/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 IntervalDomain -i ../sv-benchmarks/c/loops-crafted-1/nested_delay_nd.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-03-31 23:06:19,644 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-03-31 23:06:19,646 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-03-31 23:06:19,675 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-03-31 23:06:19,675 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-03-31 23:06:19,677 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-03-31 23:06:19,680 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-03-31 23:06:19,681 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-03-31 23:06:19,682 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-03-31 23:06:19,686 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-03-31 23:06:19,687 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-03-31 23:06:19,688 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-03-31 23:06:19,688 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-03-31 23:06:19,690 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-03-31 23:06:19,691 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-03-31 23:06:19,691 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-03-31 23:06:19,692 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-03-31 23:06:19,692 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-03-31 23:06:19,694 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-03-31 23:06:19,698 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-03-31 23:06:19,699 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-03-31 23:06:19,700 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-03-31 23:06:19,701 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-03-31 23:06:19,701 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-03-31 23:06:19,707 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-03-31 23:06:19,709 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-03-31 23:06:19,710 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-03-31 23:06:19,711 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-03-31 23:06:19,711 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-03-31 23:06:19,712 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-03-31 23:06:19,712 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-03-31 23:06:19,712 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-03-31 23:06:19,712 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-03-31 23:06:19,712 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-03-31 23:06:19,713 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-03-31 23:06:19,713 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-03-31 23:06:19,714 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 [2023-03-31 23:06:19,736 INFO L113 SettingsManager]: Loading preferences was successful [2023-03-31 23:06:19,736 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-03-31 23:06:19,737 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-03-31 23:06:19,737 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-03-31 23:06:19,737 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-03-31 23:06:19,737 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-03-31 23:06:19,737 INFO L138 SettingsManager]: * User list type=DISABLED [2023-03-31 23:06:19,738 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-03-31 23:06:19,738 INFO L138 SettingsManager]: * Explicit value domain=true [2023-03-31 23:06:19,738 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-03-31 23:06:19,738 INFO L138 SettingsManager]: * Octagon Domain=false [2023-03-31 23:06:19,738 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-03-31 23:06:19,738 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-03-31 23:06:19,739 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-03-31 23:06:19,739 INFO L138 SettingsManager]: * Interval Domain=false [2023-03-31 23:06:19,739 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-03-31 23:06:19,739 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-03-31 23:06:19,739 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-03-31 23:06:19,739 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-03-31 23:06:19,739 INFO L138 SettingsManager]: * sizeof long=4 [2023-03-31 23:06:19,739 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-03-31 23:06:19,740 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-03-31 23:06:19,740 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-03-31 23:06:19,740 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-03-31 23:06:19,740 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-03-31 23:06:19,740 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-03-31 23:06:19,740 INFO L138 SettingsManager]: * sizeof long double=12 [2023-03-31 23:06:19,740 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-03-31 23:06:19,740 INFO L138 SettingsManager]: * Use constant arrays=true [2023-03-31 23:06:19,740 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-03-31 23:06:19,741 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-03-31 23:06:19,741 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-03-31 23:06:19,741 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 23:06:19,741 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-03-31 23:06:19,741 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-03-31 23:06:19,741 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-03-31 23:06:19,741 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-03-31 23:06:19,741 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-03-31 23:06:19,741 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-03-31 23:06:19,741 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-03-31 23:06:19,741 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-03-31 23:06:19,742 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> IntervalDomain [2023-03-31 23:06:19,931 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-03-31 23:06:19,948 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-03-31 23:06:19,950 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-03-31 23:06:19,951 INFO L271 PluginConnector]: Initializing CDTParser... [2023-03-31 23:06:19,952 INFO L275 PluginConnector]: CDTParser initialized [2023-03-31 23:06:19,953 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops-crafted-1/nested_delay_nd.c [2023-03-31 23:06:20,988 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-03-31 23:06:21,131 INFO L351 CDTParser]: Found 1 translation units. [2023-03-31 23:06:21,132 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/nested_delay_nd.c [2023-03-31 23:06:21,135 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5c4b8ed4e/950867ef437342bfaa09cb8731eb47d3/FLAG31647ff7b [2023-03-31 23:06:21,146 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5c4b8ed4e/950867ef437342bfaa09cb8731eb47d3 [2023-03-31 23:06:21,148 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-03-31 23:06:21,149 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-03-31 23:06:21,150 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-03-31 23:06:21,150 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-03-31 23:06:21,152 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-03-31 23:06:21,152 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 