/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_vararg_ground.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 08:46:27,335 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 08:46:27,337 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 08:46:27,360 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 08:46:27,360 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 08:46:27,361 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 08:46:27,362 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 08:46:27,363 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 08:46:27,364 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 08:46:27,365 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 08:46:27,366 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 08:46:27,367 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 08:46:27,367 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 08:46:27,368 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 08:46:27,369 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 08:46:27,370 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 08:46:27,370 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 08:46:27,371 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 08:46:27,372 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 08:46:27,374 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 08:46:27,375 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 08:46:27,375 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 08:46:27,376 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 08:46:27,377 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 08:46:27,380 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 08:46:27,380 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 08:46:27,380 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 08:46:27,381 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 08:46:27,381 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 08:46:27,382 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 08:46:27,382 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 08:46:27,383 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 08:46:27,383 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 08:46:27,384 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 08:46:27,384 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 08:46:27,385 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 08:46:27,385 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 08:46:27,385 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 08:46:27,386 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 08:46:27,386 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 08:46:27,387 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 08:46:27,389 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 08:46:27,413 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 08:46:27,413 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 08:46:27,413 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 08:46:27,414 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 08:46:27,414 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 08:46:27,414 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 08:46:27,415 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 08:46:27,415 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 08:46:27,415 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 08:46:27,415 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 08:46:27,416 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 08:46:27,416 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 08:46:27,416 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 08:46:27,416 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 08:46:27,416 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 08:46:27,417 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 08:46:27,417 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 08:46:27,417 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 08:46:27,418 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 08:46:27,418 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 08:46:27,418 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 08:46:27,418 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 08:46:27,419 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 08:46:27,419 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 08:46:27,419 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 08:46:27,419 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 08:46:27,419 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 08:46:27,420 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 08:46:27,420 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 08:46:27,420 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 08:46:27,420 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 08:46:27,424 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 08:46:27,424 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 08:46:27,424 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 08:46:27,425 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 08:46:27,425 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 08:46:27,426 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 08:46:27,426 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 08:46:27,426 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 08:46:27,426 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 08:46:27,426 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 08:46:27,426 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> EqDomain [2023-04-01 08:46:27,632 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 08:46:27,651 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 08:46:27,653 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 08:46:27,655 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 08:46:27,655 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 08:46:27,656 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_vararg_ground.i [2023-04-01 08:46:28,860 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 08:46:29,035 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 08:46:29,035 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_vararg_ground.i [2023-04-01 08:46:29,040 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7d822677a/86cfa64c5fe5423d9e776a79261d1ac0/FLAGd61f55361 [2023-04-01 08:46:29,057 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7d822677a/86cfa64c5fe5423d9e776a79261d1ac0 [2023-04-01 08:46:29,059 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 08:46:29,060 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 08:46:29,062 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 08:46:29,062 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 08:46:29,065 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 08:46:29,065 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 08:46:29" (1/1) ... [2023-04-01 08:46:29,066 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@354aefa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:46:29, skipping insertion in model container [2023-04-01 08:46:29,066 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 08:46:29" (1/1) ... [2023-04-01 08:46:29,073 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 08:46:29,086 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 08:46:29,205 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_vararg_ground.i[815,828] [2023-04-01 08:46:29,221 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 08:46:29,231 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 08:46:29,243 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_vararg_ground.i[815,828] [2023-04-01 08:46:29,251 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 08:46:29,264 INFO L208 MainTranslator]: Completed translation [2023-04-01 08:46:29,264 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:46:29 WrapperNode [2023-04-01 08:46:29,264 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 08:46:29,266 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 08:46:29,266 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 08:46:29,266 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 08:46:29,275 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:46:29" (1/1) ... [2023-04-01 08:46:29,276 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:46:29" (1/1) ... [2023-04-01 08:46:29,281 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:46:29" (1/1) ... [2023-04-01 08:46:29,282 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:46:29" (1/1) ... [2023-04-01 08:46:29,287 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:46:29" (1/1) ... [2023-04-01 08:46:29,291 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:46:29" (1/1) ... [2023-04-01 08:46:29,292 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:46:29" (1/1) ... [2023-04-01 08:46:29,293 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:46:29" (1/1) ... [2023-04-01 08:46:29,295 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 08:46:29,296 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 08:46:29,296 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 08:46:29,296 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 08:46:29,301 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:46:29" (1/1) ... [2023-04-01 08:46:29,308 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 08:46:29,317 