/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain EqDomain -i ../sv-benchmarks/c/loops-crafted-1/nested_delay_nd.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 11:10:34,714 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 11:10:34,716 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 11:10:34,750 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 11:10:34,750 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 11:10:34,752 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 11:10:34,755 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 11:10:34,757 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 11:10:34,759 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 11:10:34,764 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 11:10:34,765 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 11:10:34,766 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 11:10:34,766 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 11:10:34,768 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 11:10:34,769 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 11:10:34,771 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 11:10:34,772 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 11:10:34,772 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 11:10:34,774 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 11:10:34,778 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 11:10:34,779 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 11:10:34,780 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 11:10:34,780 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 11:10:34,781 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 11:10:34,786 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 11:10:34,786 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 11:10:34,786 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 11:10:34,786 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 11:10:34,787 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 11:10:34,787 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 11:10:34,787 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 11:10:34,788 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 11:10:34,788 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 11:10:34,788 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 11:10:34,789 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 11:10:34,789 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 11:10:34,789 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 11:10:34,790 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 11:10:34,790 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 11:10:34,790 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 11:10:34,791 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 11:10:34,791 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-01 11:10:34,804 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 11:10:34,804 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 11:10:34,804 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 11:10:34,804 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 11:10:34,805 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 11:10:34,805 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 11:10:34,805 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 11:10:34,805 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 11:10:34,805 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 11:10:34,805 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 11:10:34,805 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 11:10:34,805 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 11:10:34,806 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 11:10:34,806 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 11:10:34,806 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 11:10:34,806 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 11:10:34,806 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 11:10:34,806 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 11:10:34,806 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 11:10:34,806 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 11:10:34,807 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 11:10:34,807 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 11:10:34,807 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 11:10:34,807 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 11:10:34,807 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 11:10:34,807 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 11:10:34,807 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 11:10:34,807 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 11:10:34,807 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 11:10:34,807 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 11:10:34,808 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 11:10:34,808 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 11:10:34,808 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 11:10:34,808 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 11:10:34,808 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 11:10:34,808 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 11:10:34,808 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 11:10:34,808 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 11:10:34,808 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 11:10:34,808 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 11:10:34,808 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 11:10:34,809 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> EqDomain [2023-04-01 11:10:34,963 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 11:10:34,978 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 11:10:34,980 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 11:10:34,980 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 11:10:34,981 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 11:10:34,982 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops-crafted-1/nested_delay_nd.c [2023-04-01 11:10:36,032 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 11:10:36,179 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 11:10:36,180 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/nested_delay_nd.c [2023-04-01 11:10:36,184 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c635edc75/a2852249cbc74c4ca7e963b866700293/FLAGc276bd5a9 [2023-04-01 11:10:36,193 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c635edc75/a2852249cbc74c4ca7e963b866700293 [2023-04-01 11:10:36,195 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 11:10:36,195 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 11:10:36,196 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 11:10:36,196 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 11:10:36,203 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 11:10:36,203 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 11:10:36" (1/1) ... [2023-04-01 11:10:36,204 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2e5ad8b9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:10:36, skipping insertion in model container [2023-04-01 11:10:36,204 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 11:10:36" (1/1) ... [2023-04-01 11:10:36,211 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 11:10:36,224 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 11:10:36,330 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] [2023-04-01 11:10:36,341 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 11:10:36,349 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 11:10:36,357 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] [2023-04-01 11:10:36,361 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 11:10:36,372 INFO L208 MainTranslator]: Completed translation [2023-04-01 