11:06:21" (1/1) ... [2023-03-31 23:06:21,153 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@17b097c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:06:21, skipping insertion in model container [2023-03-31 23:06:21,153 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 11:06:21" (1/1) ... [2023-03-31 23:06:21,157 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-03-31 23:06:21,165 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-03-31 23:06:21,245 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/loops-crafted-1/nested_delay_nd.c[465,478] [2023-03-31 23:06:21,254 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 23:06:21,259 INFO L203 MainTranslator]: Completed pre-run [2023-03-31 23:06:21,266 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/loops-crafted-1/nested_delay_nd.c[465,478] [2023-03-31 23:06:21,270 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 23:06:21,278 INFO L208 MainTranslator]: Completed translation [2023-03-31 23:06:21,278 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:06:21 WrapperNode [2023-03-31 23:06:21,278 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-03-31 23:06:21,279 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-03-31 23:06:21,279 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-03-31 23:06:21,279 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-03-31 23:06:21,286 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:06:21" (1/1) ... [2023-03-31 23:06:21,286 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:06:21" (1/1) ... [2023-03-31 23:06:21,290 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:06:21" (1/1) ... [2023-03-31 23:06:21,290 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:06:21" (1/1) ... [2023-03-31 23:06:21,292 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:06:21" (1/1) ... [2023-03-31 23:06:21,294 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:06:21" (1/1) ... [2023-03-31 23:06:21,295 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:06:21" (1/1) ... [2023-03-31 23:06:21,296 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:06:21" (1/1) ... [2023-03-31 23:06:21,297 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-03-31 23:06:21,297 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-03-31 23:06:21,297 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-03-31 23:06:21,297 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-03-31 23:06:21,298 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:06:21" (1/1) ... [2023-03-31 23:06:21,301 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 23:06:21,308 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:06:21,321 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) [2023-03-31 23:06:21,327 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 [2023-03-31 23:06:21,359 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-03-31 23:06:21,359 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-03-31 23:06:21,359 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-03-31 23:06:21,360 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-03-31 23:06:21,360 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-03-31 23:06:21,360 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-03-31 23:06:21,360 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-03-31 23:06:21,361 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-03-31 23:06:21,361 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-03-31 23:06:21,361 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-03-31 23:06:21,361 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-03-31 23:06:21,361 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-03-31 23:06:21,361 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-03-31 23:06:21,361 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-03-31 23:06:21,361 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-03-31 23:06:21,361 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-03-31 23:06:21,361 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-03-31 23:06:21,361 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-03-31 23:06:21,361 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-03-31 23:06:21,362 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-03-31 23:06:21,409 INFO L236 CfgBuilder]: Building ICFG [2023-03-31 23:06:21,410 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-03-31 23:06:21,534 INFO L277 CfgBuilder]: Performing block encoding [2023-03-31 23:06:21,626 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-03-31 23:06:21,627 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-03-31 23:06:21,631 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 11:06:21 BoogieIcfgContainer [2023-03-31 23:06:21,632 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-03-31 23:06:21,633 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-03-31 23:06:21,633 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-03-31 23:06:21,635 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-03-31 23:06:21,635 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.03 11:06:21" (1/3) ... [2023-03-31 23:06:21,636 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64140ab8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 11:06:21, skipping insertion in model container [2023-03-31 23:06:21,636 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:06:21" (2/3) ... [2023-03-31 23:06:21,636 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64140ab8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 11:06:21, skipping insertion in model container [2023-03-31 23:06:21,636 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 11:06:21" (3/3) ... [2023-03-31 23:06:21,637 INFO L112 eAbstractionObserver]: Analyzing ICFG nested_delay_nd.c [2023-03-31 23:06:21,650 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-03-31 23:06:21,650 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-03-31 23:06:21,693 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-03-31 23:06:21,699 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;@7b09ad6e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-03-31 23:06:21,700 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-03-31 23:06:21,704 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 13 states have internal predecessors, (15), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-03-31 23:06:21,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-03-31 23:06:21,710 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:06:21,710 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:06:21,711 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:06:21,715 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:06:21,715 INFO L85 PathProgramCache]: Analyzing trace with hash -1065726219, now seen corresponding path program 1 times [2023-03-31 23:06:21,722 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:06:21,723 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1632702440] [2023-03-31 23:06:21,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:06:21,723 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:06:21,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:06:21,985 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:06:21,986 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:06:21,986 