/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 OctagonDomain -i ../sv-benchmarks/c/array-patterns/array27_pattern.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 15:10:26,888 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 15:10:26,890 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 15:10:26,931 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 15:10:26,931 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 15:10:26,934 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 15:10:26,937 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 15:10:26,939 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 15:10:26,941 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 15:10:26,947 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 15:10:26,948 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 15:10:26,949 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 15:10:26,950 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 15:10:26,952 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 15:10:26,953 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 15:10:26,954 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 15:10:26,955 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 15:10:26,955 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 15:10:26,957 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 15:10:26,967 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 15:10:26,968 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 15:10:26,969 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 15:10:26,970 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 15:10:26,971 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 15:10:26,975 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-04-02 15:10:26,978 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 15:10:26,979 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 15:10:26,980 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 15:10:26,981 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 15:10:26,981 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 15:10:26,981 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 15:10:26,982 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 15:10:26,982 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 15:10:26,982 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 15:10:26,983 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 15:10:26,983 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 15:10:26,985 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 [2023-04-02 15:10:27,014 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 15:10:27,014 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 15:10:27,015 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 15:10:27,015 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 15:10:27,015 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 15:10:27,016 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 15:10:27,016 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 15:10:27,016 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 15:10:27,016 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 15:10:27,016 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 15:10:27,017 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 15:10:27,017 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 15:10:27,017 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 15:10:27,017 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 15:10:27,017 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 15:10:27,017 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 15:10:27,017 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 15:10:27,018 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 15:10:27,018 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 15:10:27,018 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 15:10:27,018 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 15:10:27,018 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 15:10:27,018 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 15:10:27,019 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 15:10:27,019 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 15:10:27,019 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 15:10:27,019 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 15:10:27,019 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 15:10:27,020 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 15:10:27,020 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 15:10:27,020 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 15:10:27,020 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 15:10:27,020 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 15:10:27,020 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 15:10:27,020 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 15:10:27,020 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 15:10:27,021 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 15:10:27,021 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 15:10:27,021 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 15:10:27,021 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 15:10:27,021 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 15:10:27,021 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 15:10:27,244 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 15:10:27,265 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 15:10:27,267 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 15:10:27,268 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 15:10:27,269 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 15:10:27,270 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-patterns/array27_pattern.c [2023-04-02 15:10:28,418 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 15:10:28,627 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 15:10:28,627 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-patterns/array27_pattern.c [2023-04-02 15:10:28,633 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d64ed87e1/fc5638e01a144d2ea199e594bb163d42/FLAG3f994447d [2023-04-02 15:10:28,647 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d64ed87e1/fc5638e01a144d2ea199e594bb163d42 [2023-04-02 15:10:28,650 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 15:10:28,652 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 15:10:28,653 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 15:10:28,653 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 15:10:28,656 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 15:10:28,657 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 03:10:28" (1/1) ... [2023-04-02 15:10:28,658 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@269ab41d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:10:28, skipping insertion in model container [2023-04-02 15:10:28,658 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 03:10:28" (1/1) ... [2023-04-02 15:10:28,664 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 15:10:28,678 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 15:10:28,817 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-patterns/array27_pattern.c[1253,1266] [2023-04-02 15:10:28,835 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 15:10:28,844 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 15:10:28,855 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-patterns/array27_pattern.c[1253,1266] [2023-04-02 15:10:28,869 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 15:10:28,882 