/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-cav19/array_init_var_plus_ind.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 09:01:46,988 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 09:01:46,990 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 09:01:47,016 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 09:01:47,019 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 09:01:47,021 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 09:01:47,024 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 09:01:47,026 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 09:01:47,027 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 09:01:47,032 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 09:01:47,033 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 09:01:47,034 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 09:01:47,034 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 09:01:47,038 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 09:01:47,039 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 09:01:47,040 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 09:01:47,041 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 09:01:47,041 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 09:01:47,043 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 09:01:47,047 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 09:01:47,048 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 09:01:47,049 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 09:01:47,049 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 09:01:47,050 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 09:01:47,052 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-04-01 09:01:47,054 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 09:01:47,054 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 09:01:47,054 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 09:01:47,055 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 09:01:47,055 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 09:01:47,056 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 09:01:47,056 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 09:01:47,056 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 09:01:47,056 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 09:01:47,057 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 09:01:47,057 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 09:01:47,063 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 09:01:47,082 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 09:01:47,082 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 09:01:47,082 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 09:01:47,082 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 09:01:47,083 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 09:01:47,083 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 09:01:47,083 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 09:01:47,083 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 09:01:47,083 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 09:01:47,083 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 09:01:47,083 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 09:01:47,083 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 09:01:47,083 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 09:01:47,084 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 09:01:47,084 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 09:01:47,084 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 09:01:47,084 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 09:01:47,084 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 09:01:47,084 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 09:01:47,084 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 09:01:47,086 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 09:01:47,086 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 09:01:47,086 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 09:01:47,086 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 09:01:47,087 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 09:01:47,087 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 09:01:47,087 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 09:01:47,087 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 09:01:47,087 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 09:01:47,087 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 09:01:47,088 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 09:01:47,088 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 09:01:47,088 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 09:01:47,088 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 09:01:47,088 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 09:01:47,088 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 09:01:47,088 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 09:01:47,088 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 09:01:47,088 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 09:01:47,088 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 09:01:47,088 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 09:01:47,089 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> EqDomain [2023-04-01 09:01:47,247 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 09:01:47,259 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 09:01:47,261 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 09:01:47,261 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 09:01:47,262 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 09:01:47,263 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-cav19/array_init_var_plus_ind.c [2023-04-01 09:01:48,349 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 09:01:48,462 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 09:01:48,463 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-cav19/array_init_var_plus_ind.c [2023-04-01 09:01:48,467 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/22d553188/471665d91c714245a248ff99f6901ab8/FLAGd35859797 [2023-04-01 09:01:48,476 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/22d553188/471665d91c714245a248ff99f6901ab8 [2023-04-01 09:01:48,477 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 09:01:48,478 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 09:01:48,479 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 09:01:48,479 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 09:01:48,489 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 09:01:48,489 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 09:01:48" (1/1) ... [2023-04-01 09:01:48,490 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3d750cc1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:01:48, skipping insertion in model container [2023-04-01 09:01:48,490 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 09:01:48" (1/1) ... [2023-04-01 09:01:48,494 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 09:01:48,501 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 09:01:48,585 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-cav19/array_init_var_plus_ind.c[414,427] [2023-04-01 09:01:48,593 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 09:01:48,598 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 09:01:48,605 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-cav19/array_init_var_plus_ind.c[414,427] [2023-04-01 09:01:48,607 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 09:01:48,615 INFO L208 MainTranslator]: Completed translation [2023-04-01 09:01:48,616 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:01:48 WrapperNode [2023-04-01 09:01:48,616 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 09:01:48,616 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 09:01:48,616 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 09:01:48,617 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 09:01:48,623 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:01:48" (1/1) ... [2023-04-01 09:01:48,623 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:01:48" (1/1) ... [2023-04-01 09:01:48,627 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:01:48" (1/1) ... [2023-04-01 09:01:48,627 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:01:48" (1/1) ... [2023-04-01 09:01:48,630 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:01:48" (1/1) ... [2023-04-01 09:01:48,632 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:01:48" (1/1) ... [2023-04-01 09:01:48,633 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:01:48" (1/1) ... [2023-04-01 09:01:48,633 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:01:48" (1/1) ... [2023-04-01 09:01:48,634 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 09:01:48,635 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 09:01:48,635 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 09:01:48,635 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 09:01:48,636 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:01:48" (1/1) ... [2023-04-01 09:01:48,639 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 09:01:48,645 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:01:48,654 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 09:01:48,670 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 09:01:48,684 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 09:01:48,684 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 09:01:48,684 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 09:01:48,684 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-01 09:01:48,685 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-01 09:01:48,685 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 09:01:48,685 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 09:01:48,685 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 09:01:48,685 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 09:01:48,685 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 09:01:48,685 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-01 09:01:48,685 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 09:01:48,685 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 09:01:48,685 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 09:01:48,686 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-01 09:01:48,686 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 09:01:48,686 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 09:01:48,686 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 09:01:48,686 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 09:01:48,686 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 09:01:48,686 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 09:01:48,740 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 09:01:48,742 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 09:01:48,907 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 09:01:48,944 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 09:01:48,945 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-04-01 09:01:48,948 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 09:01:48 BoogieIcfgContainer [2023-04-01 09:01:48,948 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 09:01:48,951 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 09:01:48,951 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 09:01:48,953 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 09:01:48,953 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 09:01:48" (1/3) ... [2023-04-01 09:01:48,954 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f480c80 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 09:01:48, skipping insertion in model container [2023-04-01 09:01:48,954 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:01:48" (2/3) ... [2023-04-01 09:01:48,954 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f480c80 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 09:01:48, skipping insertion in model container [2023-04-01 09:01:48,954 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 09:01:48" (3/3) ... [2023-04-01 09:01:48,955 INFO L112 eAbstractionObserver]: Analyzing ICFG array_init_var_plus_ind.c [2023-04-01 09:01:48,968 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 09:01:48,968 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 09:01:49,004 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 09:01:49,008 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;@2f49838e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 09:01:49,009 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 09:01:49,012 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 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 09:01:49,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-04-01 09:01:49,016 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:01:49,017 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:01:49,017 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:01:49,021 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:01:49,021 INFO L85 PathProgramCache]: Analyzing trace with hash -1238852914, now seen corresponding path program 1 times [2023-04-01 09:01:49,027 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:01:49,027 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1273256148] [2023-04-01 09:01:49,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:01:49,028 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:01:49,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:01:49,235 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 09:01:49,236 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:01:49,236 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1273256148] [2023-04-01 09:01:49,236 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1273256148] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 09:01:49,236 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 09:01:49,237 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-01 09:01:49,250 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287393832] [2023-04-01 09:01:49,250 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 09:01:49,253 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-01 09:01:49,253 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:01:49,287 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-01 09:01:49,288 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-01 09:01:49,289 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 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 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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 09:01:49,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:01:49,346 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2023-04-01 09:01:49,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-01 09:01:49,348 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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 12 [2023-04-01 09:01:49,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:01:49,353 INFO L225 Difference]: With dead ends: 40 [2023-04-01 09:01:49,353 INFO L226 Difference]: Without dead ends: 23 [2023-04-01 09:01:49,355 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-01 09:01:49,357 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 31 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 09:01:49,358 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 22 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 09:01:49,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-04-01 09:01:49,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 18. [2023-04-01 09:01:49,380 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 09:01:49,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2023-04-01 09:01:49,381 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 12 [2023-04-01 09:01:49,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:01:49,381 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2023-04-01 09:01:49,382 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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 09:01:49,382 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2023-04-01 09:01:49,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-04-01 09:01:49,382 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:01:49,382 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:01:49,382 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 09:01:49,383 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:01:49,383 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:01:49,383 INFO L85 PathProgramCache]: Analyzing trace with hash -1744764798, now seen corresponding path program 1 times [2023-04-01 09:01:49,383 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:01:49,384 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1836541208] [2023-04-01 09:01:49,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:01:49,384 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:01:49,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:01:49,445 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 09:01:49,445 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:01:49,445 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1836541208] [2023-04-01 09:01:49,446 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1836541208] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 09:01:49,446 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 09:01:49,446 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-01 09:01:49,446 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1030762766] [2023-04-01 09:01:49,446 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 09:01:49,447 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-01 09:01:49,447 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:01:49,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-01 09:01:49,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-01 09:01:49,448 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 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 09:01:49,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:01:49,479 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2023-04-01 09:01:49,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-01 09:01:49,479 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 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 09:01:49,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:01:49,480 INFO L225 Difference]: With dead ends: 30 [2023-04-01 09:01:49,480 INFO L226 Difference]: Without dead ends: 19 [2023-04-01 09:01:49,480 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-01 09:01:49,481 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 09:01:49,482 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 37 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 09:01:49,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-04-01 09:01:49,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-04-01 09:01:49,499 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 09:01:49,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2023-04-01 09:01:49,499 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 13 [2023-04-01 09:01:49,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:01:49,499 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2023-04-01 09:01:49,500 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 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 09:01:49,500 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2023-04-01 09:01:49,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-04-01 09:01:49,500 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:01:49,500 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:01:49,500 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-01 09:01:49,500 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:01:49,501 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:01:49,501 INFO L85 PathProgramCache]: Analyzing trace with hash -134139207, now seen corresponding path program 1 times [2023-04-01 09:01:49,501 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:01:49,501 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1194114885] [2023-04-01 09:01:49,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:01:49,501 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:01:49,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:01:49,621 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 09:01:49,621 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:01:49,621 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1194114885] [2023-04-01 09:01:49,621 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1194114885] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 09:01:49,621 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [901627943] [2023-04-01 09:01:49,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:01:49,622 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:01:49,622 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:01:49,625 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 09:01:49,627 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 09:01:49,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:01:49,692 INFO L262 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-01 09:01:49,695 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:01:49,772 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 09:01:49,773 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:01:49,857 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 09:01:49,857 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [901627943] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:01:49,857 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1048704301] [2023-04-01 09:01:49,911 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-01 09:01:49,911 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:01:49,913 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:01:49,923 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:01:49,924 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:01:50,112 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 52 for LOIs [2023-04-01 09:01:50,509 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 73 for LOIs [2023-04-01 09:01:50,559 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:01:50,564 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:01:51,338 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '275#(and (exists ((|v_old(#length)_BEFORE_CALL_1| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_1| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_1| (Array Int Int)) (|v_main_~#a~0.base_BEFORE_CALL_1| Int)) (and (= (select |v_old(#valid)_BEFORE_CALL_1| 3) 1) (not (= |v_old(#valid)_BEFORE_CALL_1| |v_old(#length)_BEFORE_CALL_1|)) (= (select |v_old(#length)_BEFORE_CALL_1| 3) 12) (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) 26) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_1|)) (= 2 (select |v_old(#length)_BEFORE_CALL_1| 1)) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_1|)) (= (select |v_old(#valid)_BEFORE_CALL_1| 2) 1) (not (= (select |v_old(#memory_int)_BEFORE_CALL_1| 1) |v_old(#length)_BEFORE_CALL_1|)) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_1|)) (= (select |v_old(#valid)_BEFORE_CALL_1| 0) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_1| 1) 1) 0) (< (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_1|) 4) 0) (= (select |v_old(#valid)_BEFORE_CALL_1| |v_main_~#a~0.base_BEFORE_CALL_1|) 0) (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_1|)) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_1|)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0) (= 100000 ~N~0))' at error location [2023-04-01 09:01:51,338 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:01:51,338 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 09:01:51,338 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 11 [2023-04-01 09:01:51,338 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623447456] [2023-04-01 09:01:51,338 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 09:01:51,339 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-04-01 09:01:51,339 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:01:51,339 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-04-01 09:01:51,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2023-04-01 09:01:51,340 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 11 states, 11 states have (on average 2.0) internal successors, (22), 11 states have internal predecessors, (22), 4 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2023-04-01 09:01:51,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:01:51,435 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2023-04-01 09:01:51,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-01 09:01:51,435 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 11 states have internal predecessors, (22), 4 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) Word has length 14 [2023-04-01 09:01:51,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:01:51,436 INFO L225 Difference]: With dead ends: 44 [2023-04-01 09:01:51,436 INFO L226 Difference]: Without dead ends: 32 [2023-04-01 09:01:51,437 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 203 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=133, Invalid=569, Unknown=0, NotChecked=0, Total=702 [2023-04-01 09:01:51,437 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 41 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 09:01:51,438 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 55 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 09:01:51,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-04-01 09:01:51,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 24. [2023-04-01 09:01:51,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 18 states have internal predecessors, (22), 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 09:01:51,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2023-04-01 09:01:51,443 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 14 [2023-04-01 09:01:51,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:01:51,444 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2023-04-01 09:01:51,444 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 11 states have internal predecessors, (22), 4 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2023-04-01 09:01:51,444 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2023-04-01 09:01:51,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-04-01 09:01:51,444 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:01:51,444 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:01:51,452 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 09:01:51,649 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 09:01:51,650 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:01:51,650 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:01:51,650 INFO L85 PathProgramCache]: Analyzing trace with hash 628245036, now seen corresponding path program 1 times [2023-04-01 09:01:51,650 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:01:51,650 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1607040197] [2023-04-01 09:01:51,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:01:51,650 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:01:51,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:01:51,836 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:01:51,836 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:01:51,836 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1607040197] [2023-04-01 09:01:51,837 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1607040197] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 09:01:51,837 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1595637838] [2023-04-01 09:01:51,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:01:51,837 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:01:51,837 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:01:51,838 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 09:01:51,840 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 09:01:51,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:01:51,874 INFO L262 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 20 conjunts are in the unsatisfiable core [2023-04-01 09:01:51,875 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:01:51,946 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 09:01:51,982 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 09:01:52,001 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:01:52,001 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:01:52,028 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 16 treesize of output 14 [2023-04-01 09:01:52,054 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2023-04-01 09:01:52,096 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:01:52,097 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1595637838] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:01:52,097 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1095168949] [2023-04-01 09:01:52,098 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-01 09:01:52,098 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:01:52,098 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:01:52,098 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:01:52,098 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:01:52,142 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 52 for LOIs [2023-04-01 09:01:52,332 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 83 for LOIs [2023-04-01 09:01:52,382 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:01:52,386 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:01:53,266 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '511#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (exists ((|v_main_~#a~0.base_BEFORE_CALL_2| Int) (|v_old(#valid)_BEFORE_CALL_2| (Array Int Int)) (|v_old(#length)_BEFORE_CALL_2| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_2| (Array Int (Array Int Int)))) (and (= 2 (select |v_old(#length)_BEFORE_CALL_2| 1)) (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_2|)) (= (select |v_old(#length)_BEFORE_CALL_2| 2) 26) (< (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_2|) 4) 0) (= (select |v_old(#length)_BEFORE_CALL_2| 3) 12) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_2|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_2| 1) 1) 0) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_2|)) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_2|)) (= (select |v_old(#valid)_BEFORE_CALL_2| 0) 0) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_2| 1) 0)) (not (= |v_old(#length)_BEFORE_CALL_2| (select |v_old(#memory_int)_BEFORE_CALL_2| 1))) (not (= |v_old(#valid)_BEFORE_CALL_2| (select |v_old(#memory_int)_BEFORE_CALL_2| 1))) (not (= |v_old(#valid)_BEFORE_CALL_2| |v_old(#length)_BEFORE_CALL_2|)) (= (select |v_old(#valid)_BEFORE_CALL_2| 2) 1) (= (select |v_old(#valid)_BEFORE_CALL_2| |v_main_~#a~0.base_BEFORE_CALL_2|) 0) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_2|)) (= (select |v_old(#valid)_BEFORE_CALL_2| 3) 1) (= (select |v_old(#valid)_BEFORE_CALL_2| 1) 1))) (= |#NULL.offset| 0) (= |#NULL.base| 0) (= 100000 ~N~0))' at error location [2023-04-01 09:01:53,266 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:01:53,266 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 09:01:53,266 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2023-04-01 09:01:53,266 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312224689] [2023-04-01 09:01:53,267 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 09:01:53,267 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-04-01 09:01:53,267 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:01:53,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-04-01 09:01:53,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=730, Unknown=0, NotChecked=0, Total=812 [2023-04-01 09:01:53,268 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 17 states, 16 states have (on average 1.8125) internal successors, (29), 15 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 09:01:53,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:01:53,385 INFO L93 Difference]: Finished difference Result 37 states and 41 transitions. [2023-04-01 09:01:53,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-01 09:01:53,398 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.8125) internal successors, (29), 15 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 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 09:01:53,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:01:53,398 INFO L225 Difference]: With dead ends: 37 [2023-04-01 09:01:53,398 INFO L226 Difference]: Without dead ends: 35 [2023-04-01 09:01:53,399 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=101, Invalid=891, Unknown=0, NotChecked=0, Total=992 [2023-04-01 09:01:53,399 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 13 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 09:01:53,399 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 115 Invalid, 165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 161 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 09:01:53,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-04-01 09:01:53,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 31. [2023-04-01 09:01:53,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 23 states have (on average 1.173913043478261) internal successors, (27), 24 states have internal predecessors, (27), 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 09:01:53,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2023-04-01 09:01:53,404 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 17 [2023-04-01 09:01:53,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:01:53,404 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2023-04-01 09:01:53,404 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 1.8125) internal successors, (29), 15 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 09:01:53,404 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2023-04-01 09:01:53,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-04-01 09:01:53,404 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:01:53,405 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:01:53,409 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 09:01:53,609 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 09:01:53,609 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:01:53,610 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:01:53,610 INFO L85 PathProgramCache]: Analyzing trace with hash -2023561951, now seen corresponding path program 2 times [2023-04-01 09:01:53,610 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:01:53,610 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1478435747] [2023-04-01 09:01:53,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:01:53,610 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:01:53,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:01:53,775 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:01:53,775 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:01:53,775 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1478435747] [2023-04-01 09:01:53,775 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1478435747] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 09:01:53,775 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1016085211] [2023-04-01 09:01:53,775 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 09:01:53,775 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:01:53,776 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:01:53,776 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 09:01:53,789 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 09:01:53,824 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-01 09:01:53,825 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 09:01:53,825 INFO L262 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 23 conjunts are in the unsatisfiable core [2023-04-01 09:01:53,827 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:01:53,868 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 09:01:53,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 09:01:53,891 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2023-04-01 09:01:53,929 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 09:01:53,952 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:01:53,952 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:01:54,000 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 21 treesize of output 19 [2023-04-01 09:01:54,002 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2023-04-01 09:01:54,040 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:01:54,040 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1016085211] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:01:54,040 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1288994628] [2023-04-01 09:01:54,042 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-01 09:01:54,042 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:01:54,042 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:01:54,042 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:01:54,042 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:01:54,070 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 52 for LOIs [2023-04-01 09:01:54,225 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 83 for LOIs [2023-04-01 09:01:54,250 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:01:54,254 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:01:55,198 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '758#(and (exists ((|v_main_~#a~0.base_BEFORE_CALL_3| Int) (|v_old(#length)_BEFORE_CALL_3| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_3| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_3| (Array Int Int))) (and (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_3|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_3| 1) 0) 48) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_3|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_3| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_3| 0) 0) (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_3|)) (not (= |v_old(#valid)_BEFORE_CALL_3| |v_old(#length)_BEFORE_CALL_3|)) (< (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_3|) 4) 0) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_3|)) (= 2 (select |v_old(#length)_BEFORE_CALL_3| 1)) (= (select |v_old(#length)_BEFORE_CALL_3| 3) 12) (not (= |v_old(#length)_BEFORE_CALL_3| (select |v_old(#memory_int)_BEFORE_CALL_3| 1))) (= (select |v_old(#valid)_BEFORE_CALL_3| |v_main_~#a~0.base_BEFORE_CALL_3|) 0) (= (select |v_old(#length)_BEFORE_CALL_3| 2) 26) (not (= |v_old(#valid)_BEFORE_CALL_3| (select |v_old(#memory_int)_BEFORE_CALL_3| 1))) (= (select |v_old(#valid)_BEFORE_CALL_3| 2) 1) (= (select |v_old(#valid)_BEFORE_CALL_3| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_3| 3) 1) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_3|)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0) (= 100000 ~N~0))' at error location [2023-04-01 09:01:55,198 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:01:55,198 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 09:01:55,198 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2023-04-01 09:01:55,199 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [365592312] [2023-04-01 09:01:55,199 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 09:01:55,199 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-04-01 09:01:55,199 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:01:55,200 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-04-01 09:01:55,200 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=785, Unknown=0, NotChecked=0, Total=870 [2023-04-01 09:01:55,200 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand has 18 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 16 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 09:01:55,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:01:55,325 INFO L93 Difference]: Finished difference Result 40 states and 43 transitions. [2023-04-01 09:01:55,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-01 09:01:55,325 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 16 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2023-04-01 09:01:55,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:01:55,326 INFO L225 Difference]: With dead ends: 40 [2023-04-01 09:01:55,326 INFO L226 Difference]: Without dead ends: 38 [2023-04-01 09:01:55,327 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 223 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=114, Invalid=1008, Unknown=0, NotChecked=0, Total=1122 [2023-04-01 09:01:55,328 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 28 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 09:01:55,328 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 106 Invalid, 175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 165 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 09:01:55,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-04-01 09:01:55,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 30. [2023-04-01 09:01:55,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 23 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 09:01:55,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions. [2023-04-01 09:01:55,332 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 19 [2023-04-01 09:01:55,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:01:55,332 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 33 transitions. [2023-04-01 09:01:55,332 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 16 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 09:01:55,332 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions. [2023-04-01 09:01:55,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-04-01 09:01:55,335 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:01:55,335 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:01:55,353 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 09:01:55,535 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 09:01:55,536 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:01:55,536 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:01:55,536 INFO L85 PathProgramCache]: Analyzing trace with hash -1099424118, now seen corresponding path program 1 times [2023-04-01 09:01:55,536 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:01:55,536 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [856369753] [2023-04-01 09:01:55,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:01:55,536 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:01:55,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:01:55,616 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:01:55,616 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:01:55,617 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [856369753] [2023-04-01 09:01:55,617 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [856369753] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 09:01:55,617 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [721363938] [2023-04-01 09:01:55,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:01:55,617 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:01:55,617 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:01:55,618 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 09:01:55,620 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 09:01:55,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:01:55,653 INFO L262 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-01 09:01:55,654 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:01:55,684 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:01:55,684 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:01:55,723 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:01:55,723 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [721363938] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:01:55,723 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1539786258] [2023-04-01 09:01:55,724 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-04-01 09:01:55,724 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:01:55,724 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:01:55,724 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:01:55,724 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:01:55,747 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 52 for LOIs [2023-04-01 09:01:56,210 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 75 for LOIs [2023-04-01 09:01:56,247 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:01:56,250 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:01:57,241 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1033#(and (exists ((|v_old(#memory_int)_BEFORE_CALL_10| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_10| (Array Int Int)) (v_main_~k~0_BEFORE_CALL_12 Int) (|v_main_~#a~0.base_BEFORE_CALL_10| Int) (|v_old(#length)_BEFORE_CALL_10| (Array Int Int))) (and (not (= |v_old(#valid)_BEFORE_CALL_10| |v_old(#length)_BEFORE_CALL_10|)) (= (select |v_old(#length)_BEFORE_CALL_10| 3) 12) (not (= |v_main_~#a~0.base_BEFORE_CALL_10| 2)) (not (= |v_main_~#a~0.base_BEFORE_CALL_10| 0)) (not (= |v_main_~#a~0.base_BEFORE_CALL_10| 1)) (not (= |v_old(#valid)_BEFORE_CALL_10| (select |v_old(#memory_int)_BEFORE_CALL_10| 1))) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_10| 1) 0)) (= 2 (select |v_old(#length)_BEFORE_CALL_10| 1)) (= (select |v_old(#valid)_BEFORE_CALL_10| 3) 1) (= (select |v_old(#length)_BEFORE_CALL_10| 2) 26) (< (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_10|) (* v_main_~k~0_BEFORE_CALL_12 4)) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_10| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_10| 1) 1) (not (= (select |v_old(#memory_int)_BEFORE_CALL_10| 1) |v_old(#length)_BEFORE_CALL_10|)) (not (= |v_main_~#a~0.base_BEFORE_CALL_10| |#StackHeapBarrier|)) (= (select |v_old(#valid)_BEFORE_CALL_10| 2) 1) (= (select |v_old(#valid)_BEFORE_CALL_10| |v_main_~#a~0.base_BEFORE_CALL_10|) 0) (= (select |v_old(#valid)_BEFORE_CALL_10| 0) 0) (not (= |v_main_~#a~0.base_BEFORE_CALL_10| 3)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0) (= 100000 ~N~0))' at error location [2023-04-01 09:01:57,241 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:01:57,241 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 09:01:57,242 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 11 [2023-04-01 09:01:57,242 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1516016837] [2023-04-01 09:01:57,242 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 09:01:57,243 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-04-01 09:01:57,243 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:01:57,243 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-04-01 09:01:57,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=520, Unknown=0, NotChecked=0, Total=600 [2023-04-01 09:01:57,244 INFO L87 Difference]: Start difference. First operand 30 states and 33 transitions. Second operand has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 11 states have internal predecessors, (28), 5 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 09:01:57,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:01:57,268 INFO L93 Difference]: Finished difference Result 44 states and 48 transitions. [2023-04-01 09:01:57,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-01 09:01:57,268 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 11 states have internal predecessors, (28), 5 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 24 [2023-04-01 09:01:57,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:01:57,271 INFO L225 Difference]: With dead ends: 44 [2023-04-01 09:01:57,271 INFO L226 Difference]: Without dead ends: 30 [2023-04-01 09:01:57,272 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 207 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=80, Invalid=520, Unknown=0, NotChecked=0, Total=600 [2023-04-01 09:01:57,273 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 0 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 09:01:57,273 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 47 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 09:01:57,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-04-01 09:01:57,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2023-04-01 09:01:57,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 23 states have internal predecessors, (25), 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 09:01:57,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2023-04-01 09:01:57,286 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 24 [2023-04-01 09:01:57,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:01:57,286 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2023-04-01 09:01:57,286 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 11 states have internal predecessors, (28), 5 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 09:01:57,286 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2023-04-01 09:01:57,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-04-01 09:01:57,287 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:01:57,287 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:01:57,292 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 09:01:57,492 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 09:01:57,492 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:01:57,493 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:01:57,493 INFO L85 PathProgramCache]: Analyzing trace with hash 929902069, now seen corresponding path program 2 times [2023-04-01 09:01:57,493 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:01:57,493 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1788785243] [2023-04-01 09:01:57,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:01:57,493 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:01:57,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:01:57,749 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:01:57,750 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:01:57,750 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1788785243] [2023-04-01 09:01:57,750 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1788785243] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 09:01:57,750 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1546748696] [2023-04-01 09:01:57,750 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 09:01:57,750 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:01:57,750 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:01:57,752 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 09:01:57,754 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 09:01:57,809 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-01 09:01:57,809 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 09:01:57,810 INFO L262 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 30 conjunts are in the unsatisfiable core [2023-04-01 09:01:57,812 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:01:57,869 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 09:01:58,011 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 09:01:58,043 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:01:58,043 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:01:58,155 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 18 treesize of output 16 [2023-04-01 09:01:58,159 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2023-04-01 09:01:58,271 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:01:58,271 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1546748696] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:01:58,271 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [497292487] [2023-04-01 09:01:58,272 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-04-01 09:01:58,272 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:01:58,273 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:01:58,273 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:01:58,273 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:01:58,295 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 52 for LOIs [2023-04-01 09:01:58,725 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 75 for LOIs [2023-04-01 09:01:58,760 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:01:58,763 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:01:59,795 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1339#(and (exists ((|v_old(#length)_BEFORE_CALL_19| (Array Int Int)) (v_main_~k~0_BEFORE_CALL_23 Int) (|v_old(#memory_int)_BEFORE_CALL_19| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_19| (Array Int Int)) (|v_main_~#a~0.base_BEFORE_CALL_21| Int)) (and (= (select (select |v_old(#memory_int)_BEFORE_CALL_19| 1) 0) 48) (= 12 (select |v_old(#length)_BEFORE_CALL_19| 3)) (< (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_21|) (* v_main_~k~0_BEFORE_CALL_23 4)) 0) (not (= |v_main_~#a~0.base_BEFORE_CALL_21| 1)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_19| 1) |v_old(#valid)_BEFORE_CALL_19|)) (= (select |v_old(#valid)_BEFORE_CALL_19| |v_main_~#a~0.base_BEFORE_CALL_21|) 0) (not (= (select |v_old(#memory_int)_BEFORE_CALL_19| 1) |v_old(#length)_BEFORE_CALL_19|)) (= (select |v_old(#valid)_BEFORE_CALL_19| 0) 0) (= (select |v_old(#valid)_BEFORE_CALL_19| 3) 1) (= (select |v_old(#length)_BEFORE_CALL_19| 1) 2) (not (= |v_main_~#a~0.base_BEFORE_CALL_21| |#StackHeapBarrier|)) (= (select |v_old(#length)_BEFORE_CALL_19| 2) 26) (not (= |v_main_~#a~0.base_BEFORE_CALL_21| 3)) (= (select |v_old(#valid)_BEFORE_CALL_19| 2) 1) (not (= |v_main_~#a~0.base_BEFORE_CALL_21| 2)) (not (= |v_main_~#a~0.base_BEFORE_CALL_21| 0)) (= 1 (select |v_old(#valid)_BEFORE_CALL_19| 1)) (not (= |v_old(#valid)_BEFORE_CALL_19| |v_old(#length)_BEFORE_CALL_19|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_19| 1) 1) 0))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0) (= 100000 ~N~0))' at error location [2023-04-01 09:01:59,795 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:01:59,796 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 09:01:59,796 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14, 11] total 29 [2023-04-01 09:01:59,796 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1482688826] [2023-04-01 09:01:59,796 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 09:01:59,796 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-04-01 09:01:59,796 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:01:59,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-04-01 09:01:59,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=1669, Unknown=0, NotChecked=0, Total=1806 [2023-04-01 09:01:59,797 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 29 states, 27 states have (on average 1.8888888888888888) internal successors, (51), 26 states have internal predecessors, (51), 6 states have call successors, (8), 4 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 09:02:01,836 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 09:02:03,852 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 09:02:05,904 WARN L539 Checker$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 09:02:07,977 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 09:02:08,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:02:08,312 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2023-04-01 09:02:08,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-04-01 09:02:08,312 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 27 states have (on average 1.8888888888888888) internal successors, (51), 26 states have internal predecessors, (51), 6 states have call successors, (8), 4 states have call predecessors, (8), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 26 [2023-04-01 09:02:08,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:02:08,314 INFO L225 Difference]: With dead ends: 60 [2023-04-01 09:02:08,314 INFO L226 Difference]: Without dead ends: 58 [2023-04-01 09:02:08,316 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 763 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=252, Invalid=2718, Unknown=0, NotChecked=0, Total=2970 [2023-04-01 09:02:08,317 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 31 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 351 mSolverCounterSat, 25 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 380 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 351 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.2s IncrementalHoareTripleChecker+Time [2023-04-01 09:02:08,318 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 201 Invalid, 380 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 351 Invalid, 4 Unknown, 0 Unchecked, 8.2s Time] [2023-04-01 09:02:08,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-04-01 09:02:08,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 48. [2023-04-01 09:02:08,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 35 states have (on average 1.1142857142857143) internal successors, (39), 37 states have internal predecessors, (39), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-01 09:02:08,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2023-04-01 09:02:08,343 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 26 [2023-04-01 09:02:08,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:02:08,343 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2023-04-01 09:02:08,344 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 27 states have (on average 1.8888888888888888) internal successors, (51), 26 states have internal predecessors, (51), 6 states have call successors, (8), 4 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 09:02:08,344 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2023-04-01 09:02:08,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-04-01 09:02:08,345 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:02:08,345 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:02:08,357 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-04-01 09:02:08,562 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 09:02:08,562 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:02:08,563 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:02:08,563 INFO L85 PathProgramCache]: Analyzing trace with hash -385893636, now seen corresponding path program 1 times [2023-04-01 09:02:08,563 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:02:08,563 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2107831650] [2023-04-01 09:02:08,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:02:08,563 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:02:08,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:02:08,650 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 09:02:08,650 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:02:08,651 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2107831650] [2023-04-01 09:02:08,651 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2107831650] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 09:02:08,651 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1965892435] [2023-04-01 09:02:08,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:02:08,651 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:02:08,651 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:02:08,667 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 09:02:08,676 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 09:02:08,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:02:08,744 INFO L262 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 7 conjunts are in the unsatisfiable core [2023-04-01 09:02:08,745 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:02:08,796 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 09:02:08,796 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:02:08,851 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 09:02:08,852 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1965892435] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:02:08,852 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [658476971] [2023-04-01 09:02:08,853 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-04-01 09:02:08,853 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:02:08,853 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:02:08,853 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:02:08,853 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:02:08,893 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 52 for LOIs [2023-04-01 09:02:09,389 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 75 for LOIs [2023-04-01 09:02:09,423 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:02:09,425 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:02:10,051 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1712#(and (exists ((|v_main_~#a~0.base_BEFORE_CALL_30| Int) (|v_old(#memory_int)_BEFORE_CALL_28| (Array Int (Array Int Int))) (|v_old(#length)_BEFORE_CALL_28| (Array Int Int)) (|v_old(#valid)_BEFORE_CALL_28| (Array Int Int)) (v_main_~k~0_BEFORE_CALL_32 Int)) (and (= (select |v_old(#valid)_BEFORE_CALL_28| |v_main_~#a~0.base_BEFORE_CALL_30|) 0) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_28| 1) 0)) (= (select |v_old(#length)_BEFORE_CALL_28| 2) 26) (not (= |v_main_~#a~0.base_BEFORE_CALL_30| |#StackHeapBarrier|)) (not (= |v_main_~#a~0.base_BEFORE_CALL_30| 1)) (= (select |v_old(#valid)_BEFORE_CALL_28| 3) 1) (not (= (select |v_old(#memory_int)_BEFORE_CALL_28| 1) |v_old(#valid)_BEFORE_CALL_28|)) (= (select |v_old(#valid)_BEFORE_CALL_28| 0) 0) (not (= |v_main_~#a~0.base_BEFORE_CALL_30| 0)) (= (select |v_old(#valid)_BEFORE_CALL_28| 1) 1) (not (= |v_main_~#a~0.base_BEFORE_CALL_30| 3)) (not (= |v_main_~#a~0.base_BEFORE_CALL_30| 2)) (= (select |v_old(#length)_BEFORE_CALL_28| 3) 12) (= (select (select |v_old(#memory_int)_BEFORE_CALL_28| 1) 1) 0) (not (= |v_old(#valid)_BEFORE_CALL_28| |v_old(#length)_BEFORE_CALL_28|)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_28| 1) |v_old(#length)_BEFORE_CALL_28|)) (= (select |v_old(#valid)_BEFORE_CALL_28| 2) 1) (< (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_30|) (* v_main_~k~0_BEFORE_CALL_32 4)) 0) (= 2 (select |v_old(#length)_BEFORE_CALL_28| 1)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0) (= 100000 ~N~0))' at error location [2023-04-01 09:02:10,052 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:02:10,052 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 09:02:10,052 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 19 [2023-04-01 09:02:10,052 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103186279] [2023-04-01 09:02:10,052 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 09:02:10,052 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-04-01 09:02:10,052 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:02:10,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-04-01 09:02:10,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=782, Unknown=0, NotChecked=0, Total=992 [2023-04-01 09:02:10,053 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand has 19 states, 19 states have (on average 2.263157894736842) internal successors, (43), 19 states have internal predecessors, (43), 4 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2023-04-01 09:02:10,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:02:10,207 INFO L93 Difference]: Finished difference Result 114 states and 142 transitions. [2023-04-01 09:02:10,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-04-01 09:02:10,208 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.263157894736842) internal successors, (43), 19 states have internal predecessors, (43), 4 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 27 [2023-04-01 09:02:10,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:02:10,209 INFO L225 Difference]: With dead ends: 114 [2023-04-01 09:02:10,209 INFO L226 Difference]: Without dead ends: 98 [2023-04-01 09:02:10,209 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 552 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=286, Invalid=1046, Unknown=0, NotChecked=0, Total=1332 [2023-04-01 09:02:10,210 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 115 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 09:02:10,210 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [117 Valid, 69 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 09:02:10,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2023-04-01 09:02:10,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 59. [2023-04-01 09:02:10,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 46 states have (on average 1.1956521739130435) internal successors, (55), 48 states have internal predecessors, (55), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-01 09:02:10,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 68 transitions. [2023-04-01 09:02:10,217 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 68 transitions. Word has length 27 [2023-04-01 09:02:10,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:02:10,217 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 68 transitions. [2023-04-01 09:02:10,217 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.263157894736842) internal successors, (43), 19 states have internal predecessors, (43), 4 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2023-04-01 09:02:10,217 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 68 transitions. [2023-04-01 09:02:10,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-04-01 09:02:10,218 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:02:10,218 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:02:10,222 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-04-01 09:02:10,418 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 09:02:10,418 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:02:10,419 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:02:10,419 INFO L85 PathProgramCache]: Analyzing trace with hash 1197215392, now seen corresponding path program 3 times [2023-04-01 09:02:10,419 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:02:10,419 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [743209183] [2023-04-01 09:02:10,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:02:10,419 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:02:10,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:02:10,592 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 2 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:02:10,592 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:02:10,592 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [743209183] [2023-04-01 09:02:10,592 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [743209183] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 09:02:10,592 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1197073626] [2023-04-01 09:02:10,592 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 09:02:10,592 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:02:10,592 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:02:10,593 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 09:02:10,595 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 09:02:10,636 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 09:02:10,637 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 09:02:10,637 INFO L262 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 26 conjunts are in the unsatisfiable core [2023-04-01 09:02:10,638 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:02:10,673 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-04-01 09:02:10,709 INFO L321 Elim1Store]: treesize reduction 21, result has 34.4 percent of original size [2023-04-01 09:02:10,709 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 26 [2023-04-01 09:02:11,314 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 19 treesize of output 7 [2023-04-01 09:02:11,345 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:02:11,345 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:02:11,981 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 25 treesize of output 23 [2023-04-01 09:02:11,984 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 50 [2023-04-01 09:02:12,059 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 2 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:02:12,059 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1197073626] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:02:12,059 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1771737041] [2023-04-01 09:02:12,061 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-04-01 09:02:12,061 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:02:12,061 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:02:12,061 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:02:12,061 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:02:12,080 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 52 for LOIs [2023-04-01 09:02:12,436 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 75 for LOIs [2023-04-01 09:02:12,474 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:02:12,477 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:02:16,645 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2189#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (exists ((|v_main_~#a~0.base_BEFORE_CALL_41| Int) (|v_old(#length)_BEFORE_CALL_37| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_37| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_37| (Array Int Int)) (v_main_~k~0_BEFORE_CALL_43 Int)) (and (not (= |v_main_~#a~0.base_BEFORE_CALL_41| 0)) (= (select |v_old(#valid)_BEFORE_CALL_37| 0) 0) (not (= |v_main_~#a~0.base_BEFORE_CALL_41| 1)) (= (select |v_old(#valid)_BEFORE_CALL_37| 3) 1) (= (select (select |v_old(#memory_int)_BEFORE_CALL_37| 1) 1) 0) (= 0 (select |v_old(#valid)_BEFORE_CALL_37| |v_main_~#a~0.base_BEFORE_CALL_41|)) (not (= |v_main_~#a~0.base_BEFORE_CALL_41| 2)) (= (select |v_old(#length)_BEFORE_CALL_37| 3) 12) (< (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_41|) (* v_main_~k~0_BEFORE_CALL_43 4)) 0) (not (= |v_main_~#a~0.base_BEFORE_CALL_41| 3)) (= 1 (select |v_old(#valid)_BEFORE_CALL_37| 1)) (not (= |v_old(#length)_BEFORE_CALL_37| (select |v_old(#memory_int)_BEFORE_CALL_37| 1))) (= 2 (select |v_old(#length)_BEFORE_CALL_37| 1)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_37| 1) 0) 48) (= (select |v_old(#length)_BEFORE_CALL_37| 2) 26) (= (select |v_old(#valid)_BEFORE_CALL_37| 2) 1) (not (= |v_old(#valid)_BEFORE_CALL_37| |v_old(#length)_BEFORE_CALL_37|)) (not (= |v_main_~#a~0.base_BEFORE_CALL_41| |#StackHeapBarrier|)) (not (= |v_old(#valid)_BEFORE_CALL_37| (select |v_old(#memory_int)_BEFORE_CALL_37| 1))))) (= |#NULL.base| 0) (= 100000 ~N~0))' at error location [2023-04-01 09:02:16,645 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:02:16,645 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 09:02:16,645 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 12] total 26 [2023-04-01 09:02:16,647 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962325794] [2023-04-01 09:02:16,647 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 09:02:16,648 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-04-01 09:02:16,648 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:02:16,649 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-04-01 09:02:16,649 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1424, Unknown=5, NotChecked=0, Total=1560 [2023-04-01 09:02:16,650 INFO L87 Difference]: Start difference. First operand 59 states and 68 transitions. Second operand has 26 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 24 states have internal predecessors, (50), 5 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-04-01 09:02:17,892 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.18s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 09:02:19,904 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 09:02:25,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:02:25,202 INFO L93 Difference]: Finished difference Result 73 states and 81 transitions. [2023-04-01 09:02:25,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-01 09:02:25,202 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 24 states have internal predecessors, (50), 5 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 28 [2023-04-01 09:02:25,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:02:25,203 INFO L225 Difference]: With dead ends: 73 [2023-04-01 09:02:25,203 INFO L226 Difference]: Without dead ends: 71 [2023-04-01 09:02:25,204 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 54 SyntacticMatches, 3 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 543 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=190, Invalid=1964, Unknown=8, NotChecked=0, Total=2162 [2023-04-01 09:02:25,204 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 26 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 229 mSolverCounterSat, 12 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 229 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2023-04-01 09:02:25,205 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 136 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 229 Invalid, 3 Unknown, 0 Unchecked, 4.0s Time] [2023-04-01 09:02:25,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2023-04-01 09:02:25,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 57. [2023-04-01 09:02:25,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 45 states have (on average 1.2) internal successors, (54), 46 states have internal predecessors, (54), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-01 09:02:25,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 65 transitions. [2023-04-01 09:02:25,211 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 65 transitions. Word has length 28 [2023-04-01 09:02:25,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:02:25,211 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 65 transitions. [2023-04-01 09:02:25,211 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 24 states have internal predecessors, (50), 5 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-04-01 09:02:25,211 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 65 transitions. [2023-04-01 09:02:25,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-04-01 09:02:25,212 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:02:25,212 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:02:25,217 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-04-01 09:02:25,412 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 09:02:25,412 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:02:25,412 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:02:25,413 INFO L85 PathProgramCache]: Analyzing trace with hash -700897386, now seen corresponding path program 4 times [2023-04-01 09:02:25,413 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:02:25,413 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1818662494] [2023-04-01 09:02:25,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:02:25,413 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:02:25,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:02:25,773 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 4 proven. 27 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 09:02:25,773 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:02:25,773 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1818662494] [2023-04-01 09:02:25,774 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1818662494] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 09:02:25,774 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [353905790] [2023-04-01 09:02:25,774 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 09:02:25,774 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:02:25,774 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:02:25,775 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 09:02:25,776 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 09:02:25,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:02:25,841 INFO L262 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 30 conjunts are in the unsatisfiable core [2023-04-01 09:02:25,843 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:02:25,910 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-04-01 09:02:26,156 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 09:02:26,158 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 09:02:26,158 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 17 treesize of output 10 [2023-04-01 09:02:26,185 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 09:02:26,185 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:02:26,279 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 18 treesize of output 16 [2023-04-01 09:02:26,281 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2023-04-01 09:02:26,377 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 4 proven. 27 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 09:02:26,377 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [353905790] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:02:26,377 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [933929606] [2023-04-01 09:02:26,378 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-04-01 09:02:26,378 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:02:26,378 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:02:26,378 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:02:26,378 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:02:26,398 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 52 for LOIs [2023-04-01 09:02:26,764 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 75 for LOIs [2023-04-01 09:02:26,798 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:02:26,800 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:02:27,850 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2644#(and (exists ((|v_old(#memory_int)_BEFORE_CALL_46| (Array Int (Array Int Int))) (|v_old(#length)_BEFORE_CALL_46| (Array Int Int)) (|v_old(#valid)_BEFORE_CALL_46| (Array Int Int)) (v_main_~k~0_BEFORE_CALL_56 Int) (|v_main_~#a~0.base_BEFORE_CALL_54| Int)) (and (not (= |v_main_~#a~0.base_BEFORE_CALL_54| 1)) (= (select |v_old(#valid)_BEFORE_CALL_46| |v_main_~#a~0.base_BEFORE_CALL_54|) 0) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_46| 1) 0)) (= (select |v_old(#valid)_BEFORE_CALL_46| 2) 1) (= (select (select |v_old(#memory_int)_BEFORE_CALL_46| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_46| 3) 1) (not (= |v_main_~#a~0.base_BEFORE_CALL_54| 2)) (not (= |v_old(#valid)_BEFORE_CALL_46| (select |v_old(#memory_int)_BEFORE_CALL_46| 1))) (not (= |v_main_~#a~0.base_BEFORE_CALL_54| |#StackHeapBarrier|)) (not (= |v_old(#valid)_BEFORE_CALL_46| |v_old(#length)_BEFORE_CALL_46|)) (= (select |v_old(#valid)_BEFORE_CALL_46| 0) 0) (not (= |v_old(#length)_BEFORE_CALL_46| (select |v_old(#memory_int)_BEFORE_CALL_46| 1))) (= 12 (select |v_old(#length)_BEFORE_CALL_46| 3)) (< (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_54|) (* v_main_~k~0_BEFORE_CALL_56 4)) 0) (= 26 (select |v_old(#length)_BEFORE_CALL_46| 2)) (= 2 (select |v_old(#length)_BEFORE_CALL_46| 1)) (not (= |v_main_~#a~0.base_BEFORE_CALL_54| 3)) (not (= |v_main_~#a~0.base_BEFORE_CALL_54| 0)) (= (select |v_old(#valid)_BEFORE_CALL_46| 1) 1))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0) (= 100000 ~N~0))' at error location [2023-04-01 09:02:27,850 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:02:27,850 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 09:02:27,850 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 13] total 30 [2023-04-01 09:02:27,851 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [110838437] [2023-04-01 09:02:27,851 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 09:02:27,851 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2023-04-01 09:02:27,851 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:02:27,851 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2023-04-01 09:02:27,852 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=1749, Unknown=0, NotChecked=0, Total=1892 [2023-04-01 09:02:27,852 INFO L87 Difference]: Start difference. First operand 57 states and 65 transitions. Second operand has 30 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 28 states have internal predecessors, (58), 9 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-04-01 09:02:29,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:02:29,865 INFO L93 Difference]: Finished difference Result 90 states and 101 transitions. [2023-04-01 09:02:29,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-04-01 09:02:29,865 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 28 states have internal predecessors, (58), 9 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 35 [2023-04-01 09:02:29,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:02:29,866 INFO L225 Difference]: With dead ends: 90 [2023-04-01 09:02:29,866 INFO L226 Difference]: Without dead ends: 65 [2023-04-01 09:02:29,866 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 70 SyntacticMatches, 5 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 639 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=203, Invalid=2347, Unknown=0, NotChecked=0, Total=2550 [2023-04-01 09:02:29,867 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 17 mSDsluCounter, 302 mSDsCounter, 0 mSdLazyCounter, 497 mSolverCounterSat, 8 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 324 SdHoareTripleChecker+Invalid, 507 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 497 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2023-04-01 09:02:29,867 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 324 Invalid, 507 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 497 Invalid, 2 Unknown, 0 Unchecked, 1.8s Time] [2023-04-01 09:02:29,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2023-04-01 09:02:29,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 57. [2023-04-01 09:02:29,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 45 states have (on average 1.1777777777777778) internal successors, (53), 46 states have internal predecessors, (53), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-01 09:02:29,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 64 transitions. [2023-04-01 09:02:29,873 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 64 transitions. Word has length 35 [2023-04-01 09:02:29,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:02:29,873 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 64 transitions. [2023-04-01 09:02:29,873 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 28 states have internal predecessors, (58), 9 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-04-01 09:02:29,874 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 64 transitions. [2023-04-01 09:02:29,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-04-01 09:02:29,874 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:02:29,874 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:02:29,889 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-04-01 09:02:30,074 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-04-01 09:02:30,075 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:02:30,075 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:02:30,075 INFO L85 PathProgramCache]: Analyzing trace with hash 1108662091, now seen corresponding path program 5 times [2023-04-01 09:02:30,075 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:02:30,075 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [511339637] [2023-04-01 09:02:30,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:02:30,075 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:02:30,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:02:30,368 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 4 proven. 37 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 09:02:30,369 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:02:30,369 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [511339637] [2023-04-01 09:02:30,369 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [511339637] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 09:02:30,369 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [968933058] [2023-04-01 09:02:30,369 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 09:02:30,369 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:02:30,369 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:02:30,375 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 09:02:30,377 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-04-01 09:02:30,430 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-04-01 09:02:30,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 09:02:30,431 INFO L262 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 38 conjunts are in the unsatisfiable core [2023-04-01 09:02:30,436 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:02:30,498 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-04-01 09:02:30,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 09:02:30,537 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2023-04-01 09:02:30,696 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 09:02:30,698 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 09:02:30,698 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 17 treesize of output 10 [2023-04-01 09:02:30,737 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 09:02:30,737 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:02:30,858 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 25 treesize of output 23 [2023-04-01 09:02:30,861 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 50 [2023-04-01 09:02:30,973 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 4 proven. 37 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 09:02:30,973 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [968933058] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:02:30,973 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [31732405] [2023-04-01 09:02:30,974 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-04-01 09:02:30,974 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:02:30,975 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:02:30,975 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:02:30,975 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:02:30,996 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 52 for LOIs [2023-04-01 09:02:31,337 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 75 for LOIs [2023-04-01 09:02:31,373 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:02:31,376 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:02:32,439 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3140#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (exists ((|v_old(#memory_int)_BEFORE_CALL_55| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_55| (Array Int Int)) (v_main_~k~0_BEFORE_CALL_69 Int) (|v_main_~#a~0.base_BEFORE_CALL_67| Int) (|v_old(#length)_BEFORE_CALL_55| (Array Int Int))) (and (= (select |v_old(#valid)_BEFORE_CALL_55| 2) 1) (not (= |v_old(#length)_BEFORE_CALL_55| (select |v_old(#memory_int)_BEFORE_CALL_55| 1))) (= 26 (select |v_old(#length)_BEFORE_CALL_55| 2)) (< (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_67|) (* v_main_~k~0_BEFORE_CALL_69 4)) 0) (not (= |v_main_~#a~0.base_BEFORE_CALL_67| 2)) (not (= |v_main_~#a~0.base_BEFORE_CALL_67| |#StackHeapBarrier|)) (= (select |v_old(#valid)_BEFORE_CALL_55| |v_main_~#a~0.base_BEFORE_CALL_67|) 0) (= (select |v_old(#length)_BEFORE_CALL_55| 3) 12) (not (= |v_old(#valid)_BEFORE_CALL_55| |v_old(#length)_BEFORE_CALL_55|)) (= (select |v_old(#valid)_BEFORE_CALL_55| 0) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_55| 1) 0) 48) (not (= |v_old(#valid)_BEFORE_CALL_55| (select |v_old(#memory_int)_BEFORE_CALL_55| 1))) (= 2 (select |v_old(#length)_BEFORE_CALL_55| 1)) (not (= |v_main_~#a~0.base_BEFORE_CALL_67| 0)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_55| 1) 1) 0) (not (= |v_main_~#a~0.base_BEFORE_CALL_67| 3)) (= (select |v_old(#valid)_BEFORE_CALL_55| 1) 1) (not (= |v_main_~#a~0.base_BEFORE_CALL_67| 1)) (= (select |v_old(#valid)_BEFORE_CALL_55| 3) 1))) (= |#NULL.base| 0) (= 100000 ~N~0))' at error location [2023-04-01 09:02:32,439 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:02:32,439 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 09:02:32,439 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17, 14] total 32 [2023-04-01 09:02:32,440 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803018309] [2023-04-01 09:02:32,440 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 09:02:32,440 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-04-01 09:02:32,440 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:02:32,441 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-04-01 09:02:32,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=1922, Unknown=0, NotChecked=0, Total=2070 [2023-04-01 09:02:32,441 INFO L87 Difference]: Start difference. First operand 57 states and 64 transitions. Second operand has 32 states, 30 states have (on average 2.033333333333333) internal successors, (61), 30 states have internal predecessors, (61), 7 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2023-04-01 09:02:34,463 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 09:02:36,482 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 09:02:38,501 WARN L539 Checker$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 09:02:38,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:02:38,942 INFO L93 Difference]: Finished difference Result 89 states and 96 transitions. [2023-04-01 09:02:38,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-04-01 09:02:38,942 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 30 states have (on average 2.033333333333333) internal successors, (61), 30 states have internal predecessors, (61), 7 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 37 [2023-04-01 09:02:38,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:02:38,943 INFO L225 Difference]: With dead ends: 89 [2023-04-01 09:02:38,943 INFO L226 Difference]: Without dead ends: 87 [2023-04-01 09:02:38,944 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 73 SyntacticMatches, 7 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 774 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=253, Invalid=2827, Unknown=0, NotChecked=0, Total=3080 [2023-04-01 09:02:38,944 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 40 mSDsluCounter, 293 mSDsCounter, 0 mSdLazyCounter, 541 mSolverCounterSat, 18 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 315 SdHoareTripleChecker+Invalid, 562 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 541 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.2s IncrementalHoareTripleChecker+Time [2023-04-01 09:02:38,944 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 315 Invalid, 562 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 541 Invalid, 3 Unknown, 0 Unchecked, 6.2s Time] [2023-04-01 09:02:38,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2023-04-01 09:02:38,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 56. [2023-04-01 09:02:38,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 44 states have (on average 1.1818181818181819) internal successors, (52), 45 states have internal predecessors, (52), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-01 09:02:38,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 63 transitions. [2023-04-01 09:02:38,952 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 63 transitions. Word has length 37 [2023-04-01 09:02:38,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:02:38,952 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 63 transitions. [2023-04-01 09:02:38,952 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 30 states have (on average 2.033333333333333) internal successors, (61), 30 states have internal predecessors, (61), 7 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2023-04-01 09:02:38,952 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 63 transitions. [2023-04-01 09:02:38,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-04-01 09:02:38,952 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:02:38,953 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:02:38,964 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-04-01 09:02:39,157 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:02:39,157 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:02:39,157 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:02:39,158 INFO L85 PathProgramCache]: Analyzing trace with hash -1722067851, now seen corresponding path program 6 times [2023-04-01 09:02:39,158 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:02:39,158 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1847685198] [2023-04-01 09:02:39,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:02:39,158 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:02:39,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:02:39,234 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 14 proven. 19 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 09:02:39,234 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:02:39,234 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1847685198] [2023-04-01 09:02:39,234 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1847685198] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 09:02:39,234 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1304833476] [2023-04-01 09:02:39,234 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 09:02:39,235 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:02:39,235 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:02:39,241 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 09:02:39,257 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-04-01 09:02:39,295 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 09:02:39,295 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 09:02:39,296 INFO L262 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-01 09:02:39,297 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:02:39,354 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 26 proven. 12 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-04-01 09:02:39,354 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:02:39,389 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 20 proven. 12 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-04-01 09:02:39,389 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1304833476] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:02:39,389 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [204827257] [2023-04-01 09:02:39,391 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-04-01 09:02:39,391 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:02:39,391 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:02:39,391 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:02:39,391 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:02:39,422 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 52 for LOIs [2023-04-01 09:02:39,762 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 75 for LOIs [2023-04-01 09:02:39,795 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:02:39,797 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:02:40,588 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3637#(and (= |__VERIFIER_assert_#in~cond| 0) (exists ((|v_old(#valid)_BEFORE_CALL_64| (Array Int Int)) (v_main_~k~0_BEFORE_CALL_82 Int) (|v_main_~#a~0.base_BEFORE_CALL_76| Int) (|v_old(#length)_BEFORE_CALL_64| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_64| (Array Int (Array Int Int)))) (and (not (= |v_main_~#a~0.base_BEFORE_CALL_76| 1)) (not (= |v_main_~#a~0.base_BEFORE_CALL_76| 3)) (not (= |v_old(#valid)_BEFORE_CALL_64| |v_old(#length)_BEFORE_CALL_64|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_64| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_64| 0) 0) (= (select |v_old(#length)_BEFORE_CALL_64| 3) 12) (= (select |v_old(#valid)_BEFORE_CALL_64| 3) 1) (not (= |v_main_~#a~0.base_BEFORE_CALL_76| |#StackHeapBarrier|)) (< (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_76|) (* v_main_~k~0_BEFORE_CALL_82 4)) 0) (not (= (select |v_old(#memory_int)_BEFORE_CALL_64| 1) |v_old(#length)_BEFORE_CALL_64|)) (= 2 (select |v_old(#length)_BEFORE_CALL_64| 1)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_64| 1) |v_old(#valid)_BEFORE_CALL_64|)) (= (select |v_old(#valid)_BEFORE_CALL_64| |v_main_~#a~0.base_BEFORE_CALL_76|) 0) (= (select |v_old(#valid)_BEFORE_CALL_64| 2) 1) (= 26 (select |v_old(#length)_BEFORE_CALL_64| 2)) (not (= |v_main_~#a~0.base_BEFORE_CALL_76| 2)) (not (= |v_main_~#a~0.base_BEFORE_CALL_76| 0)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_64| 1) 0)) (= (select |v_old(#valid)_BEFORE_CALL_64| 1) 1))) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0) (= 100000 ~N~0))' at error location [2023-04-01 09:02:40,588 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:02:40,588 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 09:02:40,588 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 15 [2023-04-01 09:02:40,588 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800852577] [2023-04-01 09:02:40,588 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 09:02:40,589 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-04-01 09:02:40,589 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:02:40,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-04-01 09:02:40,589 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=709, Unknown=0, NotChecked=0, Total=812 [2023-04-01 09:02:40,589 INFO L87 Difference]: Start difference. First operand 56 states and 63 transitions. Second operand has 15 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 15 states have internal predecessors, (41), 8 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2023-04-01 09:02:40,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:02:40,630 INFO L93 Difference]: Finished difference Result 78 states and 87 transitions. [2023-04-01 09:02:40,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-01 09:02:40,631 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 15 states have internal predecessors, (41), 8 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) Word has length 40 [2023-04-01 09:02:40,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:02:40,631 INFO L225 Difference]: With dead ends: 78 [2023-04-01 09:02:40,631 INFO L226 Difference]: Without dead ends: 56 [2023-04-01 09:02:40,632 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 97 SyntacticMatches, 5 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=103, Invalid=709, Unknown=0, NotChecked=0, Total=812 [2023-04-01 09:02:40,632 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 0 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 09:02:40,632 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 85 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 09:02:40,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2023-04-01 09:02:40,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2023-04-01 09:02:40,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 44 states have (on average 1.1590909090909092) internal successors, (51), 45 states have internal predecessors, (51), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-01 09:02:40,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 62 transitions. [2023-04-01 09:02:40,639 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 62 transitions. Word has length 40 [2023-04-01 09:02:40,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:02:40,639 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 62 transitions. [2023-04-01 09:02:40,639 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 15 states have internal predecessors, (41), 8 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2023-04-01 09:02:40,640 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 62 transitions. [2023-04-01 09:02:40,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2023-04-01 09:02:40,640 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:02:40,640 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:02:40,645 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-04-01 09:02:40,844 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-04-01 09:02:40,845 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:02:40,845 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:02:40,845 INFO L85 PathProgramCache]: Analyzing trace with hash 720918667, now seen corresponding path program 7 times [2023-04-01 09:02:40,845 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:02:40,845 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [631051947] [2023-04-01 09:02:40,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:02:40,845 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:02:40,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:02:41,130 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 9 proven. 42 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 09:02:41,130 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:02:41,131 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [631051947] [2023-04-01 09:02:41,131 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [631051947] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 09:02:41,131 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [636858506] [2023-04-01 09:02:41,131 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 09:02:41,131 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:02:41,131 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:02:41,132 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 09:02:41,133 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-04-01 09:02:41,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:02:41,180 INFO L262 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 35 conjunts are in the unsatisfiable core [2023-04-01 09:02:41,182 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:02:41,291 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 09:02:41,533 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 09:02:41,564 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 09:02:41,564 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:02:41,692 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 18 treesize of output 16 [2023-04-01 09:02:41,694 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2023-04-01 09:02:41,827 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 6 proven. 45 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 09:02:41,827 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [636858506] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:02:41,827 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1011221889] [2023-04-01 09:02:41,828 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-04-01 09:02:41,828 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:02:41,828 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:02:41,828 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:02:41,828 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:02:41,847 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 52 for LOIs [2023-04-01 09:02:42,181 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 75 for LOIs [2023-04-01 09:02:42,213 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:02:42,216 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:02:43,280 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4149#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (exists ((|v_main_~#a~0.base_BEFORE_CALL_91| Int) (|v_old(#length)_BEFORE_CALL_73| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_73| (Array Int (Array Int Int))) (v_main_~k~0_BEFORE_CALL_97 Int) (|v_old(#valid)_BEFORE_CALL_73| (Array Int Int))) (and (= (select |v_old(#valid)_BEFORE_CALL_73| 1) 1) (not (= |v_main_~#a~0.base_BEFORE_CALL_91| 2)) (= (select |v_old(#valid)_BEFORE_CALL_73| |v_main_~#a~0.base_BEFORE_CALL_91|) 0) (= (select |v_old(#valid)_BEFORE_CALL_73| 3) 1) (not (= |v_old(#valid)_BEFORE_CALL_73| |v_old(#length)_BEFORE_CALL_73|)) (= (select |v_old(#valid)_BEFORE_CALL_73| 0) 0) (not (= |v_old(#length)_BEFORE_CALL_73| (select |v_old(#memory_int)_BEFORE_CALL_73| 1))) (not (= |v_old(#valid)_BEFORE_CALL_73| (select |v_old(#memory_int)_BEFORE_CALL_73| 1))) (not (= |v_main_~#a~0.base_BEFORE_CALL_91| 3)) (= (select |v_old(#valid)_BEFORE_CALL_73| 2) 1) (= (select |v_old(#length)_BEFORE_CALL_73| 1) 2) (not (= |v_main_~#a~0.base_BEFORE_CALL_91| 0)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_73| 1) 1) 0) (not (= |v_main_~#a~0.base_BEFORE_CALL_91| 1)) (= (select |v_old(#length)_BEFORE_CALL_73| 3) 12) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_73| 1) 0)) (not (= |v_main_~#a~0.base_BEFORE_CALL_91| |#StackHeapBarrier|)) (< (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_91|) (* v_main_~k~0_BEFORE_CALL_97 4)) 0) (= (select |v_old(#length)_BEFORE_CALL_73| 2) 26))) (= |#NULL.base| 0) (= 100000 ~N~0))' at error location [2023-04-01 09:02:43,280 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:02:43,280 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 09:02:43,280 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 15] total 39 [2023-04-01 09:02:43,281 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133420512] [2023-04-01 09:02:43,281 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 09:02:43,281 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2023-04-01 09:02:43,281 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:02:43,282 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2023-04-01 09:02:43,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=2583, Unknown=0, NotChecked=0, Total=2756 [2023-04-01 09:02:43,282 INFO L87 Difference]: Start difference. First operand 56 states and 62 transitions. Second operand has 39 states, 37 states have (on average 2.027027027027027) internal successors, (75), 37 states have internal predecessors, (75), 12 states have call successors, (14), 4 states have call predecessors, (14), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-01 09:02:45,411 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 09:02:45,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:02:45,939 INFO L93 Difference]: Finished difference Result 90 states and 97 transitions. [2023-04-01 09:02:45,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-04-01 09:02:45,940 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 37 states have (on average 2.027027027027027) internal successors, (75), 37 states have internal predecessors, (75), 12 states have call successors, (14), 4 states have call predecessors, (14), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Word has length 44 [2023-04-01 09:02:45,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:02:45,941 INFO L225 Difference]: With dead ends: 90 [2023-04-01 09:02:45,941 INFO L226 Difference]: Without dead ends: 56 [2023-04-01 09:02:45,942 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 90 SyntacticMatches, 5 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1129 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=288, Invalid=3872, Unknown=0, NotChecked=0, Total=4160 [2023-04-01 09:02:45,942 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 35 mSDsluCounter, 288 mSDsCounter, 0 mSdLazyCounter, 756 mSolverCounterSat, 22 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 304 SdHoareTripleChecker+Invalid, 779 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 756 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2023-04-01 09:02:45,942 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 304 Invalid, 779 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 756 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2023-04-01 09:02:45,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2023-04-01 09:02:45,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2023-04-01 09:02:45,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 44 states have (on average 1.1363636363636365) internal successors, (50), 45 states have internal predecessors, (50), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-01 09:02:45,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 61 transitions. [2023-04-01 09:02:45,960 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 61 transitions. Word has length 44 [2023-04-01 09:02:45,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:02:45,960 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 61 transitions. [2023-04-01 09:02:45,960 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 37 states have (on average 2.027027027027027) internal successors, (75), 37 states have internal predecessors, (75), 12 states have call successors, (14), 4 states have call predecessors, (14), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-01 09:02:45,960 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 61 transitions. [2023-04-01 09:02:45,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-04-01 09:02:45,961 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:02:45,961 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:02:45,971 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-04-01 09:02:46,165 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-04-01 09:02:46,165 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:02:46,165 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:02:46,165 INFO L85 PathProgramCache]: Analyzing trace with hash -776043402, now seen corresponding path program 8 times [2023-04-01 09:02:46,165 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:02:46,165 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [52225309] [2023-04-01 09:02:46,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:02:46,166 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:02:46,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:02:46,508 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 6 proven. 57 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 09:02:46,509 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:02:46,509 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [52225309] [2023-04-01 09:02:46,509 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [52225309] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 09:02:46,509 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1893536164] [2023-04-01 09:02:46,509 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 09:02:46,509 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:02:46,509 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:02:46,510 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 09:02:46,512 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-04-01 09:02:46,586 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-04-01 09:02:46,586 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 09:02:46,587 INFO L262 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 43 conjunts are in the unsatisfiable core [2023-04-01 09:02:46,588 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:02:46,748 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 09:02:46,790 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 09:02:46,790 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2023-04-01 09:02:47,213 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 09:02:47,247 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 3 proven. 66 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 09:02:47,247 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:02:47,427 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 25 treesize of output 23 [2023-04-01 09:02:47,430 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 118 treesize of output 110 [2023-04-01 09:02:47,582 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 6 proven. 57 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 09:02:47,582 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1893536164] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:02:47,582 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [415975833] [2023-04-01 09:02:47,583 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-04-01 09:02:47,583 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:02:47,583 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:02:47,583 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:02:47,583 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:02:47,614 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 52 for LOIs [2023-04-01 09:02:47,957 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 75 for LOIs [2023-04-01 09:02:47,989 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:02:47,992 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:02:49,225 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4718#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (exists ((v_main_~k~0_BEFORE_CALL_112 Int) (|v_main_~#a~0.base_BEFORE_CALL_106| Int) (|v_old(#length)_BEFORE_CALL_82| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_82| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_82| (Array Int Int))) (and (not (= |v_main_~#a~0.base_BEFORE_CALL_106| 2)) (= (select |v_old(#valid)_BEFORE_CALL_82| |v_main_~#a~0.base_BEFORE_CALL_106|) 0) (not (= |v_old(#length)_BEFORE_CALL_82| (select |v_old(#memory_int)_BEFORE_CALL_82| 1))) (not (= |v_old(#valid)_BEFORE_CALL_82| |v_old(#length)_BEFORE_CALL_82|)) (= (select |v_old(#valid)_BEFORE_CALL_82| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_82| 2) 1) (= (select (select |v_old(#memory_int)_BEFORE_CALL_82| 1) 1) 0) (not (= |v_old(#valid)_BEFORE_CALL_82| (select |v_old(#memory_int)_BEFORE_CALL_82| 1))) (< (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_106|) (* v_main_~k~0_BEFORE_CALL_112 4)) 0) (= (select |v_old(#length)_BEFORE_CALL_82| 3) 12) (= (select (select |v_old(#memory_int)_BEFORE_CALL_82| 1) 0) 48) (= (select |v_old(#length)_BEFORE_CALL_82| 2) 26) (not (= |v_main_~#a~0.base_BEFORE_CALL_106| 1)) (not (= |v_main_~#a~0.base_BEFORE_CALL_106| |#StackHeapBarrier|)) (= (select |v_old(#valid)_BEFORE_CALL_82| 3) 1) (= 0 (select |v_old(#valid)_BEFORE_CALL_82| 0)) (= 2 (select |v_old(#length)_BEFORE_CALL_82| 1)) (not (= |v_main_~#a~0.base_BEFORE_CALL_106| 0)) (not (= |v_main_~#a~0.base_BEFORE_CALL_106| 3)))) (= |#NULL.offset| 0) (= |#NULL.base| 0) (= 100000 ~N~0))' at error location [2023-04-01 09:02:49,225 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:02:49,226 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 09:02:49,226 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 19, 16] total 44 [2023-04-01 09:02:49,226 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533995853] [2023-04-01 09:02:49,226 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 09:02:49,226 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2023-04-01 09:02:49,226 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:02:49,227 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2023-04-01 09:02:49,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=3108, Unknown=0, NotChecked=0, Total=3306 [2023-04-01 09:02:49,227 INFO L87 Difference]: Start difference. First operand 56 states and 61 transitions. Second operand has 44 states, 42 states have (on average 2.0) internal successors, (84), 42 states have internal predecessors, (84), 12 states have call successors, (14), 4 states have call predecessors, (14), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-01 09:02:51,287 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 09:02:53,362 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 09:02:53,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:02:53,949 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2023-04-01 09:02:53,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-04-01 09:02:53,950 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 42 states have (on average 2.0) internal successors, (84), 42 states have internal predecessors, (84), 12 states have call successors, (14), 4 states have call predecessors, (14), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Word has length 46 [2023-04-01 09:02:53,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:02:53,950 INFO L225 Difference]: With dead ends: 66 [2023-04-01 09:02:53,950 INFO L226 Difference]: Without dead ends: 64 [2023-04-01 09:02:53,951 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 92 SyntacticMatches, 5 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1305 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=346, Invalid=4624, Unknown=0, NotChecked=0, Total=4970 [2023-04-01 09:02:53,951 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 44 mSDsluCounter, 249 mSDsCounter, 0 mSdLazyCounter, 825 mSolverCounterSat, 24 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 263 SdHoareTripleChecker+Invalid, 851 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 825 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2023-04-01 09:02:53,952 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 263 Invalid, 851 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 825 Invalid, 2 Unknown, 0 Unchecked, 4.4s Time] [2023-04-01 09:02:53,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2023-04-01 09:02:53,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2023-04-01 09:02:53,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 49 states have (on average 1.1224489795918366) internal successors, (55), 50 states have internal predecessors, (55), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-01 09:02:53,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 68 transitions. [2023-04-01 09:02:53,959 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 68 transitions. Word has length 46 [2023-04-01 09:02:53,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:02:53,959 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 68 transitions. [2023-04-01 09:02:53,959 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 42 states have (on average 2.0) internal successors, (84), 42 states have internal predecessors, (84), 12 states have call successors, (14), 4 states have call predecessors, (14), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-01 09:02:53,959 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 68 transitions. [2023-04-01 09:02:53,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2023-04-01 09:02:53,960 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:02:53,960 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:02:53,965 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-04-01 09:02:54,160 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-04-01 09:02:54,160 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:02:54,161 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:02:54,161 INFO L85 PathProgramCache]: Analyzing trace with hash -111897344, now seen corresponding path program 9 times [2023-04-01 09:02:54,161 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:02:54,161 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [266657094] [2023-04-01 09:02:54,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:02:54,161 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:02:54,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:02:54,636 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 17 proven. 59 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-04-01 09:02:54,636 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:02:54,637 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [266657094] [2023-04-01 09:02:54,637 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [266657094] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 09:02:54,637 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [515937199] [2023-04-01 09:02:54,637 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 09:02:54,637 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:02:54,637 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:02:54,638 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 09:02:54,639 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-04-01 09:02:54,741 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 09:02:54,741 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 09:02:54,742 INFO L262 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 43 conjunts are in the unsatisfiable core [2023-04-01 09:02:54,744 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:02:54,794 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-04-01 09:02:54,823 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 34 [2023-04-01 09:02:54,850 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 33 [2023-04-01 09:02:54,904 INFO L321 Elim1Store]: treesize reduction 20, result has 47.4 percent of original size [2023-04-01 09:02:54,904 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 39