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1632702440] [2023-03-31 23:06:21,986 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1632702440] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 23:06:21,987 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 23:06:21,987 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-03-31 23:06:21,988 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251148655] [2023-03-31 23:06:21,988 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 23:06:21,991 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-03-31 23:06:21,991 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:06:22,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-03-31 23:06:22,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-03-31 23:06:22,019 INFO L87 Difference]: Start difference. First operand has 21 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 13 states have internal predecessors, (15), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-03-31 23:06:22,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:06:22,072 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2023-03-31 23:06:22,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-03-31 23:06:22,074 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 15 [2023-03-31 23:06:22,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:06:22,078 INFO L225 Difference]: With dead ends: 32 [2023-03-31 23:06:22,078 INFO L226 Difference]: Without dead ends: 20 [2023-03-31 23:06:22,080 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 [2023-03-31 23:06:22,084 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 12 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 23:06:22,085 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 23 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 23:06:22,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-03-31 23:06:22,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2023-03-31 23:06:22,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 12 states have internal predecessors, (13), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 23:06:22,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2023-03-31 23:06:22,112 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 15 [2023-03-31 23:06:22,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:06:22,113 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2023-03-31 23:06:22,114 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-03-31 23:06:22,114 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2023-03-31 23:06:22,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-03-31 23:06:22,114 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:06:22,114 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:06:22,114 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-03-31 23:06:22,115 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:06:22,115 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:06:22,115 INFO L85 PathProgramCache]: Analyzing trace with hash 1059406511, now seen corresponding path program 1 times [2023-03-31 23:06:22,115 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:06:22,115 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [777755089] [2023-03-31 23:06:22,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:06:22,116 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:06:22,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:06:22,210 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:06:22,210 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:06:22,210 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [777755089] [2023-03-31 23:06:22,210 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [777755089] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:06:22,210 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [915237769] [2023-03-31 23:06:22,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:06:22,211 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:06:22,211 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:06:22,213 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) [2023-03-31 23:06:22,214 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-03-31 23:06:22,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:06:22,261 INFO L262 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 4 conjunts are in the unsatisfiable core [2023-03-31 23:06:22,264 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:06:22,318 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:06:22,319 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:06:22,354 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:06:22,355 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [915237769] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:06:22,355 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [51782018] [2023-03-31 23:06:22,367 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-03-31 23:06:22,368 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:06:22,370 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:06:22,373 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:06:22,373 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:06:22,444 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 15 for LOIs [2023-03-31 23:06:22,707 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 103 for LOIs [2023-03-31 23:06:22,716 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 26 for LOIs [2023-03-31 23:06:22,723 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-03-31 23:06:22,733 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:06:23,117 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '209#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-03-31 23:06:23,118 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:06:23,118 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:06:23,118 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2023-03-31 23:06:23,118 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1374753521] [2023-03-31 23:06:23,119 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:06:23,120 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-03-31 23:06:23,120 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:06:23,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-03-31 23:06:23,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=401, Unknown=0, NotChecked=0, Total=506 [2023-03-31 23:06:23,123 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 10 states, 10 states have (on average 2.0) internal successors, (20), 10 states have internal predecessors, (20), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2023-03-31 23:06:23,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:06:23,195 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2023-03-31 23:06:23,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-03-31 23:06:23,195 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 10 states have internal predecessors, (20), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 16 [2023-03-31 23:06:23,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:06:23,196 INFO L225 Difference]: With dead ends: 33 [2023-03-31 23:06:23,196 INFO L226 Difference]: Without dead ends: 23 [2023-03-31 23:06:23,196 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=125, Invalid=475, Unknown=0, NotChecked=0, Total=600 [2023-03-31 23:06:23,198 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 22 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 23:06:23,198 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 30 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 23:06:23,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-03-31 23:06:23,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2023-03-31 23:06:23,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 15 states have internal predecessors, (16), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 23:06:23,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2023-03-31 23:06:23,205 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 16 [2023-03-31 23:06:23,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:06:23,205 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2023-03-31 23:06:23,205 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 10 states have internal predecessors, (20), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2023-03-31 23:06:23,205 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2023-03-31 23:06:23,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-03-31 23:06:23,206 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:06:23,206 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:06:23,221 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-03-31 23:06:23,411 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 [2023-03-31 23:06:23,411 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:06:23,412 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:06:23,412 INFO L85 PathProgramCache]: Analyzing trace with hash -1921618571, now seen corresponding path program 2 times [2023-03-31 23:06:23,412 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:06:23,415 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [670403906] [2023-03-31 23:06:23,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:06:23,415 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:06:23,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:06:23,589 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:06:23,589 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:06:23,589 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [670403906] [2023-03-31 23:06:23,589 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [670403906] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:06:23,589 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [457024644] [2023-03-31 23:06:23,589 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 23:06:23,590 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:06:23,590 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:06:23,591 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) [2023-03-31 23:06:23,593 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-03-31 23:06:23,636 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-03-31 23:06:23,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:06:23,637 INFO L262 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 7 conjunts are in the unsatisfiable core [2023-03-31 23:06:23,638 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:06:23,704 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:06:23,705 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:06:23,786 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:06:23,787 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [457024644] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:06:23,787 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1659767857] [2023-03-31 23:06:23,793 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-03-31 23:06:23,793 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:06:23,794 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:06:23,794 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:06:23,794 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:06:23,830 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 15 for LOIs [2023-03-31 23:06:23,913 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 103 for LOIs [2023-03-31 23:06:23,916 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 26 for LOIs [2023-03-31 23:06:23,918 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-03-31 23:06:23,922 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:06:24,223 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '445#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-03-31 23:06:24,224 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:06:24,224 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:06:24,224 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 19 [2023-03-31 23:06:24,224 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1175662667] [2023-03-31 23:06:24,224 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:06:24,224 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-03-31 23:06:24,225 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:06:24,225 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-03-31 23:06:24,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=770, Unknown=0, NotChecked=0, Total=992 [2023-03-31 23:06:24,226 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 19 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 19 states have internal predecessors, (29), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2023-03-31 23:06:24,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:06:24,327 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2023-03-31 23:06:24,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-03-31 23:06:24,327 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 19 states have internal predecessors, (29), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 19 [2023-03-31 23:06:24,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:06:24,328 INFO L225 Difference]: With dead ends: 42 [2023-03-31 23:06:24,328 INFO L226 Difference]: Without dead ends: 29 [2023-03-31 23:06:24,328 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 566 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=302, Invalid=1030, Unknown=0, NotChecked=0, Total=1332 [2023-03-31 23:06:24,329 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 28 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 23:06:24,329 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 37 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 23:06:24,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-03-31 23:06:24,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2023-03-31 23:06:24,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 20 states have (on average 1.1) internal successors, (22), 21 states have internal predecessors, (22), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 23:06:24,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2023-03-31 23:06:24,333 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 19 [2023-03-31 23:06:24,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:06:24,333 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2023-03-31 23:06:24,333 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 19 states have internal predecessors, (29), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2023-03-31 23:06:24,334 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2023-03-31 23:06:24,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-03-31 