INFO L208 MainTranslator]: Completed translation [2023-04-02 15:10:28,883 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:10:28 WrapperNode [2023-04-02 15:10:28,883 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 15:10:28,884 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 15:10:28,884 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 15:10:28,884 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 15:10:28,893 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:10:28" (1/1) ... [2023-04-02 15:10:28,893 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:10:28" (1/1) ... [2023-04-02 15:10:28,899 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:10:28" (1/1) ... [2023-04-02 15:10:28,899 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:10:28" (1/1) ... [2023-04-02 15:10:28,912 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:10:28" (1/1) ... [2023-04-02 15:10:28,917 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:10:28" (1/1) ... [2023-04-02 15:10:28,924 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:10:28" (1/1) ... [2023-04-02 15:10:28,925 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:10:28" (1/1) ... [2023-04-02 15:10:28,926 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 15:10:28,927 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 15:10:28,927 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 15:10:28,927 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 15:10:28,928 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:10:28" (1/1) ... [2023-04-02 15:10:28,933 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 15:10:28,941 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:10:28,958 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) [2023-04-02 15:10:28,978 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 [2023-04-02 15:10:28,995 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 15:10:28,995 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 15:10:28,995 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 15:10:28,997 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-02 15:10:28,997 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 15:10:28,997 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 15:10:28,997 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 15:10:28,997 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 15:10:28,997 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 15:10:28,997 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 15:10:28,997 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-02 15:10:28,998 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 15:10:28,998 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-02 15:10:28,998 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2023-04-02 15:10:28,998 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 15:10:28,998 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-02 15:10:28,998 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 15:10:28,999 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 15:10:28,999 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 15:10:28,999 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 15:10:28,999 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 15:10:28,999 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 15:10:29,064 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 15:10:29,065 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 15:10:29,220 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 15:10:29,278 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 15:10:29,278 INFO L302 CfgBuilder]: Removed 4 assume(true) statements. [2023-04-02 15:10:29,284 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 03:10:29 BoogieIcfgContainer [2023-04-02 15:10:29,284 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 15:10:29,293 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 15:10:29,293 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 15:10:29,296 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 15:10:29,296 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 03:10:28" (1/3) ... [2023-04-02 15:10:29,297 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44447aa4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 03:10:29, skipping insertion in model container [2023-04-02 15:10:29,297 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:10:28" (2/3) ... [2023-04-02 15:10:29,297 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44447aa4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 03:10:29, skipping insertion in model container [2023-04-02 15:10:29,297 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 03:10:29" (3/3) ... [2023-04-02 15:10:29,298 INFO L112 eAbstractionObserver]: Analyzing ICFG array27_pattern.c [2023-04-02 15:10:29,324 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 15:10:29,325 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 15:10:29,378 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 15:10:29,384 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;@62a0660, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 15:10:29,385 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 15:10:29,389 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-02 15:10:29,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-04-02 15:10:29,395 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:10:29,395 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:10:29,396 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:10:29,402 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:10:29,403 INFO L85 PathProgramCache]: Analyzing trace with hash 1629745298, now seen corresponding path program 1 times [2023-04-02 15:10:29,411 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:10:29,411 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1808923970] [2023-04-02 15:10:29,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:10:29,412 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:10:29,526 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:10:29,526 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [129909162] [2023-04-02 15:10:29,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:10:29,527 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:10:29,527 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:10:29,541 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) [2023-04-02 15:10:29,573 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-02 15:10:29,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:10:29,646 INFO L262 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 7 conjunts are in the unsatisfiable core [2023-04-02 15:10:29,653 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:10:29,744 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:10:29,744 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-02 15:10:29,745 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:10:29,745 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1808923970] [2023-04-02 15:10:29,745 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:10:29,746 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [129909162] [2023-04-02 15:10:29,746 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [129909162] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 15:10:29,746 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 15:10:29,746 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-02 15:10:29,748 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [860400883] [2023-04-02 15:10:29,749 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 15:10:29,752 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-02 15:10:29,752 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:10:29,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-02 15:10:29,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-04-02 15:10:29,784 INFO L87 Difference]: Start difference. First operand has 24 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 15:10:29,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:10:29,868 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2023-04-02 15:10:29,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-04-02 15:10:29,870 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 15 [2023-04-02 15:10:29,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:10:29,879 INFO L225 Difference]: With dead ends: 41 [2023-04-02 15:10:29,880 INFO L226 Difference]: Without dead ends: 22 [2023-04-02 15:10:29,882 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-04-02 15:10:29,886 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 23 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 15:10:29,886 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 41 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 15:10:29,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-04-02 15:10:29,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 20. [2023-04-02 15:10:29,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 15:10:29,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2023-04-02 15:10:29,917 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 15 [2023-04-02 15:10:29,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:10:29,918 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2023-04-02 15:10:29,918 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 15:10:29,919 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2023-04-02 15:10:29,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-04-02 15:10:29,920 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:10:29,920 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:10:29,945 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-02 15:10:30,124 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 [2023-04-02 15:10:30,125 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:10:30,125 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:10:30,126 INFO L85 PathProgramCache]: Analyzing trace with hash 1729452823, now seen corresponding path program 1 times [2023-04-02 15:10:30,126 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:10:30,126 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1335892029] [2023-04-02 15:10:30,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:10:30,126 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:10:30,140 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:10:30,141 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [886698102] [2023-04-02 15:10:30,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:10:30,141 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:10:30,141 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:10:30,147 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) [2023-04-02 15:10:30,148 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-02 15:10:30,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:10:30,213 INFO L262 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-02 15:10:30,214 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:10:30,242 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-02 15:10:30,243 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-02 15:10:30,243 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:10:30,243 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1335892029] [2023-04-02 15:10:30,243 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:10:30,244 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [886698102] [2023-04-02 15:10:30,244 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [886698102] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 15:10:30,244 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 15:10:30,244 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-02 15:10:30,244 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1647691469] [2023-04-02 15:10:30,244 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 15:10:30,245 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-02 15:10:30,245 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:10:30,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-02 15:10:30,246 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-04-02 15:10:30,246 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 15:10:30,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:10:30,286 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2023-04-02 15:10:30,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-02 15:10:30,286 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2023-04-02 15:10:30,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:10:30,287 INFO L225 Difference]: With dead ends: 32 [2023-04-02 15:10:30,287 INFO L226 Difference]: Without dead ends: 22 [2023-04-02 15:10:30,288 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-04-02 15:10:30,289 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 7 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 15:10:30,289 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 30 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 15:10:30,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-04-02 15:10:30,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-04-02 15:10:30,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 15:10:30,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2023-04-02 15:10:30,295 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 19 [2023-04-02 15:10:30,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:10:30,295 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2023-04-02 15:10:30,295 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 15:10:30,295 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2023-04-02 15:10:30,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-04-02 15:10:30,296 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:10:30,296 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:10:30,307 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-02 15:10:30,501 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 [2023-04-02 15:10:30,502 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:10:30,503 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:10:30,503 INFO L85 PathProgramCache]: Analyzing trace with hash 1742736778, now seen corresponding path program 1 times [2023-04-02 15:10:30,503 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:10:30,503 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [626088873] [2023-04-02 15:10:30,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:10:30,503 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:10:30,523 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:10:30,524 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [134740491] [2023-04-02 15:10:30,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:10:30,524 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:10:30,524 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:10:30,532 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) [2023-04-02 15:10:30,537 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-02 15:10:30,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:10:30,593 INFO L262 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 32 conjunts are in the unsatisfiable core [2023-04-02 15:10:30,597 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:10:30,719 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 15:10:30,983 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:10:30,983 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:10:31,278 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 15:10:31,278 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 38 treesize of output 52 [2023-04-02 15:10:31,291 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 15:10:31,291 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 17 [2023-04-02 15:10:31,315 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 66 treesize of output 54 [2023-04-02 15:10:31,324 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 19 [2023-04-02 15:10:31,337 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 15:10:31,337 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 40 [2023-04-02 15:10:31,453 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:10:31,454 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:10:31,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [626088873] [2023-04-02 15:10:31,454 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:10:31,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [134740491] [2023-04-02 15:10:31,454 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [134740491] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:10:31,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1632653285] [2023-04-02 15:10:31,469 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-02 15:10:31,470 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:10:31,472 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:10:31,476 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:10:31,476 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:10:31,537 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:10:32,460 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs [2023-04-02 15:10:32,478 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 23 for LOIs [2023-04-02 15:10:32,482 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:10:32,487 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:10:58,217 WARN L223 SmtUtils]: Spent 12.69s on a formula simplification. DAG size of input: 37 DAG size of output: 23 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-04-02 15:11:17,598 WARN L223 SmtUtils]: Spent 13.30s on a formula simplification. DAG size of input: 39 DAG size of output: 25 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-04-02 15:11:17,599 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '471#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:11:17,599 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:11:17,600 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:11:17,600 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2023-04-02 15:11:17,600 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1374665682] [2023-04-02 15:11:17,600 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:11:17,600 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-04-02 15:11:17,601 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:11:17,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-04-02 15:11:17,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=1530, Unknown=6, NotChecked=0, Total=1722 [2023-04-02 15:11:17,604 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand has 26 states, 23 states have (on average 1.173913043478261) internal successors, (27), 23 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-04-02 15:11:25,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:11:25,215 INFO L93 Difference]: Finished difference Result 57 states and 75 transitions. [2023-04-02 15:11:25,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2023-04-02 15:11:25,216 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 23 states have (on average 1.173913043478261) internal successors, (27), 23 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 21 [2023-04-02 15:11:25,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:11:25,218 INFO L225 Difference]: With dead ends: 57 [2023-04-02 15:11:25,218 INFO L226 Difference]: Without dead ends: 50 [2023-04-02 15:11:25,220 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1347 ImplicationChecksByTransitivity, 52.7s TimeCoverageRelationStatistics Valid=636, Invalid=3911, Unknown=9, NotChecked=0, Total=4556 [2023-04-02 15:11:25,221 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 79 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 280 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 280 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 15:11:25,221 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [79 Valid, 91 Invalid, 337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 280 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 15:11:25,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2023-04-02 15:11:25,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 36. [2023-04-02 15:11:25,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 29 states have (on average 1.4137931034482758) internal successors, (41), 29 states have internal predecessors, (41), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 15:11:25,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 47 transitions. [2023-04-02 15:11:25,236 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 47 transitions. Word has length 21 [2023-04-02 15:11:25,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:11:25,236 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 47 transitions. [2023-04-02 15:11:25,237 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 23 states have (on average 1.173913043478261) internal successors, (27), 23 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-04-02 15:11:25,237 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 47 transitions. [2023-04-02 15:11:25,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-04-02 15:11:25,238 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:11:25,239 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:11:25,248 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-02 15:11:25,444 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 [2023-04-02 15:11:25,445 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:11:25,445 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:11:25,445 INFO L85 PathProgramCache]: Analyzing trace with hash -1165061527, now seen corresponding path program 2 times [2023-04-02 15:11:25,445 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:11:25,446 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [179828826] [2023-04-02 15:11:25,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:11:25,446 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:11:25,457 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:11:25,458 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1582134243] [2023-04-02 15:11:25,458 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:11:25,458 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:11:25,458 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:11:25,469 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) [2023-04-02 15:11:25,480 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-02 15:11:25,578 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-02 15:11:25,579 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:11:25,580 INFO L262 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-02 15:11:25,581 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:11:25,623 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 15:11:25,623 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:11:25,662 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 15:11:25,662 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:11:25,662 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [179828826] [2023-04-02 15:11:25,662 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:11:25,662 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1582134243] [2023-04-02 15:11:25,662 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1582134243] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:11:25,662 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1916813103] [2023-04-02 15:11:25,665 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-02 15:11:25,665 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:11:25,666 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:11:25,666 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:11:25,666 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:11:25,694 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:11:26,323 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs [2023-04-02 15:11:26,334 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 23 for LOIs [2023-04-02 15:11:26,337 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:11:26,341 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:11:59,288 WARN L223 SmtUtils]: Spent 16.26s on a formula simplification. DAG size of input: 37 DAG size of output: 32 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-04-02 15:12:24,976 WARN L223 SmtUtils]: Spent 21.66s on a formula simplification. DAG size of input: 39 DAG size of output: 25 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-04-02 15:12:24,977 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '850#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:12:24,977 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:12:24,977 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:12:24,977 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2023-04-02 15:12:24,977 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954530416] [2023-04-02 15:12:24,977 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:12:24,977 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-04-02 15:12:24,978 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:12:24,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-04-02 15:12:24,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=613, Unknown=8, NotChecked=0, Total=702 [2023-04-02 15:12:24,979 INFO L87 Difference]: Start difference. First operand 36 states and 47 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 15:12:35,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:12:35,121 INFO L93 Difference]: Finished difference Result 62 states and 83 transitions. [2023-04-02 15:12:35,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-04-02 15:12:35,121 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 22 [2023-04-02 15:12:35,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:12:35,122 INFO L225 Difference]: With dead ends: 62 [2023-04-02 15:12:35,122 INFO L226 Difference]: Without dead ends: 50 [2023-04-02 15:12:35,123 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 268 ImplicationChecksByTransitivity, 68.7s TimeCoverageRelationStatistics Valid=116, Invalid=801, Unknown=13, NotChecked=0, Total=930 [2023-04-02 15:12:35,123 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 10 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:12:35,124 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 40 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:12:35,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2023-04-02 15:12:35,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 43. [2023-04-02 15:12:35,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 36 states have (on average 1.3888888888888888) internal successors, (50), 36 states have internal predecessors, (50), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 15:12:35,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 56 transitions. [2023-04-02 15:12:35,139 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 56 transitions. Word has length 22 [2023-04-02 15:12:35,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:12:35,139 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 56 transitions. [2023-04-02 15:12:35,139 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 15:12:35,140 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 56 transitions. [2023-04-02 15:12:35,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-04-02 15:12:35,140 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:12:35,140 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:12:35,153 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-02 15:12:35,345 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 [2023-04-02 15:12:35,346 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:12:35,346 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:12:35,346 INFO L85 PathProgramCache]: Analyzing trace with hash -2006615748, now seen corresponding path program 3 times [2023-04-02 15:12:35,347 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:12:35,347 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1949625597] [2023-04-02 15:12:35,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:12:35,347 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:12:35,362 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:12:35,362 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1247606894] [2023-04-02 15:12:35,362 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:12:35,362 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:12:35,362 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:12:35,371 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) [2023-04-02 15:12:35,371 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-02 15:12:35,413 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:12:35,413 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:12:35,413 INFO L262 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-02 15:12:35,415 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:12:35,454 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 15:12:35,454 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:12:35,487 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 15:12:35,487 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:12:35,487 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1949625597] [2023-04-02 15:12:35,487 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:12:35,487 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1247606894] [2023-04-02 15:12:35,487 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1247606894] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:12:35,488 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [909020332] [2023-04-02 15:12:35,491 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-02 15:12:35,492 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:12:35,492 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:12:35,492 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:12:35,492 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:12:35,514 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:12:36,035 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs [2023-04-02 15:12:36,043 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 23 for LOIs [2023-04-02 15:12:36,046 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:12:36,049 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:13:09,291 WARN L223 SmtUtils]: Spent 26.64s on a formula simplification. DAG size of input: 