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:46:29,330 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 08:46:29,335 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 08:46:29,378 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 08:46:29,378 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 08:46:29,378 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 08:46:29,379 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-01 08:46:29,379 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 08:46:29,379 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 08:46:29,379 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 08:46:29,379 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-04-01 08:46:29,379 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-04-01 08:46:29,379 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 08:46:29,379 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 08:46:29,380 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 08:46:29,380 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 08:46:29,380 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 08:46:29,380 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-01 08:46:29,380 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 08:46:29,380 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 08:46:29,380 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 08:46:29,380 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 08:46:29,380 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 08:46:29,380 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 08:46:29,456 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 08:46:29,458 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 08:46:29,560 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 08:46:29,585 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 08:46:29,585 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-04-01 08:46:29,588 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 08:46:29 BoogieIcfgContainer [2023-04-01 08:46:29,588 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 08:46:29,590 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 08:46:29,590 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 08:46:29,592 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 08:46:29,593 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 08:46:29" (1/3) ... [2023-04-01 08:46:29,593 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@345373f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 08:46:29, skipping insertion in model container [2023-04-01 08:46:29,594 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:46:29" (2/3) ... [2023-04-01 08:46:29,594 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@345373f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 08:46:29, skipping insertion in model container [2023-04-01 08:46:29,594 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 08:46:29" (3/3) ... [2023-04-01 08:46:29,595 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_vararg_ground.i [2023-04-01 08:46:29,607 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 08:46:29,607 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 08:46:29,645 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 08:46:29,651 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;@2c750201, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 08:46:29,652 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 08:46:29,655 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 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 08:46:29,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-04-01 08:46:29,661 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:46:29,662 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:46:29,662 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:46:29,667 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:46:29,667 INFO L85 PathProgramCache]: Analyzing trace with hash 2038647307, now seen corresponding path program 1 times [2023-04-01 08:46:29,675 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:46:29,675 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1953042411] [2023-04-01 08:46:29,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:46:29,676 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:46:29,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:29,843 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 08:46:29,843 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:46:29,844 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1953042411] [2023-04-01 08:46:29,845 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1953042411] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 08:46:29,845 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 08:46:29,846 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-04-01 08:46:29,847 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567832658] [2023-04-01 08:46:29,848 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 08:46:29,851 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-04-01 08:46:29,852 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:46:29,884 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-04-01 08:46:29,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-04-01 08:46:29,887 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 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 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:46:29,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:46:29,916 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2023-04-01 08:46:29,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-04-01 08:46:29,918 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2023-04-01 08:46:29,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:46:29,923 INFO L225 Difference]: With dead ends: 34 [2023-04-01 08:46:29,923 INFO L226 Difference]: Without dead ends: 18 [2023-04-01 08:46:29,926 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-04-01 08:46:29,928 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 08:46:29,929 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 18 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 08:46:29,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-04-01 08:46:29,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2023-04-01 08:46:29,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 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 08:46:29,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2023-04-01 08:46:29,957 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2023-04-01 08:46:29,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:46:29,957 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2023-04-01 08:46:29,957 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:46:29,958 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2023-04-01 08:46:29,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-04-01 08:46:29,958 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:46:29,958 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:46:29,958 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 08:46:29,959 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:46:29,959 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:46:29,959 INFO L85 PathProgramCache]: Analyzing trace with hash -1823988107, now seen corresponding path program 1 times [2023-04-01 08:46:29,960 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:46:29,960 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1407690333] [2023-04-01 08:46:29,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:46:29,960 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:46:29,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:30,028 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 08:46:30,029 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:46:30,029 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1407690333] [2023-04-01 08:46:30,029 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1407690333] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 08:46:30,029 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 08:46:30,029 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 08:46:30,029 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618842047] [2023-04-01 08:46:30,029 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 08:46:30,030 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 08:46:30,030 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:46:30,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 08:46:30,031 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 08:46:30,031 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 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 08:46:30,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:46:30,059 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2023-04-01 08:46:30,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 08:46:30,059 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 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 14 [2023-04-01 08:46:30,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:46:30,060 INFO L225 Difference]: With dead ends: 31 [2023-04-01 08:46:30,060 INFO L226 Difference]: Without dead ends: 19 [2023-04-01 08:46:30,061 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 08:46:30,062 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 08:46:30,062 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 31 