 20:51:55,299 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-03-31 20:51:55,299 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:55,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-03-31 20:51:55,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-03-31 20:51:55,300 INFO L87 Difference]: Start difference. First operand 20 states and 25 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:55,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:55,358 INFO L93 Difference]: Finished difference Result 41 states and 56 transitions. [2023-03-31 20:51:55,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-03-31 20:51:55,359 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2023-03-31 20:51:55,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:55,360 INFO L225 Difference]: With dead ends: 41 [2023-03-31 20:51:55,360 INFO L226 Difference]: Without dead ends: 27 [2023-03-31 20:51:55,361 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-03-31 20:51:55,364 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 11 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:55,365 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 29 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 20:51:55,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-03-31 20:51:55,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 23. [2023-03-31 20:51:55,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 17 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-03-31 20:51:55,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 28 transitions. [2023-03-31 20:51:55,374 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 28 transitions. Word has length 15 [2023-03-31 20:51:55,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:55,375 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 28 transitions. [2023-03-31 20:51:55,375 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:55,375 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 28 transitions. [2023-03-31 20:51:55,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-03-31 20:51:55,376 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:55,376 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:55,381 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-03-31 20:51:55,581 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-03-31 20:51:55,582 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:55,582 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:55,582 INFO L85 PathProgramCache]: Analyzing trace with hash -623545937, now seen corresponding path program 1 times [2023-03-31 20:51:55,582 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:55,582 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1827353169] [2023-03-31 20:51:55,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:55,583 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:55,598 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 20:51:55,599 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1210122931] [2023-03-31 20:51:55,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:55,599 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:55,599 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:55,604 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 20:51:55,605 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-03-31 20:51:55,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:55,650 INFO L262 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 4 conjunts are in the unsatisfiable core [2023-03-31 20:51:55,652 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:51:55,686 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 20:51:55,686 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:51:55,715 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 20:51:55,715 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:55,716 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1827353169] [2023-03-31 20:51:55,716 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 20:51:55,716 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1210122931] [2023-03-31 20:51:55,716 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1210122931] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:51:55,716 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [384318018] [2023-03-31 20:51:55,731 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-03-31 20:51:55,732 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:51:55,735 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:51:55,740 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:51:55,741 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:51:55,826 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 20:51:55,992 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 20:51:55,999 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:51:56,123 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [384318018] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 20:51:56,123 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-03-31 20:51:56,123 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [5, 5] total 15 [2023-03-31 20:51:56,124 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415383484] [2023-03-31 20:51:56,124 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 20:51:56,124 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-03-31 20:51:56,124 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:56,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-03-31 20:51:56,125 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2023-03-31 20:51:56,125 INFO L87 Difference]: Start difference. First operand 23 states and 28 transitions. Second operand has 9 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:56,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:56,504 INFO L93 Difference]: Finished difference Result 41 states and 49 transitions. [2023-03-31 20:51:56,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-03-31 20:51:56,504 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2023-03-31 20:51:56,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:56,506 INFO L225 Difference]: With dead ends: 41 [2023-03-31 20:51:56,506 INFO L226 Difference]: Without dead ends: 30 [2023-03-31 20:51:56,507 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=122, Invalid=340, Unknown=0, NotChecked=0, Total=462 [2023-03-31 20:51:56,511 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 41 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:56,515 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 6 Invalid, 118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 20:51:56,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-03-31 20:51:56,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 24. [2023-03-31 20:51:56,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 18 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-03-31 20:51:56,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2023-03-31 20:51:56,534 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 16 [2023-03-31 20:51:56,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:56,534 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2023-03-31 20:51:56,535 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:56,535 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2023-03-31 20:51:56,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-03-31 20:51:56,535 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:56,535 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:56,543 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-03-31 20:51:56,740 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:56,740 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:56,741 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:56,741 INFO L85 PathProgramCache]: Analyzing trace with hash -580615536, now seen corresponding path program 1 times [2023-03-31 20:51:56,741 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:56,741 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [564725840] [2023-03-31 20:51:56,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:56,741 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:56,752 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 20:51:56,752 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [457426870] [2023-03-31 20:51:56,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:56,752 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:56,752 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:56,757 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 20:51:56,758 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-03-31 20:51:56,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:56,803 INFO L262 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 4 conjunts are in the unsatisfiable core [2023-03-31 20:51:56,804 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:51:56,823 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-03-31 20:51:56,824 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:51:56,844 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-03-31 20:51:56,844 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:56,844 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [564725840] [2023-03-31 20:51:56,844 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 20:51:56,844 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [457426870] [2023-03-31 20:51:56,844 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [457426870] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:51:56,844 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1655223063] [2023-03-31 20:51:56,846 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-03-31 20:51:56,846 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:51:56,847 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:51:56,847 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:51:56,847 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:51:56,891 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 20:51:57,037 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-03-31 20:51:57,055 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 20:51:57,059 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:51:57,290 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '659#(and (exists ((|v_main_~#A~0.base_BEFORE_CALL_1| Int) (|v_main_~#B~0.base_BEFORE_CALL_1| Int)) (and (<= 0 |v_main_~#A~0.base_BEFORE_CALL_1|) (not (= (select (select |#memory_int| |v_main_~#B~0.base_BEFORE_CALL_1|) 0) (select (select |#memory_int| |v_main_~#A~0.base_BEFORE_CALL_1|) 0))) (<= 0 |v_main_~#B~0.base_BEFORE_CALL_1|))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:51:57,290 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:51:57,290 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 20:51:57,290 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2023-03-31 20:51:57,290 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1222808552] [2023-03-31 20:51:57,290 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 20:51:57,290 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-03-31 20:51:57,291 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:57,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-03-31 20:51:57,291 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=262, Unknown=0, NotChecked=0, Total=342 [2023-03-31 20:51:57,291 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:57,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:57,379 INFO L93 Difference]: Finished difference Result 58 states and 80 transitions. [2023-03-31 20:51:57,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-03-31 20:51:57,380 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2023-03-31 20:51:57,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:57,381 INFO L225 Difference]: With dead ends: 58 [2023-03-31 20:51:57,381 INFO L226 Difference]: Without dead ends: 40 [2023-03-31 20:51:57,382 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=100, Invalid=320, Unknown=0, NotChecked=0, Total=420 [2023-03-31 20:51:57,384 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 22 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:57,385 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 56 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 20:51:57,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2023-03-31 20:51:57,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2023-03-31 20:51:57,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 30 states have (on average 1.2) internal successors, (36), 30 states have internal predecessors, (36), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-03-31 20:51:57,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2023-03-31 20:51:57,402 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 19 [2023-03-31 20:51:57,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:57,402 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2023-03-31 20:51:57,402 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:57,402 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2023-03-31 20:51:57,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-03-31 20:51:57,403 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:57,403 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:57,410 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-03-31 20:51:57,610 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:57,610 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:57,611 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:57,611 INFO L85 PathProgramCache]: Analyzing trace with hash -10881804, now seen corresponding path program 2 times [2023-03-31 20:51:57,611 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:57,611 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1383467371] [2023-03-31 20:51:57,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:57,611 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:57,621 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 20:51:57,621 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [306369] [2023-03-31 20:51:57,621 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 20:51:57,622 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:57,622 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:57,622 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 20:51:57,625 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-03-31 20:51:57,671 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-03-31 20:51:57,671 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:51:57,672 INFO L262 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 4 conjunts are in the unsatisfiable core [2023-03-31 20:51:57,673 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:51:57,709 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-03-31 20:51:57,710 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:51:57,740 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-03-31 20:51:57,740 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:57,741 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1383467371] [2023-03-31 20:51:57,741 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 20:51:57,741 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [306369] [2023-03-31 20:51:57,741 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [306369] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:51:57,741 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [189080222] [2023-03-31 20:51:57,742 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-03-31 20:51:57,742 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:51:57,743 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:51:57,743 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:51:57,743 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:51:57,759 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 20:51:57,875 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-03-31 20:51:57,886 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 20:51:57,889 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:51:58,096 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '997#(and (exists ((|v_main_~#B~0.base_BEFORE_CALL_2| Int) (|v_main_~#A~0.base_BEFORE_CALL_2| Int)) (and (not (= (select (select |#memory_int| |v_main_~#B~0.base_BEFORE_CALL_2|) 0) (select (select |#memory_int| |v_main_~#A~0.base_BEFORE_CALL_2|) 0))) (<= 0 |v_main_~#A~0.base_BEFORE_CALL_2|) (<= 0 |v_main_~#B~0.base_BEFORE_CALL_2|))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:51:58,097 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:51:58,097 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 20:51:58,097 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2023-03-31 20:51:58,097 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721482884] [2023-03-31 20:51:58,097 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 20:51:58,097 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-03-31 20:51:58,097 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:58,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-03-31 20:51:58,098 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=262, Unknown=0, NotChecked=0, Total=342 [2023-03-31 20:51:58,098 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand has 8 states, 8 states have (on average 3.0) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:58,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:58,205 INFO L93 Difference]: Finished difference Result 145 states and 186 transitions. [2023-03-31 20:51:58,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-03-31 20:51:58,206 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2023-03-31 20:51:58,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:58,207 INFO L225 Difference]: With dead ends: 145 [2023-03-31 20:51:58,207 INFO L226 Difference]: Without dead ends: 118 [2023-03-31 20:51:58,207 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=100, Invalid=320, Unknown=0, NotChecked=0, Total=420 [2023-03-31 20:51:58,208 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 57 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:58,208 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 51 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 20:51:58,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2023-03-31 20:51:58,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 75. [2023-03-31 20:51:58,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 66 states have (on average 1.1818181818181819) internal successors, (78), 66 states have internal predecessors, (78), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-03-31 20:51:58,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 89 transitions. [2023-03-31 20:51:58,246 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 89 transitions. Word has length 25 [2023-03-31 20:51:58,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:58,246 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 89 transitions. [2023-03-31 20:51:58,247 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:58,248 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 89 transitions. [2023-03-31 20:51:58,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-03-31 20:51:58,250 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:58,250 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:58,258 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-03-31 20:51:58,456 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:58,456 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:58,457 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:58,457 INFO L85 PathProgramCache]: Analyzing trace with hash 798227310, now seen corresponding path program 3 times [2023-03-31 20:51:58,457 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:58,457 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [710650499] [2023-03-31 20:51:58,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:58,457 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:58,497 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 20:51:58,497 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1339524979] [2023-03-31 20:51:58,497 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 20:51:58,497 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:58,509 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:58,525 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 20:51:58,532 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-03-31 20:51:59,573 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 20:51:59,573 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:51:59,578 INFO L262 TraceCheckSpWp]: Trace formula consists of 403 conjuncts, 7 conjunts are in the unsatisfiable core [2023-03-31 20:51:59,580 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:51:59,646 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 79 proven. 10 refuted. 0 times theorem prover too weak. 311 trivial. 0 not checked. [2023-03-31 20:51:59,646 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:51:59,725 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 79 proven. 10 refuted. 0 times theorem prover too weak. 311 trivial. 0 not checked. [2023-03-31 20:51:59,725 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:59,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [710650499] [2023-03-31 20:51:59,725 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 20:51:59,726 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1339524979] [2023-03-31 20:51:59,726 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1339524979] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:51:59,726 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1247754265] [2023-03-31 20:51:59,727 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-03-31 20:51:59,727 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:51:59,727 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:51:59,727 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:51:59,727 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:51:59,741 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 20:51:59,830 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-03-31 20:51:59,837 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 20:51:59,839 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:52:00,033 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1788#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_main_~#B~0.base_BEFORE_CALL_3| Int) (|v_main_~#A~0.base_BEFORE_CALL_3| Int)) (and (not (= (select (select |#memory_int| |v_main_~#A~0.base_BEFORE_CALL_3|) 0) (select (select |#memory_int| |v_main_~#B~0.base_BEFORE_CALL_3|) 0))) (<= 0 |v_main_~#B~0.base_BEFORE_CALL_3|) (<= 0 |v_main_~#A~0.base_BEFORE_CALL_3|))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:52:00,033 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:52:00,033 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 20:52:00,033 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2023-03-31 20:52:00,033 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021840448] [2023-03-31 20:52:00,033 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 20:52:00,034 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-03-31 20:52:00,034 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:52:00,034 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-03-31 20:52:00,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=451, Unknown=0, NotChecked=0, Total=600 [2023-03-31 20:52:00,034 INFO L87 Difference]: Start difference. First operand 75 states and 89 transitions. Second operand has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:00,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:52:00,229 INFO L93 Difference]: Finished difference Result 206 states and 293 transitions. [2023-03-31 20:52:00,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-03-31 20:52:00,230 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 61 [2023-03-31 20:52:00,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:52:00,230 INFO L225 Difference]: With dead ends: 206 [2023-03-31 20:52:00,230 INFO L226 Difference]: Without dead ends: 142 [2023-03-31 20:52:00,231 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 159 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 318 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=229, Invalid=641, Unknown=0, NotChecked=0, Total=870 [2023-03-31 20:52:00,232 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 79 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:52:00,232 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 38 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 20:52:00,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2023-03-31 20:52:00,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 141. [2023-03-31 20:52:00,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 126 states have (on average 1.0952380952380953) internal successors, (138), 126 states have internal predecessors, (138), 12 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2023-03-31 20:52:00,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 161 transitions. [2023-03-31 20:52:00,266 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 161 transitions. Word has length 61 [2023-03-31 20:52:00,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:52:00,267 INFO L495 AbstractCegarLoop]: Abstraction has 141 states and 161 transitions. [2023-03-31 20:52:00,267 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:00,267 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 161 transitions. [2023-03-31 20:52:00,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2023-03-31 20:52:00,268 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:52:00,268 INFO L195 NwaCegarLoop]: trace histogram [40, 40, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:52:00,278 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-03-31 20:52:00,476 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:52:00,476 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:52:00,477 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:52:00,477 INFO L85 PathProgramCache]: Analyzing trace with hash 700167534, now seen corresponding path program 4 times [2023-03-31 20:52:00,477 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:52:00,477 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1079531309] [2023-03-31 20:52:00,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:52:00,477 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:52:00,512 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 20:52:00,512 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [804681553] [2023-03-31 20:52:00,512 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 20:52:00,512 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:52:00,513 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:52:00,513 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 20:52:00,515 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-03-31 20:52:00,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:52:00,693 INFO L262 TraceCheckSpWp]: Trace formula consists of 787 conjuncts, 13 conjunts are in the unsatisfiable core [2023-03-31 20:52:00,696 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:52:00,805 INFO L134 CoverageAnalysis]: Checked inductivity of 1912 backedges. 367 proven. 55 refuted. 0 times theorem prover too weak. 1490 trivial. 0 not checked. [2023-03-31 20:52:00,805 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:52:00,939 INFO L134 CoverageAnalysis]: Checked inductivity of 1912 backedges. 367 proven. 55 refuted. 0 times theorem prover too weak. 1490 trivial. 0 not checked. [2023-03-31 20:52:00,939 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:52:00,940 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1079531309] [2023-03-31 20:52:00,940 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 20:52:00,940 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [804681553] [2023-03-31 20:52:00,940 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [804681553] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:52:00,940 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1494547812] [2023-03-31 20:52:00,942 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-03-31 20:52:00,943 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:52:00,943 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:52:00,943 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:52:00,943 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:52:00,955 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 20:52:01,061 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-03-31 20:52:01,068 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 20:52:01,070 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:52:01,267 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3139#(and (exists ((|v_main_~#B~0.base_BEFORE_CALL_4| Int) (|v_main_~#A~0.base_BEFORE_CALL_4| Int)) (and (<= 0 |v_main_~#B~0.base_BEFORE_CALL_4|) (not (= (select (select |#memory_int| |v_main_~#A~0.base_BEFORE_CALL_4|) 0) (select (select |#memory_int| |v_main_~#B~0.base_BEFORE_CALL_4|) 0))) (<= 0 |v_main_~#A~0.base_BEFORE_CALL_4|))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:52:01,267 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:52:01,267 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 20:52:01,267 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2023-03-31 20:52:01,267 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [594513774] [2023-03-31 20:52:01,268 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 20:52:01,268 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-03-31 20:52:01,268 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:52:01,268 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-03-31 20:52:01,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=395, Invalid=937, Unknown=0, NotChecked=0, Total=1332 [2023-03-31 20:52:01,269 INFO L87 Difference]: Start difference. First operand 141 states and 161 transitions. Second operand has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 26 states have internal predecessors, (40), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:01,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:52:01,716 INFO L93 Difference]: Finished difference Result 398 states and 557 transitions. [2023-03-31 20:52:01,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-03-31 20:52:01,717 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 26 states have internal predecessors, (40), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 109 [2023-03-31 20:52:01,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:52:01,718 INFO L225 Difference]: With dead ends: 398 [2023-03-31 20:52:01,718 INFO L226 Difference]: Without dead ends: 274 [2023-03-31 20:52:01,720 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 291 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 822 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=703, Invalid=1553, Unknown=0, NotChecked=0, Total=2256 [2023-03-31 20:52:01,720 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 180 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 244 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 191 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 390 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 244 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-03-31 20:52:01,720 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [191 Valid, 74 Invalid, 390 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [244 Valid, 146 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-03-31 20:52:01,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2023-03-31 20:52:01,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 273. [2023-03-31 20:52:01,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 273 states, 246 states have (on average 1.048780487804878) internal successors, (258), 246 states have internal predecessors, (258), 24 states have call successors, (24), 3 states have call predecessors, (24), 2 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2023-03-31 20:52:01,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 305 transitions. [2023-03-31 20:52:01,801 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 305 transitions. Word has length 109 [2023-03-31 20:52:01,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:52:01,802 INFO L495 AbstractCegarLoop]: Abstraction has 273 states and 305 transitions. [2023-03-31 20:52:01,802 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 26 states have internal predecessors, (40), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:01,802 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 305 transitions. [2023-03-31 20:52:01,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2023-03-31 20:52:01,811 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:52:01,812 INFO L195 NwaCegarLoop]: trace histogram [88, 88, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:52:01,824 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-03-31 20:52:02,027 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:52:02,027 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:52:02,028 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:52:02,028 INFO L85 PathProgramCache]: Analyzing trace with hash 2106321262, now seen corresponding path program 5 times [2023-03-31 20:52:02,028 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:52:02,028 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [639481415] [2023-03-31 20:52:02,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:52:02,028 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:52:02,079 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 20:52:02,080 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [884457313] [2023-03-31 20:52:02,080 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 20:52:02,080 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:52:02,080 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:52:02,081 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 20:52:02,083 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process