/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/reducercommutativity/sep.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 02:45:45,995 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 02:45:45,997 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 02:45:46,013 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 02:45:46,014 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 02:45:46,014 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 02:45:46,015 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 02:45:46,016 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 02:45:46,021 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 02:45:46,022 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 02:45:46,022 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 02:45:46,023 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 02:45:46,023 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 02:45:46,024 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 02:45:46,024 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 02:45:46,025 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 02:45:46,025 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 02:45:46,026 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 02:45:46,027 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 02:45:46,028 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 02:45:46,029 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 02:45:46,031 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 02:45:46,032 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 02:45:46,032 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 02:45:46,034 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-04-01 02:45:46,036 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 02:45:46,037 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 02:45:46,037 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 02:45:46,038 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 02:45:46,038 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 02:45:46,039 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 02:45:46,039 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 02:45:46,039 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 02:45:46,039 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 02:45:46,040 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 02:45:46,041 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 02:45:46,041 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 [2023-04-01 02:45:46,056 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 02:45:46,056 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 02:45:46,059 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 02:45:46,059 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 02:45:46,059 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 02:45:46,060 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 02:45:46,060 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 02:45:46,060 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 02:45:46,060 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 02:45:46,060 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 02:45:46,060 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 02:45:46,061 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 02:45:46,061 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 02:45:46,061 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 02:45:46,065 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 02:45:46,065 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 02:45:46,065 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 02:45:46,065 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 02:45:46,066 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 02:45:46,066 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 02:45:46,066 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 02:45:46,066 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 02:45:46,066 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 02:45:46,066 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 02:45:46,066 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 02:45:46,066 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 02:45:46,066 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 02:45:46,067 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 02:45:46,067 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 02:45:46,067 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 02:45:46,067 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 02:45:46,067 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 02:45:46,067 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 02:45:46,067 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 02:45:46,068 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 02:45:46,068 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 02:45:46,068 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 02:45:46,068 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 02:45:46,068 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 02:45:46,068 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 02:45:46,068 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 02:45:46,068 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-01 02:45:46,249 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 02:45:46,262 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 02:45:46,264 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 02:45:46,264 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 02:45:46,265 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 02:45:46,266 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/reducercommutativity/sep.i [2023-04-01 02:45:47,298 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 02:45:47,442 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 02:45:47,442 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/reducercommutativity/sep.i [2023-04-01 02:45:47,447 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8827dc422/1930933b4e004085976f6a5cdf29626f/FLAGdf5ac5e38 [2023-04-01 02:45:47,459 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8827dc422/1930933b4e004085976f6a5cdf29626f [2023-04-01 02:45:47,461 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 02:45:47,462 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 02:45:47,467 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 02:45:47,467 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 02:45:47,470 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 02:45:47,471 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 02:45:47" (1/1) ... [2023-04-01 02:45:47,472 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1852c7d7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:45:47, skipping insertion in model container [2023-04-01 02:45:47,472 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 02:45:47" (1/1) ... [2023-04-01 02:45:47,478 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 02:45:47,493 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 02:45:47,612 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/reducercommutativity/sep.i[1298,1311] [2023-04-01 02:45:47,615 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 02:45:47,621 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 02:45:47,645 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/reducercommutativity/sep.i[1298,1311] [2023-04-01 02:45:47,646 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 02:45:47,657 INFO L208 MainTranslator]: Completed translation [2023-04-01 02:45:47,658 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:45:47 WrapperNode [2023-04-01 02:45:47,658 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 02:45:47,659 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 02:45:47,659 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 02:45:47,659 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 02:45:47,666 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:45:47" (1/1) ... [2023-04-01 02:45:47,667 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:45:47" (1/1) ... [2023-04-01 02:45:47,671 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:45:47" (1/1) ... [2023-04-01 02:45:47,671 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:45:47" (1/1) ... [2023-04-01 02:45:47,677 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:45:47" (1/1) ... [2023-04-01 02:45:47,679 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:45:47" (1/1) ... [2023-04-01 02:45:47,680 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:45:47" (1/1) ... [2023-04-01 02:45:47,681 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:45:47" (1/1) ... [2023-04-01 02:45:47,682 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 02:45:47,682 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 02:45:47,683 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 02:45:47,683 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 02:45:47,683 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:45:47" (1/1) ... [2023-04-01 02:45:47,687 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 02:45:47,696 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:45:47,708 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) [2023-04-01 02:45:47,709 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 [2023-04-01 02:45:47,731 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 02:45:47,732 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 02:45:47,732 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 02:45:47,732 INFO L138 BoogieDeclarations]: Found implementation of procedure sep [2023-04-01 02:45:47,732 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 02:45:47,732 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 02:45:47,732 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 02:45:47,732 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-04-01 02:45:47,732 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-04-01 02:45:47,732 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 02:45:47,733 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 02:45:47,733 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 02:45:47,733 INFO L130 BoogieDeclarations]: Found specification of procedure sep [2023-04-01 02:45:47,733 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 02:45:47,733 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 02:45:47,733 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-01 02:45:47,733 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 02:45:47,733 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 02:45:47,733 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 02:45:47,733 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 02:45:47,733 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 02:45:47,784 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 02:45:47,786 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 02:45:47,918 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 02:45:47,971 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 02:45:47,971 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-04-01 02:45:47,973 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 02:45:47 BoogieIcfgContainer [2023-04-01 02:45:47,973 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 02:45:47,974 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 02:45:47,974 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 02:45:47,979 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 02:45:47,979 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 02:45:47" (1/3) ... [2023-04-01 02:45:47,980 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@167f4a85 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 02:45:47, skipping insertion in model container [2023-04-01 02:45:47,980 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:45:47" (2/3) ... [2023-04-01 02:45:47,980 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@167f4a85 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 02:45:47, skipping insertion in model container [2023-04-01 02:45:47,980 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 02:45:47" (3/3) ... [2023-04-01 02:45:47,981 INFO L112 eAbstractionObserver]: Analyzing ICFG sep.i [2023-04-01 02:45:47,993 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 02:45:47,993 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 02:45:48,030 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 02:45:48,035 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;@4b312b6d, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 02:45:48,036 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 02:45:48,039 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 15 states have internal predecessors, (19), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-01 02:45:48,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-04-01 02:45:48,044 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:45:48,045 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:45:48,046 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:45:48,051 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:45:48,052 INFO L85 PathProgramCache]: Analyzing trace with hash -683664610, now seen corresponding path program 1 times [2023-04-01 02:45:48,058 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:45:48,059 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1501379255] [2023-04-01 02:45:48,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:45:48,059 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:45:48,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:45:48,364 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-04-01 02:45:48,364 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:45:48,364 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1501379255] [2023-04-01 02:45:48,365 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1501379255] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:45:48,365 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [504512107] [2023-04-01 02:45:48,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:45:48,365 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:45:48,366 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:45:48,369 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) [2023-04-01 02:45:48,370 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-01 02:45:48,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:45:48,456 INFO L262 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-01 02:45:48,460 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:45:48,524 