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 08:46:30,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-04-01 08:46:30,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-04-01 08:46:30,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 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 08:46:30,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2023-04-01 08:46:30,067 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 14 [2023-04-01 08:46:30,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:46:30,067 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2023-04-01 08:46:30,068 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 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 08:46:30,068 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2023-04-01 08:46:30,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-04-01 08:46:30,068 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:46:30,068 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:46:30,069 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-01 08:46:30,069 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:46:30,069 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:46:30,069 INFO L85 PathProgramCache]: Analyzing trace with hash -1691903162, now seen corresponding path program 1 times [2023-04-01 08:46:30,070 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:46:30,070 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [876556822] [2023-04-01 08:46:30,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:46:30,070 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:46:30,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:30,221 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:46:30,221 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:46:30,221 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [876556822] [2023-04-01 08:46:30,222 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [876556822] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:46:30,222 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1654305640] [2023-04-01 08:46:30,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:46:30,222 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:46:30,222 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:46:30,238 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 08:46:30,257 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 08:46:30,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:30,322 INFO L262 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-01 08:46:30,327 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:46:30,368 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:46:30,368 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:46:30,401 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:46:30,402 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1654305640] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:46:30,402 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [957309388] [2023-04-01 08:46:30,441 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-04-01 08:46:30,441 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:46:30,444 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:46:30,449 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:46:30,449 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:46:30,672 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 08:46:30,981 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 08:46:30,990 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:46:31,664 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [957309388] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 08:46:31,664 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:46:31,664 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [4, 4, 4] total 16 [2023-04-01 08:46:31,665 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573718828] [2023-04-01 08:46:31,665 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 08:46:31,666 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-04-01 08:46:31,667 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:46:31,668 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-04-01 08:46:31,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2023-04-01 08:46:31,670 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 11 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:46:32,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:46:32,547 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2023-04-01 08:46:32,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-01 08:46:32,548 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2023-04-01 08:46:32,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:46:32,548 INFO L225 Difference]: With dead ends: 32 [2023-04-01 08:46:32,549 INFO L226 Difference]: Without dead ends: 21 [2023-04-01 08:46:32,549 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=118, Invalid=434, Unknown=0, NotChecked=0, Total=552 [2023-04-01 08:46:32,550 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 40 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:46:32,551 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 5 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:46:32,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-04-01 08:46:32,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-04-01 08:46:32,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 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 08:46:32,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2023-04-01 08:46:32,559 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 15 [2023-04-01 08:46:32,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:46:32,559 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2023-04-01 08:46:32,559 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:46:32,559 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2023-04-01 08:46:32,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-04-01 08:46:32,560 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:46:32,560 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:46:32,569 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 08:46:32,765 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 08:46:32,766 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:46:32,766 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:46:32,766 INFO L85 PathProgramCache]: Analyzing trace with hash -773824437, now seen corresponding path program 1 times [2023-04-01 08:46:32,766 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:46:32,766 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1099013690] [2023-04-01 08:46:32,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:46:32,767 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:46:32,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:32,849 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 08:46:32,850 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:46:32,850 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1099013690] [2023-04-01 08:46:32,850 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1099013690] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:46:32,853 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1002881619] [2023-04-01 08:46:32,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:46:32,853 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:46:32,853 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:46:32,857 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 08:46:32,861 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 08:46:32,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:32,907 INFO L262 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-01 08:46:32,909 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:46:32,919 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 08:46:32,920 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:46:32,940 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 08:46:32,940 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1002881619] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:46:32,943 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1781838777] [2023-04-01 08:46:32,945 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-04-01 08:46:32,945 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:46:32,945 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:46:32,945 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:46:32,946 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:46:33,000 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 08:46:33,333 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 67 for LOIs [2023-04-01 08:46:33,380 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 08:46:33,383 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:46:34,105 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '480#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (exists ((|v_main_~#aa~0.base_BEFORE_CALL_1| Int) (|v_old(#length)_BEFORE_CALL_1| (Array Int Int)) (v_main_~a~0_BEFORE_CALL_1 Int) (|v_old(#memory_int)_BEFORE_CALL_1| (Array Int (Array Int 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 (= |v_main_~#aa~0.base_BEFORE_CALL_1| 1)) (not (= |v_main_~#aa~0.base_BEFORE_CALL_1| 0)) (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) (= (select |v_old(#length)_BEFORE_CALL_1| 2) 25) (= 2 (select |v_old(#length)_BEFORE_CALL_1| 1)) (= (select |v_old(#valid)_BEFORE_CALL_1| |v_main_~#aa~0.base_BEFORE_CALL_1|) 