11:10:36,373 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:10:36 WrapperNode [2023-04-01 11:10:36,373 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 11:10:36,374 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 11:10:36,374 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 11:10:36,374 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 11:10:36,381 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:10:36" (1/1) ... [2023-04-01 11:10:36,381 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:10:36" (1/1) ... [2023-04-01 11:10:36,385 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:10:36" (1/1) ... [2023-04-01 11:10:36,385 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:10:36" (1/1) ... [2023-04-01 11:10:36,388 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:10:36" (1/1) ... [2023-04-01 11:10:36,390 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:10:36" (1/1) ... [2023-04-01 11:10:36,391 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:10:36" (1/1) ... [2023-04-01 11:10:36,392 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:10:36" (1/1) ... [2023-04-01 11:10:36,393 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 11:10:36,393 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 11:10:36,394 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 11:10:36,394 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 11:10:36,394 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:10:36" (1/1) ... [2023-04-01 11:10:36,399 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 11:10:36,406 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:10:36,416 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-01 11:10:36,422 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-01 11:10:36,441 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 11:10:36,441 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 11:10:36,441 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 11:10:36,441 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-01 11:10:36,441 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-01 11:10:36,441 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 11:10:36,442 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 11:10:36,442 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 11:10:36,442 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 11:10:36,442 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 11:10:36,442 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-01 11:10:36,442 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 11:10:36,442 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 11:10:36,442 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 11:10:36,442 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 11:10:36,442 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 11:10:36,443 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 11:10:36,443 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 11:10:36,443 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 11:10:36,443 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 11:10:36,500 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 11:10:36,501 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 11:10:36,625 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 11:10:36,716 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 11:10:36,716 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-04-01 11:10:36,718 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 11:10:36 BoogieIcfgContainer [2023-04-01 11:10:36,718 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 11:10:36,719 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 11:10:36,719 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 11:10:36,722 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 11:10:36,722 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 11:10:36" (1/3) ... [2023-04-01 11:10:36,723 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6edf257 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 11:10:36, skipping insertion in model container [2023-04-01 11:10:36,723 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:10:36" (2/3) ... [2023-04-01 11:10:36,723 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6edf257 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 11:10:36, skipping insertion in model container [2023-04-01 11:10:36,723 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 11:10:36" (3/3) ... [2023-04-01 11:10:36,724 INFO L112 eAbstractionObserver]: Analyzing ICFG nested_delay_nd.c [2023-04-01 11:10:36,738 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 11:10:36,738 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 11:10:36,780 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 11:10:36,786 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;@1eb85061, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 11:10:36,786 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 11:10:36,790 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) [2023-04-01 11:10:36,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-04-01 11:10:36,795 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:10:36,795 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:10:36,796 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:10:36,802 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:10:36,802 INFO L85 PathProgramCache]: Analyzing trace with hash -1065726219, now seen corresponding path program 1 times [2023-04-01 11:10:36,811 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:10:36,811 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [612272642] [2023-04-01 11:10:36,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:10:36,812 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:10:36,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:10:37,074 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:10:37,074 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:10:37,075 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [612272642] [2023-04-01 11:10:37,075 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [612272642] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 11:10:37,075 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 11:10:37,078 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-01 11:10:37,079 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1152097267] [2023-04-01 11:10:37,080 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 11:10:37,082 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-01 11:10:37,082 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:10:37,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-01 11:10:37,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-01 11:10:37,119 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) [2023-04-01 11:10:37,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:10:37,224 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2023-04-01 11:10:37,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-01 11:10:37,227 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 [2023-04-01 11:10:37,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:10:37,230 INFO L225 Difference]: With dead ends: 32 [2023-04-01 11:10:37,230 INFO L226 Difference]: Without dead ends: 20 [2023-04-01 11:10:37,232 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-01 11:10:37,234 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 12 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s 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, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 11:10:37,239 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 23 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 11:10:37,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-04-01 11:10:37,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2023-04-01 11:10:37,258 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) [2023-04-01 