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-04-01 02:45:48,524 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-01 02:45:48,525 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [504512107] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 02:45:48,525 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-01 02:45:48,525 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 6 [2023-04-01 02:45:48,526 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311989421] [2023-04-01 02:45:48,527 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 02:45:48,530 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-01 02:45:48,530 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:45:48,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-01 02:45:48,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-04-01 02:45:48,582 INFO L87 Difference]: Start difference. First operand has 24 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 15 states have internal predecessors, (19), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2023-04-01 02:45:48,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:45:48,634 INFO L93 Difference]: Finished difference Result 46 states and 57 transitions. [2023-04-01 02:45:48,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-01 02:45:48,636 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), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 24 [2023-04-01 02:45:48,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:45:48,642 INFO L225 Difference]: With dead ends: 46 [2023-04-01 02:45:48,642 INFO L226 Difference]: Without dead ends: 20 [2023-04-01 02:45:48,644 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-04-01 02:45:48,648 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 20 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 02:45:48,649 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 37 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 02:45:48,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-04-01 02:45:48,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-04-01 02:45:48,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 02:45:48,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2023-04-01 02:45:48,679 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 24 [2023-04-01 02:45:48,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:45:48,680 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2023-04-01 02:45:48,680 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), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2023-04-01 02:45:48,680 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2023-04-01 02:45:48,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-04-01 02:45:48,682 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:45:48,682 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:45:48,690 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-01 02:45:48,890 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 [2023-04-01 02:45:48,891 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:45:48,891 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:45:48,891 INFO L85 PathProgramCache]: Analyzing trace with hash 1960015847, now seen corresponding path program 1 times [2023-04-01 02:45:48,891 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:45:48,892 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1026821587] [2023-04-01 02:45:48,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:45:48,892 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:45:48,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:45:49,037 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-04-01 02:45:49,038 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:45:49,038 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1026821587] [2023-04-01 02:45:49,038 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1026821587] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 02:45:49,038 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 02:45:49,038 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-01 02:45:49,038 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656354466] [2023-04-01 02:45:49,038 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 02:45:49,039 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-01 02:45:49,039 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:45:49,040 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-01 02:45:49,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-01 02:45:49,040 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 3 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-04-01 02:45:49,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:45:49,064 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2023-04-01 02:45:49,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-01 02:45:49,064 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 3 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 27 [2023-04-01 02:45:49,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:45:49,066 INFO L225 Difference]: With dead ends: 30 [2023-04-01 02:45:49,066 INFO L226 Difference]: Without dead ends: 21 [2023-04-01 02:45:49,066 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-01 02:45:49,068 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 13 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 02:45:49,068 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 28 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 02:45:49,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-04-01 02:45:49,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-04-01 02:45:49,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 02:45:49,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2023-04-01 02:45:49,077 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 27 [2023-04-01 02:45:49,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:45:49,078 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2023-04-01 02:45:49,079 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 3 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-04-01 02:45:49,079 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2023-04-01 02:45:49,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-04-01 02:45:49,080 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:45:49,080 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:45:49,080 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-01 02:45:49,080 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:45:49,081 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:45:49,081 INFO L85 PathProgramCache]: Analyzing trace with hash -959484533, now seen corresponding path program 1 times [2023-04-01 02:45:49,082 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:45:49,083 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2006519316] [2023-04-01 02:45:49,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:45:49,083 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:45:49,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:45:49,206 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-04-01 02:45:49,206 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:45:49,206 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2006519316] [2023-04-01 02:45:49,207 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2006519316] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:45:49,207 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1698230298] [2023-04-01 02:45:49,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:45:49,207 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:45:49,207 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:45:49,208 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) [2023-04-01 02:45:49,210 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-01 02:45:49,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:45:49,282 INFO L262 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-01 02:45:49,287 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:45:49,331 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-04-01 02:45:49,331 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 02:45:49,414 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-04-01 02:45:49,414 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1698230298] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 02:45:49,414 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [596058722] [2023-04-01 02:45:49,427 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-01 02:45:49,428 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 02:45:49,430 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 02:45:49,434 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 02:45:49,434 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 02:45:49,517 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-01 02:45:50,295 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 37 for LOIs [2023-04-01 02:45:50,379 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 02:45:50,385 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 02:45:51,803 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '453#(and (<= ~N~0 (+ main_~i~1 1)) (<= 1 |#StackHeapBarrier|) (<= 0 (+ main_~ret2~0 2147483648)) (<= ~N~0 2147483647) (<= main_~ret~1 2147483647) (<= main_~ret5~0 2147483647) (or (not (= main_~ret~1 main_~ret5~0)) (not (= main_~ret~1 main_~ret2~0))) (<= 0 (+ main_~ret5~0 2147483648)) (<= 0 (+ main_~ret~1 2147483648)) (<= main_~ret2~0 2147483647) (= |main_~#x~0.offset| 0) (<= 2 ~N~0) (= |old(~N~0)| 0) (= |#NULL.offset| 0) (<= (+ |#StackHeapBarrier| 1) |main_~#x~0.base|) (= |#NULL.base| 0))' at error location [2023-04-01 02:45:51,803 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 02:45:51,803 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 02:45:51,803 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 6] total 10 [2023-04-01 02:45:51,803 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716129919] [2023-04-01 02:45:51,804 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 02:45:51,804 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-04-01 02:45:51,804 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:45:51,805 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-04-01 02:45:51,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=579, Unknown=8, NotChecked=0, Total=702 [2023-04-01 02:45:51,805 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 10 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 10 states have internal predecessors, (25), 3 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) [2023-04-01 02:45:51,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:45:51,861 INFO L93 Difference]: Finished difference Result 36 states and 45 transitions. [2023-04-01 02:45:51,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-01 02:45:51,862 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 10 states have internal predecessors, (25), 3 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) Word has length 28 [2023-04-01 02:45:51,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:45:51,863 INFO L225 Difference]: With dead ends: 36 [2023-04-01 02:45:51,864 INFO L226 Difference]: Without dead ends: 22 [2023-04-01 02:45:51,864 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 61 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 238 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=124, Invalid=624, Unknown=8, NotChecked=0, Total=756 [2023-04-01 02:45:51,866 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 17 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 02:45:51,870 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 49 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 02:45:51,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-04-01 02:45:51,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-04-01 02:45:51,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 02:45:51,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2023-04-01 02:45:51,878 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 28 [2023-04-01 02:45:51,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:45:51,878 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2023-04-01 02:45:51,878 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 10 states have internal predecessors, (25), 3 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) [2023-04-01 02:45:51,878 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2023-04-01 02:45:51,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-04-01 02:45:51,880 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:45:51,880 INFO L195 NwaCegarLoop]: trace histogram [6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:45:51,889 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-01 02:45:52,086 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,SelfDestructingSolverStorable2 [2023-04-01 02:45:52,087 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:45:52,087 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:45:52,087 INFO L85 PathProgramCache]: Analyzing trace with hash -431776682, now seen corresponding path program 2 times [2023-04-01 02:45:52,087 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:45:52,088 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [570068678] [2023-04-01 02:45:52,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:45:52,088 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:45:52,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:45:57,683 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 3 proven. 36 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 02:45:57,684 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:45:57,684 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [570068678] [2023-04-01 02:45:57,684 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [570068678] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:45:57,684 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1090047305] [2023-04-01 02:45:57,684 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 02:45:57,684 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:45:57,684 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:45:57,693 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) [2023-04-01 02:45:57,695 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-01 02:45:57,820 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-04-01 02:45:57,820 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 02:45:57,822 INFO L262 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 92 conjunts are in the unsatisfiable core [2023-04-01 02:45:57,825 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:45:58,270 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 02:45:58,271 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 103 treesize of output 71 [2023-04-01 02:45:59,445 INFO L321 Elim1Store]: treesize reduction 136, result has 38.5 percent of original size [2023-04-01 02:45:59,446 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 1 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 19 case distinctions, treesize of input 223 treesize of output 246 [2023-04-01 02:46:00,893 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 02:46:01,072 INFO L321 Elim1Store]: treesize reduction 108, result has 58.5 percent of original size [2023-04-01 02:46:01,072 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 2 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 20 case distinctions, treesize of input 215 treesize of output 321 [2023-04-01 02:46:14,096 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 02:46:14,097 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 1 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 288 treesize of output 312 [2023-04-01 02:46:16,009 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 8 proven. 33 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 02:46:16,009 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 02:46:16,584 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1090047305] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:46:16,585 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [359920259] [2023-04-01 02:46:16,586 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-01 02:46:16,586 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 02:46:16,587 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 02:46:16,587 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 02:46:16,587 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 02:46:16,604 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-01 02:46:16,904 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 37 for LOIs [2023-04-01 02:46:16,947 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 02:46:16,951 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 02:46:23,374 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '709#(and (<= ~N~0 (+ main_~i~1 1)) (<= 1 |#StackHeapBarrier|) (<= 0 (+ main_~ret2~0 2147483648)) (<= ~N~0 2147483647) (<= main_~ret~1 2147483647) (<= main_~ret5~0 2147483647) (or (not (= main_~ret~1 main_~ret5~0)) (not (= main_~ret~1 main_~ret2~0))) (<= 0 (+ main_~ret5~0 2147483648)) (<= 0 (+ main_~ret~1 2147483648)) (<= main_~ret2~0 2147483647) (= |main_~#x~0.offset| 0) (<= 2 ~N~0) (= |old(~N~0)| 0) (= |#NULL.offset| 0) (<= (+ |#StackHeapBarrier| 1) |main_~#x~0.base|) (= |#NULL.base| 0))' at error location [2023-04-01 02:46:23,374 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 02:46:23,375 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 02:46:23,375 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 24] total 43 [2023-04-01 02:46:23,375 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120872078] [2023-04-01 02:46:23,375 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 02:46:23,375 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2023-04-01 02:46:23,375 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:46:23,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2023-04-01 02:46:23,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=277, Invalid=3372, Unknown=11, NotChecked=0, Total=3660 [2023-04-01 02:46:23,378 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand has 43 states, 32 states have (on average 1.21875) internal successors, (39), 35 states have internal predecessors, (39), 6 states have call successors, (8), 3 states have call predecessors, (8), 7 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2023-04-01 02:46:27,194 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 02:46:37,478 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 02:46:38,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:46:38,002 INFO L93 Difference]: Finished difference Result 55 states and 66 transitions. [2023-04-01 02:46:38,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-04-01 02:46:38,002 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 32 states have (on average 1.21875) internal successors, (39), 35 states have internal predecessors, (39), 6 states have call successors, (8), 3 states have call predecessors, (8), 7 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) Word has length 31 [2023-04-01 02:46:38,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:46:38,004 INFO L225 Difference]: With dead ends: 55 [2023-04-01 02:46:38,004 INFO L226 Difference]: Without dead ends: 51 [2023-04-01 02:46:38,006 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 26 SyntacticMatches, 3 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1883 ImplicationChecksByTransitivity, 18.5s TimeCoverageRelationStatistics Valid=433, Invalid=4955, Unknown=14, NotChecked=0, Total=5402 [2023-04-01 02:46:38,006 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 41 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 666 mSolverCounterSat, 20 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 691 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 666 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.5s IncrementalHoareTripleChecker+Time [2023-04-01 02:46:38,007 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 175 Invalid, 691 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 666 Invalid, 5 Unknown, 0 Unchecked, 7.5s Time] [2023-04-01 02:46:38,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2023-04-01 02:46:38,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 41. [2023-04-01 02:46:38,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 27 states have (on average 1.2592592592592593) internal successors, (34), 29 states have internal predecessors, (34), 8 states have call successors, (8), 4 states have call predecessors, (8), 5 states have return successors, (12), 7 states have call predecessors, (12), 7 states have call successors, (12) [2023-04-01 02:46:38,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 54 transitions. [2023-04-01 02:46:38,015 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 54 transitions. Word has length 31 [2023-04-01 02:46:38,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:46:38,016 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 54 transitions. [2023-04-01 02:46:38,016 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 32 states have (on average 1.21875) internal successors, (39), 35 states have internal predecessors, (39), 6 states have call successors, (8), 3 states have call predecessors, (8), 7 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2023-04-01 02:46:38,016 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 54 transitions. [2023-04-01 02:46:38,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-04-01 02:46:38,017 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:46:38,017 INFO L195 NwaCegarLoop]: trace histogram [7, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:46:38,024 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-04-01 02:46:38,221 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:46:38,222 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:46:38,222 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:46:38,222 INFO L85 PathProgramCache]: Analyzing trace with hash 1678502729, now seen corresponding path program 3 times [2023-04-01 02:46:38,222 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:46:38,223 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [558915983] [2023-04-01 02:46:38,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:46:38,223 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:46:38,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:46:38,326 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 1 proven. 43 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-01 02:46:38,326 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:46:38,327 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [558915983] [2023-04-01 02:46:38,327 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [558915983] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:46:38,327 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [302510992] [2023-04-01 02:46:38,327 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 02:46:38,327 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:46:38,327 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:46:38,328 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) [2023-04-01 02:46:38,345 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-01 02:46:38,431 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 02:46:38,431 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 02:46:38,432 INFO L262 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 7 conjunts are in the unsatisfiable core [2023-04-01 02:46:38,434 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:46:38,485 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 29 proven. 13 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 02:46:38,485 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 02:46:38,564 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 3 proven. 30 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-04-01 02:46:38,564 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [302510992] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 02:46:38,564 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [602488642] [2023-04-01 02:46:38,568 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-01 02:46:38,568 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 02:46:38,568 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 02:46:38,568 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 02:46:38,569 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 02:46:38,587 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-01 02:46:38,876 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 37 for LOIs [2023-04-01 02:46:38,921 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 02:46:38,925 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 02:46:40,146 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1104#(and (<= ~N~0 (+ main_~i~1 1)) (<= 1 |#StackHeapBarrier|) (<= 0 (+ main_~ret2~0 2147483648)) (<= ~N~0 2147483647) (<= main_~ret~1 2147483647) (<= main_~ret5~0 2147483647) (or (not (= main_~ret~1 main_~ret5~0)) (not (= main_~ret~1 main_~ret2~0))) (<= 0 (+ main_~ret5~0 2147483648)) (<= 0 (+ main_~ret~1 2147483648)) (<= main_~ret2~0 2147483647) (= |main_~#x~0.offset| 0) (<= 2 ~N~0) (= |old(~N~0)| 0) (= |#NULL.offset| 0) (<= (+ |#StackHeapBarrier| 1) |main_~#x~0.base|) (= |#NULL.base| 0))' at error location [2023-04-01 02:46:40,146 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 02:46:40,146 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 02:46:40,146 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 14 [2023-04-01 02:46:40,147 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [985624917] [2023-04-01 02:46:40,147 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 02:46:40,147 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-04-01 02:46:40,147 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:46:40,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-04-01 02:46:40,148 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=814, Unknown=8, NotChecked=0, Total=930 [2023-04-01 02:46:40,154 INFO L87 Difference]: Start difference. First operand 41 states and 54 transitions. Second operand has 14 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 14 states have internal predecessors, (34), 3 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2023-04-01 02:46:40,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:46:40,351 INFO L93 Difference]: Finished difference Result 66 states and 83 transitions. [2023-04-01 02:46:40,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-04-01 02:46:40,352 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 14 states have internal predecessors, (34), 3 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 32 [2023-04-01 02:46:40,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:46:40,353 INFO L225 Difference]: With dead ends: 66 [2023-04-01 02:46:40,353 INFO L226 Difference]: Without dead ends: 28 [2023-04-01 02:46:40,353 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 72 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 450 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=173, Invalid=1379, Unknown=8, NotChecked=0, Total=1560 [2023-04-01 02:46:40,354 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 25 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 208 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 208 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 02:46:40,354 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 124 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 208 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 02:46:40,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-04-01 02:46:40,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 24. [2023-04-01 02:46:40,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 02:46:40,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2023-04-01 02:46:40,358 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 32 [2023-04-01 02:46:40,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:46:40,358 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2023-04-01 02:46:40,358 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 14 states have internal predecessors, (34), 3 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2023-04-01 02:46:40,358 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2023-04-01 02:46:40,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-04-01 02:46:40,359 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:46:40,359 INFO L195 NwaCegarLoop]: trace histogram [9, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:46:40,366 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-01 02:46:40,564 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:46:40,564 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:46:40,565 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:46:40,565 INFO L85 PathProgramCache]: Analyzing trace with hash -1303271545, now seen corresponding path program 4 times [2023-04-01 02:46:40,565 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:46:40,565 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1350966124] [2023-04-01 02:46:40,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:46:40,565 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:46:40,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat