/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain OctagonDomain -i ../sv-benchmarks/c/array-cav19/array_init_nondet_vars.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 15:15:09,985 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 15:15:09,987 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 15:15:10,016 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 15:15:10,016 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 15:15:10,018 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 15:15:10,021 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 15:15:10,022 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 15:15:10,024 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 15:15:10,027 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 15:15:10,028 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 15:15:10,029 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 15:15:10,030 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 15:15:10,031 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 15:15:10,032 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 15:15:10,035 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 15:15:10,035 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 15:15:10,035 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 15:15:10,037 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 15:15:10,040 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 15:15:10,041 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 15:15:10,042 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 15:15:10,042 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 15:15:10,043 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 15:15:10,049 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-02 15:15:10,049 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-02 15:15:10,049 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-02 15:15:10,050 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-02 15:15:10,051 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-02 15:15:10,051 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-02 15:15:10,051 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 15:15:10,052 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 15:15:10,053 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 15:15:10,053 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 15:15:10,054 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 15:15:10,054 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 15:15:10,054 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 15:15:10,054 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 15:15:10,054 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 15:15:10,055 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 15:15:10,055 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 15:15:10,056 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-02 15:15:10,078 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 15:15:10,079 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 15:15:10,079 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 15:15:10,079 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 15:15:10,080 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 15:15:10,080 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 15:15:10,080 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 15:15:10,080 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 15:15:10,080 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 15:15:10,080 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 15:15:10,081 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 15:15:10,081 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 15:15:10,081 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 15:15:10,081 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 15:15:10,081 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 15:15:10,081 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 15:15:10,082 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 15:15:10,082 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 15:15:10,082 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 15:15:10,082 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 15:15:10,082 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 15:15:10,082 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 15:15:10,082 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 15:15:10,082 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 15:15:10,083 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 15:15:10,083 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 15:15:10,083 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 15:15:10,083 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 15:15:10,083 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 15:15:10,083 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 15:15:10,083 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 15:15:10,083 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 15:15:10,083 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 15:15:10,084 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 15:15:10,084 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 15:15:10,084 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 15:15:10,084 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 15:15:10,084 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 15:15:10,084 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 15:15:10,084 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 15:15:10,084 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 15:15:10,085 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 15:15:10,244 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 15:15:10,257 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 15:15:10,259 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 15:15:10,260 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 15:15:10,260 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 15:15:10,261 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-cav19/array_init_nondet_vars.c [2023-04-02 15:15:11,177 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 15:15:11,343 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 15:15:11,344 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-cav19/array_init_nondet_vars.c [2023-04-02 15:15:11,347 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b58f9490e/8256e446aae249a9ba0b4b0e817ce76c/FLAG5d0d60544 [2023-04-02 15:15:11,356 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b58f9490e/8256e446aae249a9ba0b4b0e817ce76c [2023-04-02 15:15:11,358 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 15:15:11,359 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 15:15:11,360 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 15:15:11,360 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 15:15:11,362 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 15:15:11,362 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 03:15:11" (1/1) ... [2023-04-02 15:15:11,363 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1f6ed96d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:15:11, skipping insertion in model container [2023-04-02 15:15:11,363 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 03:15:11" (1/1) ... [2023-04-02 15:15:11,367 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 15:15:11,376 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 15:15:11,491 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_nondet_vars.c[413,426] [2023-04-02 15:15:11,506 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 15:15:11,517 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 15:15:11,526 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_nondet_vars.c[413,426] [2023-04-02 15:15:11,538 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 15:15:11,549 INFO L208 MainTranslator]: Completed translation [2023-04-02 15:15:11,550 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:15:11 WrapperNode [2023-04-02 15:15:11,550 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 15:15:11,551 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 15:15:11,551 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 15:15:11,551 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 15:15:11,559 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:15:11" (1/1) ... [2023-04-02 15:15:11,560 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:15:11" (1/1) ... [2023-04-02 15:15:11,564 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:15:11" (1/1) ... [2023-04-02 15:15:11,564 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:15:11" (1/1) ... [2023-04-02 15:15:11,575 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:15:11" (1/1) ... [2023-04-02 15:15:11,577 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:15:11" (1/1) ... [2023-04-02 15:15:11,581 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:15:11" (1/1) ... [2023-04-02 15:15:11,582 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:15:11" (1/1) ... [2023-04-02 15:15:11,583 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 15:15:11,584 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 15:15:11,584 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 15:15:11,584 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 15:15:11,584 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:15:11" (1/1) ... [2023-04-02 15:15:11,590 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 15:15:11,599 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:15:11,609 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-02 15:15:11,615 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-02 15:15:11,636 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 15:15:11,636 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 15:15:11,636 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 15:15:11,636 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-02 15:15:11,636 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 15:15:11,637 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 15:15:11,637 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 15:15:11,637 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 15:15:11,637 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 15:15:11,637 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 15:15:11,637 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-02 15:15:11,637 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 15:15:11,637 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-02 15:15:11,637 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 15:15:11,637 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-02 15:15:11,637 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 15:15:11,637 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 15:15:11,638 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 15:15:11,638 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 15:15:11,638 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 15:15:11,638 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 15:15:11,681 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 15:15:11,682 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 15:15:11,802 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 15:15:11,831 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 15:15:11,832 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-04-02 15:15:11,833 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 03:15:11 BoogieIcfgContainer [2023-04-02 15:15:11,833 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 15:15:11,849 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 15:15:11,849 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 15:15:11,859 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 15:15:11,859 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 03:15:11" (1/3) ... [2023-04-02 15:15:11,859 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ee273ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 03:15:11, skipping insertion in model container [2023-04-02 15:15:11,859 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:15:11" (2/3) ... [2023-04-02 15:15:11,860 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ee273ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 03:15:11, skipping insertion in model container [2023-04-02 15:15:11,860 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 03:15:11" (3/3) ... [2023-04-02 15:15:11,861 INFO L112 eAbstractionObserver]: Analyzing ICFG array_init_nondet_vars.c [2023-04-02 15:15:11,872 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 15:15:11,872 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 15:15:11,903 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 15:15:11,908 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;@7167901d, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 15:15:11,908 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 15:15:11,911 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 15 states have internal predecessors, (18), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-02 15:15:11,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-04-02 15:15:11,916 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:15:11,916 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:15:11,916 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:15:11,920 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:15:11,920 INFO L85 PathProgramCache]: Analyzing trace with hash 1466193338, now seen corresponding path program 1 times [2023-04-02 15:15:11,926 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:15:11,927 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2146892513] [2023-04-02 15:15:11,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:15:11,927 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:15:12,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:15:12,167 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 15:15:12,168 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:15:12,168 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2146892513] [2023-04-02 15:15:12,168 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2146892513] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 15:15:12,168 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 15:15:12,169 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-02 15:15:12,170 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630393000] [2023-04-02 15:15:12,170 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 15:15:12,174 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-02 15:15:12,174 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:15:12,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-02 15:15:12,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-02 15:15:12,192 INFO L87 Difference]: Start difference. First operand has 26 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 15 states have internal predecessors, (18), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-04-02 15:15:12,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:15:12,270 INFO L93 Difference]: Finished difference Result 46 states and 58 transitions. [2023-04-02 15:15:12,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-02 15:15:12,271 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 19 [2023-04-02 15:15:12,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:15:12,276 INFO L225 Difference]: With dead ends: 46 [2023-04-02 15:15:12,276 INFO L226 Difference]: Without dead ends: 29 [2023-04-02 15:15:12,278 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 [2023-04-02 15:15:12,280 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 3 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:15:12,281 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 53 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:15:12,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-04-02 15:15:12,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 24. [2023-04-02 15:15:12,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-02 15:15:12,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2023-04-02 15:15:12,312 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 19 [2023-04-02 15:15:12,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:15:12,312 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2023-04-02 15:15:12,312 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-04-02 15:15:12,313 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2023-04-02 15:15:12,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-04-02 15:15:12,313 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:15:12,314 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:15:12,314 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 15:15:12,321 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:15:12,322 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:15:12,322 INFO L85 PathProgramCache]: Analyzing trace with hash -1125615595, now seen corresponding path program 1 times [2023-04-02 15:15:12,322 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:15:12,322 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1343551987] [2023-04-02 15:15:12,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:15:12,323 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:15:12,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:15:12,777 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 15:15:12,778 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:15:12,778 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1343551987] [2023-04-02 15:15:12,778 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1343551987] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:15:12,779 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [8752174] [2023-04-02 15:15:12,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:15:12,779 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:15:12,779 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:15:12,781 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:15:12,783 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-02 15:15:12,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:15:12,842 INFO L262 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 26 conjunts are in the unsatisfiable core [2023-04-02 15:15:12,847 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:15:13,027 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 15:15:13,081 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 [2023-04-02 15:15:13,110 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 15:15:13,110 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:15:13,167 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 [2023-04-02 15:15:13,171 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 [2023-04-02 15:15:13,272 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 15:15:13,273 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [8752174] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:15:13,273 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1480097068] [2023-04-02 15:15:13,291 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-04-02 15:15:13,291 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:15:13,295 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:15:13,298 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:15:13,302 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:15:13,349 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:15:13,754 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 15:15:13,772 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:15:13,774 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:15:13,778 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:15:14,712 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '298#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_main_~#a~0.base_BEFORE_CALL_10| Int)) (and (<= 3 (+ |v_main_~#a~0.base_BEFORE_CALL_10| |#StackHeapBarrier|)) (< (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_10|) 4) 3) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a~0.base_BEFORE_CALL_10|) (<= 2 |v_main_~#a~0.base_BEFORE_CALL_10|))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:15:14,712 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:15:14,712 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:15:14,713 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 11] total 21 [2023-04-02 15:15:14,713 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600269180] [2023-04-02 15:15:14,713 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:15:14,714 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-04-02 15:15:14,714 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:15:14,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-04-02 15:15:14,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=1241, Unknown=6, NotChecked=0, Total=1406 [2023-04-02 15:15:14,717 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 21 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 15 states have internal predecessors, (23), 6 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2023-04-02 15:15:14,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:15:14,888 INFO L93 Difference]: Finished difference Result 44 states and 52 transitions. [2023-04-02 15:15:14,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-04-02 15:15:14,889 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 15 states have internal predecessors, (23), 6 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) Word has length 24 [2023-04-02 15:15:14,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:15:14,890 INFO L225 Difference]: With dead ends: 44 [2023-04-02 15:15:14,890 INFO L226 Difference]: Without dead ends: 42 [2023-04-02 15:15:14,891 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 44 SyntacticMatches, 3 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 367 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=201, Invalid=1515, Unknown=6, NotChecked=0, Total=1722 [2023-04-02 15:15:14,892 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 58 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 212 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 240 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 212 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:15:14,894 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 137 Invalid, 240 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 212 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:15:14,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2023-04-02 15:15:14,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 33. [2023-04-02 15:15:14,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 20 states have (on average 1.15) internal successors, (23), 21 states have internal predecessors, (23), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2023-04-02 15:15:14,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2023-04-02 15:15:14,901 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 24 [2023-04-02 15:15:14,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:15:14,901 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2023-04-02 15:15:14,902 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 15 states have internal predecessors, (23), 6 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2023-04-02 15:15:14,902 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2023-04-02 15:15:14,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-04-02 15:15:14,902 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:15:14,902 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:15:14,912 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-02 15:15:15,107 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:15:15,108 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:15:15,108 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:15:15,108 INFO L85 PathProgramCache]: Analyzing trace with hash -906848614, now seen corresponding path program 2 times [2023-04-02 15:15:15,108 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:15:15,109 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1143214918] [2023-04-02 15:15:15,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:15:15,109 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:15:15,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:15:15,395 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-02 15:15:15,396 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:15:15,396 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1143214918] [2023-04-02 15:15:15,396 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1143214918] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:15:15,396 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [67966140] [2023-04-02 15:15:15,396 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:15:15,397 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:15:15,397 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:15:15,398 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:15:15,400 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-02 15:15:15,445 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-02 15:15:15,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:15:15,446 INFO L262 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 35 conjunts are in the unsatisfiable core [2023-04-02 15:15:15,449 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:15:15,542 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 [2023-04-02 15:15:15,609 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 23 treesize of output 22 [2023-04-02 15:15:15,633 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 [2023-04-02 15:15:15,658 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 15:15:15,658 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:15:15,736 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [67966140] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:15:15,737 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1520065185] [2023-04-02 15:15:15,738 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-04-02 15:15:15,738 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:15:15,738 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:15:15,739 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:15:15,739 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:15:15,752 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:15:15,975 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 15:15:15,983 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:15:15,983 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:15:15,986 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:15:18,103 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '574#(and (exists ((|v_main_~#a~0.base_BEFORE_CALL_22| Int)) (and (<= 2 |v_main_~#a~0.base_BEFORE_CALL_22|) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a~0.base_BEFORE_CALL_22|) (< (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_22|) 4) 3) (<= 3 (+ |v_main_~#a~0.base_BEFORE_CALL_22| |#StackHeapBarrier|)))) (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:15:18,104 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:15:18,104 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:15:18,104 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 14] total 21 [2023-04-02 15:15:18,104 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2011553003] [2023-04-02 15:15:18,104 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:15:18,104 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-04-02 15:15:18,104 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:15:18,105 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-04-02 15:15:18,105 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=1530, Unknown=7, NotChecked=0, Total=1722 [2023-04-02 15:15:18,106 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand has 21 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 15 states have internal predecessors, (25), 7 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (9), 8 states have call predecessors, (9), 6 states have call successors, (9) [2023-04-02 15:15:22,126 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] [2023-04-02 15:15:24,144 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] [2023-04-02 15:15:24,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:15:24,155 INFO L93 Difference]: Finished difference Result 70 states and 82 transitions. [2023-04-02 15:15:24,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-04-02 15:15:24,156 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 15 states have internal predecessors, (25), 7 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (9), 8 states have call predecessors, (9), 6 states have call successors, (9) Word has length 29 [2023-04-02 15:15:24,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:15:24,158 INFO L225 Difference]: With dead ends: 70 [2023-04-02 15:15:24,158 INFO L226 Difference]: Without dead ends: 68 [2023-04-02 15:15:24,159 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 780 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=320, Invalid=2642, Unknown=8, NotChecked=0, Total=2970 [2023-04-02 15:15:24,159 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 80 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 301 mSolverCounterSat, 49 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 352 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 301 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2023-04-02 15:15:24,160 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 104 Invalid, 352 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 301 Invalid, 2 Unknown, 0 Unchecked, 4.2s Time] [2023-04-02 15:15:24,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2023-04-02 15:15:24,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 42. [2023-04-02 15:15:24,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 25 states have (on average 1.2) internal successors, (30), 27 states have internal predecessors, (30), 11 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 8 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-02 15:15:24,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 51 transitions. [2023-04-02 15:15:24,178 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 51 transitions. Word has length 29 [2023-04-02 15:15:24,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:15:24,178 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 51 transitions. [2023-04-02 15:15:24,178 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 15 states have internal predecessors, (25), 7 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (9), 8 states have call predecessors, (9), 6 states have call successors, (9) [2023-04-02 15:15:24,183 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 51 transitions. [2023-04-02 15:15:24,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-04-02 15:15:24,183 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:15:24,183 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:15:24,188 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-02 15:15:24,384 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-04-02 15:15:24,384 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:15:24,385 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:15:24,385 INFO L85 PathProgramCache]: Analyzing trace with hash -1659364099, now seen corresponding path program 1 times [2023-04-02 15:15:24,385 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:15:24,385 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2038978683] [2023-04-02 15:15:24,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:15:24,385 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:15:24,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:15:24,430 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 15:15:24,431 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:15:24,432 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2038978683] [2023-04-02 15:15:24,432 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2038978683] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:15:24,433 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1591991996] [2023-04-02 15:15:24,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:15:24,433 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:15:24,433 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:15:24,434 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:15:24,436 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-02 15:15:24,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:15:24,479 INFO L262 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-02 15:15:24,482 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:15:24,514 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 15:15:24,514 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:15:24,551 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 15:15:24,551 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1591991996] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:15:24,551 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [521006941] [2023-04-02 15:15:24,554 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-04-02 15:15:24,554 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:15:24,554 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:15:24,555 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:15:24,555 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:15:24,573 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:15:25,011 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 15:15:25,023 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:15:25,024 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:15:25,026 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:15:26,001 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '982#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:15:26,002 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:15:26,002 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:15:26,002 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2023-04-02 15:15:26,002 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992264480] [2023-04-02 15:15:26,002 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:15:26,002 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-04-02 15:15:26,002 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:15:26,003 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-04-02 15:15:26,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=690, Unknown=7, NotChecked=0, Total=812 [2023-04-02 15:15:26,003 INFO L87 Difference]: Start difference. First operand 42 states and 51 transitions. Second operand has 10 states, 10 states have (on average 2.7) internal successors, (27), 10 states have internal predecessors, (27), 7 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2023-04-02 15:15:26,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:15:26,061 INFO L93 Difference]: Finished difference Result 61 states and 73 transitions. [2023-04-02 15:15:26,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-02 15:15:26,062 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 10 states have internal predecessors, (27), 7 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 31 [2023-04-02 15:15:26,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:15:26,062 INFO L225 Difference]: With dead ends: 61 [2023-04-02 15:15:26,062 INFO L226 Difference]: Without dead ends: 48 [2023-04-02 15:15:26,063 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 69 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 241 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=122, Invalid=741, Unknown=7, NotChecked=0, Total=870 [2023-04-02 15:15:26,063 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 3 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 15:15:26,064 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 73 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 15:15:26,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2023-04-02 15:15:26,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 42. [2023-04-02 15:15:26,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 25 states have (on average 1.16) internal successors, (29), 27 states have internal predecessors, (29), 11 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 8 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-02 15:15:26,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2023-04-02 15:15:26,069 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 31 [2023-04-02 15:15:26,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:15:26,069 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2023-04-02 15:15:26,070 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 10 states have internal predecessors, (27), 7 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2023-04-02 15:15:26,070 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2023-04-02 15:15:26,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-04-02 15:15:26,070 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:15:26,070 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:15:26,075 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-02 15:15:26,279 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:15:26,279 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:15:26,280 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:15:26,280 INFO L85 PathProgramCache]: Analyzing trace with hash 202149592, now seen corresponding path program 2 times [2023-04-02 15:15:26,280 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:15:26,280 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1961825343] [2023-04-02 15:15:26,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:15:26,280 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:15:26,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:15:26,533 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-02 15:15:26,534 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:15:26,534 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1961825343] [2023-04-02 15:15:26,534 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1961825343] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:15:26,534 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [240487901] [2023-04-02 15:15:26,534 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:15:26,534 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:15:26,534 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:15:26,535 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:15:26,537 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-02 15:15:26,580 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-02 15:15:26,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:15:26,581 INFO L262 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 36 conjunts are in the unsatisfiable core [2023-04-02 15:15:26,582 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:15:26,703 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 [2023-04-02 15:15:26,813 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 [2023-04-02 15:15:26,853 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 11 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-02 15:15:26,853 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:15:26,941 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 [2023-04-02 15:15:26,944 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 [2023-04-02 15:15:27,103 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-02 15:15:27,103 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [240487901] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:15:27,103 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [10293073] [2023-04-02 15:15:27,104 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-04-02 15:15:27,105 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:15:27,105 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:15:27,105 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:15:27,105 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:15:27,115 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:15:27,543 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 15:15:27,553 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:15:27,554 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:15:27,557 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:15:30,894 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1409#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:15:30,894 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:15:30,894 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:15:30,895 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15, 13] total 32 [2023-04-02 15:15:30,895 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625644911] [2023-04-02 15:15:30,895 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:15:30,895 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-04-02 15:15:30,895 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:15:30,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-04-02 15:15:30,897 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=268, Invalid=2274, Unknown=8, NotChecked=0, Total=2550 [2023-04-02 15:15:30,897 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand has 32 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 24 states have internal predecessors, (44), 13 states have call successors, (16), 4 states have call predecessors, (16), 3 states have return successors, (15), 14 states have call predecessors, (15), 11 states have call successors, (15) [2023-04-02 15:15:35,054 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] [2023-04-02 15:15:37,349 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:15:39,379 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:15:41,412 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] [2023-04-02 15:15:41,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:15:41,487 INFO L93 Difference]: Finished difference Result 81 states and 92 transitions. [2023-04-02 15:15:41,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-04-02 15:15:41,488 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 24 states have internal predecessors, (44), 13 states have call successors, (16), 4 states have call predecessors, (16), 3 states have return successors, (15), 14 states have call predecessors, (15), 11 states have call successors, (15) Word has length 36 [2023-04-02 15:15:41,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:15:41,488 INFO L225 Difference]: With dead ends: 81 [2023-04-02 15:15:41,488 INFO L226 Difference]: Without dead ends: 79 [2023-04-02 15:15:41,490 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1327 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=509, Invalid=4038, Unknown=9, NotChecked=0, Total=4556 [2023-04-02 15:15:41,490 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 71 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 521 mSolverCounterSat, 57 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 268 SdHoareTripleChecker+Invalid, 582 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 521 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.3s IncrementalHoareTripleChecker+Time [2023-04-02 15:15:41,490 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [74 Valid, 268 Invalid, 582 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 521 Invalid, 4 Unknown, 0 Unchecked, 8.3s Time] [2023-04-02 15:15:41,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2023-04-02 15:15:41,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 63. [2023-04-02 15:15:41,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 42 states have internal predecessors, (43), 15 states have call successors, (15), 9 states have call predecessors, (15), 8 states have return successors, (14), 11 states have call predecessors, (14), 14 states have call successors, (14) [2023-04-02 15:15:41,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 72 transitions. [2023-04-02 15:15:41,499 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 72 transitions. Word has length 36 [2023-04-02 15:15:41,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:15:41,499 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 72 transitions. [2023-04-02 15:15:41,499 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 24 states have internal predecessors, (44), 13 states have call successors, (16), 4 states have call predecessors, (16), 3 states have return successors, (15), 14 states have call predecessors, (15), 11 states have call successors, (15) [2023-04-02 15:15:41,499 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 72 transitions. [2023-04-02 15:15:41,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-04-02 15:15:41,500 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:15:41,500 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:15:41,509 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-04-02 15:15:41,705 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:15:41,705 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:15:41,706 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:15:41,706 INFO L85 PathProgramCache]: Analyzing trace with hash 1473068922, now seen corresponding path program 3 times [2023-04-02 15:15:41,706 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:15:41,706 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [102234312] [2023-04-02 15:15:41,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:15:41,706 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:15:41,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:15:42,070 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 5 proven. 25 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-04-02 15:15:42,070 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:15:42,070 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [102234312] [2023-04-02 15:15:42,070 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [102234312] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:15:42,070 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [515175617] [2023-04-02 15:15:42,070 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:15:42,071 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:15:42,071 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:15:42,072 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:15:42,077 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-02 15:15:42,119 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:15:42,119 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:15:42,120 INFO L262 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 43 conjunts are in the unsatisfiable core [2023-04-02 15:15:42,123 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:15:42,203 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 15:15:42,260 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 19 treesize of output 18 [2023-04-02 15:15:42,319 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 19 treesize of output 18 [2023-04-02 15:15:42,396 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 19 treesize of output 18 [2023-04-02 15:15:42,437 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 [2023-04-02 15:15:42,466 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 18 proven. 26 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-02 15:15:42,466 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:15:44,575 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [515175617] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:15:44,575 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1377644821] [2023-04-02 15:15:44,576 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-04-02 15:15:44,576 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:15:44,577 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:15:44,577 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:15:44,577 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:15:44,589 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:15:44,762 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 15:15:44,768 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:15:44,769 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:15:44,771 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:15:47,650 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1867#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_main_~#a~0.base_BEFORE_CALL_73| Int)) (and (<= (+ |#StackHeapBarrier| 1) |v_main_~#a~0.base_BEFORE_CALL_73|) (< (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_73|) 4) 3) (<= 2 |v_main_~#a~0.base_BEFORE_CALL_73|) (<= 3 (+ |v_main_~#a~0.base_BEFORE_CALL_73| |#StackHeapBarrier|)))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:15:47,650 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:15:47,650 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:15:47,650 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 27 [2023-04-02 15:15:47,650 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915871837] [2023-04-02 15:15:47,650 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:15:47,651 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-04-02 15:15:47,651 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:15:47,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-04-02 15:15:47,652 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=1940, Unknown=8, NotChecked=0, Total=2162 [2023-04-02 15:15:47,652 INFO L87 Difference]: Start difference. First operand 63 states and 72 transitions. Second operand has 27 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 21 states have internal predecessors, (35), 11 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (12), 11 states have call predecessors, (12), 10 states have call successors, (12) [2023-04-02 15:15:48,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:15:48,054 INFO L93 Difference]: Finished difference Result 84 states and 95 transitions. [2023-04-02 15:15:48,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-04-02 15:15:48,055 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 21 states have internal predecessors, (35), 11 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (12), 11 states have call predecessors, (12), 10 states have call successors, (12) Word has length 39 [2023-04-02 15:15:48,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:15:48,056 INFO L225 Difference]: With dead ends: 84 [2023-04-02 15:15:48,056 INFO L226 Difference]: Without dead ends: 82 [2023-04-02 15:15:48,056 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 53 SyntacticMatches, 7 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 936 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=313, Invalid=2759, Unknown=8, NotChecked=0, Total=3080 [2023-04-02 15:15:48,057 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 95 mSDsluCounter, 145 mSDsCounter, 0 mSdLazyCounter, 546 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 164 SdHoareTripleChecker+Invalid, 606 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 546 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 15:15:48,057 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [95 Valid, 164 Invalid, 606 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 546 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 15:15:48,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2023-04-02 15:15:48,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 65. [2023-04-02 15:15:48,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 40 states have (on average 1.1) internal successors, (44), 43 states have internal predecessors, (44), 15 states have call successors, (15), 10 states have call predecessors, (15), 9 states have return successors, (14), 11 states have call predecessors, (14), 14 states have call successors, (14) [2023-04-02 15:15:48,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 73 transitions. [2023-04-02 15:15:48,067 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 73 transitions. Word has length 39 [2023-04-02 15:15:48,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:15:48,067 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 73 transitions. [2023-04-02 15:15:48,067 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 21 states have internal predecessors, (35), 11 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (12), 11 states have call predecessors, (12), 10 states have call successors, (12) [2023-04-02 15:15:48,067 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 73 transitions. [2023-04-02 15:15:48,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-04-02 15:15:48,068 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:15:48,068 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:15:48,075 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-04-02 15:15:48,273 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:15:48,275 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:15:48,276 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:15:48,276 INFO L85 PathProgramCache]: Analyzing trace with hash 518786525, now seen corresponding path program 3 times [2023-04-02 15:15:48,276 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:15:48,276 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1734979244] [2023-04-02 15:15:48,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:15:48,276 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:15:48,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:15:48,528 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 5 proven. 17 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-04-02 15:15:48,528 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:15:48,528 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1734979244] [2023-04-02 15:15:48,528 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1734979244] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:15:48,528 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1015453993] [2023-04-02 15:15:48,528 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:15:48,528 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:15:48,529 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:15:48,529 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:15:48,531 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-02 15:15:48,573 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:15:48,573 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:15:48,574 INFO L262 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 39 conjunts are in the unsatisfiable core [2023-04-02 15:15:48,576 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:15:48,692 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 15:15:48,753 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 19 treesize of output 18 [2023-04-02 15:15:48,854 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 [2023-04-02 15:15:48,898 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 8 proven. 19 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-02 15:15:48,898 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:15:48,954 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 [2023-04-02 15:15:48,956 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 [2023-04-02 15:15:49,040 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 5 proven. 17 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-04-02 15:15:49,041 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1015453993] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:15:49,041 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [138318477] [2023-04-02 15:15:49,042 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-04-02 15:15:49,042 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:15:49,042 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:15:49,042 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:15:49,042 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:15:49,052 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:15:49,384 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 15:15:49,395 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:15:49,396 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:15:49,397 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:15:51,161 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2403#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:15:51,161 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:15:51,161 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:15:51,162 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 16, 14] total 28 [2023-04-02 15:15:51,162 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1696808110] [2023-04-02 15:15:51,162 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:15:51,162 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-04-02 15:15:51,162 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:15:51,163 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-04-02 15:15:51,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=1943, Unknown=8, NotChecked=0, Total=2162 [2023-04-02 15:15:51,163 INFO L87 Difference]: Start difference. First operand 65 states and 73 transitions. Second operand has 28 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 22 states have internal predecessors, (43), 13 states have call successors, (16), 4 states have call predecessors, (16), 3 states have return successors, (13), 12 states have call predecessors, (13), 11 states have call successors, (13) [2023-04-02 15:15:53,229 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] [2023-04-02 15:15:55,473 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:15:57,503 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:15:57,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:15:57,546 INFO L93 Difference]: Finished difference Result 112 states and 122 transitions. [2023-04-02 15:15:57,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-04-02 15:15:57,547 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 22 states have internal predecessors, (43), 13 states have call successors, (16), 4 states have call predecessors, (16), 3 states have return successors, (13), 12 states have call predecessors, (13), 11 states have call successors, (13) Word has length 41 [2023-04-02 15:15:57,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:15:57,548 INFO L225 Difference]: With dead ends: 112 [2023-04-02 15:15:57,548 INFO L226 Difference]: Without dead ends: 110 [2023-04-02 15:15:57,549 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 84 SyntacticMatches, 8 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 903 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=308, Invalid=2876, Unknown=8, NotChecked=0, Total=3192 [2023-04-02 15:15:57,549 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 84 mSDsluCounter, 208 mSDsCounter, 0 mSdLazyCounter, 469 mSolverCounterSat, 62 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 228 SdHoareTripleChecker+Invalid, 534 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 469 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.2s IncrementalHoareTripleChecker+Time [2023-04-02 15:15:57,549 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 228 Invalid, 534 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 469 Invalid, 3 Unknown, 0 Unchecked, 6.2s Time] [2023-04-02 15:15:57,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2023-04-02 15:15:57,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 80. [2023-04-02 15:15:57,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 51 states have (on average 1.0980392156862746) internal successors, (56), 53 states have internal predecessors, (56), 16 states have call successors, (16), 13 states have call predecessors, (16), 12 states have return successors, (15), 13 states have call predecessors, (15), 15 states have call successors, (15) [2023-04-02 15:15:57,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 87 transitions. [2023-04-02 15:15:57,560 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 87 transitions. Word has length 41 [2023-04-02 15:15:57,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:15:57,560 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 87 transitions. [2023-04-02 15:15:57,560 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 22 states have internal predecessors, (43), 13 states have call successors, (16), 4 states have call predecessors, (16), 3 states have return successors, (13), 12 states have call predecessors, (13), 11 states have call successors, (13) [2023-04-02 15:15:57,560 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 87 transitions. [2023-04-02 15:15:57,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-04-02 15:15:57,561 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:15:57,561 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:15:57,568 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-04-02 15:15:57,765 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:15:57,766 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:15:57,766 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:15:57,766 INFO L85 PathProgramCache]: Analyzing trace with hash -1195510219, now seen corresponding path program 4 times [2023-04-02 15:15:57,766 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:15:57,766 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [621784487] [2023-04-02 15:15:57,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:15:57,766 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:15:57,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:15:58,120 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 8 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-04-02 15:15:58,121 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:15:58,121 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [621784487] [2023-04-02 15:15:58,121 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [621784487] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:15:58,121 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1689876201] [2023-04-02 15:15:58,121 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 15:15:58,121 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:15:58,121 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:15:58,123 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:15:58,125 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-02 15:15:58,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:15:58,171 INFO L262 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 39 conjunts are in the unsatisfiable core [2023-04-02 15:15:58,173 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:15:58,309 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 15:15:58,449 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 15:15:58,450 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 15:15:58,451 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 [2023-04-02 15:15:58,500 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-02 15:15:58,500 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:15:58,604 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 [2023-04-02 15:15:58,607 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 [2023-04-02 15:15:58,744 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 8 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-04-02 15:15:58,744 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1689876201] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:15:58,744 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [870359697] [2023-04-02 15:15:58,745 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-04-02 15:15:58,745 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:15:58,746 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:15:58,746 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:15:58,746 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:15:58,756 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:15:59,104 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 15:15:59,114 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:15:59,115 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:15:59,116 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:16:02,467 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3053#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:16:02,467 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:16:02,468 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:16:02,468 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 19, 15] total 36 [2023-04-02 15:16:02,468 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387710208] [2023-04-02 15:16:02,468 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:16:02,468 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-04-02 15:16:02,468 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:16:02,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-04-02 15:16:02,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=262, Invalid=2700, Unknown=8, NotChecked=0, Total=2970 [2023-04-02 15:16:02,470 INFO L87 Difference]: Start difference. First operand 80 states and 87 transitions. Second operand has 36 states, 32 states have (on average 1.6875) internal successors, (54), 28 states have internal predecessors, (54), 17 states have call successors, (22), 4 states have call predecessors, (22), 4 states have return successors, (20), 17 states have call predecessors, (20), 15 states have call successors, (20) [2023-04-02 15:16:04,878 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] [2023-04-02 15:16:05,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:16:05,392 INFO L93 Difference]: Finished difference Result 121 states and 131 transitions. [2023-04-02 15:16:05,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-04-02 15:16:05,393 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 32 states have (on average 1.6875) internal successors, (54), 28 states have internal predecessors, (54), 17 states have call successors, (22), 4 states have call predecessors, (22), 4 states have return successors, (20), 17 states have call predecessors, (20), 15 states have call successors, (20) Word has length 48 [2023-04-02 15:16:05,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:16:05,393 INFO L225 Difference]: With dead ends: 121 [2023-04-02 15:16:05,393 INFO L226 Difference]: Without dead ends: 119 [2023-04-02 15:16:05,395 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 102 SyntacticMatches, 5 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1378 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=410, Invalid=4004, Unknown=8, NotChecked=0, Total=4422 [2023-04-02 15:16:05,395 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 53 mSDsluCounter, 368 mSDsCounter, 0 mSdLazyCounter, 892 mSolverCounterSat, 41 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 399 SdHoareTripleChecker+Invalid, 934 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 892 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2023-04-02 15:16:05,395 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 399 Invalid, 934 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 892 Invalid, 1 Unknown, 0 Unchecked, 2.7s Time] [2023-04-02 15:16:05,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2023-04-02 15:16:05,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 87. [2023-04-02 15:16:05,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 56 states have (on average 1.0892857142857142) internal successors, (61), 58 states have internal predecessors, (61), 17 states have call successors, (17), 14 states have call predecessors, (17), 13 states have return successors, (16), 14 states have call predecessors, (16), 16 states have call successors, (16) [2023-04-02 15:16:05,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 94 transitions. [2023-04-02 15:16:05,408 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 94 transitions. Word has length 48 [2023-04-02 15:16:05,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:16:05,408 INFO L495 AbstractCegarLoop]: Abstraction has 87 states and 94 transitions. [2023-04-02 15:16:05,408 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 32 states have (on average 1.6875) internal successors, (54), 28 states have internal predecessors, (54), 17 states have call successors, (22), 4 states have call predecessors, (22), 4 states have return successors, (20), 17 states have call predecessors, (20), 15 states have call successors, (20) [2023-04-02 15:16:05,408 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 94 transitions. [2023-04-02 15:16:05,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2023-04-02 15:16:05,409 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:16:05,409 INFO L195 NwaCegarLoop]: trace histogram [7, 5, 5, 5, 5, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:16:05,417 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-04-02 15:16:05,617 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:16:05,617 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:16:05,618 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:16:05,618 INFO L85 PathProgramCache]: Analyzing trace with hash 1689282237, now seen corresponding path program 5 times [2023-04-02 15:16:05,618 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:16:05,618 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1194976372] [2023-04-02 15:16:05,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:16:05,618 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:16:05,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:16:05,976 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 41 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-04-02 15:16:05,977 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:16:05,977 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1194976372] [2023-04-02 15:16:05,977 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1194976372] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:16:05,977 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [331412974] [2023-04-02 15:16:05,977 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:16:05,977 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:16:05,977 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:16:05,978 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) [2023-04-02 15:16:05,980 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-04-02 15:16:06,050 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-04-02 15:16:06,051 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:16:06,052 INFO L262 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 39 conjunts are in the unsatisfiable core [2023-04-02 15:16:06,054 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:16:06,162 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 15:16:06,226 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:16:06,227 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 [2023-04-02 15:16:06,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:16:06,293 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 [2023-04-02 15:16:06,361 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:16:06,362 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 [2023-04-02 15:16:06,465 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 [2023-04-02 15:16:06,513 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 30 proven. 37 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-04-02 15:16:06,513 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:16:06,619 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 20 treesize of output 18 [2023-04-02 15:16:06,621 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 [2023-04-02 15:16:06,702 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 5 proven. 41 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2023-04-02 15:16:06,702 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [331412974] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:16:06,703 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [418597605] [2023-04-02 15:16:06,704 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-04-02 15:16:06,704 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:16:06,704 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:16:06,704 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:16:06,704 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:16:06,716 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:16:07,085 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 15:16:07,096 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:16:07,096 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:16:07,098 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:16:08,972 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3744#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:16:08,972 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:16:08,972 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:16:08,972 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 18, 15] total 32 [2023-04-02 15:16:08,972 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153614334] [2023-04-02 15:16:08,972 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:16:08,973 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-04-02 15:16:08,973 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:16:08,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-04-02 15:16:08,974 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=2300, Unknown=8, NotChecked=0, Total=2550 [2023-04-02 15:16:08,974 INFO L87 Difference]: Start difference. First operand 87 states and 94 transitions. Second operand has 32 states, 28 states have (on average 1.8928571428571428) internal successors, (53), 26 states have internal predecessors, (53), 17 states have call successors, (20), 4 states have call predecessors, (20), 3 states have return successors, (17), 16 states have call predecessors, (17), 15 states have call successors, (17) [2023-04-02 15:16:09,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:16:09,395 INFO L93 Difference]: Finished difference Result 118 states and 128 transitions. [2023-04-02 15:16:09,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-04-02 15:16:09,396 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 28 states have (on average 1.8928571428571428) internal successors, (53), 26 states have internal predecessors, (53), 17 states have call successors, (20), 4 states have call predecessors, (20), 3 states have return successors, (17), 16 states have call predecessors, (17), 15 states have call successors, (17) Word has length 51 [2023-04-02 15:16:09,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:16:09,397 INFO L225 Difference]: With dead ends: 118 [2023-04-02 15:16:09,397 INFO L226 Difference]: Without dead ends: 116 [2023-04-02 15:16:09,398 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 106 SyntacticMatches, 14 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1184 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=346, Invalid=3306, Unknown=8, NotChecked=0, Total=3660 [2023-04-02 15:16:09,398 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 30 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 733 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 286 SdHoareTripleChecker+Invalid, 762 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 733 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 15:16:09,398 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 286 Invalid, 762 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 733 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 15:16:09,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2023-04-02 15:16:09,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 102. [2023-04-02 15:16:09,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 66 states have (on average 1.0757575757575757) internal successors, (71), 70 states have internal predecessors, (71), 20 states have call successors, (20), 16 states have call predecessors, (20), 15 states have return successors, (19), 15 states have call predecessors, (19), 19 states have call successors, (19) [2023-04-02 15:16:09,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 110 transitions. [2023-04-02 15:16:09,411 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 110 transitions. Word has length 51 [2023-04-02 15:16:09,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:16:09,411 INFO L495 AbstractCegarLoop]: Abstraction has 102 states and 110 transitions. [2023-04-02 15:16:09,412 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 28 states have (on average 1.8928571428571428) internal successors, (53), 26 states have internal predecessors, (53), 17 states have call successors, (20), 4 states have call predecessors, (20), 3 states have return successors, (17), 16 states have call predecessors, (17), 15 states have call successors, (17) [2023-04-02 15:16:09,412 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 110 transitions. [2023-04-02 15:16:09,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2023-04-02 15:16:09,413 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:16:09,413 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:16:09,417 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-04-02 15:16:09,617 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,SelfDestructingSolverStorable8 [2023-04-02 15:16:09,618 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:16:09,618 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:16:09,618 INFO L85 PathProgramCache]: Analyzing trace with hash 501618106, now seen corresponding path program 6 times [2023-04-02 15:16:09,618 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:16:09,618 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [904676501] [2023-04-02 15:16:09,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:16:09,618 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:16:09,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:16:09,971 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 8 proven. 33 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-04-02 15:16:09,971 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:16:09,971 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [904676501] [2023-04-02 15:16:09,972 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [904676501] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:16:09,972 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [154657507] [2023-04-02 15:16:09,972 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:16:09,972 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:16:09,972 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:16:09,973 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) [2023-04-02 15:16:09,975 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-04-02 15:16:10,024 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:16:10,025 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:16:10,026 INFO L262 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 43 conjunts are in the unsatisfiable core [2023-04-02 15:16:10,027 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:16:10,177 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 15:16:10,235 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 19 treesize of output 18 [2023-04-02 15:16:10,377 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 15:16:10,378 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 15:16:10,379 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 19 treesize of output 12 [2023-04-02 15:16:10,420 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 12 proven. 40 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-02 15:16:10,420 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:16:10,534 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [154657507] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:16:10,534 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [759703498] [2023-04-02 15:16:10,536 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-04-02 15:16:10,536 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:16:10,536 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:16:10,536 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:16:10,536 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:16:10,547 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:16:10,883 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 15:16:10,893 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:16:10,894 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:16:10,896 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:16:12,201 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4373#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:16:12,201 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:16:12,201 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:16:12,201 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 20] total 30 [2023-04-02 15:16:12,201 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196553649] [2023-04-02 15:16:12,201 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:16:12,202 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2023-04-02 15:16:12,202 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:16:12,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2023-04-02 15:16:12,203 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=2604, Unknown=7, NotChecked=0, Total=2862 [2023-04-02 15:16:12,203 INFO L87 Difference]: Start difference. First operand 102 states and 110 transitions. Second operand has 30 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 24 states have internal predecessors, (46), 14 states have call successors, (18), 4 states have call predecessors, (18), 4 states have return successors, (16), 13 states have call predecessors, (16), 12 states have call successors, (16) [2023-04-02 15:16:14,257 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] [2023-04-02 15:16:16,280 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:16:18,806 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:16:20,817 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:16:20,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:16:20,868 INFO L93 Difference]: Finished difference Result 155 states and 167 transitions. [2023-04-02 15:16:20,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-04-02 15:16:20,868 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 24 states have internal predecessors, (46), 14 states have call successors, (18), 4 states have call predecessors, (18), 4 states have return successors, (16), 13 states have call predecessors, (16), 12 states have call successors, (16) Word has length 53 [2023-04-02 15:16:20,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:16:20,869 INFO L225 Difference]: With dead ends: 155 [2023-04-02 15:16:20,869 INFO L226 Difference]: Without dead ends: 153 [2023-04-02 15:16:20,871 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 87 SyntacticMatches, 6 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1555 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=456, Invalid=4367, Unknown=7, NotChecked=0, Total=4830 [2023-04-02 15:16:20,871 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 79 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 729 mSolverCounterSat, 57 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 185 SdHoareTripleChecker+Invalid, 790 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 729 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.4s IncrementalHoareTripleChecker+Time [2023-04-02 15:16:20,871 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 185 Invalid, 790 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 729 Invalid, 4 Unknown, 0 Unchecked, 8.4s Time] [2023-04-02 15:16:20,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2023-04-02 15:16:20,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 93. [2023-04-02 15:16:20,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 59 states have (on average 1.1016949152542372) internal successors, (65), 62 states have internal predecessors, (65), 19 states have call successors, (19), 15 states have call predecessors, (19), 14 states have return successors, (18), 15 states have call predecessors, (18), 18 states have call successors, (18) [2023-04-02 15:16:20,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 102 transitions. [2023-04-02 15:16:20,893 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 102 transitions. Word has length 53 [2023-04-02 15:16:20,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:16:20,894 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 102 transitions. [2023-04-02 15:16:20,894 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 24 states have internal predecessors, (46), 14 states have call successors, (18), 4 states have call predecessors, (18), 4 states have return successors, (16), 13 states have call predecessors, (16), 12 states have call successors, (16) [2023-04-02 15:16:20,894 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 102 transitions. [2023-04-02 15:16:20,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2023-04-02 15:16:20,896 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:16:20,896 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:16:20,902 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-04-02 15:16:21,100 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-04-02 15:16:21,101 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:16:21,101 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:16:21,101 INFO L85 PathProgramCache]: Analyzing trace with hash 1742633693, now seen corresponding path program 7 times [2023-04-02 15:16:21,101 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:16:21,101 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [751084335] [2023-04-02 15:16:21,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:16:21,102 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:16:21,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:16:21,175 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 14 proven. 19 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-04-02 15:16:21,175 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:16:21,175 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [751084335] [2023-04-02 15:16:21,175 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [751084335] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:16:21,175 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [628315346] [2023-04-02 15:16:21,175 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 15:16:21,175 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:16:21,175 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:16:21,176 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) [2023-04-02 15:16:21,179 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-04-02 15:16:21,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:16:21,226 INFO L262 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-02 15:16:21,227 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:16:21,302 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 21 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-04-02 15:16:21,302 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:16:21,375 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 21 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-04-02 15:16:21,376 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [628315346] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:16:21,376 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [881805908] [2023-04-02 15:16:21,378 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-04-02 15:16:21,378 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:16:21,378 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:16:21,379 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:16:21,379 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:16:21,389 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:16:21,737 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 15:16:21,747 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:16:21,748 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:16:21,750 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:16:22,772 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5140#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:16:22,772 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:16:22,772 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:16:22,772 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2023-04-02 15:16:22,772 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588442534] [2023-04-02 15:16:22,772 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:16:22,773 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-04-02 15:16:22,773 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:16:22,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-04-02 15:16:22,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=1030, Unknown=7, NotChecked=0, Total=1190 [2023-04-02 15:16:22,774 INFO L87 Difference]: Start difference. First operand 93 states and 102 transitions. Second operand has 16 states, 16 states have (on average 2.4375) internal successors, (39), 16 states have internal predecessors, (39), 13 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 12 states have call predecessors, (14), 12 states have call successors, (14) [2023-04-02 15:16:22,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:16:22,936 INFO L93 Difference]: Finished difference Result 124 states and 140 transitions. [2023-04-02 15:16:22,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-04-02 15:16:22,936 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.4375) internal successors, (39), 16 states have internal predecessors, (39), 13 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 12 states have call predecessors, (14), 12 states have call successors, (14) Word has length 55 [2023-04-02 15:16:22,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:16:22,937 INFO L225 Difference]: With dead ends: 124 [2023-04-02 15:16:22,937 INFO L226 Difference]: Without dead ends: 82 [2023-04-02 15:16:22,938 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 135 SyntacticMatches, 6 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 552 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=217, Invalid=1416, Unknown=7, NotChecked=0, Total=1640 [2023-04-02 15:16:22,938 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 17 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:16:22,939 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 101 Invalid, 172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 140 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:16:22,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2023-04-02 15:16:22,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 70. [2023-04-02 15:16:22,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 43 states have (on average 1.0930232558139534) internal successors, (47), 45 states have internal predecessors, (47), 15 states have call successors, (15), 12 states have call predecessors, (15), 11 states have return successors, (14), 12 states have call predecessors, (14), 14 states have call successors, (14) [2023-04-02 15:16:22,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 76 transitions. [2023-04-02 15:16:22,948 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 76 transitions. Word has length 55 [2023-04-02 15:16:22,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:16:22,948 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 76 transitions. [2023-04-02 15:16:22,949 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.4375) internal successors, (39), 16 states have internal predecessors, (39), 13 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 12 states have call predecessors, (14), 12 states have call successors, (14) [2023-04-02 15:16:22,949 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 76 transitions. [2023-04-02 15:16:22,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2023-04-02 15:16:22,949 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:16:22,949 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:16:22,954 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-04-02 15:16:23,164 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,SelfDestructingSolverStorable10 [2023-04-02 15:16:23,164 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:16:23,164 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:16:23,165 INFO L85 PathProgramCache]: Analyzing trace with hash -1574843464, now seen corresponding path program 8 times [2023-04-02 15:16:23,165 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:16:23,165 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1723508664] [2023-04-02 15:16:23,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:16:23,165 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:16:23,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:16:23,480 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 11 proven. 40 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2023-04-02 15:16:23,480 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:16:23,481 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1723508664] [2023-04-02 15:16:23,481 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1723508664] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:16:23,481 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [265269291] [2023-04-02 15:16:23,481 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:16:23,481 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:16:23,481 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:16:23,482 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) [2023-04-02 15:16:23,484 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-04-02 15:16:23,567 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-04-02 15:16:23,567 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:16:23,568 INFO L262 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 39 conjunts are in the unsatisfiable core [2023-04-02 15:16:23,570 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:16:23,710 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 [2023-04-02 15:16:24,003 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 [2023-04-02 15:16:24,055 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 5 proven. 46 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2023-04-02 15:16:24,055 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:16:24,198 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 [2023-04-02 15:16:24,201 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 [2023-04-02 15:16:24,409 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 11 proven. 40 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2023-04-02 15:16:24,410 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [265269291] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:16:24,410 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2116726868] [2023-04-02 15:16:24,411 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-04-02 15:16:24,411 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:16:24,411 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:16:24,411 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:16:24,411 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:16:24,421 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:16:24,751 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 15:16:24,761 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:16:24,762 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:16:24,764 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:16:28,165 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5869#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:16:28,165 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:16:28,165 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:16:28,165 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 18, 17] total 42 [2023-04-02 15:16:28,165 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1303376785] [2023-04-02 15:16:28,166 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:16:28,166 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2023-04-02 15:16:28,166 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:16:28,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2023-04-02 15:16:28,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=322, Invalid=3330, Unknown=8, NotChecked=0, Total=3660 [2023-04-02 15:16:28,167 INFO L87 Difference]: Start difference. First operand 70 states and 76 transitions. Second operand has 42 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 35 states have internal predecessors, (67), 24 states have call successors, (27), 4 states have call predecessors, (27), 3 states have return successors, (25), 24 states have call predecessors, (25), 22 states have call successors, (25) [2023-04-02 15:16:30,316 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] [2023-04-02 15:16:32,346 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:16:34,386 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:16:36,493 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:16:38,967 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:16:40,992 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:16:43,136 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:16:43,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:16:43,462 INFO L93 Difference]: Finished difference Result 135 states and 148 transitions. [2023-04-02 15:16:43,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2023-04-02 15:16:43,462 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 35 states have internal predecessors, (67), 24 states have call successors, (27), 4 states have call predecessors, (27), 3 states have return successors, (25), 24 states have call predecessors, (25), 22 states have call successors, (25) Word has length 60 [2023-04-02 15:16:43,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:16:43,463 INFO L225 Difference]: With dead ends: 135 [2023-04-02 15:16:43,463 INFO L226 Difference]: Without dead ends: 133 [2023-04-02 15:16:43,465 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 133 SyntacticMatches, 6 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2145 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=626, Invalid=6008, Unknown=8, NotChecked=0, Total=6642 [2023-04-02 15:16:43,465 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 90 mSDsluCounter, 324 mSDsCounter, 0 mSdLazyCounter, 872 mSolverCounterSat, 90 mSolverCounterUnsat, 8 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 349 SdHoareTripleChecker+Invalid, 970 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 872 IncrementalHoareTripleChecker+Invalid, 8 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.8s IncrementalHoareTripleChecker+Time [2023-04-02 15:16:43,465 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [98 Valid, 349 Invalid, 970 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 872 Invalid, 8 Unknown, 0 Unchecked, 14.8s Time] [2023-04-02 15:16:43,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2023-04-02 15:16:43,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 108. [2023-04-02 15:16:43,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 70 states have (on average 1.0571428571428572) internal successors, (74), 72 states have internal predecessors, (74), 22 states have call successors, (22), 16 states have call predecessors, (22), 15 states have return successors, (21), 19 states have call predecessors, (21), 21 states have call successors, (21) [2023-04-02 15:16:43,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 117 transitions. [2023-04-02 15:16:43,483 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 117 transitions. Word has length 60 [2023-04-02 15:16:43,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:16:43,484 INFO L495 AbstractCegarLoop]: Abstraction has 108 states and 117 transitions. [2023-04-02 15:16:43,484 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 35 states have internal predecessors, (67), 24 states have call successors, (27), 4 states have call predecessors, (27), 3 states have return successors, (25), 24 states have call predecessors, (25), 22 states have call successors, (25) [2023-04-02 15:16:43,484 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 117 transitions. [2023-04-02 15:16:43,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2023-04-02 15:16:43,484 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:16:43,484 INFO L195 NwaCegarLoop]: trace histogram [8, 6, 6, 6, 6, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:16:43,491 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-04-02 15:16:43,689 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,SelfDestructingSolverStorable11 [2023-04-02 15:16:43,689 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:16:43,690 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:16:43,690 INFO L85 PathProgramCache]: Analyzing trace with hash -1702093158, now seen corresponding path program 9 times [2023-04-02 15:16:43,690 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:16:43,690 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [652848910] [2023-04-02 15:16:43,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:16:43,690 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:16:43,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:16:44,108 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 11 proven. 63 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-04-02 15:16:44,109 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:16:44,109 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [652848910] [2023-04-02 15:16:44,109 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [652848910] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:16:44,109 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1510567797] [2023-04-02 15:16:44,109 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:16:44,109 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:16:44,109 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:16:44,110 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) [2023-04-02 15:16:44,112 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-04-02 15:16:44,177 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:16:44,177 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:16:44,178 INFO L262 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 51 conjunts are in the unsatisfiable core [2023-04-02 15:16:44,181 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:16:44,334 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 15:16:44,397 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 19 treesize of output 18 [2023-04-02 15:16:44,459 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 19 treesize of output 18 [2023-04-02 15:16:44,527 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 19 treesize of output 18 [2023-04-02 15:16:44,699 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 15:16:44,700 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 15:16:44,701 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 19 treesize of output 12 [2023-04-02 15:16:44,747 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 28 proven. 73 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-04-02 15:16:44,747 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:16:44,867 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1510567797] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:16:44,867 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [21317211] [2023-04-02 15:16:44,868 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-04-02 15:16:44,868 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:16:44,868 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:16:44,868 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:16:44,868 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:16:44,886 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:16:45,212 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 15:16:45,223 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:16:45,223 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:16:45,225 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:16:48,560 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6592#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:16:48,561 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:16:48,561 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:16:48,561 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 22] total 34 [2023-04-02 15:16:48,561 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069882818] [2023-04-02 15:16:48,561 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:16:48,561 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2023-04-02 15:16:48,561 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:16:48,562 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2023-04-02 15:16:48,562 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=289, Invalid=3009, Unknown=8, NotChecked=0, Total=3306 [2023-04-02 15:16:48,562 INFO L87 Difference]: Start difference. First operand 108 states and 117 transitions. Second operand has 34 states, 30 states have (on average 1.8) internal successors, (54), 28 states have internal predecessors, (54), 18 states have call successors, (22), 4 states have call predecessors, (22), 4 states have return successors, (20), 17 states have call predecessors, (20), 16 states have call successors, (20) [2023-04-02 15:16:50,628 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] [2023-04-02 15:16:51,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:16:51,240 INFO L93 Difference]: Finished difference Result 138 states and 152 transitions. [2023-04-02 15:16:51,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2023-04-02 15:16:51,241 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 30 states have (on average 1.8) internal successors, (54), 28 states have internal predecessors, (54), 18 states have call successors, (22), 4 states have call predecessors, (22), 4 states have return successors, (20), 17 states have call predecessors, (20), 16 states have call successors, (20) Word has length 63 [2023-04-02 15:16:51,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:16:51,242 INFO L225 Difference]: With dead ends: 138 [2023-04-02 15:16:51,242 INFO L226 Difference]: Without dead ends: 136 [2023-04-02 15:16:51,243 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 101 SyntacticMatches, 10 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1993 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=520, Invalid=5172, Unknown=8, NotChecked=0, Total=5700 [2023-04-02 15:16:51,243 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 87 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 907 mSolverCounterSat, 70 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 978 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 907 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2023-04-02 15:16:51,243 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 186 Invalid, 978 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 907 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2023-04-02 15:16:51,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2023-04-02 15:16:51,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 117. [2023-04-02 15:16:51,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 76 states have (on average 1.0526315789473684) internal successors, (80), 79 states have internal predecessors, (80), 24 states have call successors, (24), 17 states have call predecessors, (24), 16 states have return successors, (23), 20 states have call predecessors, (23), 23 states have call successors, (23) [2023-04-02 15:16:51,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 127 transitions. [2023-04-02 15:16:51,263 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 127 transitions. Word has length 63 [2023-04-02 15:16:51,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:16:51,263 INFO L495 AbstractCegarLoop]: Abstraction has 117 states and 127 transitions. [2023-04-02 15:16:51,264 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 30 states have (on average 1.8) internal successors, (54), 28 states have internal predecessors, (54), 18 states have call successors, (22), 4 states have call predecessors, (22), 4 states have return successors, (20), 17 states have call predecessors, (20), 16 states have call successors, (20) [2023-04-02 15:16:51,264 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 127 transitions. [2023-04-02 15:16:51,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2023-04-02 15:16:51,264 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:16:51,264 INFO L195 NwaCegarLoop]: trace histogram [7, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:16:51,271 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-04-02 15:16:51,469 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,SelfDestructingSolverStorable12 [2023-04-02 15:16:51,469 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:16:51,470 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:16:51,470 INFO L85 PathProgramCache]: Analyzing trace with hash 1394985917, now seen corresponding path program 10 times [2023-04-02 15:16:51,470 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:16:51,470 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1782177966] [2023-04-02 15:16:51,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:16:51,470 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:16:51,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:16:51,780 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 11 proven. 55 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-04-02 15:16:51,781 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:16:51,781 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1782177966] [2023-04-02 15:16:51,781 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1782177966] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:16:51,781 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [259271714] [2023-04-02 15:16:51,781 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 15:16:51,781 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:16:51,781 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:16:51,782 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) [2023-04-02 15:16:51,784 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-04-02 15:16:51,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:16:51,840 INFO L262 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 46 conjunts are in the unsatisfiable core [2023-04-02 15:16:51,842 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:16:52,018 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 15:16:52,087 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 15:16:52,088 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 [2023-04-02 15:16:52,365 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 [2023-04-02 15:16:52,416 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 15 proven. 62 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-04-02 15:16:52,416 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:16:52,490 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 [2023-04-02 15:16:52,492 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 [2023-04-02 15:16:52,626 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 11 proven. 55 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-04-02 15:16:52,627 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [259271714] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:16:52,627 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1109867777] [2023-04-02 15:16:52,628 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-04-02 15:16:52,628 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:16:52,628 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:16:52,628 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:16:52,628 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:16:52,637 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:16:52,996 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 15:16:53,006 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:16:53,007 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:16:53,009 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:16:54,444 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7459#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:16:54,445 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:16:54,445 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:16:54,445 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 20, 18] total 36 [2023-04-02 15:16:54,445 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771045693] [2023-04-02 15:16:54,445 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:16:54,446 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-04-02 15:16:54,446 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:16:54,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-04-02 15:16:54,447 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=2714, Unknown=7, NotChecked=0, Total=2970 [2023-04-02 15:16:54,447 INFO L87 Difference]: Start difference. First operand 117 states and 127 transitions. Second operand has 36 states, 32 states have (on average 1.84375) internal successors, (59), 30 states have internal predecessors, (59), 21 states have call successors, (24), 4 states have call predecessors, (24), 3 states have return successors, (21), 20 states have call predecessors, (21), 19 states have call successors, (21) [2023-04-02 15:16:55,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:16:55,031 INFO L93 Difference]: Finished difference Result 131 states and 140 transitions. [2023-04-02 15:16:55,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-04-02 15:16:55,031 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 32 states have (on average 1.84375) internal successors, (59), 30 states have internal predecessors, (59), 21 states have call successors, (24), 4 states have call predecessors, (24), 3 states have return successors, (21), 20 states have call predecessors, (21), 19 states have call successors, (21) Word has length 65 [2023-04-02 15:16:55,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:16:55,032 INFO L225 Difference]: With dead ends: 131 [2023-04-02 15:16:55,032 INFO L226 Difference]: Without dead ends: 129 [2023-04-02 15:16:55,033 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 148 SyntacticMatches, 12 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1263 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=348, Invalid=3805, Unknown=7, NotChecked=0, Total=4160 [2023-04-02 15:16:55,033 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 45 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 816 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 291 SdHoareTripleChecker+Invalid, 850 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 816 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-02 15:16:55,033 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 291 Invalid, 850 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 816 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-02 15:16:55,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2023-04-02 15:16:55,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 128. [2023-04-02 15:16:55,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 84 states have (on average 1.0476190476190477) internal successors, (88), 87 states have internal predecessors, (88), 25 states have call successors, (25), 19 states have call predecessors, (25), 18 states have return successors, (24), 21 states have call predecessors, (24), 24 states have call successors, (24) [2023-04-02 15:16:55,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 137 transitions. [2023-04-02 15:16:55,055 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 137 transitions. Word has length 65 [2023-04-02 15:16:55,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:16:55,055 INFO L495 AbstractCegarLoop]: Abstraction has 128 states and 137 transitions. [2023-04-02 15:16:55,055 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 32 states have (on average 1.84375) internal successors, (59), 30 states have internal predecessors, (59), 21 states have call successors, (24), 4 states have call predecessors, (24), 3 states have return successors, (21), 20 states have call predecessors, (21), 19 states have call successors, (21) [2023-04-02 15:16:55,055 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 137 transitions. [2023-04-02 15:16:55,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2023-04-02 15:16:55,056 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:16:55,056 INFO L195 NwaCegarLoop]: trace histogram [7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:16:55,061 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-04-02 15:16:55,260 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-04-02 15:16:55,261 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:16:55,261 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:16:55,261 INFO L85 PathProgramCache]: Analyzing trace with hash 629988437, now seen corresponding path program 11 times [2023-04-02 15:16:55,261 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:16:55,261 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1095699865] [2023-04-02 15:16:55,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:16:55,261 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:16:55,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:16:55,592 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 14 proven. 65 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-04-02 15:16:55,593 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:16:55,593 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1095699865] [2023-04-02 15:16:55,593 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1095699865] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:16:55,593 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1157690933] [2023-04-02 15:16:55,593 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:16:55,593 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:16:55,593 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:16:55,594 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:16:55,597 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-04-02 15:16:55,705 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-04-02 15:16:55,705 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:16:55,709 INFO L262 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 48 conjunts are in the unsatisfiable core [2023-04-02 15:16:55,711 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:16:55,887 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 [2023-04-02 15:16:56,297 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 [2023-04-02 15:16:56,359 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 9 proven. 79 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2023-04-02 15:16:56,359 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:16:56,567 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 [2023-04-02 15:16:56,569 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 [2023-04-02 15:16:56,809 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 14 proven. 65 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-04-02 15:16:56,809 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1157690933] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:16:56,809 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1307341556] [2023-04-02 15:16:56,810 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-04-02 15:16:56,810 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:16:56,810 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:16:56,810 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:16:56,810 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:16:56,823 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:16:57,145 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 15:16:57,155 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:16:57,156 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:16:57,158 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:17:00,614 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8369#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:17:00,615 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:17:00,615 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:17:00,615 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 22, 19] total 51 [2023-04-02 15:17:00,615 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269820643] [2023-04-02 15:17:00,615 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:17:00,615 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2023-04-02 15:17:00,615 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:17:00,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2023-04-02 15:17:00,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=387, Invalid=4435, Unknown=8, NotChecked=0, Total=4830 [2023-04-02 15:17:00,616 INFO L87 Difference]: Start difference. First operand 128 states and 137 transitions. Second operand has 51 states, 47 states have (on average 1.7446808510638299) internal successors, (82), 44 states have internal predecessors, (82), 30 states have call successors, (33), 4 states have call predecessors, (33), 4 states have return successors, (31), 30 states have call predecessors, (31), 28 states have call successors, (31) [2023-04-02 15:17:02,769 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] [2023-04-02 15:17:04,802 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:17:06,849 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:17:08,879 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:17:12,262 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:17:14,769 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:17:16,814 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:17:19,515 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] [2023-04-02 15:17:20,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:17:20,865 INFO L93 Difference]: Finished difference Result 192 states and 205 transitions. [2023-04-02 15:17:20,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2023-04-02 15:17:20,866 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 47 states have (on average 1.7446808510638299) internal successors, (82), 44 states have internal predecessors, (82), 30 states have call successors, (33), 4 states have call predecessors, (33), 4 states have return successors, (31), 30 states have call predecessors, (31), 28 states have call successors, (31) Word has length 72 [2023-04-02 15:17:20,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:17:20,867 INFO L225 Difference]: With dead ends: 192 [2023-04-02 15:17:20,867 INFO L226 Difference]: Without dead ends: 190 [2023-04-02 15:17:20,868 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 161 SyntacticMatches, 8 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3603 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=1004, Invalid=10118, Unknown=8, NotChecked=0, Total=11130 [2023-04-02 15:17:20,868 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 107 mSDsluCounter, 308 mSDsCounter, 0 mSdLazyCounter, 1538 mSolverCounterSat, 128 mSolverCounterUnsat, 13 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 345 SdHoareTripleChecker+Invalid, 1679 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 128 IncrementalHoareTripleChecker+Valid, 1538 IncrementalHoareTripleChecker+Invalid, 13 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.4s IncrementalHoareTripleChecker+Time [2023-04-02 15:17:20,868 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [116 Valid, 345 Invalid, 1679 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [128 Valid, 1538 Invalid, 13 Unknown, 0 Unchecked, 19.4s Time] [2023-04-02 15:17:20,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2023-04-02 15:17:20,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 172. [2023-04-02 15:17:20,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 115 states have (on average 1.0347826086956522) internal successors, (119), 118 states have internal predecessors, (119), 33 states have call successors, (33), 24 states have call predecessors, (33), 23 states have return successors, (32), 29 states have call predecessors, (32), 32 states have call successors, (32) [2023-04-02 15:17:20,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 184 transitions. [2023-04-02 15:17:20,902 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 184 transitions. Word has length 72 [2023-04-02 15:17:20,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:17:20,902 INFO L495 AbstractCegarLoop]: Abstraction has 172 states and 184 transitions. [2023-04-02 15:17:20,902 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 47 states have (on average 1.7446808510638299) internal successors, (82), 44 states have internal predecessors, (82), 30 states have call successors, (33), 4 states have call predecessors, (33), 4 states have return successors, (31), 30 states have call predecessors, (31), 28 states have call successors, (31) [2023-04-02 15:17:20,902 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 184 transitions. [2023-04-02 15:17:20,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2023-04-02 15:17:20,903 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:17:20,903 INFO L195 NwaCegarLoop]: trace histogram [8, 6, 6, 6, 6, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:17:20,907 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2023-04-02 15:17:21,103 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:17:21,103 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:17:21,104 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:17:21,104 INFO L85 PathProgramCache]: Analyzing trace with hash 421526746, now seen corresponding path program 12 times [2023-04-02 15:17:21,104 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:17:21,104 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [669725482] [2023-04-02 15:17:21,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:17:21,104 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:17:21,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:17:21,526 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 14 proven. 83 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2023-04-02 15:17:21,526 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:17:21,527 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [669725482] [2023-04-02 15:17:21,527 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [669725482] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:17:21,527 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1568317506] [2023-04-02 15:17:21,527 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:17:21,527 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:17:21,527 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:17:21,528 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:17:21,529 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-04-02 15:17:21,596 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:17:21,596 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:17:21,597 INFO L262 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 51 conjunts are in the unsatisfiable core [2023-04-02 15:17:21,599 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:17:21,821 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 15:17:21,893 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 19 treesize of output 18 [2023-04-02 15:17:22,317 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 [2023-04-02 15:17:22,376 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 18 proven. 100 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2023-04-02 15:17:22,377 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:17:22,481 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 [2023-04-02 15:17:22,483 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 [2023-04-02 15:17:22,640 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 14 proven. 83 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2023-04-02 15:17:22,640 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1568317506] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:17:22,640 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1345155326] [2023-04-02 15:17:22,642 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-04-02 15:17:22,642 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:17:22,643 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:17:22,643 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:17:22,643 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:17:22,653 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:17:23,011 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 15:17:23,023 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:17:23,024 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:17:23,026 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:17:26,515 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9509#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:17:26,515 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:17:26,515 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:17:26,515 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 24, 20] total 44 [2023-04-02 15:17:26,515 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [172698120] [2023-04-02 15:17:26,515 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:17:26,516 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2023-04-02 15:17:26,516 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:17:26,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2023-04-02 15:17:26,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=284, Invalid=3614, Unknown=8, NotChecked=0, Total=3906 [2023-04-02 15:17:26,517 INFO L87 Difference]: Start difference. First operand 172 states and 184 transitions. Second operand has 44 states, 39 states have (on average 1.8461538461538463) internal successors, (72), 37 states have internal predecessors, (72), 26 states have call successors, (29), 4 states have call predecessors, (29), 4 states have return successors, (26), 25 states have call predecessors, (26), 24 states have call successors, (26) [2023-04-02 15:17:28,591 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] [2023-04-02 15:17:30,636 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:17:33,530 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:17:33,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:17:33,604 INFO L93 Difference]: Finished difference Result 242 states and 260 transitions. [2023-04-02 15:17:33,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2023-04-02 15:17:33,605 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 39 states have (on average 1.8461538461538463) internal successors, (72), 37 states have internal predecessors, (72), 26 states have call successors, (29), 4 states have call predecessors, (29), 4 states have return successors, (26), 25 states have call predecessors, (26), 24 states have call successors, (26) Word has length 77 [2023-04-02 15:17:33,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:17:33,606 INFO L225 Difference]: With dead ends: 242 [2023-04-02 15:17:33,606 INFO L226 Difference]: Without dead ends: 240 [2023-04-02 15:17:33,606 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 178 SyntacticMatches, 13 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2117 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=551, Invalid=6247, Unknown=8, NotChecked=0, Total=6806 [2023-04-02 15:17:33,607 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 113 mSDsluCounter, 323 mSDsCounter, 0 mSdLazyCounter, 1543 mSolverCounterSat, 87 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 360 SdHoareTripleChecker+Invalid, 1633 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 1543 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.7s IncrementalHoareTripleChecker+Time [2023-04-02 15:17:33,607 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [120 Valid, 360 Invalid, 1633 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 1543 Invalid, 3 Unknown, 0 Unchecked, 6.7s Time] [2023-04-02 15:17:33,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2023-04-02 15:17:33,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 192. [2023-04-02 15:17:33,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 128 states have (on average 1.046875) internal successors, (134), 132 states have internal predecessors, (134), 37 states have call successors, (37), 27 states have call predecessors, (37), 26 states have return successors, (36), 32 states have call predecessors, (36), 36 states have call successors, (36) [2023-04-02 15:17:33,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 207 transitions. [2023-04-02 15:17:33,644 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 207 transitions. Word has length 77 [2023-04-02 15:17:33,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:17:33,644 INFO L495 AbstractCegarLoop]: Abstraction has 192 states and 207 transitions. [2023-04-02 15:17:33,644 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 39 states have (on average 1.8461538461538463) internal successors, (72), 37 states have internal predecessors, (72), 26 states have call successors, (29), 4 states have call predecessors, (29), 4 states have return successors, (26), 25 states have call predecessors, (26), 24 states have call successors, (26) [2023-04-02 15:17:33,644 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 207 transitions. [2023-04-02 15:17:33,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2023-04-02 15:17:33,645 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:17:33,645 INFO L195 NwaCegarLoop]: trace histogram [8, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:17:33,652 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2023-04-02 15:17:33,847 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-04-02 15:17:33,848 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:17:33,848 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:17:33,848 INFO L85 PathProgramCache]: Analyzing trace with hash 1886101656, now seen corresponding path program 13 times [2023-04-02 15:17:33,848 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:17:33,848 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [847763679] [2023-04-02 15:17:33,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:17:33,848 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:17:33,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:17:34,233 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 17 proven. 96 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2023-04-02 15:17:34,233 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:17:34,233 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [847763679] [2023-04-02 15:17:34,234 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [847763679] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:17:34,234 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [993503430] [2023-04-02 15:17:34,234 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 15:17:34,234 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:17:34,234 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:17:34,235 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:17:34,237 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-04-02 15:17:34,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:17:34,308 INFO L262 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 51 conjunts are in the unsatisfiable core [2023-04-02 15:17:34,310 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:17:34,596 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 15:17:35,146 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 [2023-04-02 15:17:35,210 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 16 proven. 109 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2023-04-02 15:17:35,211 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:17:35,296 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 [2023-04-02 15:17:35,299 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 [2023-04-02 15:17:35,431 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 17 proven. 96 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2023-04-02 15:17:35,431 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [993503430] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:17:35,432 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1775904778] [2023-04-02 15:17:35,432 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-04-02 15:17:35,432 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:17:35,433 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:17:35,433 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:17:35,433 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:17:35,451 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:17:35,779 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 15:17:35,790 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:17:35,791 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:17:35,793 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:17:37,347 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10762#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:17:37,347 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:17:37,347 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:17:37,347 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 25, 21] total 44 [2023-04-02 15:17:37,347 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1783466916] [2023-04-02 15:17:37,347 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:17:37,348 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2023-04-02 15:17:37,348 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:17:37,348 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2023-04-02 15:17:37,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=3621, Unknown=7, NotChecked=0, Total=3906 [2023-04-02 15:17:37,349 INFO L87 Difference]: Start difference. First operand 192 states and 207 transitions. Second operand has 44 states, 40 states have (on average 1.825) internal successors, (73), 38 states have internal predecessors, (73), 27 states have call successors, (30), 4 states have call predecessors, (30), 4 states have return successors, (27), 26 states have call predecessors, (27), 25 states have call successors, (27) [2023-04-02 15:17:39,483 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:17:41,638 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:17:42,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:17:42,574 INFO L93 Difference]: Finished difference Result 265 states and 285 transitions. [2023-04-02 15:17:42,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-04-02 15:17:42,575 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 40 states have (on average 1.825) internal successors, (73), 38 states have internal predecessors, (73), 27 states have call successors, (30), 4 states have call predecessors, (30), 4 states have return successors, (27), 26 states have call predecessors, (27), 25 states have call successors, (27) Word has length 84 [2023-04-02 15:17:42,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:17:42,576 INFO L225 Difference]: With dead ends: 265 [2023-04-02 15:17:42,576 INFO L226 Difference]: Without dead ends: 263 [2023-04-02 15:17:42,577 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 199 SyntacticMatches, 13 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1914 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=501, Invalid=5972, Unknown=7, NotChecked=0, Total=6480 [2023-04-02 15:17:42,577 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 92 mSDsluCounter, 485 mSDsCounter, 0 mSdLazyCounter, 2151 mSolverCounterSat, 60 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 528 SdHoareTripleChecker+Invalid, 2213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 2151 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.8s IncrementalHoareTripleChecker+Time [2023-04-02 15:17:42,578 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 528 Invalid, 2213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 2151 Invalid, 2 Unknown, 0 Unchecked, 4.8s Time] [2023-04-02 15:17:42,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2023-04-02 15:17:42,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 201. [2023-04-02 15:17:42,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 134 states have (on average 1.044776119402985) internal successors, (140), 138 states have internal predecessors, (140), 38 states have call successors, (38), 29 states have call predecessors, (38), 28 states have return successors, (37), 33 states have call predecessors, (37), 37 states have call successors, (37) [2023-04-02 15:17:42,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 215 transitions. [2023-04-02 15:17:42,624 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 215 transitions. Word has length 84 [2023-04-02 15:17:42,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:17:42,625 INFO L495 AbstractCegarLoop]: Abstraction has 201 states and 215 transitions. [2023-04-02 15:17:42,625 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 40 states have (on average 1.825) internal successors, (73), 38 states have internal predecessors, (73), 27 states have call successors, (30), 4 states have call predecessors, (30), 4 states have return successors, (27), 26 states have call predecessors, (27), 25 states have call successors, (27) [2023-04-02 15:17:42,625 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 215 transitions. [2023-04-02 15:17:42,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2023-04-02 15:17:42,626 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:17:42,626 INFO L195 NwaCegarLoop]: trace histogram [10, 8, 8, 8, 8, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:17:42,631 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2023-04-02 15:17:42,832 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-04-02 15:17:42,833 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:17:42,833 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:17:42,833 INFO L85 PathProgramCache]: Analyzing trace with hash -1334745670, now seen corresponding path program 14 times [2023-04-02 15:17:42,833 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:17:42,833 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1266482885] [2023-04-02 15:17:42,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:17:42,833 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:17:42,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:17:43,384 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 17 proven. 125 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2023-04-02 15:17:43,384 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:17:43,384 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1266482885] [2023-04-02 15:17:43,384 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1266482885] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:17:43,384 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [666762261] [2023-04-02 15:17:43,384 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:17:43,384 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:17:43,384 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:17:43,385 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:17:43,386 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-04-02 15:17:43,589 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2023-04-02 15:17:43,589 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:17:43,591 INFO L262 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 55 conjunts are in the unsatisfiable core [2023-04-02 15:17:43,593 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:17:43,785 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 [2023-04-02 15:17:43,865 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 23 treesize of output 22 [2023-04-02 15:17:43,923 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2023-04-02 15:17:43,923 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 25 treesize of output 24 [2023-04-02 15:17:44,011 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2023-04-02 15:17:44,011 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 25 treesize of output 24 [2023-04-02 15:17:44,339 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 [2023-04-02 15:17:44,401 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 44 proven. 136 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-02 15:17:44,401 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:17:44,549 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 20 treesize of output 18 [2023-04-02 15:17:44,552 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 [2023-04-02 15:17:44,710 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 14 proven. 125 refuted. 0 times theorem prover too weak. 101 trivial. 0 not checked. [2023-04-02 15:17:44,710 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [666762261] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:17:44,710 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [496708042] [2023-04-02 15:17:44,711 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-04-02 15:17:44,711 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:17:44,711 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:17:44,711 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:17:44,711 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:17:44,722 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:17:45,080 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 15:17:45,092 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:17:45,093 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:17:45,095 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:17:48,649 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12076#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:17:48,649 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:17:48,649 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:17:48,649 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 21] total 42 [2023-04-02 15:17:48,650 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608790561] [2023-04-02 15:17:48,650 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:17:48,650 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2023-04-02 15:17:48,650 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:17:48,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2023-04-02 15:17:48,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=3393, Unknown=8, NotChecked=0, Total=3660 [2023-04-02 15:17:48,651 INFO L87 Difference]: Start difference. First operand 201 states and 215 transitions. Second operand has 42 states, 38 states have (on average 1.9736842105263157) internal successors, (75), 35 states have internal predecessors, (75), 27 states have call successors, (32), 4 states have call predecessors, (32), 3 states have return successors, (30), 27 states have call predecessors, (30), 25 states have call successors, (30) [2023-04-02 15:17:50,799 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:17:52,832 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:17:54,861 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:17:56,891 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:17:58,923 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:18:01,060 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:18:03,256 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] [2023-04-02 15:18:03,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:18:03,752 INFO L93 Difference]: Finished difference Result 259 states and 282 transitions. [2023-04-02 15:18:03,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-04-02 15:18:03,757 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 38 states have (on average 1.9736842105263157) internal successors, (75), 35 states have internal predecessors, (75), 27 states have call successors, (32), 4 states have call predecessors, (32), 3 states have return successors, (30), 27 states have call predecessors, (30), 25 states have call successors, (30) Word has length 87 [2023-04-02 15:18:03,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:18:03,758 INFO L225 Difference]: With dead ends: 259 [2023-04-02 15:18:03,758 INFO L226 Difference]: Without dead ends: 257 [2023-04-02 15:18:03,758 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 299 GetRequests, 206 SyntacticMatches, 19 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1981 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=402, Invalid=5290, Unknown=8, NotChecked=0, Total=5700 [2023-04-02 15:18:03,759 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 54 mSDsluCounter, 424 mSDsCounter, 0 mSdLazyCounter, 2032 mSolverCounterSat, 48 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 467 SdHoareTripleChecker+Invalid, 2087 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 2032 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.8s IncrementalHoareTripleChecker+Time [2023-04-02 15:18:03,759 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 467 Invalid, 2087 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 2032 Invalid, 7 Unknown, 0 Unchecked, 14.8s Time] [2023-04-02 15:18:03,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2023-04-02 15:18:03,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 234. [2023-04-02 15:18:03,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 234 states, 156 states have (on average 1.0384615384615385) internal successors, (162), 162 states have internal predecessors, (162), 47 states have call successors, (47), 31 states have call predecessors, (47), 30 states have return successors, (46), 40 states have call predecessors, (46), 46 states have call successors, (46) [2023-04-02 15:18:03,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 255 transitions. [2023-04-02 15:18:03,811 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 255 transitions. Word has length 87 [2023-04-02 15:18:03,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:18:03,811 INFO L495 AbstractCegarLoop]: Abstraction has 234 states and 255 transitions. [2023-04-02 15:18:03,812 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 38 states have (on average 1.9736842105263157) internal successors, (75), 35 states have internal predecessors, (75), 27 states have call successors, (32), 4 states have call predecessors, (32), 3 states have return successors, (30), 27 states have call predecessors, (30), 25 states have call successors, (30) [2023-04-02 15:18:03,812 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 255 transitions. [2023-04-02 15:18:03,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-04-02 15:18:03,812 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:18:03,812 INFO L195 NwaCegarLoop]: trace histogram [9, 7, 7, 7, 7, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:18:03,822 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2023-04-02 15:18:04,017 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-04-02 15:18:04,018 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:18:04,018 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:18:04,018 INFO L85 PathProgramCache]: Analyzing trace with hash -362733155, now seen corresponding path program 15 times [2023-04-02 15:18:04,018 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:18:04,018 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1958807238] [2023-04-02 15:18:04,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:18:04,018 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:18:04,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:18:04,453 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 17 proven. 117 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2023-04-02 15:18:04,454 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:18:04,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1958807238] [2023-04-02 15:18:04,454 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1958807238] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:18:04,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1480479994] [2023-04-02 15:18:04,454 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:18:04,454 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:18:04,454 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:18:04,455 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:18:04,457 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-04-02 15:18:04,536 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:18:04,536 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:18:04,538 INFO L262 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 55 conjunts are in the unsatisfiable core [2023-04-02 15:18:04,540 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:18:04,816 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 15:18:04,895 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 19 treesize of output 18 [2023-04-02 15:18:05,432 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 [2023-04-02 15:18:05,497 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 27 proven. 133 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2023-04-02 15:18:05,497 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:18:05,597 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 [2023-04-02 15:18:05,599 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 [2023-04-02 15:18:05,715 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 17 proven. 117 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2023-04-02 15:18:05,715 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1480479994] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:18:05,715 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1843143385] [2023-04-02 15:18:05,716 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-04-02 15:18:05,716 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:18:05,716 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:18:05,716 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:18:05,716 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:18:05,726 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:18:06,036 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 15:18:06,052 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:18:06,053 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:18:06,055 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:18:07,657 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13447#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:18:07,657 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:18:07,657 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:18:07,657 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 26, 22] total 46 [2023-04-02 15:18:07,657 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1673159491] [2023-04-02 15:18:07,657 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:18:07,658 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2023-04-02 15:18:07,658 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:18:07,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2023-04-02 15:18:07,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=3859, Unknown=7, NotChecked=0, Total=4160 [2023-04-02 15:18:07,659 INFO L87 Difference]: Start difference. First operand 234 states and 255 transitions. Second operand has 46 states, 42 states have (on average 1.8571428571428572) internal successors, (78), 40 states have internal predecessors, (78), 29 states have call successors, (32), 4 states have call predecessors, (32), 4 states have return successors, (29), 28 states have call predecessors, (29), 27 states have call successors, (29) [2023-04-02 15:18:09,810 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] [2023-04-02 15:18:11,943 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] [2023-04-02 15:18:13,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:18:13,046 INFO L93 Difference]: Finished difference Result 309 states and 332 transitions. [2023-04-02 15:18:13,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2023-04-02 15:18:13,046 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 42 states have (on average 1.8571428571428572) internal successors, (78), 40 states have internal predecessors, (78), 29 states have call successors, (32), 4 states have call predecessors, (32), 4 states have return successors, (29), 28 states have call predecessors, (29), 27 states have call successors, (29) Word has length 89 [2023-04-02 15:18:13,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:18:13,048 INFO L225 Difference]: With dead ends: 309 [2023-04-02 15:18:13,048 INFO L226 Difference]: Without dead ends: 307 [2023-04-02 15:18:13,048 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 311 GetRequests, 210 SyntacticMatches, 16 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2352 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=593, Invalid=6882, Unknown=7, NotChecked=0, Total=7482 [2023-04-02 15:18:13,049 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 97 mSDsluCounter, 511 mSDsCounter, 0 mSdLazyCounter, 2301 mSolverCounterSat, 72 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 554 SdHoareTripleChecker+Invalid, 2375 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 72 IncrementalHoareTripleChecker+Valid, 2301 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2023-04-02 15:18:13,049 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [105 Valid, 554 Invalid, 2375 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [72 Valid, 2301 Invalid, 2 Unknown, 0 Unchecked, 4.9s Time] [2023-04-02 15:18:13,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2023-04-02 15:18:13,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 248. [2023-04-02 15:18:13,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 248 states, 166 states have (on average 1.0421686746987953) internal successors, (173), 172 states have internal predecessors, (173), 48 states have call successors, (48), 34 states have call predecessors, (48), 33 states have return successors, (47), 41 states have call predecessors, (47), 47 states have call successors, (47) [2023-04-02 15:18:13,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 268 transitions. [2023-04-02 15:18:13,114 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 268 transitions. Word has length 89 [2023-04-02 15:18:13,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:18:13,114 INFO L495 AbstractCegarLoop]: Abstraction has 248 states and 268 transitions. [2023-04-02 15:18:13,114 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 42 states have (on average 1.8571428571428572) internal successors, (78), 40 states have internal predecessors, (78), 29 states have call successors, (32), 4 states have call predecessors, (32), 4 states have return successors, (29), 28 states have call predecessors, (29), 27 states have call successors, (29) [2023-04-02 15:18:13,114 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 268 transitions. [2023-04-02 15:18:13,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2023-04-02 15:18:13,116 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:18:13,116 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:18:13,124 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2023-04-02 15:18:13,319 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:18:13,320 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:18:13,320 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:18:13,320 INFO L85 PathProgramCache]: Analyzing trace with hash -680400102, now seen corresponding path program 16 times [2023-04-02 15:18:13,320 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:18:13,320 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [172306712] [2023-04-02 15:18:13,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:18:13,320 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:18:13,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:18:13,486 INFO L134 CoverageAnalysis]: Checked inductivity of 236 backedges. 53 proven. 67 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2023-04-02 15:18:13,487 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:18:13,487 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [172306712] [2023-04-02 15:18:13,487 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [172306712] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:18:13,487 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [454149019] [2023-04-02 15:18:13,487 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 15:18:13,487 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:18:13,487 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:18:13,488 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:18:13,512 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-04-02 15:18:13,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:18:13,571 INFO L262 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 16 conjunts are in the unsatisfiable core [2023-04-02 15:18:13,573 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:18:13,729 INFO L134 CoverageAnalysis]: Checked inductivity of 236 backedges. 69 proven. 51 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2023-04-02 15:18:13,730 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:18:13,862 INFO L134 CoverageAnalysis]: Checked inductivity of 236 backedges. 69 proven. 51 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2023-04-02 15:18:13,862 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [454149019] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:18:13,862 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [276317120] [2023-04-02 15:18:13,863 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-04-02 15:18:13,863 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:18:13,864 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:18:13,864 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:18:13,864 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:18:13,873 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:18:14,225 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 15:18:14,234 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:18:14,236 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:18:14,237 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:18:15,358 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14915#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:18:15,358 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:18:15,359 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:18:15,359 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2023-04-02 15:18:15,359 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762729922] [2023-04-02 15:18:15,359 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:18:15,359 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-04-02 15:18:15,359 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:18:15,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-04-02 15:18:15,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=1645, Unknown=7, NotChecked=0, Total=1892 [2023-04-02 15:18:15,360 INFO L87 Difference]: Start difference. First operand 248 states and 268 transitions. Second operand has 25 states, 25 states have (on average 2.28) internal successors, (57), 25 states have internal predecessors, (57), 22 states have call successors, (25), 2 states have call predecessors, (25), 1 states have return successors, (23), 21 states have call predecessors, (23), 21 states have call successors, (23) [2023-04-02 15:18:15,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:18:15,776 INFO L93 Difference]: Finished difference Result 281 states and 308 transitions. [2023-04-02 15:18:15,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-04-02 15:18:15,776 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.28) internal successors, (57), 25 states have internal predecessors, (57), 22 states have call successors, (25), 2 states have call predecessors, (25), 1 states have return successors, (23), 21 states have call predecessors, (23), 21 states have call successors, (23) Word has length 91 [2023-04-02 15:18:15,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:18:15,777 INFO L225 Difference]: With dead ends: 281 [2023-04-02 15:18:15,777 INFO L226 Difference]: Without dead ends: 149 [2023-04-02 15:18:15,778 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 234 SyntacticMatches, 12 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1304 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=507, Invalid=3146, Unknown=7, NotChecked=0, Total=3660 [2023-04-02 15:18:15,778 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 29 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 302 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 161 SdHoareTripleChecker+Invalid, 354 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 302 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 15:18:15,778 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 161 Invalid, 354 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 302 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 15:18:15,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2023-04-02 15:18:15,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 133. [2023-04-02 15:18:15,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 86 states have (on average 1.0465116279069768) internal successors, (90), 89 states have internal predecessors, (90), 26 states have call successors, (26), 21 states have call predecessors, (26), 20 states have return successors, (25), 22 states have call predecessors, (25), 25 states have call successors, (25) [2023-04-02 15:18:15,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 141 transitions. [2023-04-02 15:18:15,807 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 141 transitions. Word has length 91 [2023-04-02 15:18:15,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:18:15,807 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 141 transitions. [2023-04-02 15:18:15,807 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.28) internal successors, (57), 25 states have internal predecessors, (57), 22 states have call successors, (25), 2 states have call predecessors, (25), 1 states have return successors, (23), 21 states have call predecessors, (23), 21 states have call successors, (23) [2023-04-02 15:18:15,807 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 141 transitions. [2023-04-02 15:18:15,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2023-04-02 15:18:15,808 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:18:15,808 INFO L195 NwaCegarLoop]: trace histogram [9, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:18:15,815 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2023-04-02 15:18:16,012 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:18:16,013 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:18:16,013 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:18:16,013 INFO L85 PathProgramCache]: Analyzing trace with hash -1361106315, now seen corresponding path program 17 times [2023-04-02 15:18:16,013 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:18:16,013 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [316178587] [2023-04-02 15:18:16,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:18:16,014 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:18:16,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:18:16,454 INFO L134 CoverageAnalysis]: Checked inductivity of 271 backedges. 20 proven. 133 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2023-04-02 15:18:16,454 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:18:16,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [316178587] [2023-04-02 15:18:16,454 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [316178587] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:18:16,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [37056214] [2023-04-02 15:18:16,454 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:18:16,454 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:18:16,455 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:18:16,455 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:18:16,456 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-04-02 15:18:16,592 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2023-04-02 15:18:16,592 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:18:16,594 INFO L262 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 37 conjunts are in the unsatisfiable core [2023-04-02 15:18:16,596 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:18:16,866 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 [2023-04-02 15:18:18,955 WARN L861 $PredicateComparison]: unable to prove that (exists ((|v_main_~#a~0.offset_BEFORE_CALL_456| Int) (|v_main_~#a~0.base_BEFORE_CALL_409| Int) (v_main_~i~0_428 Int)) (and (<= (+ 2 v_main_~i~0_428) (select (select |c_#memory_int| |v_main_~#a~0.base_BEFORE_CALL_409|) (+ |v_main_~#a~0.offset_BEFORE_CALL_456| (* 4 v_main_~i~0_428)))) (<= v_main_~i~0_428 7))) is different from true [2023-04-02 15:18:22,651 WARN L861 $PredicateComparison]: unable to prove that (exists ((|v_main_~#a~0.offset_BEFORE_CALL_457| Int) (v_main_~i~0_428 Int) (|v_main_~#a~0.base_BEFORE_CALL_410| Int)) (and (<= (+ 2 v_main_~i~0_428) (select (select |c_#memory_int| |v_main_~#a~0.base_BEFORE_CALL_410|) (+ |v_main_~#a~0.offset_BEFORE_CALL_457| (* 4 v_main_~i~0_428)))) (<= v_main_~i~0_428 7))) is different from true [2023-04-02 15:18:30,786 WARN L861 $PredicateComparison]: unable to prove that (exists ((|v_main_~#a~0.offset_BEFORE_CALL_458| Int) (v_main_~i~0_428 Int) (|v_main_~#a~0.base_BEFORE_CALL_411| Int)) (and (<= (+ 2 v_main_~i~0_428) (select (select |c_#memory_int| |v_main_~#a~0.base_BEFORE_CALL_411|) (+ |v_main_~#a~0.offset_BEFORE_CALL_458| (* 4 v_main_~i~0_428)))) (<= v_main_~i~0_428 7))) is different from true [2023-04-02 15:18:38,638 WARN L861 $PredicateComparison]: unable to prove that (and (exists ((v_main_~i~0_428 Int) (|v_main_~#a~0.base_BEFORE_CALL_412| Int) (|v_main_~#a~0.offset_BEFORE_CALL_459| Int)) (and (<= v_main_~i~0_428 7) (<= (+ 2 v_main_~i~0_428) (select (select |c_#memory_int| |v_main_~#a~0.base_BEFORE_CALL_412|) (+ |v_main_~#a~0.offset_BEFORE_CALL_459| (* 4 v_main_~i~0_428)))))) (exists ((|v_main_~#a~0.offset_BEFORE_CALL_458| Int) (|v_main_~#a~0.base_BEFORE_CALL_411| Int) (v_main_~i~0_434 Int)) (and (<= (+ 2 v_main_~i~0_434) (select (select |c_#memory_int| |v_main_~#a~0.base_BEFORE_CALL_411|) (+ |v_main_~#a~0.offset_BEFORE_CALL_458| (* 4 v_main_~i~0_434)))) (<= v_main_~i~0_434 7)))) is different from true [2023-04-02 15:18:42,473 WARN L861 $PredicateComparison]: unable to prove that (and (exists ((|v_main_~#a~0.base_BEFORE_CALL_413| Int) (|v_main_~#a~0.offset_BEFORE_CALL_460| Int) (v_main_~i~0_428 Int)) (and (<= v_main_~i~0_428 7) (<= (+ 2 v_main_~i~0_428) (select (select |c_#memory_int| |v_main_~#a~0.base_BEFORE_CALL_413|) (+ |v_main_~#a~0.offset_BEFORE_CALL_460| (* 4 v_main_~i~0_428)))))) (exists ((|v_main_~#a~0.offset_BEFORE_CALL_458| Int) (|v_main_~#a~0.base_BEFORE_CALL_411| Int) (v_main_~i~0_434 Int)) (and (<= (+ 2 v_main_~i~0_434) (select (select |c_#memory_int| |v_main_~#a~0.base_BEFORE_CALL_411|) (+ |v_main_~#a~0.offset_BEFORE_CALL_458| (* 4 v_main_~i~0_434)))) (<= v_main_~i~0_434 7)))) is different from true [2023-04-02 15:18:48,548 WARN L861 $PredicateComparison]: unable to prove that (and (exists ((|v_main_~#a~0.offset_BEFORE_CALL_458| Int) (|v_main_~#a~0.base_BEFORE_CALL_411| Int) (v_main_~i~0_434 Int)) (and (<= (+ 2 v_main_~i~0_434) (select (select |c_#memory_int| |v_main_~#a~0.base_BEFORE_CALL_411|) (+ |v_main_~#a~0.offset_BEFORE_CALL_458| (* 4 v_main_~i~0_434)))) (<= v_main_~i~0_434 7))) (exists ((|v_main_~#a~0.offset_BEFORE_CALL_461| Int) (|v_main_~#a~0.base_BEFORE_CALL_414| Int) (v_main_~i~0_428 Int)) (and (<= (+ 2 v_main_~i~0_428) (select (select |c_#memory_int| |v_main_~#a~0.base_BEFORE_CALL_414|) (+ |v_main_~#a~0.offset_BEFORE_CALL_461| (* 4 v_main_~i~0_428)))) (<= v_main_~i~0_428 7)))) is different from true [2023-04-02 15:18:55,277 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2023-04-02 15:18:55,277 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 25 treesize of output 12 [2023-04-02 15:18:55,349 INFO L134 CoverageAnalysis]: Checked inductivity of 271 backedges. 59 proven. 82 refuted. 0 times theorem prover too weak. 58 trivial. 72 not checked. [2023-04-02 15:18:55,350 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:18:55,441 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [37056214] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:18:55,441 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [121018282] [2023-04-02 15:18:55,442 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-04-02 15:18:55,442 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:18:55,442 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:18:55,442 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:18:55,442 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:18:55,452 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:18:55,794 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 15:18:55,804 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 15:18:55,805 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:18:55,807 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:18:57,474 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15957#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:18:57,474 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:18:57,474 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:18:57,474 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 32] total 52 [2023-04-02 15:18:57,474 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713055435] [2023-04-02 15:18:57,475 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:18:57,475 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2023-04-02 15:18:57,475 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:18:57,475 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2023-04-02 15:18:57,476 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=310, Invalid=4119, Unknown=17, NotChecked=810, Total=5256 [2023-04-02 15:18:57,477 INFO L87 Difference]: Start difference. First operand 133 states and 141 transitions. Second operand has 52 states, 49 states have (on average 1.816326530612245) internal successors, (89), 43 states have internal predecessors, (89), 29 states have call successors, (32), 9 states have call predecessors, (32), 8 states have return successors, (30), 29 states have call predecessors, (30), 27 states have call successors, (30) [2023-04-02 15:19:00,516 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] [2023-04-02 15:19:04,572 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] [2023-04-02 15:19:06,531 WARN L861 $PredicateComparison]: unable to prove that (and (exists ((|v_main_~#a~0.offset_BEFORE_CALL_456| Int) (|v_main_~#a~0.base_BEFORE_CALL_409| Int) (v_main_~i~0_428 Int)) (and (<= (+ 2 v_main_~i~0_428) (select (select |c_#memory_int| |v_main_~#a~0.base_BEFORE_CALL_409|) (+ |v_main_~#a~0.offset_BEFORE_CALL_456| (* 4 v_main_~i~0_428)))) (<= v_main_~i~0_428 7))) (exists ((|v_main_~#a~0.offset_BEFORE_CALL_457| Int) (v_main_~i~0_428 Int) (|v_main_~#a~0.base_BEFORE_CALL_410| Int)) (and (<= (+ 2 v_main_~i~0_428) (select (select |c_#memory_int| |v_main_~#a~0.base_BEFORE_CALL_410|) (+ |v_main_~#a~0.offset_BEFORE_CALL_457| (* 4 v_main_~i~0_428)))) (<= v_main_~i~0_428 7)))) is different from true [2023-04-02 15:19:18,032 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-02 15:19:22,094 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] [2023-04-02 15:19:27,348 WARN L861 $PredicateComparison]: unable to prove that (and (exists ((|v_main_~#a~0.offset_BEFORE_CALL_456| Int) (|v_main_~#a~0.base_BEFORE_CALL_409| Int) (v_main_~i~0_428 Int)) (and (<= (+ 2 v_main_~i~0_428) (select (select |c_#memory_int| |v_main_~#a~0.base_BEFORE_CALL_409|) (+ |v_main_~#a~0.offset_BEFORE_CALL_456| (* 4 v_main_~i~0_428)))) (<= v_main_~i~0_428 7))) (exists ((|v_main_~#a~0.offset_BEFORE_CALL_457| Int) (v_main_~i~0_428 Int) (|v_main_~#a~0.base_BEFORE_CALL_410| Int)) (and (<= (+ 2 v_main_~i~0_428) (select (select |c_#memory_int| |v_main_~#a~0.base_BEFORE_CALL_410|) (+ |v_main_~#a~0.offset_BEFORE_CALL_457| (* 4 v_main_~i~0_428)))) (<= v_main_~i~0_428 7))) (exists ((|v_main_~#a~0.offset_BEFORE_CALL_458| Int) (v_main_~i~0_428 Int) (|v_main_~#a~0.base_BEFORE_CALL_411| Int)) (and (<= (+ 2 v_main_~i~0_428) (select (select |c_#memory_int| |v_main_~#a~0.base_BEFORE_CALL_411|) (+ |v_main_~#a~0.offset_BEFORE_CALL_458| (* 4 v_main_~i~0_428)))) (<= v_main_~i~0_428 7)))) is different from true