11:10:37,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2023-04-01 11:10:37,259 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 15 [2023-04-01 11:10:37,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:10:37,260 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2023-04-01 11:10:37,260 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) [2023-04-01 11:10:37,260 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2023-04-01 11:10:37,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-04-01 11:10:37,260 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:10:37,260 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:10:37,261 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 11:10:37,261 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:10:37,261 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:10:37,261 INFO L85 PathProgramCache]: Analyzing trace with hash 1059406511, now seen corresponding path program 1 times [2023-04-01 11:10:37,261 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:10:37,262 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1653339437] [2023-04-01 11:10:37,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:10:37,262 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:10:37,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:10:37,356 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:10:37,356 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:10:37,357 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1653339437] [2023-04-01 11:10:37,357 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1653339437] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:10:37,357 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [633634596] [2023-04-01 11:10:37,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:10:37,357 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:10:37,357 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:10:37,366 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 11:10:37,367 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-01 11:10:37,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:10:37,422 INFO L262 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-01 11:10:37,425 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:10:37,482 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:10:37,482 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:10:37,540 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:10:37,543 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [633634596] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:10:37,543 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1949432532] [2023-04-01 11:10:37,583 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 11:10:37,584 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:10:37,586 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:10:37,589 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:10:37,591 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:10:37,721 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 50 for LOIs [2023-04-01 11:10:38,144 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 82 for LOIs [2023-04-01 11:10:38,235 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2023-04-01 11:10:38,245 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 11:10:38,255 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:10:41,133 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 [2023-04-01 11:10:41,134 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:10:41,134 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:10:41,134 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2023-04-01 11:10:41,135 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900361431] [2023-04-01 11:10:41,135 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:10:41,135 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-04-01 11:10:41,135 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:10:41,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-04-01 11:10:41,136 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=411, Unknown=0, NotChecked=0, Total=506 [2023-04-01 11:10:41,137 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) [2023-04-01 11:10:41,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:10:41,201 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2023-04-01 11:10:41,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-01 11:10:41,202 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 [2023-04-01 11:10:41,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:10:41,202 INFO L225 Difference]: With dead ends: 33 [2023-04-01 11:10:41,202 INFO L226 Difference]: Without dead ends: 23 [2023-04-01 11:10:41,203 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=115, Invalid=485, Unknown=0, NotChecked=0, Total=600 [2023-04-01 11:10:41,204 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 [2023-04-01 11:10:41,204 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] [2023-04-01 11:10:41,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-04-01 11:10:41,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2023-04-01 11:10:41,207 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) [2023-04-01 11:10:41,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2023-04-01 11:10:41,207 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 16 [2023-04-01 11:10:41,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:10:41,207 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2023-04-01 11:10:41,208 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) [2023-04-01 11:10:41,208 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2023-04-01 11:10:41,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-04-01 11:10:41,208 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:10:41,208 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:10:41,215 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-04-01 11:10:41,413 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:10:41,413 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:10:41,414 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:10:41,414 INFO L85 PathProgramCache]: Analyzing trace with hash -1921618571, now seen corresponding path program 2 times [2023-04-01 11:10:41,414 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:10:41,414 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2027089793] [2023-04-01 11:10:41,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:10:41,414 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:10:41,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:10:41,545 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:10:41,546 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:10:41,546 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2027089793] [2023-04-01 11:10:41,546 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2027089793] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:10:41,546 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2089522296] [2023-04-01 11:10:41,546 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 11:10:41,546 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:10:41,546 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:10:41,547 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 11:10:41,550 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-01 11:10:41,602 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-01 11:10:41,602 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 11:10:41,603 INFO L262 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 7 conjunts are in the unsatisfiable core [2023-04-01 11:10:41,605 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:10:41,664 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:10:41,664 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:10:41,729 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:10:41,729 