37 DAG size of output: 23 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-04-02 15:13:38,964 WARN L223 SmtUtils]: Spent 11.64s on a formula simplification. DAG size of input: 39 DAG size of output: 25 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-04-02 15:13:38,965 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1229#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:13:38,965 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:13:38,965 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:13:38,965 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2023-04-02 15:13:38,965 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561093529] [2023-04-02 15:13:38,965 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:13:38,966 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-04-02 15:13:38,966 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:13:38,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-04-02 15:13:38,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=513, Unknown=11, NotChecked=0, Total=600 [2023-04-02 15:13:38,967 INFO L87 Difference]: Start difference. First operand 43 states and 56 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 15:13:39,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:13:39,079 INFO L93 Difference]: Finished difference Result 91 states and 122 transitions. [2023-04-02 15:13:39,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-02 15:13:39,079 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 25 [2023-04-02 15:13:39,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:13:39,080 INFO L225 Difference]: With dead ends: 91 [2023-04-02 15:13:39,080 INFO L226 Difference]: Without dead ends: 51 [2023-04-02 15:13:39,081 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 48 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 63.0s TimeCoverageRelationStatistics Valid=98, Invalid=647, Unknown=11, NotChecked=0, Total=756 [2023-04-02 15:13:39,082 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 28 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:13:39,082 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 36 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:13:39,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2023-04-02 15:13:39,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 42. [2023-04-02 15:13:39,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 35 states have (on average 1.3142857142857143) internal successors, (46), 35 states have internal predecessors, (46), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 15:13:39,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 52 transitions. [2023-04-02 15:13:39,109 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 52 transitions. Word has length 25 [2023-04-02 15:13:39,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:13:39,109 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 52 transitions. [2023-04-02 15:13:39,109 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 15:13:39,109 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 52 transitions. [2023-04-02 15:13:39,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-04-02 15:13:39,110 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:13:39,110 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:13:39,119 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-04-02 15:13:39,313 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 [2023-04-02 15:13:39,313 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:13:39,313 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:13:39,314 INFO L85 PathProgramCache]: Analyzing trace with hash -1001806459, now seen corresponding path program 4 times [2023-04-02 15:13:39,314 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:13:39,314 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [700777842] [2023-04-02 15:13:39,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:13:39,314 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:13:39,325 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:13:39,325 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1090307777] [2023-04-02 15:13:39,325 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 15:13:39,325 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:13:39,325 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:13:39,326 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) [2023-04-02 15:13:39,333 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-02 15:13:39,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:13:39,386 INFO L262 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-02 15:13:39,388 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:13:39,421 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-04-02 15:13:39,421 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:13:39,457 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-04-02 15:13:39,457 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:13:39,457 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [700777842] [2023-04-02 15:13:39,457 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:13:39,457 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1090307777] [2023-04-02 15:13:39,458 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1090307777] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:13:39,458 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [636164255] [2023-04-02 15:13:39,459 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-02 15:13:39,459 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:13:39,460 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:13:39,460 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:13:39,460 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:13:39,478 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:13:39,978 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs [2023-04-02 15:13:39,990 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 23 for LOIs [2023-04-02 15:13:39,993 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:13:39,998 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:14:16,742 WARN L223 SmtUtils]: Spent 16.14s on a formula simplification. DAG size of input: 37 DAG size of output: 32 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-04-02 15:14:46,789 WARN L223 SmtUtils]: Spent 22.02s on a formula simplification. DAG size of input: 39 DAG size of output: 34 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-04-02 15:14:46,790 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1661#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~ARR_SIZE~0 32767) (<= 1 ~ARR_SIZE~0) (= |#NULL.base| 0))' at error location [2023-04-02 15:14:46,790 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:14:46,790 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:14:46,790 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2023-04-02 15:14:46,790 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1212058346] [2023-04-02 15:14:46,791 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:14:46,791 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-04-02 15:14:46,791 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:14:46,791 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-04-02 15:14:46,792 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=512, Unknown=12, NotChecked=0, Total=600 [2023-04-02 15:14:46,792 INFO L87 Difference]: Start difference. First operand 42 states and 52 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 15:14:46,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:14:46,874 INFO L93 Difference]: Finished difference Result 47 states and 56 transitions. [2023-04-02 15:14:46,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-02 15:14:46,874 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 26 [2023-04-02 15:14:46,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:14:46,875 INFO L225 Difference]: With dead ends: 47 [2023-04-02 15:14:46,875 INFO L226 Difference]: Without dead ends: 32 [2023-04-02 15:14:46,875 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 51 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 66.8s TimeCoverageRelationStatistics Valid=97, Invalid=647, Unknown=12, NotChecked=0, Total=756 [2023-04-02 15:14:46,876 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 11 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 15:14:46,876 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 56 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 15:14:46,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-04-02 15:14:46,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2023-04-02 15:14:46,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 25 states have (on average 1.24) internal successors, (31), 25 states have internal predecessors, (31), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 15:14:46,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 37 transitions. [2023-04-02 15:14:46,886 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 37 transitions. Word has length 26 [2023-04-02 15:14:46,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:14:46,886 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 37 transitions. [2023-04-02 15:14:46,886 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 15:14:46,886 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 37 transitions. [2023-04-02 15:14:46,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-04-02 15:14:46,887 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:14:46,887 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:14:46,894 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-04-02 15:14:47,095 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 [2023-04-02 15:14:47,095 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:14:47,095 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:14:47,096 INFO L85 PathProgramCache]: Analyzing trace with hash 248284, now seen corresponding path program 5 times [2023-04-02 15:14:47,096 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:14:47,096 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1141474720] [2023-04-02 15:14:47,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:14:47,096 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:14:47,110 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:14:47,111 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1924120334] [2023-04-02 15:14:47,111 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:14:47,111 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:14:47,111 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:14:47,120 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) [2023-04-02 15:14:47,121 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-02 15:14:47,311 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-04-02 15:14:47,311 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:14:47,313 INFO L262 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 66 conjunts are in the unsatisfiable core [2023-04-02 15:14:47,316 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:14:47,334 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 15:14:47,352 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2023-04-02 15:14:47,430 INFO L321 Elim1Store]: treesize reduction 34, result has 33.3 percent of original size [2023-04-02 15:14:47,430 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 32 treesize of output 34 [2023-04-02 15:14:47,481 INFO L321 Elim1Store]: treesize reduction 54, result has 23.9 percent of original size [2023-04-02 15:14:47,482 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 44 treesize of output 49 [2023-04-02 15:14:47,871 INFO L321 Elim1Store]: treesize reduction 42, result has 60.7 percent of original size [2023-04-02 15:14:47,872 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 68 treesize of output 82 [2023-04-02 15:14:48,071 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:14:48,071 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:14:48,869 INFO L321 Elim1Store]: treesize reduction 41, result has 2.4 percent of original size [2023-04-02 15:14:48,870 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 53 treesize of output 28 [2023-04-02 15:14:49,834 INFO L321 Elim1Store]: treesize reduction 41, result has 2.4 percent of original size [2023-04-02 15:14:49,835 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 38354 treesize of output 31954 [2023-04-02 15:14:50,086 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 15:14:50,086 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 38 treesize of output 52 [2023-04-02 15:14:50,110 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 15:14:50,111 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 17 [2023-04-02 15:14:50,167 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 353 treesize of output 335 [2023-04-02 15:14:50,174 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 15:14:50,175 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 15:14:50,175 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 15:14:50,176 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 15:14:50,176 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 15:14:50,177 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 15:14:50,177 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 15:14:50,178 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 15:14:50,179 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:14:50,180 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 15:14:50,180 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:14:50,183 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 23 [2023-04-02 15:14:50,208 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 184 treesize of output 174 [2023-04-02 15:14:50,614 INFO L321 Elim1Store]: treesize reduction 12, result has 87.4 percent of original size [2023-04-02 15:14:50,616 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 4110110 treesize of output 3700581 [2023-04-02 15:14:53,499 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:14:53,499 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:14:53,499 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1141474720] [2023-04-02 15:14:53,500 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:14:53,500 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1924120334] [2023-04-02 15:14:53,500 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1924120334] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:14:53,500 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1851548913] [2023-04-02 15:14:53,502 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-02 15:14:53,502 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:14:53,502 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:14:53,502 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:14:53,502 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:14:53,525 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:14:53,931 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs [2023-04-02 15:14:53,942 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 23 for LOIs [2023-04-02 15:14:53,945 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:14:53,948 INFO L180 IcfgInterpreter]: Interpretation finished