0) (= (select |v_old(#valid)_BEFORE_CALL_1| 2) 1) (not (= |#StackHeapBarrier| |v_main_~#aa~0.base_BEFORE_CALL_1|)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_1| 1) |v_old(#length)_BEFORE_CALL_1|)) (not (= 2 |v_main_~#aa~0.base_BEFORE_CALL_1|)) (< (select (select |#memory_int| |v_main_~#aa~0.base_BEFORE_CALL_1|) 0) 0) (= (select |v_old(#valid)_BEFORE_CALL_1| 0) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_1| 1) 1) 0) (< 0 v_main_~a~0_BEFORE_CALL_1) (< (select (select |#memory_int| |v_main_~#aa~0.base_BEFORE_CALL_1|) (* v_main_~a~0_BEFORE_CALL_1 4)) 0))) (= |#NULL.base| 0))' at error location [2023-04-01 08:46:34,106 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:46:34,106 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:46:34,106 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-01 08:46:34,106 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534490716] [2023-04-01 08:46:34,106 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:46:34,107 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-01 08:46:34,107 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:46:34,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-01 08:46:34,108 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=320, Unknown=0, NotChecked=0, Total=380 [2023-04-01 08:46:34,108 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 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 08:46:34,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:46:34,136 INFO L93 Difference]: Finished difference Result 38 states and 44 transitions. [2023-04-01 08:46:34,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-01 08:46:34,138 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 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 08:46:34,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:46:34,148 INFO L225 Difference]: With dead ends: 38 [2023-04-01 08:46:34,148 INFO L226 Difference]: Without dead ends: 24 [2023-04-01 08:46:34,148 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=60, Invalid=320, Unknown=0, NotChecked=0, Total=380 [2023-04-01 08:46:34,153 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 08:46:34,154 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 31 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 08:46:34,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-04-01 08:46:34,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-04-01 08:46:34,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 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 08:46:34,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2023-04-01 08:46:34,163 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2023-04-01 08:46:34,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:46:34,163 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2023-04-01 08:46:34,163 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 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 08:46:34,163 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2023-04-01 08:46:34,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-04-01 08:46:34,164 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:46:34,164 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:46:34,176 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 08:46:34,370 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 08:46:34,370 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:46:34,371 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:46:34,371 INFO L85 PathProgramCache]: Analyzing trace with hash -812648454, now seen corresponding path program 2 times [2023-04-01 08:46:34,371 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:46:34,371 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1124801631] [2023-04-01 08:46:34,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:46:34,371 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:46:34,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:34,502 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 08:46:34,503 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:46:34,503 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1124801631] [2023-04-01 08:46:34,503 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1124801631] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:46:34,503 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1189209302] [2023-04-01 08:46:34,503 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 08:46:34,503 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:46:34,503 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:46:34,504 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 08:46:34,507 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 08:46:34,559 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-01 08:46:34,560 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:46:34,561 INFO L262 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 15 conjunts are in the unsatisfiable core [2023-04-01 08:46:34,565 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:46:34,672 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2023-04-01 08:46:34,700 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 08:46:34,700 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:46:34,784 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2023-04-01 08:46:34,785 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 12 [2023-04-01 08:46:34,806 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 08:46:34,806 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1189209302] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:46:34,806 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [211079375] [2023-04-01 08:46:34,808 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-04-01 08:46:34,808 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:46:34,809 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:46:34,809 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:46:34,809 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:46:34,841 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 08:46:35,077 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 67 for LOIs [2023-04-01 08:46:35,112 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 08:46:35,115 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:46:35,972 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '725#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (exists ((|v_main_~#aa~0.base_BEFORE_CALL_2| Int) (v_main_~a~0_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)))) (and (= 2 (select |v_old(#length)_BEFORE_CALL_2| 1)) (not (= 2 |v_main_~#aa~0.base_BEFORE_CALL_2|)) (< 0 v_main_~a~0_BEFORE_CALL_2) (= (select (select |v_old(#memory_int)_BEFORE_CALL_2| 1) 1) 0) (= (select |v_old(#length)_BEFORE_CALL_2| 2) 25) (= (select |v_old(#valid)_BEFORE_CALL_2| 0) 0) (not (= |v_main_~#aa~0.base_BEFORE_CALL_2| 1)) (= (select |v_old(#valid)_BEFORE_CALL_2| |v_main_~#aa~0.base_BEFORE_CALL_2|) 0) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_2| 1) 0)) (not (= |v_old(#length)_BEFORE_CALL_2| (select |v_old(#memory_int)_BEFORE_CALL_2| 1))) (not (= |#StackHeapBarrier| |v_main_~#aa~0.base_BEFORE_CALL_2|)) (< (select (select |#memory_int| |v_main_~#aa~0.base_BEFORE_CALL_2|) (* v_main_~a~0_BEFORE_CALL_2 4)) 0) (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_~#aa~0.base_BEFORE_CALL_2| 0)) (< (select (select |#memory_int| |v_main_~#aa~0.base_BEFORE_CALL_2|) 0) 0) (= (select |v_old(#valid)_BEFORE_CALL_2| 1) 1))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:46:35,973 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:46:35,973 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:46:35,973 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 9] total 20 [2023-04-01 08:46:35,973 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428277337] [2023-04-01 08:46:35,973 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:46:35,973 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-04-01 08:46:35,974 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:46:35,974 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-04-01 08:46:35,975 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=957, Unknown=0, NotChecked=0, Total=1056 [2023-04-01 08:46:35,975 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 20 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 18 states have internal predecessors, (37), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:46:36,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:46:36,221 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2023-04-01 08:46:36,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-04-01 08:46:36,222 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 18 states have internal predecessors, (37), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2023-04-01 08:46:36,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:46:36,222 INFO L225 Difference]: With dead ends: 46 [2023-04-01 08:46:36,222 INFO L226 Difference]: Without dead ends: 32 [2023-04-01 08:46:36,223 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 342 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=164, Invalid=1476, Unknown=0, NotChecked=0, Total=1640 [2023-04-01 08:46:36,224 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 16 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:46:36,224 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 112 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 151 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:46:36,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-04-01 08:46:36,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2023-04-01 08:46:36,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 24 states have internal predecessors, (26), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 08:46:36,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2023-04-01 08:46:36,234 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 20 [2023-04-01 08:46:36,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:46:36,234 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2023-04-01 08:46:36,234 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 18 states have internal predecessors, (37), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:46:36,235 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2023-04-01 08:46:36,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-04-01 08:46:36,235 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:46:36,235 INFO L195 NwaCegarLoop]: trace histogram [5, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:46:36,247 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-01 08:46:36,442 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 08:46:36,443 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:46:36,443 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:46:36,443 INFO L85 PathProgramCache]: Analyzing trace with hash 1854357936, now seen corresponding path program 1 times [2023-04-01 08:46:36,443 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:46:36,443 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [22797467] [2023-04-01 08:46:36,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:46:36,443 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:46:36,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:36,557 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 08:46:36,557 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:46:36,557 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [22797467] [2023-04-01 08:46:36,557 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [22797467] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:46:36,557 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [608326870] [2023-04-01 08:46:36,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:46:36,557 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:46:36,558 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:46:36,559 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 08:46:36,583 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 08:46:36,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:36,626 INFO L262 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 7 conjunts are in the unsatisfiable core [2023-04-01 08:46:36,628 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:46:36,641 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 08:46:36,642 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:46:36,720 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 08:46:36,720 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [608326870] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:46:36,720 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1254372736] [2023-04-01 08:46:36,721 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:46:36,721 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:46:36,722 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:46:36,722 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:46:36,722 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:46:36,750 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 08:46:37,255 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2023-04-01 08:46:37,313 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 08:46:37,316 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:46:38,281 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1052#(and (exists ((|v_old(#memory_int)_BEFORE_CALL_11| (Array Int (Array Int Int))) (|v_main_~#aa~0.base_BEFORE_CALL_11| Int) (|v_old(#valid)_BEFORE_CALL_11| (Array Int Int)) (|v_old(#length)_BEFORE_CALL_11| (Array Int Int)) (v_main_~a~0_BEFORE_CALL_11 Int)) (and (= 25 (select |v_old(#length)_BEFORE_CALL_11| 2)) (not (= |v_main_~#aa~0.base_BEFORE_CALL_11| 1)) (not (= |v_old(#valid)_BEFORE_CALL_11| (select |v_old(#memory_int)_BEFORE_CALL_11| 1))) (not (= (select (select |#memory_int| |v_main_~#aa~0.base_BEFORE_CALL_11|) (* v_main_~a~0_BEFORE_CALL_11 4)) 0)) (not (= |v_main_~#aa~0.base_BEFORE_CALL_11| |#StackHeapBarrier|)) (= 1 (select |v_old(#valid)_BEFORE_CALL_11| 2)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_11| 1) 1) 0) (not (= |v_old(#length)_BEFORE_CALL_11| (select |v_old(#memory_int)_BEFORE_CALL_11| 1))) (not (= |v_main_~#aa~0.base_BEFORE_CALL_11| 2)) (= (select |v_old(#valid)_BEFORE_CALL_11| |v_main_~#aa~0.base_BEFORE_CALL_11|) 0) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_11| 1) 0)) (= (select |v_old(#valid)_BEFORE_CALL_11| 1) 1) (not (= |v_main_~#aa~0.base_BEFORE_CALL_11| 0)) (= (select |v_old(#length)_BEFORE_CALL_11| 1) 2) (not (= |v_old(#valid)_BEFORE_CALL_11| |v_old(#length)_BEFORE_CALL_11|)) (= (select |v_old(#valid)_BEFORE_CALL_11| 0) 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 08:46:38,281 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:46:38,281 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:46:38,282 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2023-04-01 08:46:38,282 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [224745129] [2023-04-01 08:46:38,282 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:46:38,282 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-04-01 08:46:38,282 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:46:38,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-04-01 08:46:38,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=667, Unknown=0, NotChecked=0, Total=812 [2023-04-01 08:46:38,284 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand has 15 states, 15 states have (on average 2.066666666666667) internal successors, (31), 15 states have internal predecessors, (31), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-04-01 08:46:38,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:46:38,320 INFO L93 Difference]: Finished difference Result 58 states and 68 transitions. [2023-04-01 08:46:38,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-01 08:46:38,321 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.066666666666667) internal successors, (31), 15 states have internal predecessors, (31), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 28 [2023-04-01 08:46:38,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:46:38,326 INFO L225 Difference]: With dead ends: 58 [2023-04-01 08:46:38,326 INFO L226 Difference]: Without dead ends: 38 [2023-04-01 08:46:38,326 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 312 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=145, Invalid=667, Unknown=0, NotChecked=0, Total=812 [2023-04-01 08:46:38,328 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 08:46:38,328 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 76 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 08:46:38,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-04-01 08:46:38,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2023-04-01 08:46:38,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 30 states have (on average 1.1) internal successors, (33), 31 states have internal predecessors, (33), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 08:46:38,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2023-04-01 08:46:38,346 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 28 [2023-04-01 08:46:38,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:46:38,347 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2023-04-01 08:46:38,347 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.066666666666667) internal successors, (31), 15 states have internal predecessors, (31), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-04-01 08:46:38,347 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2023-04-01 08:46:38,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-04-01 08:46:38,348 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:46:38,348 INFO L195 NwaCegarLoop]: trace histogram [12, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:46:38,356 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 08:46:38,554 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 08:46:38,554 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:46:38,554 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:46:38,554 INFO L85 PathProgramCache]: Analyzing trace with hash 453653089, now seen corresponding path program 2 times [2023-04-01 08:46:38,554 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:46:38,554 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1671851187] [2023-04-01 08:46:38,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:46:38,555 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:46:38,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:38,817 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 2 proven. 78 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 08:46:38,817 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:46:38,817 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1671851187] [2023-04-01 08:46:38,817 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1671851187] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:46:38,818 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [202327171] [2023-04-01 08:46:38,818 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 08:46:38,818 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:46:38,818 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:46:38,819 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 08:46:38,822 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 08:46:38,879 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-01 08:46:38,879 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:46:38,880 INFO L262 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 5 conjunts are in the unsatisfiable core [2023-04-01 08:46:38,881 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:46:38,961 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2023-04-01 08:46:38,961 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:46:39,034 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2023-04-01 08:46:39,034 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [202327171] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:46:39,034 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [998415973] [2023-04-01 08:46:39,035 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:46:39,035 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:46:39,036 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:46:39,036 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:46:39,036 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:46:39,064 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 08:46:39,558 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2023-04-01 08:46:39,599 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 08:46:39,601 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:46:40,471 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1448#(and (exists ((|v_old(#valid)_BEFORE_CALL_20| (Array Int Int)) (|v_main_~#aa~0.base_BEFORE_CALL_20| Int) (v_main_~a~0_BEFORE_CALL_22 Int) (|v_old(#length)_BEFORE_CALL_20| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_20| (Array Int (Array Int Int)))) (and (not (= |v_main_~#aa~0.base_BEFORE_CALL_20| 0)) (not (= |v_old(#valid)_BEFORE_CALL_20| |v_old(#length)_BEFORE_CALL_20|)) (not (= |v_main_~#aa~0.base_BEFORE_CALL_20| 2)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_20| 1) 1) 0) (not (= (select |v_old(#memory_int)_BEFORE_CALL_20| 1) |v_old(#length)_BEFORE_CALL_20|)) (= (select |v_old(#valid)_BEFORE_CALL_20| 0) 0) (not (= (select (select |#memory_int| |v_main_~#aa~0.base_BEFORE_CALL_20|) (* v_main_~a~0_BEFORE_CALL_22 4)) 0)) (not (= |v_main_~#aa~0.base_BEFORE_CALL_20| |#StackHeapBarrier|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_20| 1) 0) 48) (= (select |v_old(#valid)_BEFORE_CALL_20| 2) 1) (not (= |v_old(#valid)_BEFORE_CALL_20| (select |v_old(#memory_int)_BEFORE_CALL_20| 1))) (= (select |v_old(#length)_BEFORE_CALL_20| 2) 25) (= (select |v_old(#valid)_BEFORE_CALL_20| |v_main_~#aa~0.base_BEFORE_CALL_20|) 0) (not (= |v_main_~#aa~0.base_BEFORE_CALL_20| 1)) (= 2 (select |v_old(#length)_BEFORE_CALL_20| 1)) (= (select |v_old(#valid)_BEFORE_CALL_20| 1) 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 08:46:40,472 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:46:40,472 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:46:40,472 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 6, 6] total 21 [2023-04-01 08:46:40,472 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610933562] [2023-04-01 08:46:40,472 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:46:40,473 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-04-01 08:46:40,473 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:46:40,474 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-04-01 08:46:40,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=1023, Unknown=0, NotChecked=0, Total=1190 [2023-04-01 08:46:40,474 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand has 21 states, 21 states have (on average 2.0) internal successors, (42), 21 states have internal predecessors, (42), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 08:46:40,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:46:40,737 INFO L93 Difference]: Finished difference Result 66 states and 72 transitions. [2023-04-01 08:46:40,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-04-01 08:46:40,738 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.0) internal successors, (42), 21 states have internal predecessors, (42), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 35 [2023-04-01 08:46:40,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:46:40,738 INFO L225 Difference]: With dead ends: 66 [2023-04-01 08:46:40,739 INFO L226 Difference]: Without dead ends: 41 [2023-04-01 08:46:40,740 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 84 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 576 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=388, Invalid=1868, Unknown=0, NotChecked=0, Total=2256 [2023-04-01 08:46:40,740 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 0 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:46:40,740 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 107 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:46:40,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-04-01 08:46:40,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2023-04-01 08:46:40,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 34 states have internal predecessors, (36), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 08:46:40,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2023-04-01 08:46:40,754 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 35 [2023-04-01 08:46:40,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:46:40,754 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2023-04-01 08:46:40,754 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.0) internal successors, (42), 21 states have internal predecessors, (42), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 08:46:40,754 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2023-04-01 08:46:40,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-04-01 08:46:40,755 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:46:40,755 INFO L195 NwaCegarLoop]: trace histogram [13, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:46:40,767 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 08:46:40,961 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 08:46:40,961 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:46:40,962 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:46:40,962 INFO L85 PathProgramCache]: Analyzing trace with hash 1230142155, now seen corresponding path program 3 times [2023-04-01 08:46:40,962 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:46:40,962 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [207214087] [2023-04-01 08:46:40,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:46:40,962 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:46:40,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:41,172 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 2 proven. 91 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-01 08:46:41,173 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:46:41,173 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [207214087] [2023-04-01 08:46:41,173 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [207214087] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:46:41,173 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [948961198] [2023-04-01 08:46:41,173 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 08:46:41,173 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:46:41,174 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:46:41,175 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 08:46:41,177 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 08:46:41,250 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 08:46:41,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:46:41,252 INFO L262 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 15 conjunts are in the unsatisfiable core [2023-04-01 08:46:41,255 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:46:41,280 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 08:46:41,280 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:46:41,551 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 2 proven. 91 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-01 08:46:41,552 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [948961198] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:46:41,552 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1500539278] [2023-04-01 08:46:41,553 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:46:41,553 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:46:41,554 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:46:41,554 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:46:41,554 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:46:41,575 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 08:46:41,982 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2023-04-01 08:46:42,012 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 08:46:42,015 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:46:42,805 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1916#(and (exists ((|v_old(#length)_BEFORE_CALL_29| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_29| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_29| (Array Int Int)) (|v_main_~#aa~0.base_BEFORE_CALL_29| Int) (v_main_~a~0_BEFORE_CALL_31 Int)) (and (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_29| 1) 0)) (not (= |v_main_~#aa~0.base_BEFORE_CALL_29| 2)) (= (select |v_old(#valid)_BEFORE_CALL_29| 1) 1) (not (= |v_old(#valid)_BEFORE_CALL_29| |v_old(#length)_BEFORE_CALL_29|)) (= (select |v_old(#length)_BEFORE_CALL_29| 2) 25) (not (= |v_main_~#aa~0.base_BEFORE_CALL_29| 0)) (not (= |v_main_~#aa~0.base_BEFORE_CALL_29| |#StackHeapBarrier|)) (= (select |v_old(#valid)_BEFORE_CALL_29| 2) 1) (= (select (select |v_old(#memory_int)_BEFORE_CALL_29| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_29| 0) 0) (not (= (select (select |#memory_int| |v_main_~#aa~0.base_BEFORE_CALL_29|) (* v_main_~a~0_BEFORE_CALL_31 4)) 0)) (not (= |v_old(#valid)_BEFORE_CALL_29| (select |v_old(#memory_int)_BEFORE_CALL_29| 1))) (= 2 (select |v_old(#length)_BEFORE_CALL_29| 1)) (= (select |v_old(#valid)_BEFORE_CALL_29| |v_main_~#aa~0.base_BEFORE_CALL_29|) 0) (not (= |v_main_~#aa~0.base_BEFORE_CALL_29| 1)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_29| 1) |v_old(#length)_BEFORE_CALL_29|)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:46:42,805 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:46:42,805 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:46:42,806 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2023-04-01 08:46:42,806 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1207990280] [2023-04-01 08:46:42,806 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:46:42,806 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2023-04-01 08:46:42,806 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:46:42,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2023-04-01 08:46:42,808 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=505, Invalid=1475, Unknown=0, NotChecked=0, Total=1980 [2023-04-01 08:46:42,808 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 31 states, 31 states have (on average 1.5161290322580645) internal successors, (47), 31 states have internal predecessors, (47), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-04-01 08:46:42,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:46:42,860 INFO L93 Difference]: Finished difference Result 78 states and 96 transitions. [2023-04-01 08:46:42,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2023-04-01 08:46:42,862 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.5161290322580645) internal successors, (47), 31 states have internal predecessors, (47), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 38 [2023-04-01 08:46:42,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:46:42,863 INFO L225 Difference]: With dead ends: 78 [2023-04-01 08:46:42,863 INFO L226 Difference]: Without dead ends: 56 [2023-04-01 08:46:42,864 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 680 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=505, Invalid=1475, Unknown=0, NotChecked=0, Total=1980 [2023-04-01 08:46:42,864 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 08:46:42,864 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 46 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 08:46:42,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2023-04-01 08:46:42,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2023-04-01 08:46:42,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 48 states have (on average 1.0625) internal successors, (51), 49 states have internal predecessors, (51), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 08:46:42,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2023-04-01 08:46:42,879 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 38 [2023-04-01 08:46:42,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:46:42,879 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2023-04-01 08:46:42,880 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.5161290322580645) internal successors, (47), 31 states have internal predecessors, (47), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-04-01 08:46:42,880 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2023-04-01 08:46:42,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2023-04-01 08:46:42,881 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:46:42,881 INFO L195 NwaCegarLoop]: trace histogram [28, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:46:42,891 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-04-01 08:46:43,091 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 08:46:43,092 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:46:43,092 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:46:43,092 INFO L85 PathProgramCache]: Analyzing trace with hash 471054780, now seen corresponding path program 4 times [2023-04-01 08:46:43,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:46:43,092 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [301691197] [2023-04-01 08:46:43,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:46:43,093 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:46:43,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:43,740 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 2 proven. 406 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-01 08:46:43,740 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:46:43,740 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [301691197] [2023-04-01 08:46:43,740 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [301691197] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:46:43,740 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [920916419] [2023-04-01 08:46:43,741 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 08:46:43,741 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:46:43,741 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:46:43,744 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 08:46:43,745 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 08:46:43,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:43,853 INFO L262 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 30 conjunts are in the unsatisfiable core [2023-04-01 08:46:43,855 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:46:43,907 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 08:46:43,907 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:46:44,873 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 2 proven. 406 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-01 08:46:44,873 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [920916419] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:46:44,873 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [64031901] [2023-04-01 08:46:44,876 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:46:44,876 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:46:44,876 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:46:44,876 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:46:44,876 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:46:44,899 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 08:46:45,285 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2023-04-01 08:46:45,316 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 08:46:45,319 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:46:46,272 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2533#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (exists ((|v_old(#length)_BEFORE_CALL_38| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_38| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_38| (Array Int Int)) (v_main_~a~0_BEFORE_CALL_40 Int) (|v_main_~#aa~0.base_BEFORE_CALL_38| Int)) (and (= (select |v_old(#valid)_BEFORE_CALL_38| 2) 1) (not (= |v_main_~#aa~0.base_BEFORE_CALL_38| |#StackHeapBarrier|)) (= (select |v_old(#valid)_BEFORE_CALL_38| 1) 1) (not (= |v_main_~#aa~0.base_BEFORE_CALL_38| 1)) (not (= |v_old(#valid)_BEFORE_CALL_38| (select |v_old(#memory_int)_BEFORE_CALL_38| 1))) (= (select (select |v_old(#memory_int)_BEFORE_CALL_38| 1) 0) 48) (not (= |v_main_~#aa~0.base_BEFORE_CALL_38| 0)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_38| 1) |v_old(#length)_BEFORE_CALL_38|)) (not (= (select (select |#memory_int| |v_main_~#aa~0.base_BEFORE_CALL_38|) (* v_main_~a~0_BEFORE_CALL_40 4)) 0)) (= (select |v_old(#valid)_BEFORE_CALL_38| 0) 0) (= (select |v_old(#valid)_BEFORE_CALL_38| |v_main_~#aa~0.base_BEFORE_CALL_38|) 0) (= (select |v_old(#length)_BEFORE_CALL_38| 2) 25) (not (= |v_old(#valid)_BEFORE_CALL_38| |v_old(#length)_BEFORE_CALL_38|)) (not (= |v_main_~#aa~0.base_BEFORE_CALL_38| 2)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_38| 1) 1) 0) (= 2 (select |v_old(#length)_BEFORE_CALL_38| 1)))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:46:46,273 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:46:46,273 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:46:46,273 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 61 [2023-04-01 08:46:46,273 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [770888290] [2023-04-01 08:46:46,273 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:46:46,274 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2023-04-01 08:46:46,274 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:46:46,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2023-04-01 08:46:46,277 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1870, Invalid=3680, Unknown=0, NotChecked=0, Total=5550 [2023-04-01 08:46:46,277 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand has 61 states, 61 states have (on average 1.2622950819672132) internal successors, (77), 61 states have internal predecessors, (77), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-04-01 08:46:46,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:46:46,361 INFO L93 Difference]: Finished difference Result 108 states and 141 transitions. [2023-04-01 08:46:46,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2023-04-01 08:46:46,362 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 1.2622950819672132) internal successors, (77), 61 states have internal predecessors, (77), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 53 [2023-04-01 08:46:46,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:46:46,363 INFO L225 Difference]: With dead ends: 108 [2023-04-01 08:46:46,363 INFO L226 Difference]: Without dead ends: 86 [2023-04-01 08:46:46,364 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1370 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1870, Invalid=3680, Unknown=0, NotChecked=0, Total=5550 [2023-04-01 08:46:46,365 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 08:46:46,365 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 91 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 08:46:46,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2023-04-01 08:46:46,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2023-04-01 08:46:46,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 78 states have (on average 1.0384615384615385) internal successors, (81), 79 states have internal predecessors, (81), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 08:46:46,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2023-04-01 08:46:46,397 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 53 [2023-04-01 08:46:46,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:46:46,398 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2023-04-01 08:46:46,398 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 1.2622950819672132) internal successors, (77), 61 states have internal predecessors, (77), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-04-01 08:46:46,398 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2023-04-01 08:46:46,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2023-04-01 08:46:46,403 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:46:46,403 INFO L195 NwaCegarLoop]: trace histogram [58, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:46:46,415 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 08:46:46,609 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 08:46:46,609 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:46:46,609 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:46:46,609 INFO L85 PathProgramCache]: Analyzing trace with hash 1474682332, now seen corresponding path program 5 times [2023-04-01 08:46:46,610 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:46:46,610 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1122770815] [2023-04-01 08:46:46,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:46:46,610 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:46:46,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:46:49,101 INFO L134 CoverageAnalysis]: Checked inductivity of 1721 backedges. 2 proven. 1711 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-01 08:46:49,101 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:46:49,101 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1122770815] [2023-04-01 08:46:49,102 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1122770815] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:46:49,102 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1970433041] [2023-04-01 08:46:49,102 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 08:46:49,102 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:46:49,102 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:46:49,103 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 08:46:49,106 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 08:46:49,224 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-01 08:46:49,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:46:49,225 INFO L262 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 19 conjunts are in the unsatisfiable core [2023-04-01 08:46:49,232 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:46:49,688 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2023-04-01 08:46:49,780 INFO L134 CoverageAnalysis]: Checked inductivity of 1721 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2023-04-01 08:46:49,780 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:46:49,993 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2023-04-01 08:46:49,994 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 12 [2023-04-01 08:46:50,133 INFO L134 CoverageAnalysis]: Checked inductivity of 1721 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2023-04-01 08:46:50,134 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1970433041] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:46:50,134 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1680780597] [2023-04-01 08:46:50,135 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:46:50,135 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:46:50,135 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:46:50,135 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:46:50,136 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:46:50,155 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 08:46:50,566 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2023-04-01 08:46:50,596 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 08:46:50,598 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:46:52,067 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3468#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (exists ((v_main_~a~0_BEFORE_CALL_49 Int) (|v_old(#length)_BEFORE_CALL_47| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_47| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_47| (Array Int Int)) (|v_main_~#aa~0.base_BEFORE_CALL_49| Int)) (and (not (= (select |v_old(#memory_int)_BEFORE_CALL_47| 1) |v_old(#valid)_BEFORE_CALL_47|)) (= (select |v_old(#length)_BEFORE_CALL_47| 2) 25) (= 2 (select |v_old(#length)_BEFORE_CALL_47| 1)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_47| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_47| |v_main_~#aa~0.base_BEFORE_CALL_49|) 0) (not (= |v_main_~#aa~0.base_BEFORE_CALL_49| 1)) (not (= |v_main_~#aa~0.base_BEFORE_CALL_49| |#StackHeapBarrier|)) (not (= |v_old(#valid)_BEFORE_CALL_47| |v_old(#length)_BEFORE_CALL_47|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_47| 1) 0) 48) (= (select |v_old(#valid)_BEFORE_CALL_47| 2) 1) (= (select |v_old(#valid)_BEFORE_CALL_47| 0) 0) (not (= |v_main_~#aa~0.base_BEFORE_CALL_49| 2)) (not (= (select (select |#memory_int| |v_main_~#aa~0.base_BEFORE_CALL_49|) (* v_main_~a~0_BEFORE_CALL_49 4)) 0)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_47| 1) |v_old(#length)_BEFORE_CALL_47|)) (not (= |v_main_~#aa~0.base_BEFORE_CALL_49| 0)) (= (select |v_old(#valid)_BEFORE_CALL_47| 1) 1))) (= |#NULL.base| 0))' at error location [2023-04-01 08:46:52,068 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:46:52,068 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:46:52,068 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 12, 11] total 79 [2023-04-01 08:46:52,068 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672470266] [2023-04-01 08:46:52,068 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:46:52,069 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2023-04-01 08:46:52,069 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:46:52,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2023-04-01 08:46:52,072 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1931, Invalid=6625, Unknown=0, NotChecked=0, Total=8556 [2023-04-01 08:46:52,072 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand has 79 states, 78 states have (on average 1.358974358974359) internal successors, (106), 77 states have internal predecessors, (106), 5 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 08:46:55,069 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 08:46:57,098 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 08:46:59,125 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 08:47:01,149 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 08:47:03,175 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 08:47:05,210 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 08:47:07,238 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 08:47:09,264 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 08:47:11,294 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 08:47:13,324 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 08:47:15,352 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 08:47:17,386 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 08:47:19,415 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 08:47:21,459 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 08:47:23,953 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 08:47:25,985 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 08:47:28,022 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 08:47:30,059 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 08:47:32,095 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 08:47:34,133 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0]