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2089522296] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:10:41,729 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1229334389] [2023-04-01 11:10:41,730 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 11:10:41,730 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:10:41,731 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:10:41,731 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:10:41,731 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:10:41,774 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 50 for LOIs [2023-04-01 11:10:42,001 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 82 for LOIs [2023-04-01 11:10:42,053 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2023-04-01 11:10:42,066 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 11:10:42,070 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:10:44,753 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 [2023-04-01 11:10:44,753 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:10:44,753 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:10:44,753 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 19 [2023-04-01 11:10:44,753 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [171460693] [2023-04-01 11:10:44,753 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:10:44,754 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-04-01 11:10:44,754 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:10:44,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-04-01 11:10:44,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=780, Unknown=0, NotChecked=0, Total=992 [2023-04-01 11:10:44,755 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) [2023-04-01 11:10:44,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:10:44,877 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2023-04-01 11:10:44,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-04-01 11:10:44,878 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 [2023-04-01 11:10:44,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:10:44,879 INFO L225 Difference]: With dead ends: 42 [2023-04-01 11:10:44,880 INFO L226 Difference]: Without dead ends: 29 [2023-04-01 11:10:44,880 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 559 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=292, Invalid=1040, Unknown=0, NotChecked=0, Total=1332 [2023-04-01 11:10:44,881 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 [2023-04-01 11:10:44,882 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] [2023-04-01 11:10:44,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-04-01 11:10:44,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2023-04-01 11:10:44,885 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) [2023-04-01 11:10:44,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2023-04-01 11:10:44,886 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 19 [2023-04-01 11:10:44,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:10:44,886 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2023-04-01 11:10:44,886 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) [2023-04-01 11:10:44,888 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2023-04-01 11:10:44,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-04-01 11:10:44,889 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:10:44,889 INFO L195 NwaCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:10:44,900 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-01 11:10:45,102 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-04-01 11:10:45,103 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:10:45,103 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:10:45,103 INFO L85 PathProgramCache]: Analyzing trace with hash -1571650763, now seen corresponding path program 3 times [2023-04-01 11:10:45,103 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:10:45,103 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2080793379] [2023-04-01 11:10:45,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:10:45,104 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:10:45,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:10:45,286 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:10:45,286 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:10:45,287 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2080793379] [2023-04-01 11:10:45,287 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2080793379] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:10:45,287 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [470886570] [2023-04-01 11:10:45,287 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 11:10:45,288 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:10:45,288 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:10:45,289 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 11:10:45,316 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-01 11:10:45,341 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 11:10:45,342 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 11:10:45,343 INFO L262 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 40 conjunts are in the unsatisfiable core [2023-04-01 11:10:45,345 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:10:46,427 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 45 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:10:46,427 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:10:47,391 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 28 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:10:47,391 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [470886570] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:10:47,391 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1251575713] [2023-04-01 11:10:47,392 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 11:10:47,392 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:10:47,392 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:10:47,393 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:10:47,393 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:10:47,418 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 50 for LOIs [2023-04-01 11:10:47,559 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 82 for LOIs [2023-04-01 11:10:47,605 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2023-04-01 11:10:47,610 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 11:10:47,613 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:10:50,735 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 [2023-04-01 11:10:50,735 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:10:50,735 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:10:50,735 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17, 17] total 44 [2023-04-01 11:10:50,735 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564268505] [2023-04-01 11:10:50,735 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:10:50,735 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2023-04-01 11:10:50,735 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:10:50,736 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2023-04-01 11:10:50,737 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=409, Invalid=2783, Unknown=0, NotChecked=0, Total=3192 [2023-04-01 11:10:50,737 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) [2023-04-01 11:10:58,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:10:58,688 INFO L93 Difference]: Finished difference Result 84 states and 95 transitions. [2023-04-01 11:10:58,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2023-04-01 11:10:58,688 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 [2023-04-01 11:10:58,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:10:58,689 INFO L225 Difference]: With dead ends: 84 [2023-04-01 11:10:58,689 INFO L226 Difference]: Without dead ends: 65 [2023-04-01 11:10:58,692 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2658 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=1415, Invalid=8284, Unknown=3, NotChecked=0, Total=9702 [2023-04-01 11:10:58,692 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 [2023-04-01 11:10:58,693 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] [2023-04-01 11:10:58,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2023-04-01 11:10:58,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2023-04-01 11:10:58,710 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) [2023-04-01 11:10:58,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 67 transitions. [2023-04-01 11:10:58,711 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 67 transitions. Word has length 25 [2023-04-01 11:10:58,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:10:58,711 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 67 transitions. [2023-04-01 11:10:58,712 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) [2023-04-01 11:10:58,712 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 67 transitions. [2023-04-01 11:10:58,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2023-04-01 11:10:58,713 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:10:58,713 INFO L195 NwaCegarLoop]: trace histogram [34, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:10:58,718 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-01 11:10:58,913 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:10:58,914 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:10:58,914 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:10:58,914 INFO L85 PathProgramCache]: Analyzing trace with hash -326581571, now seen corresponding path program 1 times [2023-04-01 11:10:58,914 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:10:58,914 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1897619850] [2023-04-01 11:10:58,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:10:58,914 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:10:58,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:10:59,191 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 306 proven. 66 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2023-04-01 11:10:59,191 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:10:59,192 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1897619850] [2023-04-01 11:10:59,192 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1897619850] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:10:59,192 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [437911636] [2023-04-01 11:10:59,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:10:59,192 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:10:59,192 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:10:59,193 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 11:10:59,195 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-01 11:10:59,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:10:59,262 INFO L262 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 14 conjunts are in the unsatisfiable core [2023-04-01 11:10:59,266 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:10:59,421 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 302 proven. 66 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2023-04-01 11:10:59,421 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:10:59,632 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 306 proven. 66 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2023-04-01 11:10:59,632 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [437911636] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:10:59,632 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1948672565] [2023-04-01 11:10:59,633 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 11:10:59,633 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:10:59,633 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:10:59,633 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:10:59,633 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:10:59,664 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 50 for LOIs [2023-04-01 11:11:00,005 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 10 [2023-04-01 11:11:00,033 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 82 for LOIs [2023-04-01 11:11:00,105 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2023-04-01 11:11:00,110 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 11:11:00,114 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:11:02,961 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 [2023-04-01 11:11:02,961 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:11:02,961 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:11:02,961 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 40 [2023-04-01 11:11:02,961 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1487414945] [2023-04-01 11:11:02,961 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:11:02,962 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2023-04-01 11:11:02,962 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:11:02,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2023-04-01 11:11:02,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=730, Invalid=2132, Unknown=0, NotChecked=0, Total=2862 [2023-04-01 11:11:02,964 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) [2023-04-01 11:11:03,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:11:03,323 INFO L93 Difference]: Finished difference Result 140 states and 187 transitions. [2023-04-01 11:11:03,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-04-01 11:11:03,324 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 [2023-04-01 11:11:03,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:11:03,325 INFO L225 Difference]: With dead ends: 140 [2023-04-01 11:11:03,325 INFO L226 Difference]: Without dead ends: 100 [2023-04-01 11:11:03,327 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1833 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=1078, Invalid=3212, Unknown=0, NotChecked=0, Total=4290 [2023-04-01 11:11:03,328 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 42 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s 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, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 11:11:03,329 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 51 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 11:11:03,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2023-04-01 11:11:03,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2023-04-01 11:11:03,347 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) [2023-04-01 11:11:03,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 104 transitions. [2023-04-01 11:11:03,348 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 104 transitions. Word has length 63 [2023-04-01 11:11:03,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:11:03,348 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 104 transitions. [2023-04-01 11:11:03,349 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) [2023-04-01 11:11:03,349 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 104 transitions. [2023-04-01 11:11:03,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2023-04-01 11:11:03,350 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:11:03,350 INFO L195 NwaCegarLoop]: trace histogram [72, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:11:03,363 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-01 11:11:03,557 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:11:03,558 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:11:03,558 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:11:03,558 INFO L85 PathProgramCache]: Analyzing trace with hash 1526004277, now seen corresponding path program 2 times [2023-04-01 11:11:03,559 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:11:03,559 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [454873970] [2023-04-01 11:11:03,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:11:03,559 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:11:03,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:11:04,340 INFO L134 CoverageAnalysis]: Checked inductivity of 2789 backedges. 1256 proven. 300 refuted. 0 times theorem prover too weak. 1233 trivial. 0 not checked. [2023-04-01 11:11:04,340 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:11:04,340 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [454873970] [2023-04-01 11:11:04,340 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [454873970] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:11:04,340 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [993086055] [2023-04-01 11:11:04,340 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 11:11:04,341 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:11:04,341 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:11:04,345 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 11:11:04,347 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-01 11:11:04,431 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2023-04-01 11:11:04,431 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 11:11:04,433 INFO L262 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 27 conjunts are in the unsatisfiable core [2023-04-01 11:11:04,435 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:11:04,907 INFO L134 CoverageAnalysis]: Checked inductivity of 2789 backedges. 1256 proven. 300 refuted. 0 times theorem prover too weak. 1233 trivial. 0 not checked. [2023-04-01 11:11:04,907 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:11:05,682 INFO L134 CoverageAnalysis]: Checked inductivity of 2789 backedges. 6 proven. 1550 refuted. 0 times theorem prover too weak. 1233 trivial. 0 not checked. [2023-04-01 11:11:05,683 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [993086055] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:11:05,683 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [144734443] [2023-04-01 11:11:05,685 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 11:11:05,685 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:11:05,685 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:11:05,685 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:11:05,685 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:11:05,712 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 50 for LOIs [2023-04-01 11:11:06,018 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 10 [2023-04-01 11:11:06,034 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 82 for LOIs [2023-04-01 11:11:06,097 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2023-04-01 11:11:06,102 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 11:11:06,105 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:11:09,086 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2725#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-01 11:11:09,086 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:11:09,086 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:11:09,086 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 79 [2023-04-01 11:11:09,086 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [868923815] [2023-04-01 11:11:09,086 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:11:09,087 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2023-04-01 11:11:09,087 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:11:09,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2023-04-01 11:11:09,089 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2758, Invalid=5798, Unknown=0, NotChecked=0, Total=8556 [2023-04-01 11:11:09,089 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) [2023-04-01 11:11:10,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:11:10,011 INFO L93 Difference]: Finished difference Result 243 states and 328 transitions. [2023-04-01 11:11:10,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2023-04-01 11:11:10,012 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 [2023-04-01 11:11:10,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:11:10,013 INFO L225 Difference]: With dead ends: 243 [2023-04-01 11:11:10,013 INFO L226 Difference]: Without dead ends: 178 [2023-04-01 11:11:10,016 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 239 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5707 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=4133, Invalid=9673, Unknown=0, NotChecked=0, Total=13806 [2023-04-01 11:11:10,017 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 2 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 11:11:10,018 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 59 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 11:11:10,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2023-04-01 11:11:10,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 178. [2023-04-01 11:11:10,041 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) [2023-04-01 11:11:10,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 182 transitions. [2023-04-01 11:11:10,042 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 182 transitions. Word has length 101 [2023-04-01 11:11:10,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:11:10,042 INFO L495 AbstractCegarLoop]: Abstraction has 178 states and 182 transitions. [2023-04-01 11:11:10,043 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) [2023-04-01 11:11:10,043 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 182 transitions. [2023-04-01 11:11:10,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2023-04-01 11:11:10,044 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:11:10,044 INFO L195 NwaCegarLoop]: trace histogram [150, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:11:10,052 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-04-01 11:11:10,244 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:11:10,245 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:11:10,245 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:11:10,245 INFO L85 PathProgramCache]: Analyzing trace with hash 1989884405, now seen corresponding path program 3 times [2023-04-01 11:11:10,245 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:11:10,245 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [793629794] [2023-04-01 11:11:10,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:11:10,245 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:11:10,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:11:12,364 INFO L134 CoverageAnalysis]: Checked inductivity of 11642 backedges. 5208 proven. 1275 refuted. 0 times theorem prover too weak. 5159 trivial. 0 not checked. [2023-04-01 11:11:12,364 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:11:12,364 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [793629794] [2023-04-01 11:11:12,364 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [793629794] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:11:12,364 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1546872517] [2023-04-01 11:11:12,364 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 11:11:12,364 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:11:12,365 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:11:12,365 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 11:11:12,366 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-01 11:11:12,510 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 11:11:12,511 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 11:11:12,524 WARN L260 TraceCheckSpWp]: Trace formula consists of 694 conjuncts, 431 conjunts are in the unsatisfiable core [2023-04-01 11:11:12,533 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:11:24,004 INFO L134 CoverageAnalysis]: Checked inductivity of 11642 backedges. 204 proven. 11385 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2023-04-01 11:11:24,004 INFO L327 TraceCheckSpWp]: Computing backward predicates...