23:06:24,334 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:06:24,334 INFO L195 NwaCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:06:24,339 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-03-31 23:06:24,538 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 [2023-03-31 23:06:24,539 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:06:24,539 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:06:24,539 INFO L85 PathProgramCache]: Analyzing trace with hash -1571650763, now seen corresponding path program 3 times [2023-03-31 23:06:24,539 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:06:24,539 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [724039623] [2023-03-31 23:06:24,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:06:24,540 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:06:24,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:06:24,733 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:06:24,733 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:06:24,734 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [724039623] [2023-03-31 23:06:24,734 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [724039623] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:06:24,734 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1803885160] [2023-03-31 23:06:24,734 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 23:06:24,734 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:06:24,734 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:06:24,735 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) [2023-03-31 23:06:24,738 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-03-31 23:06:24,781 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 23:06:24,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:06:24,782 INFO L262 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 40 conjunts are in the unsatisfiable core [2023-03-31 23:06:24,785 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:06:25,843 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 45 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:06:25,843 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:06:26,825 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 28 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:06:26,825 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1803885160] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:06:26,826 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1725063174] [2023-03-31 23:06:26,828 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-03-31 23:06:26,828 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:06:26,828 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:06:26,828 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:06:26,828 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:06:26,846 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 15 for LOIs [2023-03-31 23:06:26,912 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 103 for LOIs [2023-03-31 23:06:26,915 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 26 for LOIs [2023-03-31 23:06:26,917 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-03-31 23:06:26,920 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:06:27,613 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '778#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-03-31 23:06:27,613 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:06:27,613 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:06:27,613 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17, 17] total 44 [2023-03-31 23:06:27,613 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143993812] [2023-03-31 23:06:27,613 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:06:27,615 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2023-03-31 23:06:27,615 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:06:27,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2023-03-31 23:06:27,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=418, Invalid=2774, Unknown=0, NotChecked=0, Total=3192 [2023-03-31 23:06:27,616 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand has 44 states, 42 states have (on average 1.2142857142857142) internal successors, (51), 42 states have internal predecessors, (51), 5 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-03-31 23:06:29,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:06:29,350 INFO L93 Difference]: Finished difference Result 84 states and 95 transitions. [2023-03-31 23:06:29,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2023-03-31 23:06:29,369 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 42 states have (on average 1.2142857142857142) internal successors, (51), 42 states have internal predecessors, (51), 5 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 25 [2023-03-31 23:06:29,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:06:29,371 INFO L225 Difference]: With dead ends: 84 [2023-03-31 23:06:29,371 INFO L226 Difference]: Without dead ends: 65 [2023-03-31 23:06:29,374 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2739 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=1422, Invalid=8280, Unknown=0, NotChecked=0, Total=9702 [2023-03-31 23:06:29,376 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 74 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 320 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 353 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 320 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-03-31 23:06:29,377 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 128 Invalid, 353 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 320 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-03-31 23:06:29,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2023-03-31 23:06:29,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2023-03-31 23:06:29,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 51 states have (on average 1.0980392156862746) internal successors, (56), 52 states have internal predecessors, (56), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-03-31 23:06:29,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 67 transitions. [2023-03-31 23:06:29,402 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 67 transitions. Word has length 25 [2023-03-31 23:06:29,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:06:29,403 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 67 transitions. [2023-03-31 23:06:29,403 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 42 states have (on average 1.2142857142857142) internal successors, (51), 42 states have internal predecessors, (51), 5 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-03-31 23:06:29,403 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 67 transitions. [2023-03-31 23:06:29,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2023-03-31 23:06:29,407 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:06:29,407 INFO L195 NwaCegarLoop]: trace histogram [34, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:06:29,414 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-03-31 23:06:29,612 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 [2023-03-31 23:06:29,612 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:06:29,613 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:06:29,613 INFO L85 PathProgramCache]: Analyzing trace with hash -326581571, now seen corresponding path program 1 times [2023-03-31 23:06:29,613 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:06:29,613 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1307236292] [2023-03-31 23:06:29,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:06:29,613 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:06:29,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:06:29,894 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 306 proven. 66 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2023-03-31 23:06:29,895 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:06:29,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1307236292] [2023-03-31 23:06:29,895 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1307236292] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:06:29,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [380990334] [2023-03-31 23:06:29,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:06:29,895 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:06:29,895 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:06:29,896 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) [2023-03-31 23:06:29,898 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-03-31 23:06:29,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:06:29,968 INFO L262 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 14 conjunts are in the unsatisfiable core [2023-03-31 23:06:29,971 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:06:30,135 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 302 proven. 66 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2023-03-31 23:06:30,135 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:06:30,335 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 306 proven. 66 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2023-03-31 23:06:30,335 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [380990334] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:06:30,335 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [564704692] [2023-03-31 23:06:30,337 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-03-31 23:06:30,337 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:06:30,337 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:06:30,337 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:06:30,337 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:06:30,364 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 15 for LOIs [2023-03-31 23:06:30,535 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-03-31 23:06:30,537 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 26 for LOIs [2023-03-31 23:06:30,539 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-03-31 23:06:30,542 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:06:30,761 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1555#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-03-31 23:06:30,761 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:06:30,762 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:06:30,762 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 40 [2023-03-31 23:06:30,762 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405006987] [2023-03-31 23:06:30,762 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:06:30,762 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2023-03-31 23:06:30,762 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:06:30,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2023-03-31 23:06:30,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=730, Invalid=2026, Unknown=0, NotChecked=0, Total=2756 [2023-03-31 23:06:30,764 INFO L87 Difference]: Start difference. First operand 62 states and 67 transitions. Second operand has 40 states, 40 states have (on average 1.45) internal successors, (58), 40 states have internal predecessors, (58), 4 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2023-03-31 23:06:31,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:06:31,043 INFO L93 Difference]: Finished difference Result 140 states and 187 transitions. [2023-03-31 23:06:31,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-03-31 23:06:31,044 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.45) internal successors, (58), 40 states have internal predecessors, (58), 4 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) Word has length 63 [2023-03-31 23:06:31,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:06:31,045 INFO L225 Difference]: With dead ends: 140 [2023-03-31 23:06:31,045 INFO L226 Difference]: Without dead ends: 100 [2023-03-31 23:06:31,046 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1779 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1078, Invalid=3082, Unknown=0, NotChecked=0, Total=4160 [2023-03-31 23:06:31,047 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 42 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 23:06:31,047 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 51 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 23:06:31,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2023-03-31 23:06:31,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2023-03-31 23:06:31,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 89 states have (on average 1.0449438202247192) internal successors, (93), 90 states have internal predecessors, (93), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-03-31 23:06:31,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 104 transitions. [2023-03-31 23:06:31,059 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 104 transitions. Word has length 63 [2023-03-31 23:06:31,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:06:31,059 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 104 transitions. [2023-03-31 23:06:31,059 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.45) internal successors, (58), 40 states have internal predecessors, (58), 4 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2023-03-31 23:06:31,059 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 104 transitions. [2023-03-31 23:06:31,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2023-03-31 23:06:31,060 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:06:31,060 INFO L195 NwaCegarLoop]: trace histogram [72, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:06:31,065 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-03-31 23:06:31,265 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 [2023-03-31 23:06:31,265 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:06:31,266 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:06:31,267 INFO L85 PathProgramCache]: Analyzing trace with hash 1526004277, now seen corresponding path program 2 times [2023-03-31 23:06:31,268 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:06:31,268 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [554704237] [2023-03-31 23:06:31,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:06:31,268 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:06:31,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:06:31,882 INFO L134 CoverageAnalysis]: Checked inductivity of 2789 backedges. 1256 proven. 300 refuted. 0 times theorem prover too weak. 1233 trivial. 0 not checked. [2023-03-31 23:06:31,882 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:06:31,882 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [554704237] [2023-03-31 23:06:31,883 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [554704237] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:06:31,883 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1218231125] [2023-03-31 23:06:31,883 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 23:06:31,883 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:06:31,883 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:06:31,885 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) [2023-03-31 23:06:31,901 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-03-31 23:06:32,003 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2023-03-31 23:06:32,003 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:06:32,005 INFO L262 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 27 conjunts are in the unsatisfiable core [2023-03-31 23:06:32,007 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:06:32,446 INFO L134 CoverageAnalysis]: Checked inductivity of 2789 backedges. 1256 proven. 300 refuted. 0 times theorem prover too weak. 1233 trivial. 0 not checked. [2023-03-31 23:06:32,446 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:06:33,243 INFO L134 CoverageAnalysis]: Checked inductivity of 2789 backedges. 6 proven. 1550 refuted. 0 times theorem prover too weak. 1233 trivial. 0 not checked. [2023-03-31 23:06:33,244 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1218231125] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:06:33,244 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [668428960] [2023-03-31 23:06:33,245 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-03-31 23:06:33,245 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:06:33,245 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:06:33,246 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:06:33,246 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:06:33,260 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 15 for LOIs [2023-03-31 23:06:33,461 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-03-31 23:06:33,463 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 26 for LOIs [2023-03-31 23:06:33,465 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-03-31 23:06:33,468 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:06:33,700 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2724#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-03-31 23:06:33,701 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:06:33,701 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:06:33,701 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 79 [2023-03-31 23:06:33,701 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179274385] [2023-03-31 23:06:33,701 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:06:33,702 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2023-03-31 23:06:33,702 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:06:33,703 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2023-03-31 23:06:33,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2758, Invalid=5614, Unknown=0, NotChecked=0, Total=8372 [2023-03-31 23:06:33,704 INFO L87 Difference]: Start difference. First operand 100 states and 104 transitions. Second operand has 79 states, 79 states have (on average 1.3164556962025316) internal successors, (104), 79 states have internal predecessors, (104), 4 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2023-03-31 23:06:34,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:06:34,541 INFO L93 Difference]: Finished difference Result 243 states and 328 transitions. [2023-03-31 23:06:34,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2023-03-31 23:06:34,541 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 1.3164556962025316) internal successors, (104), 79 states have internal predecessors, (104), 4 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) Word has length 101 [2023-03-31 23:06:34,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:06:34,542 INFO L225 Difference]: With dead ends: 243 [2023-03-31 23:06:34,542 INFO L226 Difference]: Without dead ends: 178 [2023-03-31 23:06:34,545 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 240 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5601 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=4133, Invalid=9439, Unknown=0, NotChecked=0, Total=13572 [2023-03-31 23:06:34,545 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 2 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 133 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 133 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:06:34,545 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 66 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 133 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:06:34,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2023-03-31 23:06:34,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 178. [2023-03-31 23:06:34,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 167 states have (on average 1.0239520958083832) internal successors, (171), 168 states have internal predecessors, (171), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-03-31 23:06:34,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 182 transitions. [2023-03-31 23:06:34,570 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 182 transitions. Word has length 101 [2023-03-31 23:06:34,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:06:34,570 INFO L495 AbstractCegarLoop]: Abstraction has 178 states and 182 transitions. [2023-03-31 23:06:34,570 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 1.3164556962025316) internal successors, (104), 79 states have internal predecessors, (104), 4 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2023-03-31 23:06:34,570 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 182 transitions. [2023-03-31 23:06:34,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2023-03-31 23:06:34,571 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:06:34,571 INFO L195 NwaCegarLoop]: trace histogram [150, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:06:34,577 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-03-31 23:06:34,776 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 [2023-03-31 23:06:34,777 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:06:34,777 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:06:34,777 INFO L85 PathProgramCache]: Analyzing trace with hash 1989884405, now seen corresponding path program 3 times [2023-03-31 23:06:34,777 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:06:34,777 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1664333665] [2023-03-31 23:06:34,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:06:34,778 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:06:34,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:06:36,658 INFO L134 CoverageAnalysis]: Checked inductivity of 11642 backedges. 5208 proven. 1275 refuted. 0 times theorem prover too weak. 5159 trivial. 0 not checked. [2023-03-31 23:06:36,659 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:06:36,659 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1664333665] [2023-03-31 23:06:36,659 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1664333665] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:06:36,659 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1167335215] [2023-03-31 23:06:36,659 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 23:06:36,659 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:06:36,659 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:06:36,660 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) [2023-03-31 23:06:36,662 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-03-31 23:06:36,817 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 23:06:36,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:06:36,828 WARN L260 TraceCheckSpWp]: Trace formula consists of 694 conjuncts, 434 conjunts are in the unsatisfiable core [2023-03-31 23:06:36,842 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:06:47,900 INFO L134 CoverageAnalysis]: Checked inductivity of 11642 backedges. 204 proven. 11386 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2023-03-31 23:06:47,900 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:07:11,734 INFO L134 CoverageAnalysis]: Checked inductivity of 11642 backedges. 1332 proven. 10308 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-03-31 23:07:11,734 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1167335215] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:07:11,740 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [750281008] [2023-03-31 23:07:11,741 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-03-31 23:07:11,741 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:07:11,741 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:07:11,742 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:07:11,742 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:07:11,760 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 15 for LOIs [2023-03-31 23:07:11,921 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-03-31 23:07:11,923 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 26 for LOIs [2023-03-31 23:07:11,925 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-03-31 23:07:11,928 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:07:13,478 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4997#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-03-31 23:07:13,478 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:07:13,478 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:07:13,479 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 115, 162] total 327 [2023-03-31 23:07:13,479 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492311614] [2023-03-31 23:07:13,479 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:07:13,479 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 327 states [2023-03-31 23:07:13,479 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:07:13,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 327 interpolants. [2023-03-31 23:07:13,492 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13897, Invalid=101363, Unknown=0, NotChecked=0, Total=115260 [2023-03-31 23:07:13,493 INFO L87 Difference]: Start difference. First operand 178 states and 182 transitions. Second operand has 327 states, 322 states have (on average 1.0714285714285714) internal successors, (345), 325 states have internal predecessors, (345), 9 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2023-03-31 23:07:21,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:07:21,681 INFO L93 Difference]: Finished difference Result 464 states and 629 transitions. [2023-03-31 23:07:21,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2023-03-31 23:07:21,682 INFO L78 Accepts]: Start accepts. Automaton has has 327 states, 322 states have (on average 1.0714285714285714) internal successors, (345), 325 states have internal predecessors, (345), 9 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) Word has length 179 [2023-03-31 23:07:21,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:07:21,685 INFO L225 Difference]: With dead ends: 464 [2023-03-31 23:07:21,685 INFO L226 Difference]: Without dead ends: 347 [2023-03-31 23:07:21,698 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 701 GetRequests, 237 SyntacticMatches, 17 SemanticMatches, 447 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68321 ImplicationChecksByTransitivity, 36.1s TimeCoverageRelationStatistics Valid=31321, Invalid=169831, Unknown=0, NotChecked=0, Total=201152 [2023-03-31 23:07:21,699 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 567 mSDsluCounter, 280 mSDsCounter, 0 mSdLazyCounter, 3527 mSolverCounterSat, 289 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 567 SdHoareTripleChecker+Valid, 292 SdHoareTripleChecker+Invalid, 3816 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 289 IncrementalHoareTripleChecker+Valid, 3527 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2023-03-31 23:07:21,699 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [567 Valid, 292 Invalid, 3816 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [289 Valid, 3527 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2023-03-31 23:07:21,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 347 states. [2023-03-31 23:07:21,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 347 to 337. [2023-03-31 23:07:21,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 337 states, 324 states have (on average 1.0154320987654322) internal successors, (329), 326 states have internal predecessors, (329), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2023-03-31 23:07:21,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 342 transitions. [2023-03-31 23:07:21,762 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 342 transitions. Word has length 179 [2023-03-31 23:07:21,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:07:21,762 INFO L495 AbstractCegarLoop]: Abstraction has 337 states and 342 transitions. [2023-03-31 23:07:21,763 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 327 states, 322 states have (on average 1.0714285714285714) internal successors, (345), 325 states have internal predecessors, (345), 9 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2023-03-31 23:07:21,763 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 342 transitions. [2023-03-31 23:07:21,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2023-03-31 23:07:21,771 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:07:21,771 INFO L195 NwaCegarLoop]: trace histogram [304, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:07:21,789 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-03-31 23:07:21,977 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 [2023-03-31 23:07:21,978 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:07:21,978 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:07:21,978 INFO L85 PathProgramCache]: Analyzing trace with hash 1746916989, now seen corresponding path program 4 times [2023-03-31 23:07:21,978 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:07:21,978 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [630860664] [2023-03-31 23:07:21,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:07:21,978 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:07:22,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat