/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 EqDomain -i ../sv-benchmarks/c/array-examples/standard_copy6_ground-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 08:41:18,000 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 08:41:18,002 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 08:41:18,032 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 08:41:18,034 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 08:41:18,036 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 08:41:18,040 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 08:41:18,042 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 08:41:18,043 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 08:41:18,046 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 08:41:18,047 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 08:41:18,049 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 08:41:18,049 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 08:41:18,052 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 08:41:18,053 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 08:41:18,054 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 08:41:18,055 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 08:41:18,055 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 08:41:18,056 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 08:41:18,060 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 08:41:18,061 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 08:41:18,062 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 08:41:18,062 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 08:41:18,063 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 08:41:18,069 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-04-01 08:41:18,072 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 08:41:18,072 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 08:41:18,073 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 08:41:18,073 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 08:41:18,074 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 08:41:18,074 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 08:41:18,074 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 08:41:18,075 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 08:41:18,075 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 08:41:18,075 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 08:41:18,076 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 08:41:18,076 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 08:41:18,102 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 08:41:18,102 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 08:41:18,102 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 08:41:18,102 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 08:41:18,103 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 08:41:18,103 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 08:41:18,103 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 08:41:18,103 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 08:41:18,103 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 08:41:18,103 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 08:41:18,104 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 08:41:18,104 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 08:41:18,104 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 08:41:18,104 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 08:41:18,104 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 08:41:18,104 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 08:41:18,105 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 08:41:18,105 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 08:41:18,105 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 08:41:18,105 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 08:41:18,105 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 08:41:18,105 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 08:41:18,105 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 08:41:18,105 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 08:41:18,106 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 08:41:18,106 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 08:41:18,106 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 08:41:18,106 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 08:41:18,106 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 08:41:18,106 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 08:41:18,106 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 08:41:18,106 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 08:41:18,107 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 08:41:18,107 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 08:41:18,107 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 08:41:18,107 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 08:41:18,107 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 08:41:18,107 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 08:41:18,107 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 08:41:18,107 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 08:41:18,107 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 08:41:18,107 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> EqDomain [2023-04-01 08:41:18,279 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 08:41:18,296 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 08:41:18,298 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 08:41:18,298 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 08:41:18,299 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 08:41:18,300 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_copy6_ground-1.i [2023-04-01 08:41:19,223 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 08:41:19,365 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 08:41:19,365 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_copy6_ground-1.i [2023-04-01 08:41:19,371 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/992f4928d/34c54e199a0b48828d0483739332e3d3/FLAG711e1e053 [2023-04-01 08:41:19,381 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/992f4928d/34c54e199a0b48828d0483739332e3d3 [2023-04-01 08:41:19,383 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 08:41:19,384 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 08:41:19,384 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 08:41:19,385 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 08:41:19,387 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 08:41:19,387 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 08:41:19" (1/1) ... [2023-04-01 08:41:19,389 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4d1f9eb3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:41:19, skipping insertion in model container [2023-04-01 08:41:19,389 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 08:41:19" (1/1) ... [2023-04-01 08:41:19,394 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 08:41:19,404 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 08:41:19,509 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-examples/standard_copy6_ground-1.i[816,829] [2023-04-01 08:41:19,527 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 08:41:19,534 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 08:41:19,542 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-examples/standard_copy6_ground-1.i[816,829] [2023-04-01 08:41:19,549 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 08:41:19,559 INFO L208 MainTranslator]: Completed translation [2023-04-01 08:41:19,559 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:41:19 WrapperNode [2023-04-01 08:41:19,559 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 08:41:19,560 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 08:41:19,560 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 08:41:19,560 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 08:41:19,568 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:41:19" (1/1) ... [2023-04-01 08:41:19,568 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:41:19" (1/1) ... [2023-04-01 08:41:19,575 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:41:19" (1/1) ... [2023-04-01 08:41:19,575 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:41:19" (1/1) ... [2023-04-01 08:41:19,581 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:41:19" (1/1) ... [2023-04-01 08:41:19,585 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:41:19" (1/1) ... [2023-04-01 08:41:19,586 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:41:19" (1/1) ... [2023-04-01 08:41:19,587 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:41:19" (1/1) ... [2023-04-01 08:41:19,589 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 08:41:19,589 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 08:41:19,589 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 08:41:19,589 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 08:41:19,590 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:41:19" (1/1) ... [2023-04-01 08:41:19,601 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 08:41:19,607 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:41:19,617 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 08:41:19,623 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 08:41:19,644 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 08:41:19,644 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 08:41:19,644 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 08:41:19,644 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-01 08:41:19,644 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 08:41:19,644 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 08:41:19,644 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 08:41:19,644 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-04-01 08:41:19,645 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-04-01 08:41:19,645 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 08:41:19,645 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 08:41:19,645 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 08:41:19,645 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 08:41:19,645 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 08:41:19,645 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-01 08:41:19,645 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 08:41:19,645 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 08:41:19,645 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 08:41:19,645 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 08:41:19,646 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 08:41:19,646 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 08:41:19,711 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 08:41:19,712 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 08:41:19,905 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 08:41:19,944 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 08:41:19,945 INFO L302 CfgBuilder]: Removed 8 assume(true) statements. [2023-04-01 08:41:19,947 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 08:41:19 BoogieIcfgContainer [2023-04-01 08:41:19,947 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 08:41:19,948 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 08:41:19,948 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 08:41:19,950 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 08:41:19,950 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 08:41:19" (1/3) ... [2023-04-01 08:41:19,951 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3094aecd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 08:41:19, skipping insertion in model container [2023-04-01 08:41:19,951 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:41:19" (2/3) ... [2023-04-01 08:41:19,951 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3094aecd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 08:41:19, skipping insertion in model container [2023-04-01 08:41:19,951 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 08:41:19" (3/3) ... [2023-04-01 08:41:19,952 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_copy6_ground-1.i [2023-04-01 08:41:19,964 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 08:41:19,965 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 08:41:19,996 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 08:41:20,001 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;@756a936c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 08:41:20,001 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 08:41:20,005 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 16 states have (on average 1.625) internal successors, (26), 17 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 08:41:20,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-04-01 08:41:20,010 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:41:20,011 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:41:20,011 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:41:20,017 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:41:20,018 INFO L85 PathProgramCache]: Analyzing trace with hash -627708306, now seen corresponding path program 1 times [2023-04-01 08:41:20,024 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:41:20,024 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922156631] [2023-04-01 08:41:20,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:41:20,025 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:41:20,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:41:20,277 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:41:20,277 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:41:20,278 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922156631] [2023-04-01 08:41:20,279 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [922156631] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 08:41:20,279 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 08:41:20,280 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 08:41:20,281 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1939178901] [2023-04-01 08:41:20,282 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 08:41:20,285 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 08:41:20,285 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:41:20,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 08:41:20,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 08:41:20,311 INFO L87 Difference]: Start difference. First operand has 24 states, 16 states have (on average 1.625) internal successors, (26), 17 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:41:20,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:41:20,361 INFO L93 Difference]: Finished difference Result 43 states and 60 transitions. [2023-04-01 08:41:20,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 08:41:20,366 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2023-04-01 08:41:20,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:41:20,370 INFO L225 Difference]: With dead ends: 43 [2023-04-01 08:41:20,370 INFO L226 Difference]: Without dead ends: 22 [2023-04-01 08:41:20,372 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 08:41:20,374 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 08:41:20,375 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 27 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 08:41:20,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-04-01 08:41:20,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-04-01 08:41:20,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 16 states have (on average 1.5) internal successors, (24), 16 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 08:41:20,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 29 transitions. [2023-04-01 08:41:20,396 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 29 transitions. Word has length 17 [2023-04-01 08:41:20,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:41:20,396 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 29 transitions. [2023-04-01 08:41:20,396 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:41:20,396 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 29 transitions. [2023-04-01 08:41:20,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-04-01 08:41:20,397 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:41:20,397 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:41:20,397 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 08:41:20,397 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:41:20,398 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:41:20,398 INFO L85 PathProgramCache]: Analyzing trace with hash 864931605, now seen corresponding path program 1 times [2023-04-01 08:41:20,398 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:41:20,398 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [285836653] [2023-04-01 08:41:20,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:41:20,398 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:41:20,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:41:20,463 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 08:41:20,463 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:41:20,463 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [285836653] [2023-04-01 08:41:20,463 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [285836653] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 08:41:20,463 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 08:41:20,463 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 08:41:20,464 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [61481033] [2023-04-01 08:41:20,464 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 08:41:20,465 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 08:41:20,465 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:41:20,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 08:41:20,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 08:41:20,466 INFO L87 Difference]: Start difference. First operand 22 states and 29 transitions. Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:41:20,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:41:20,496 INFO L93 Difference]: Finished difference Result 42 states and 60 transitions. [2023-04-01 08:41:20,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 08:41:20,497 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2023-04-01 08:41:20,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:41:20,498 INFO L225 Difference]: With dead ends: 42 [2023-04-01 08:41:20,498 INFO L226 Difference]: Without dead ends: 28 [2023-04-01 08:41:20,498 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 08:41:20,499 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 08:41:20,499 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 24 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 08:41:20,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-04-01 08:41:20,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2023-04-01 08:41:20,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 22 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 08:41:20,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2023-04-01 08:41:20,503 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 18 [2023-04-01 08:41:20,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:41:20,504 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2023-04-01 08:41:20,504 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:41:20,504 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2023-04-01 08:41:20,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-04-01 08:41:20,505 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:41:20,505 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, 1, 1, 1] [2023-04-01 08:41:20,505 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-01 08:41:20,505 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:41:20,505 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:41:20,505 INFO L85 PathProgramCache]: Analyzing trace with hash -1314296630, now seen corresponding path program 1 times [2023-04-01 08:41:20,506 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:41:20,506 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1700001579] [2023-04-01 08:41:20,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:41:20,506 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:41:20,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:41:20,624 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 08:41:20,624 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:41:20,624 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1700001579] [2023-04-01 08:41:20,624 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1700001579] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:41:20,625 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [193801826] [2023-04-01 08:41:20,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:41:20,625 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:41:20,625 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:41:20,628 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 08:41:20,629 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 08:41:20,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:41:20,739 INFO L262 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-01 08:41:20,744 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:41:20,780 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 08:41:20,780 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:41:20,812 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 08:41:20,813 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [193801826] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:41:20,815 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [420501152] [2023-04-01 08:41:20,847 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:41:20,847 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:41:20,850 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:41:20,853 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:41:20,853 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:41:20,963 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 08:41:22,128 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 68 for LOIs [2023-04-01 08:41:22,174 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 08:41:22,177 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:41:22,958 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '405#(and (exists ((|v_main_~#a1~0.base_BEFORE_CALL_1| Int) (|v_old(#length)_BEFORE_CALL_1| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_1| (Array Int (Array Int Int))) (|v_main_~#a7~0.base_BEFORE_CALL_1| Int) (|v_old(#valid)_BEFORE_CALL_1| (Array Int Int))) (and (not (= |v_old(#valid)_BEFORE_CALL_1| |v_old(#length)_BEFORE_CALL_1|)) (not (= |#StackHeapBarrier| |v_main_~#a7~0.base_BEFORE_CALL_1|)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_1| 1) |v_old(#valid)_BEFORE_CALL_1|)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_1| 1) 0)) (= (select |v_old(#valid)_BEFORE_CALL_1| 1) 1) (not (= |#StackHeapBarrier| |v_main_~#a1~0.base_BEFORE_CALL_1|)) (= (select |v_old(#length)_BEFORE_CALL_1| 2) 26) (= (select |v_old(#valid)_BEFORE_CALL_1| |v_main_~#a1~0.base_BEFORE_CALL_1|) 0) (not (= |v_main_~#a1~0.base_BEFORE_CALL_1| 1)) (= 2 (select |v_old(#length)_BEFORE_CALL_1| 1)) (= (select |v_old(#valid)_BEFORE_CALL_1| 2) 1) (not (= (select |v_old(#memory_int)_BEFORE_CALL_1| 1) |v_old(#length)_BEFORE_CALL_1|)) (not (= (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_1|) 0) (select (select |#memory_int| |v_main_~#a7~0.base_BEFORE_CALL_1|) 0))) (not (= 2 |v_main_~#a1~0.base_BEFORE_CALL_1|)) (= (select |v_old(#valid)_BEFORE_CALL_1| 0) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_1| 1) 1) 0) (not (= |v_main_~#a7~0.base_BEFORE_CALL_1| 0)) (not (= |v_main_~#a1~0.base_BEFORE_CALL_1| 0)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:41:22,958 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:41:22,958 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:41:22,958 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-01 08:41:22,958 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824470570] [2023-04-01 08:41:22,959 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:41:22,959 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-01 08:41:22,959 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:41:22,960 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-01 08:41:22,960 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2023-04-01 08:41:22,960 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:41:23,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:41:23,024 INFO L93 Difference]: Finished difference Result 52 states and 68 transitions. [2023-04-01 08:41:23,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-01 08:41:23,025 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2023-04-01 08:41:23,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:41:23,025 INFO L225 Difference]: With dead ends: 52 [2023-04-01 08:41:23,025 INFO L226 Difference]: Without dead ends: 31 [2023-04-01 08:41:23,026 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2023-04-01 08:41:23,026 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:41:23,027 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 45 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:41:23,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-04-01 08:41:23,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2023-04-01 08:41:23,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 25 states have (on average 1.32) internal successors, (33), 25 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 08:41:23,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2023-04-01 08:41:23,034 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 24 [2023-04-01 08:41:23,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:41:23,034 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2023-04-01 08:41:23,034 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:41:23,035 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2023-04-01 08:41:23,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-04-01 08:41:23,035 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:41:23,035 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:41:23,043 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 08:41:23,241 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:41:23,241 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:41:23,242 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:41:23,242 INFO L85 PathProgramCache]: Analyzing trace with hash -410843357, now seen corresponding path program 2 times [2023-04-01 08:41:23,242 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:41:23,242 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [665907509] [2023-04-01 08:41:23,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:41:23,242 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:41:23,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:41:23,332 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-01 08:41:23,333 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:41:23,333 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [665907509] [2023-04-01 08:41:23,333 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [665907509] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:41:23,334 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [923657576] [2023-04-01 08:41:23,334 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 08:41:23,335 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:41:23,336 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:41:23,336 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 08:41:23,339 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 08:41:23,428 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-01 08:41:23,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:41:23,429 INFO L262 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-01 08:41:23,431 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:41:23,440 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-01 08:41:23,441 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:41:23,453 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-01 08:41:23,454 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [923657576] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:41:23,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1471090226] [2023-04-01 08:41:23,456 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:41:23,456 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:41:23,457 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:41:23,457 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:41:23,457 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:41:23,480 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 08:41:24,149 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 68 for LOIs [2023-04-01 08:41:24,169 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 08:41:24,171 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:41:24,803 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '727#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (exists ((|v_main_~#a1~0.base_BEFORE_CALL_2| Int) (|v_old(#valid)_BEFORE_CALL_2| (Array Int Int)) (|v_old(#length)_BEFORE_CALL_2| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_2| (Array Int (Array Int Int))) (|v_main_~#a7~0.base_BEFORE_CALL_2| Int)) (and (= 2 (select |v_old(#length)_BEFORE_CALL_2| 1)) (not (= |#StackHeapBarrier| |v_main_~#a7~0.base_BEFORE_CALL_2|)) (= (select |v_old(#valid)_BEFORE_CALL_2| |v_main_~#a1~0.base_BEFORE_CALL_2|) 0) (not (= |v_main_~#a7~0.base_BEFORE_CALL_2| 0)) (= (select |v_old(#length)_BEFORE_CALL_2| 2) 26) (not (= |v_main_~#a1~0.base_BEFORE_CALL_2| 0)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_2| 1) 1) 0) (not (= 2 |v_main_~#a1~0.base_BEFORE_CALL_2|)) (= (select |v_old(#valid)_BEFORE_CALL_2| 0) 0) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_2| 1) 0)) (not (= |#StackHeapBarrier| |v_main_~#a1~0.base_BEFORE_CALL_2|)) (not (= (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_2|) 0) (select (select |#memory_int| |v_main_~#a7~0.base_BEFORE_CALL_2|) 0))) (not (= |v_old(#length)_BEFORE_CALL_2| (select |v_old(#memory_int)_BEFORE_CALL_2| 1))) (not (= |v_old(#valid)_BEFORE_CALL_2| (select |v_old(#memory_int)_BEFORE_CALL_2| 1))) (not (= |v_old(#valid)_BEFORE_CALL_2| |v_old(#length)_BEFORE_CALL_2|)) (= (select |v_old(#valid)_BEFORE_CALL_2| 2) 1) (not (= |v_main_~#a1~0.base_BEFORE_CALL_2| 1)) (= (select |v_old(#valid)_BEFORE_CALL_2| 1) 1))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:41:24,804 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:41:24,804 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:41:24,804 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-01 08:41:24,804 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585887212] [2023-04-01 08:41:24,804 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:41:24,804 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-01 08:41:24,804 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:41:24,805 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-01 08:41:24,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2023-04-01 08:41:24,805 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 states have internal predecessors, (32), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:41:24,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:41:24,868 INFO L93 Difference]: Finished difference Result 68 states and 98 transitions. [2023-04-01 08:41:24,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-01 08:41:24,868 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 states have internal predecessors, (32), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2023-04-01 08:41:24,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:41:24,869 INFO L225 Difference]: With dead ends: 68 [2023-04-01 08:41:24,869 INFO L226 Difference]: Without dead ends: 49 [2023-04-01 08:41:24,869 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2023-04-01 08:41:24,870 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:41:24,870 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 36 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:41:24,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2023-04-01 08:41:24,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2023-04-01 08:41:24,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 43 states have (on average 1.186046511627907) internal successors, (51), 43 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 08:41:24,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 56 transitions. [2023-04-01 08:41:24,874 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 56 transitions. Word has length 27 [2023-04-01 08:41:24,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:41:24,874 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 56 transitions. [2023-04-01 08:41:24,875 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 states have internal predecessors, (32), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:41:24,875 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 56 transitions. [2023-04-01 08:41:24,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-04-01 08:41:24,875 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:41:24,875 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:41:24,883 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 08:41:25,081 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,SelfDestructingSolverStorable3 [2023-04-01 08:41:25,081 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:41:25,081 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:41:25,081 INFO L85 PathProgramCache]: Analyzing trace with hash 275021550, now seen corresponding path program 3 times [2023-04-01 08:41:25,082 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:41:25,082 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1344508013] [2023-04-01 08:41:25,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:41:25,082 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:41:25,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:41:25,213 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-01 08:41:25,213 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:41:25,213 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1344508013] [2023-04-01 08:41:25,213 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1344508013] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:41:25,214 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [65022741] [2023-04-01 08:41:25,214 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 08:41:25,214 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:41:25,214 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:41:25,215 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 08:41:25,217 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 08:41:25,319 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 08:41:25,319 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:41:25,321 INFO L262 TraceCheckSpWp]: Trace formula consists of 425 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-01 08:41:25,323 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:41:25,333 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-01 08:41:25,333 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:41:25,373 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-01 08:41:25,373 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [65022741] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:41:25,373 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1227707665] [2023-04-01 08:41:25,374 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:41:25,374 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:41:25,375 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:41:25,375 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:41:25,375 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:41:25,402 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 08:41:26,051 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 68 for LOIs [2023-04-01 08:41:26,082 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 08:41:26,084 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:41:26,710 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1231#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0) (exists ((|v_main_~#a1~0.base_BEFORE_CALL_3| Int) (|v_main_~#a7~0.base_BEFORE_CALL_3| Int) (|v_old(#length)_BEFORE_CALL_3| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_3| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_3| (Array Int Int))) (and (= (select (select |v_old(#memory_int)_BEFORE_CALL_3| 1) 0) 48) (= 0 (select |v_old(#valid)_BEFORE_CALL_3| |v_main_~#a1~0.base_BEFORE_CALL_3|)) (not (= |#StackHeapBarrier| |v_main_~#a7~0.base_BEFORE_CALL_3|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_3| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_3| 0) 0) (not (= |v_old(#valid)_BEFORE_CALL_3| |v_old(#length)_BEFORE_CALL_3|)) (= 2 (select |v_old(#length)_BEFORE_CALL_3| 1)) (not (= |v_old(#length)_BEFORE_CALL_3| (select |v_old(#memory_int)_BEFORE_CALL_3| 1))) (not (= |v_main_~#a7~0.base_BEFORE_CALL_3| 0)) (= (select |v_old(#length)_BEFORE_CALL_3| 2) 26) (not (= |v_old(#valid)_BEFORE_CALL_3| (select |v_old(#memory_int)_BEFORE_CALL_3| 1))) (= (select |v_old(#valid)_BEFORE_CALL_3| 2) 1) (not (= |#StackHeapBarrier| |v_main_~#a1~0.base_BEFORE_CALL_3|)) (not (= 2 |v_main_~#a1~0.base_BEFORE_CALL_3|)) (not (= |v_main_~#a1~0.base_BEFORE_CALL_3| 1)) (not (= |v_main_~#a1~0.base_BEFORE_CALL_3| 0)) (= (select |v_old(#valid)_BEFORE_CALL_3| 1) 1) (not (= (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_3|) 0) (select (select |#memory_int| |v_main_~#a7~0.base_BEFORE_CALL_3|) 0))))))' at error location [2023-04-01 08:41:26,711 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:41:26,711 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:41:26,711 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2023-04-01 08:41:26,711 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753914953] [2023-04-01 08:41:26,711 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:41:26,712 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-04-01 08:41:26,712 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:41:26,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-04-01 08:41:26,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=400, Unknown=0, NotChecked=0, Total=506 [2023-04-01 08:41:26,713 INFO L87 Difference]: Start difference. First operand 49 states and 56 transitions. Second operand has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:41:26,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:41:26,769 INFO L93 Difference]: Finished difference Result 94 states and 113 transitions. [2023-04-01 08:41:26,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-01 08:41:26,770 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2023-04-01 08:41:26,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:41:26,770 INFO L225 Difference]: With dead ends: 94 [2023-04-01 08:41:26,770 INFO L226 Difference]: Without dead ends: 55 [2023-04-01 08:41:26,771 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 181 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=106, Invalid=400, Unknown=0, NotChecked=0, Total=506 [2023-04-01 08:41:26,771 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:41:26,771 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 56 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:41:26,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2023-04-01 08:41:26,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2023-04-01 08:41:26,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 49 states have (on average 1.163265306122449) internal successors, (57), 49 states have internal predecessors, (57), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 08:41:26,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 62 transitions. [2023-04-01 08:41:26,775 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 62 transitions. Word has length 45 [2023-04-01 08:41:26,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:41:26,775 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 62 transitions. [2023-04-01 08:41:26,775 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:41:26,775 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 62 transitions. [2023-04-01 08:41:26,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2023-04-01 08:41:26,776 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:41:26,776 INFO L195 NwaCegarLoop]: trace histogram [10, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:41:26,783 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 08:41:26,980 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:41:26,981 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:41:26,981 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:41:26,981 INFO L85 PathProgramCache]: Analyzing trace with hash -521968242, now seen corresponding path program 4 times [2023-04-01 08:41:26,981 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:41:26,981 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1350787418] [2023-04-01 08:41:26,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:41:26,981 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:41:27,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:41:27,270 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-01 08:41:27,271 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:41:27,271 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1350787418] [2023-04-01 08:41:27,271 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1350787418] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:41:27,271 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1217819252] [2023-04-01 08:41:27,271 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 08:41:27,271 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:41:27,271 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:41:27,272 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 08:41:27,273 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 08:41:27,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:41:27,412 INFO L262 TraceCheckSpWp]: Trace formula consists of 527 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-01 08:41:27,414 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:41:27,434 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-01 08:41:27,434 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:41:27,568 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-01 08:41:27,569 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1217819252] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:41:27,569 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1120699621] [2023-04-01 08:41:27,570 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:41:27,570 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:41:27,570 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:41:27,570 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:41:27,570 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:41:27,597 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 08:41:28,159 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 68 for LOIs [2023-04-01 08:41:28,187 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 08:41:28,189 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:41:28,869 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1847#(and (exists ((|v_main_~#a1~0.base_BEFORE_CALL_4| Int) (|v_old(#memory_int)_BEFORE_CALL_4| (Array Int (Array Int Int))) (|v_main_~#a7~0.base_BEFORE_CALL_4| Int) (|v_old(#valid)_BEFORE_CALL_4| (Array Int Int)) (|v_old(#length)_BEFORE_CALL_4| (Array Int Int))) (and (= (select |v_old(#length)_BEFORE_CALL_4| 1) 2) (not (= (select (select |#memory_int| |v_main_~#a7~0.base_BEFORE_CALL_4|) 0) (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_4|) 0))) (not (= |v_main_~#a1~0.base_BEFORE_CALL_4| 1)) (not (= |#StackHeapBarrier| |v_main_~#a7~0.base_BEFORE_CALL_4|)) (not (= 2 |v_main_~#a1~0.base_BEFORE_CALL_4|)) (= (select |v_old(#valid)_BEFORE_CALL_4| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_4| |v_main_~#a1~0.base_BEFORE_CALL_4|) 0) (= (select |v_old(#valid)_BEFORE_CALL_4| 0) 0) (not (= |v_old(#valid)_BEFORE_CALL_4| |v_old(#length)_BEFORE_CALL_4|)) (not (= |v_main_~#a1~0.base_BEFORE_CALL_4| 0)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_4| 1) |v_old(#length)_BEFORE_CALL_4|)) (not (= |v_main_~#a7~0.base_BEFORE_CALL_4| 0)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_4| 1) 1) 0) (= (select |v_old(#length)_BEFORE_CALL_4| 2) 26) (not (= |#StackHeapBarrier| |v_main_~#a1~0.base_BEFORE_CALL_4|)) (not (= |v_old(#valid)_BEFORE_CALL_4| (select |v_old(#memory_int)_BEFORE_CALL_4| 1))) (= (select |v_old(#valid)_BEFORE_CALL_4| 2) 1) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_4| 1) 0)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:41:28,869 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:41:28,869 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:41:28,869 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2023-04-01 08:41:28,870 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992023358] [2023-04-01 08:41:28,870 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:41:28,870 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-04-01 08:41:28,870 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:41:28,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-04-01 08:41:28,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=328, Invalid=862, Unknown=0, NotChecked=0, Total=1190 [2023-04-01 08:41:28,871 INFO L87 Difference]: Start difference. First operand 55 states and 62 transitions. Second operand has 25 states, 25 states have (on average 1.72) internal successors, (43), 25 states have internal predecessors, (43), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:41:28,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:41:28,945 INFO L93 Difference]: Finished difference Result 106 states and 131 transitions. [2023-04-01 08:41:28,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-04-01 08:41:28,945 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.72) internal successors, (43), 25 states have internal predecessors, (43), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2023-04-01 08:41:28,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:41:28,946 INFO L225 Difference]: With dead ends: 106 [2023-04-01 08:41:28,946 INFO L226 Difference]: Without dead ends: 67 [2023-04-01 08:41:28,947 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 385 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=328, Invalid=862, Unknown=0, NotChecked=0, Total=1190 [2023-04-01 08:41:28,947 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:41:28,947 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 78 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:41:28,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2023-04-01 08:41:28,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2023-04-01 08:41:28,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 61 states have (on average 1.1311475409836065) internal successors, (69), 61 states have internal predecessors, (69), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 08:41:28,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 74 transitions. [2023-04-01 08:41:28,952 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 74 transitions. Word has length 51 [2023-04-01 08:41:28,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:41:28,952 INFO L495 AbstractCegarLoop]: Abstraction has 67 states and 74 transitions. [2023-04-01 08:41:28,952 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.72) internal successors, (43), 25 states have internal predecessors, (43), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:41:28,952 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 74 transitions. [2023-04-01 08:41:28,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2023-04-01 08:41:28,953 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:41:28,953 INFO L195 NwaCegarLoop]: trace histogram [22, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:41:28,961 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 08:41:29,161 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:41:29,161 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:41:29,161 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:41:29,161 INFO L85 PathProgramCache]: Analyzing trace with hash -1858286898, now seen corresponding path program 5 times [2023-04-01 08:41:29,161 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:41:29,162 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [669455686] [2023-04-01 08:41:29,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:41:29,162 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:41:29,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:41:29,682 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-01 08:41:29,682 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:41:29,682 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [669455686] [2023-04-01 08:41:29,682 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [669455686] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:41:29,683 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1586917527] [2023-04-01 08:41:29,683 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 08:41:29,683 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:41:29,683 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:41:29,684 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) [2023-04-01 08:41:29,684 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-01 08:41:29,892 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-01 08:41:29,911 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:41:29,916 INFO L262 TraceCheckSpWp]: Trace formula consists of 425 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-01 08:41:29,919 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:41:29,994 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 303 trivial. 0 not checked. [2023-04-01 08:41:29,994 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:41:30,065 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 303 trivial. 0 not checked. [2023-04-01 08:41:30,065 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1586917527] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:41:30,065 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [613586587] [2023-04-01 08:41:30,066 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:41:30,066 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:41:30,067 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:41:30,067 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:41:30,067 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:41:30,089 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 08:41:30,580 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 68 for LOIs [2023-04-01 08:41:30,598 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 08:41:30,600 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:41:31,347 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2593#(and (exists ((|v_old(#memory_int)_BEFORE_CALL_5| (Array Int (Array Int Int))) (|v_main_~#a7~0.base_BEFORE_CALL_5| Int) (|v_old(#length)_BEFORE_CALL_5| (Array Int Int)) (|v_old(#valid)_BEFORE_CALL_5| (Array Int Int)) (|v_main_~#a1~0.base_BEFORE_CALL_5| Int)) (and (not (= |v_old(#valid)_BEFORE_CALL_5| (select |v_old(#memory_int)_BEFORE_CALL_5| 1))) (not (= 2 |v_main_~#a1~0.base_BEFORE_CALL_5|)) (= (select |v_old(#valid)_BEFORE_CALL_5| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_5| |v_main_~#a1~0.base_BEFORE_CALL_5|) 0) (not (= |v_main_~#a1~0.base_BEFORE_CALL_5| 1)) (not (= |v_main_~#a1~0.base_BEFORE_CALL_5| 0)) (not (= (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_5|) 0) (select (select |#memory_int| |v_main_~#a7~0.base_BEFORE_CALL_5|) 0))) (= (select |v_old(#valid)_BEFORE_CALL_5| 2) 1) (not (= |#StackHeapBarrier| |v_main_~#a1~0.base_BEFORE_CALL_5|)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_5| 1) 0)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_5| 1) 1) 0) (not (= |v_main_~#a7~0.base_BEFORE_CALL_5| 0)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_5| 1) |v_old(#length)_BEFORE_CALL_5|)) (= (select |v_old(#valid)_BEFORE_CALL_5| 0) 0) (= 26 (select |v_old(#length)_BEFORE_CALL_5| 2)) (not (= |v_old(#valid)_BEFORE_CALL_5| |v_old(#length)_BEFORE_CALL_5|)) (= 2 (select |v_old(#length)_BEFORE_CALL_5| 1)) (not (= |#StackHeapBarrier| |v_main_~#a7~0.base_BEFORE_CALL_5|)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:41:31,347 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:41:31,347 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:41:31,347 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 7, 7] total 35 [2023-04-01 08:41:31,347 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [509865683] [2023-04-01 08:41:31,347 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:41:31,348 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-04-01 08:41:31,348 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:41:31,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-04-01 08:41:31,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=393, Invalid=1587, Unknown=0, NotChecked=0, Total=1980 [2023-04-01 08:41:31,351 INFO L87 Difference]: Start difference. First operand 67 states and 74 transitions. Second operand has 35 states, 35 states have (on average 1.6285714285714286) internal successors, (57), 35 states have internal predecessors, (57), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:41:31,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:41:31,515 INFO L93 Difference]: Finished difference Result 143 states and 193 transitions. [2023-04-01 08:41:31,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2023-04-01 08:41:31,515 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.6285714285714286) internal successors, (57), 35 states have internal predecessors, (57), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 63 [2023-04-01 08:41:31,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:41:31,516 INFO L225 Difference]: With dead ends: 143 [2023-04-01 08:41:31,516 INFO L226 Difference]: Without dead ends: 104 [2023-04-01 08:41:31,517 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 585 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=393, Invalid=1587, Unknown=0, NotChecked=0, Total=1980 [2023-04-01 08:41:31,517 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:41:31,518 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 105 Invalid, 275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 164 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:41:31,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2023-04-01 08:41:31,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2023-04-01 08:41:31,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 98 states have (on average 1.0816326530612246) internal successors, (106), 98 states have internal predecessors, (106), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 08:41:31,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 111 transitions. [2023-04-01 08:41:31,544 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 111 transitions. Word has length 63 [2023-04-01 08:41:31,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:41:31,544 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 111 transitions. [2023-04-01 08:41:31,544 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.6285714285714286) internal successors, (57), 35 states have internal predecessors, (57), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:41:31,545 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 111 transitions. [2023-04-01 08:41:31,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2023-04-01 08:41:31,546 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:41:31,546 INFO L195 NwaCegarLoop]: trace histogram [23, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:41:31,557 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-04-01 08:41:31,755 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:41:31,758 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:41:31,758 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:41:31,758 INFO L85 PathProgramCache]: Analyzing trace with hash -144217643, now seen corresponding path program 6 times [2023-04-01 08:41:31,758 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:41:31,758 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1462337380] [2023-04-01 08:41:31,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:41:31,758 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:41:31,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:41:32,482 INFO L134 CoverageAnalysis]: Checked inductivity of 606 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2023-04-01 08:41:32,482 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:41:32,482 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1462337380] [2023-04-01 08:41:32,482 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1462337380] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:41:32,482 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2089293054] [2023-04-01 08:41:32,482 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 08:41:32,482 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:41:32,482 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:41:32,483 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) [2023-04-01 08:41:32,485 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-01 08:41:32,722 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 08:41:32,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:41:32,726 INFO L262 TraceCheckSpWp]: Trace formula consists of 1000 conjuncts, 25 conjunts are in the unsatisfiable core [2023-04-01 08:41:32,728 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:41:32,758 INFO L134 CoverageAnalysis]: Checked inductivity of 606 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2023-04-01 08:41:32,758 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:41:33,307 INFO L134 CoverageAnalysis]: Checked inductivity of 606 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2023-04-01 08:41:33,307 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2089293054] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:41:33,307 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1486650790] [2023-04-01 08:41:33,308 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:41:33,308 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:41:33,308 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:41:33,309 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:41:33,309 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:41:33,324 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 08:41:33,822 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 68 for LOIs [2023-04-01 08:41:33,839 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 08:41:33,841 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:41:34,553 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3725#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (exists ((|v_old(#valid)_BEFORE_CALL_6| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_6| (Array Int (Array Int Int))) (|v_main_~#a7~0.base_BEFORE_CALL_6| Int) (|v_old(#length)_BEFORE_CALL_6| (Array Int Int)) (|v_main_~#a1~0.base_BEFORE_CALL_6| Int)) (and (not (= |v_main_~#a1~0.base_BEFORE_CALL_6| 0)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_6| 1) 1) 0) (not (= 2 |v_main_~#a1~0.base_BEFORE_CALL_6|)) (not (= |v_old(#valid)_BEFORE_CALL_6| |v_old(#length)_BEFORE_CALL_6|)) (not (= |#StackHeapBarrier| |v_main_~#a1~0.base_BEFORE_CALL_6|)) (not (= |#StackHeapBarrier| |v_main_~#a7~0.base_BEFORE_CALL_6|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_6| 1) 0) 48) (not (= (select |v_old(#memory_int)_BEFORE_CALL_6| 1) |v_old(#length)_BEFORE_CALL_6|)) (= (select |v_old(#valid)_BEFORE_CALL_6| 2) 1) (not (= |v_main_~#a7~0.base_BEFORE_CALL_6| 0)) (not (= |v_main_~#a1~0.base_BEFORE_CALL_6| 1)) (= (select |v_old(#length)_BEFORE_CALL_6| 1) 2) (not (= |v_old(#valid)_BEFORE_CALL_6| (select |v_old(#memory_int)_BEFORE_CALL_6| 1))) (= (select |v_old(#valid)_BEFORE_CALL_6| |v_main_~#a1~0.base_BEFORE_CALL_6|) 0) (= (select |v_old(#valid)_BEFORE_CALL_6| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_6| 0) 0) (= (select |v_old(#length)_BEFORE_CALL_6| 2) 26) (not (= (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_6|) 0) (select (select |#memory_int| |v_main_~#a7~0.base_BEFORE_CALL_6|) 0))))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:41:34,553 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:41:34,553 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:41:34,553 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2023-04-01 08:41:34,553 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757941686] [2023-04-01 08:41:34,553 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:41:34,554 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2023-04-01 08:41:34,554 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:41:34,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2023-04-01 08:41:34,556 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1303, Invalid=2357, Unknown=0, NotChecked=0, Total=3660 [2023-04-01 08:41:34,556 INFO L87 Difference]: Start difference. First operand 104 states and 111 transitions. Second operand has 51 states, 51 states have (on average 1.3529411764705883) internal successors, (69), 51 states have internal predecessors, (69), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:41:34,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:41:34,648 INFO L93 Difference]: Finished difference Result 204 states and 242 transitions. [2023-04-01 08:41:34,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2023-04-01 08:41:34,648 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.3529411764705883) internal successors, (69), 51 states have internal predecessors, (69), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 100 [2023-04-01 08:41:34,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:41:34,649 INFO L225 Difference]: With dead ends: 204 [2023-04-01 08:41:34,649 INFO L226 Difference]: Without dead ends: 129 [2023-04-01 08:41:34,650 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 266 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 827 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1303, Invalid=2357, Unknown=0, NotChecked=0, Total=3660 [2023-04-01 08:41:34,651 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 170 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 170 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:41:34,651 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 89 Invalid, 171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 170 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:41:34,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2023-04-01 08:41:34,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2023-04-01 08:41:34,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 123 states have (on average 1.065040650406504) internal successors, (131), 123 states have internal predecessors, (131), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 08:41:34,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 136 transitions. [2023-04-01 08:41:34,657 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 136 transitions. Word has length 100 [2023-04-01 08:41:34,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:41:34,657 INFO L495 AbstractCegarLoop]: Abstraction has 129 states and 136 transitions. [2023-04-01 08:41:34,657 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.3529411764705883) internal successors, (69), 51 states have internal predecessors, (69), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:41:34,657 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 136 transitions. [2023-04-01 08:41:34,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2023-04-01 08:41:34,659 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:41:34,659 INFO L195 NwaCegarLoop]: trace histogram [48, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:41:34,667 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-04-01 08:41:34,867 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:41:34,868 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:41:34,868 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:41:34,868 INFO L85 PathProgramCache]: Analyzing trace with hash 310338638, now seen corresponding path program 7 times [2023-04-01 08:41:34,868 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:41:34,868 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [220349452] [2023-04-01 08:41:34,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:41:34,869 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:41:34,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:41:36,776 INFO L134 CoverageAnalysis]: Checked inductivity of 1506 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2023-04-01 08:41:36,776 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:41:36,776 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [220349452] [2023-04-01 08:41:36,776 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [220349452] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:41:36,776 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1151981656] [2023-04-01 08:41:36,776 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 08:41:36,777 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:41:36,777 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:41:36,781 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) [2023-04-01 08:41:36,783 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-01 08:41:37,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:41:37,179 INFO L262 TraceCheckSpWp]: Trace formula consists of 1425 conjuncts, 50 conjunts are in the unsatisfiable core [2023-04-01 08:41:37,183 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:41:37,271 INFO L134 CoverageAnalysis]: Checked inductivity of 1506 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2023-04-01 08:41:37,271 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:41:39,399 INFO L134 CoverageAnalysis]: Checked inductivity of 1506 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2023-04-01 08:41:39,400 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1151981656] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:41:39,400 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [701285866] [2023-04-01 08:41:39,401 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:41:39,401 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:41:39,401 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:41:39,401 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:41:39,401 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:41:39,428 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 08:41:39,936 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 68 for LOIs [2023-04-01 08:41:39,977 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 08:41:39,979 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:41:40,840 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5229#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (exists ((|v_main_~#a7~0.base_BEFORE_CALL_7| Int) (|v_old(#valid)_BEFORE_CALL_7| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_7| (Array Int (Array Int Int))) (|v_old(#length)_BEFORE_CALL_7| (Array Int Int)) (|v_main_~#a1~0.base_BEFORE_CALL_7| Int)) (and (= (select |v_old(#valid)_BEFORE_CALL_7| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_7| 2) 1) (not (= |v_main_~#a1~0.base_BEFORE_CALL_7| 1)) (= (select |v_old(#valid)_BEFORE_CALL_7| 0) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_7| 1) 1) 0) (not (= |v_main_~#a1~0.base_BEFORE_CALL_7| 0)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_7| 1) 0) 48) (not (= (select |v_old(#memory_int)_BEFORE_CALL_7| 1) |v_old(#valid)_BEFORE_CALL_7|)) (not (= 2 |v_main_~#a1~0.base_BEFORE_CALL_7|)) (= 26 (select |v_old(#length)_BEFORE_CALL_7| 2)) (= 2 (select |v_old(#length)_BEFORE_CALL_7| 1)) (not (= |#StackHeapBarrier| |v_main_~#a1~0.base_BEFORE_CALL_7|)) (not (= (select (select |#memory_int| |v_main_~#a7~0.base_BEFORE_CALL_7|) 0) (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_7|) 0))) (not (= (select |v_old(#memory_int)_BEFORE_CALL_7| 1) |v_old(#length)_BEFORE_CALL_7|)) (not (= |#StackHeapBarrier| |v_main_~#a7~0.base_BEFORE_CALL_7|)) (= (select |v_old(#valid)_BEFORE_CALL_7| |v_main_~#a1~0.base_BEFORE_CALL_7|) 0) (not (= |v_main_~#a7~0.base_BEFORE_CALL_7| 0)) (not (= |v_old(#valid)_BEFORE_CALL_7| |v_old(#length)_BEFORE_CALL_7|)))) (= |#NULL.base| 0))' at error location [2023-04-01 08:41:40,841 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:41:40,841 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:41:40,841 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 101 [2023-04-01 08:41:40,843 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745180800] [2023-04-01 08:41:40,844 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:41:40,844 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2023-04-01 08:41:40,844 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:41:40,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2023-04-01 08:41:40,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5078, Invalid=7132, Unknown=0, NotChecked=0, Total=12210 [2023-04-01 08:41:40,848 INFO L87 Difference]: Start difference. First operand 129 states and 136 transitions. Second operand has 101 states, 101 states have (on average 1.1782178217821782) internal successors, (119), 101 states have internal predecessors, (119), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:41:40,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:41:40,976 INFO L93 Difference]: Finished difference Result 254 states and 317 transitions. [2023-04-01 08:41:40,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2023-04-01 08:41:40,976 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 1.1782178217821782) internal successors, (119), 101 states have internal predecessors, (119), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 125 [2023-04-01 08:41:40,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:41:40,977 INFO L225 Difference]: With dead ends: 254 [2023-04-01 08:41:40,977 INFO L226 Difference]: Without dead ends: 179 [2023-04-01 08:41:40,980 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 425 GetRequests, 316 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1677 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=5078, Invalid=7132, Unknown=0, NotChecked=0, Total=12210 [2023-04-01 08:41:40,980 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 190 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:41:40,980 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 67 Invalid, 190 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 189 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:41:40,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2023-04-01 08:41:40,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2023-04-01 08:41:40,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 173 states have (on average 1.046242774566474) internal successors, (181), 173 states have internal predecessors, (181), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 08:41:40,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 186 transitions. [2023-04-01 08:41:40,987 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 186 transitions. Word has length 125 [2023-04-01 08:41:40,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:41:40,987 INFO L495 AbstractCegarLoop]: Abstraction has 179 states and 186 transitions. [2023-04-01 08:41:40,987 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 1.1782178217821782) internal successors, (119), 101 states have internal predecessors, (119), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:41:40,987 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 186 transitions. [2023-04-01 08:41:40,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2023-04-01 08:41:40,989 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:41:40,989 INFO L195 NwaCegarLoop]: trace histogram [98, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:41:40,996 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-04-01 08:41:41,195 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:41:41,196 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:41:41,196 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:41:41,196 INFO L85 PathProgramCache]: Analyzing trace with hash -1185710546, now seen corresponding path program 8 times [2023-04-01 08:41:41,196 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:41:41,196 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [128588010] [2023-04-01 08:41:41,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:41:41,197 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:41:41,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:41:46,849 INFO L134 CoverageAnalysis]: Checked inductivity of 5181 backedges. 0 proven. 4851 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2023-04-01 08:41:46,850 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:41:46,850 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [128588010] [2023-04-01 08:41:46,850 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [128588010] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:41:46,850 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1756322127] [2023-04-01 08:41:46,850 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 08:41:46,850 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:41:46,850 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:41:46,851 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:41:46,852 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-04-01 08:41:55,798 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-04-01 08:41:55,798 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:41:55,811 INFO L262 TraceCheckSpWp]: Trace formula consists of 779 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-01 08:41:55,814 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:41:56,185 INFO L134 CoverageAnalysis]: Checked inductivity of 5181 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 5126 trivial. 0 not checked. [2023-04-01 08:41:56,185 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:41:56,642 INFO L134 CoverageAnalysis]: Checked inductivity of 5181 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 5126 trivial. 0 not checked. [2023-04-01 08:41:56,643 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1756322127] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:41:56,643 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1436825477] [2023-04-01 08:41:56,644 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:41:56,644 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:41:56,644 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:41:56,644 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:41:56,644 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:41:56,667 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 08:41:57,225 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 68 for LOIs [2023-04-01 08:41:57,243 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 08:41:57,245 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:41:58,483 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7255#(and (exists ((|v_old(#memory_int)_BEFORE_CALL_8| (Array Int (Array Int Int))) (|v_main_~#a7~0.base_BEFORE_CALL_8| Int) (|v_old(#valid)_BEFORE_CALL_8| (Array Int Int)) (|v_old(#length)_BEFORE_CALL_8| (Array Int Int)) (|v_main_~#a1~0.base_BEFORE_CALL_8| Int)) (and (not (= |v_old(#valid)_BEFORE_CALL_8| |v_old(#length)_BEFORE_CALL_8|)) (= (select |v_old(#length)_BEFORE_CALL_8| 2) 26) (not (= |v_main_~#a1~0.base_BEFORE_CALL_8| 0)) (not (= |v_main_~#a7~0.base_BEFORE_CALL_8| 0)) (not (= (select (select |#memory_int| |v_main_~#a7~0.base_BEFORE_CALL_8|) 0) (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_8|) 0))) (not (= |v_old(#length)_BEFORE_CALL_8| (select |v_old(#memory_int)_BEFORE_CALL_8| 1))) (= (select |v_old(#valid)_BEFORE_CALL_8| 1) 1) (not (= |v_main_~#a1~0.base_BEFORE_CALL_8| 1)) (= (select |v_old(#length)_BEFORE_CALL_8| 1) 2) (= (select |v_old(#valid)_BEFORE_CALL_8| 0) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_8| 1) 0) 48) (not (= 2 |v_main_~#a1~0.base_BEFORE_CALL_8|)) (not (= |v_old(#valid)_BEFORE_CALL_8| (select |v_old(#memory_int)_BEFORE_CALL_8| 1))) (= (select |v_old(#valid)_BEFORE_CALL_8| |v_main_~#a1~0.base_BEFORE_CALL_8|) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_8| 1) 1) 0) (not (= |#StackHeapBarrier| |v_main_~#a7~0.base_BEFORE_CALL_8|)) (not (= |#StackHeapBarrier| |v_main_~#a1~0.base_BEFORE_CALL_8|)) (= (select |v_old(#valid)_BEFORE_CALL_8| 2) 1))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:41:58,483 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:41:58,483 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:41:58,483 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 13, 13] total 123 [2023-04-01 08:41:58,483 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [394067270] [2023-04-01 08:41:58,483 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:41:58,484 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2023-04-01 08:41:58,484 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:41:58,485 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2023-04-01 08:41:58,488 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5353, Invalid=12203, Unknown=0, NotChecked=0, Total=17556 [2023-04-01 08:41:58,488 INFO L87 Difference]: Start difference. First operand 179 states and 186 transitions. Second operand has 123 states, 123 states have (on average 1.1951219512195121) internal successors, (147), 123 states have internal predecessors, (147), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:41:58,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:41:58,876 INFO L93 Difference]: Finished difference Result 327 states and 413 transitions. [2023-04-01 08:41:58,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2023-04-01 08:41:58,876 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 1.1951219512195121) internal successors, (147), 123 states have internal predecessors, (147), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 175 [2023-04-01 08:41:58,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:41:58,880 INFO L225 Difference]: With dead ends: 327 [2023-04-01 08:41:58,880 INFO L226 Difference]: Without dead ends: 252 [2023-04-01 08:41:58,884 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 625 GetRequests, 494 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3461 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=5353, Invalid=12203, Unknown=0, NotChecked=0, Total=17556 [2023-04-01 08:41:58,885 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 331 mSolverCounterSat, 291 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 622 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 291 IncrementalHoareTripleChecker+Valid, 331 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-01 08:41:58,886 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 128 Invalid, 622 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [291 Valid, 331 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-01 08:41:58,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2023-04-01 08:41:58,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 252. [2023-04-01 08:41:58,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 246 states have (on average 1.032520325203252) internal successors, (254), 246 states have internal predecessors, (254), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 08:41:58,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 259 transitions. [2023-04-01 08:41:58,895 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 259 transitions. Word has length 175 [2023-04-01 08:41:58,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:41:58,896 INFO L495 AbstractCegarLoop]: Abstraction has 252 states and 259 transitions. [2023-04-01 08:41:58,896 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 123 states have (on average 1.1951219512195121) internal successors, (147), 123 states have internal predecessors, (147), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:41:58,897 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 259 transitions. [2023-04-01 08:41:58,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 249 [2023-04-01 08:41:58,899 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:41:58,899 INFO L195 NwaCegarLoop]: trace histogram [99, 22, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:41:58,917 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-04-01 08:41:59,100 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-04-01 08:41:59,100 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:41:59,100 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:41:59,100 INFO L85 PathProgramCache]: Analyzing trace with hash -1542083115, now seen corresponding path program 9 times [2023-04-01 08:41:59,100 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:41:59,100 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1617486496] [2023-04-01 08:41:59,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:41:59,101 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:41:59,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:42:05,195 INFO L134 CoverageAnalysis]: Checked inductivity of 6468 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 1518 trivial. 0 not checked. [2023-04-01 08:42:05,195 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:42:05,195 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1617486496] [2023-04-01 08:42:05,195 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1617486496] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:42:05,196 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1536791803] [2023-04-01 08:42:05,196 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 08:42:05,196 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:42:05,196 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:42:05,197 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:42:05,197 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-04-01 08:42:05,890 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 08:42:05,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:42:05,901 INFO L262 TraceCheckSpWp]: Trace formula consists of 2796 conjuncts, 101 conjunts are in the unsatisfiable core [2023-04-01 08:42:05,907 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:42:06,024 INFO L134 CoverageAnalysis]: Checked inductivity of 6468 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 1518 trivial. 0 not checked. [2023-04-01 08:42:06,024 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:42:14,536 INFO L134 CoverageAnalysis]: Checked inductivity of 6468 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 1518 trivial. 0 not checked. [2023-04-01 08:42:14,536 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1536791803] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:42:14,536 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1941570887] [2023-04-01 08:42:14,538 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:42:14,538 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:42:14,538 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:42:14,538 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:42:14,538 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:42:14,560 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 08:42:15,097 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 68 for LOIs [2023-04-01 08:42:15,135 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 08:42:15,137 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:42:16,303 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10091#(and (exists ((|v_main_~#a7~0.base_BEFORE_CALL_9| Int) (|v_old(#valid)_BEFORE_CALL_9| (Array Int Int)) (|v_main_~#a1~0.base_BEFORE_CALL_9| Int) (|v_old(#length)_BEFORE_CALL_9| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_9| (Array Int (Array Int Int)))) (and (= (select |v_old(#valid)_BEFORE_CALL_9| 1) 1) (= (select (select |v_old(#memory_int)_BEFORE_CALL_9| 1) 1) 0) (not (= (select (select |#memory_int| |v_main_~#a7~0.base_BEFORE_CALL_9|) 0) (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_9|) 0))) (not (= |v_main_~#a7~0.base_BEFORE_CALL_9| 0)) (not (= |#StackHeapBarrier| |v_main_~#a7~0.base_BEFORE_CALL_9|)) (= (select |v_old(#valid)_BEFORE_CALL_9| 2) 1) (not (= |v_main_~#a1~0.base_BEFORE_CALL_9| 0)) (not (= |v_main_~#a1~0.base_BEFORE_CALL_9| 1)) (not (= |#StackHeapBarrier| |v_main_~#a1~0.base_BEFORE_CALL_9|)) (= (select |v_old(#valid)_BEFORE_CALL_9| 0) 0) (not (= 2 |v_main_~#a1~0.base_BEFORE_CALL_9|)) (not (= |v_old(#length)_BEFORE_CALL_9| (select |v_old(#memory_int)_BEFORE_CALL_9| 1))) (= 26 (select |v_old(#length)_BEFORE_CALL_9| 2)) (not (= |v_old(#valid)_BEFORE_CALL_9| (select |v_old(#memory_int)_BEFORE_CALL_9| 1))) (not (= |v_old(#valid)_BEFORE_CALL_9| |v_old(#length)_BEFORE_CALL_9|)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_9| 1) 0)) (= (select |v_old(#valid)_BEFORE_CALL_9| |v_main_~#a1~0.base_BEFORE_CALL_9|) 0) (= (select |v_old(#length)_BEFORE_CALL_9| 1) 2))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:42:16,303 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:42:16,303 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:42:16,303 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [102, 102, 102] total 203 [2023-04-01 08:42:16,303 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [930117742] [2023-04-01 08:42:16,303 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:42:16,304 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 203 states [2023-04-01 08:42:16,304 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:42:16,307 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 203 interpolants. [2023-04-01 08:42:16,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20531, Invalid=24625, Unknown=0, NotChecked=0, Total=45156 [2023-04-01 08:42:16,310 INFO L87 Difference]: Start difference. First operand 252 states and 259 transitions. Second operand has 203 states, 203 states have (on average 1.0886699507389161) internal successors, (221), 203 states have internal predecessors, (221), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:42:16,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:42:16,657 INFO L93 Difference]: Finished difference Result 500 states and 614 transitions. [2023-04-01 08:42:16,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 202 states. [2023-04-01 08:42:16,658 INFO L78 Accepts]: Start accepts. Automaton has has 203 states, 203 states have (on average 1.0886699507389161) internal successors, (221), 203 states have internal predecessors, (221), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 248 [2023-04-01 08:42:16,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:42:16,659 INFO L225 Difference]: With dead ends: 500 [2023-04-01 08:42:16,659 INFO L226 Difference]: Without dead ends: 353 [2023-04-01 08:42:16,662 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 845 GetRequests, 634 SyntacticMatches, 0 SemanticMatches, 211 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3411 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=20531, Invalid=24625, Unknown=0, NotChecked=0, Total=45156 [2023-04-01 08:42:16,662 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 382 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 383 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 382 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 08:42:16,662 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 133 Invalid, 383 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 382 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 08:42:16,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2023-04-01 08:42:16,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 353. [2023-04-01 08:42:16,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 353 states, 347 states have (on average 1.0230547550432276) internal successors, (355), 347 states have internal predecessors, (355), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 08:42:16,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 353 states to 353 states and 360 transitions. [2023-04-01 08:42:16,673 INFO L78 Accepts]: Start accepts. Automaton has 353 states and 360 transitions. Word has length 248 [2023-04-01 08:42:16,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:42:16,673 INFO L495 AbstractCegarLoop]: Abstraction has 353 states and 360 transitions. [2023-04-01 08:42:16,673 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 203 states, 203 states have (on average 1.0886699507389161) internal successors, (221), 203 states have internal predecessors, (221), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:42:16,674 INFO L276 IsEmpty]: Start isEmpty. Operand 353 states and 360 transitions. [2023-04-01 08:42:16,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 350 [2023-04-01 08:42:16,676 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:42:16,676 INFO L195 NwaCegarLoop]: trace histogram [200, 22, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:42:16,686 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-04-01 08:42:16,886 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:42:16,886 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:42:16,887 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:42:16,887 INFO L85 PathProgramCache]: Analyzing trace with hash -657263858, now seen corresponding path program 10 times [2023-04-01 08:42:16,887 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:42:16,887 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [228404130] [2023-04-01 08:42:16,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:42:16,887 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:42:17,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat