/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/loop-acceleration/functions_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 11:03:58,126 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 11:03:58,128 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 11:03:58,157 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 11:03:58,158 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 11:03:58,159 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 11:03:58,162 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 11:03:58,163 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 11:03:58,164 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 11:03:58,168 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 11:03:58,169 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 11:03:58,170 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 11:03:58,170 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 11:03:58,172 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 11:03:58,173 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 11:03:58,173 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 11:03:58,174 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 11:03:58,174 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 11:03:58,176 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 11:03:58,179 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 11:03:58,180 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 11:03:58,181 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 11:03:58,181 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 11:03:58,182 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 11:03:58,188 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 11:03:58,188 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 11:03:58,188 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 11:03:58,189 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 11:03:58,189 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 11:03:58,190 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 11:03:58,190 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 11:03:58,190 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 11:03:58,191 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 11:03:58,192 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 11:03:58,192 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 11:03:58,192 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 11:03:58,193 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 11:03:58,193 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 11:03:58,193 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 11:03:58,193 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 11:03:58,194 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 11:03:58,195 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 11:03:58,217 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 11:03:58,217 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 11:03:58,217 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 11:03:58,217 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 11:03:58,218 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 11:03:58,218 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 11:03:58,218 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 11:03:58,218 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 11:03:58,219 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 11:03:58,219 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 11:03:58,219 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 11:03:58,219 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 11:03:58,219 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 11:03:58,219 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 11:03:58,220 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 11:03:58,220 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 11:03:58,220 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 11:03:58,220 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 11:03:58,221 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 11:03:58,221 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 11:03:58,221 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 11:03:58,221 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 11:03:58,221 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 11:03:58,221 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 11:03:58,221 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 11:03:58,222 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 11:03:58,222 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 11:03:58,222 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 11:03:58,222 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 11:03:58,222 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 11:03:58,222 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 11:03:58,222 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 11:03:58,223 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 11:03:58,223 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 11:03:58,223 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 11:03:58,223 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 11:03:58,223 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 11:03:58,223 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 11:03:58,223 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 11:03:58,223 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 11:03:58,223 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 11:03:58,223 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> EqDomain [2023-04-01 11:03:58,422 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 11:03:58,442 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 11:03:58,444 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 11:03:58,445 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 11:03:58,445 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 11:03:58,445 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-acceleration/functions_1-2.c [2023-04-01 11:03:59,390 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 11:03:59,517 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 11:03:59,517 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-acceleration/functions_1-2.c [2023-04-01 11:03:59,521 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a062389bf/c98a5be02d42484485202dec8fb633de/FLAG24c0d5029 [2023-04-01 11:03:59,531 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a062389bf/c98a5be02d42484485202dec8fb633de [2023-04-01 11:03:59,533 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 11:03:59,534 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 11:03:59,534 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 11:03:59,535 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 11:03:59,537 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 11:03:59,537 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 11:03:59" (1/1) ... [2023-04-01 11:03:59,538 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5b46ac1d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:03:59, skipping insertion in model container [2023-04-01 11:03:59,538 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 11:03:59" (1/1) ... [2023-04-01 11:03:59,542 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 11:03:59,550 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 11:03:59,631 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/loop-acceleration/functions_1-2.c[325,338] [2023-04-01 11:03:59,639 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 11:03:59,645 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 11:03:59,653 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/loop-acceleration/functions_1-2.c[325,338] [2023-04-01 11:03:59,654 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 11:03:59,663 INFO L208 MainTranslator]: Completed translation [2023-04-01 11:03:59,663 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:03:59 WrapperNode [2023-04-01 11:03:59,663 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 11:03:59,664 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 11:03:59,664 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 11:03:59,664 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 11:03:59,671 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:03:59" (1/1) ... [2023-04-01 11:03:59,671 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:03:59" (1/1) ... [2023-04-01 11:03:59,675 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:03:59" (1/1) ... [2023-04-01 11:03:59,675 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:03:59" (1/1) ... [2023-04-01 11:03:59,677 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:03:59" (1/1) ... [2023-04-01 11:03:59,679 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:03:59" (1/1) ... [2023-04-01 11:03:59,680 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:03:59" (1/1) ... [2023-04-01 11:03:59,680 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:03:59" (1/1) ... [2023-04-01 11:03:59,681 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 11:03:59,682 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 11:03:59,682 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 11:03:59,682 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 11:03:59,682 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:03:59" (1/1) ... [2023-04-01 11:03:59,686 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 11:03:59,693 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:03:59,712 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 11:03:59,718 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 11:03:59,742 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 11:03:59,742 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 11:03:59,742 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 11:03:59,744 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-01 11:03:59,744 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2023-04-01 11:03:59,744 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 11:03:59,744 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 11:03:59,744 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 11:03:59,744 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 11:03:59,744 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 11:03:59,744 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 11:03:59,744 INFO L130 BoogieDeclarations]: Found specification of procedure f [2023-04-01 11:03:59,744 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 11:03:59,745 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 11:03:59,745 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 11:03:59,745 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 11:03:59,745 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 11:03:59,745 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 11:03:59,745 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 11:03:59,794 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 11:03:59,795 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 11:03:59,912 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 11:03:59,932 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 11:03:59,932 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-04-01 11:03:59,950 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 11:03:59 BoogieIcfgContainer [2023-04-01 11:03:59,950 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 11:03:59,952 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 11:03:59,952 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 11:03:59,954 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 11:03:59,954 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 11:03:59" (1/3) ... [2023-04-01 11:03:59,954 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@21df5b0e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 11:03:59, skipping insertion in model container [2023-04-01 11:03:59,954 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:03:59" (2/3) ... [2023-04-01 11:03:59,955 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@21df5b0e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 11:03:59, skipping insertion in model container [2023-04-01 11:03:59,955 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 11:03:59" (3/3) ... [2023-04-01 11:03:59,956 INFO L112 eAbstractionObserver]: Analyzing ICFG functions_1-2.c [2023-04-01 11:03:59,984 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 11:03:59,984 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 11:04:00,027 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 11:04:00,032 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;@52ec799c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 11:04:00,032 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 11:04:00,036 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 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 11:04:00,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-04-01 11:04:00,041 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:04:00,041 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:04:00,042 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:04:00,047 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:04:00,048 INFO L85 PathProgramCache]: Analyzing trace with hash -463508279, now seen corresponding path program 1 times [2023-04-01 11:04:00,054 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:04:00,055 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1874541501] [2023-04-01 11:04:00,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:04:00,055 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:04:00,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:04:00,287 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 11:04:00,288 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:04:00,288 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1874541501] [2023-04-01 11:04:00,289 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1874541501] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 11:04:00,289 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 11:04:00,289 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 11:04:00,290 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400449402] [2023-04-01 11:04:00,291 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 11:04:00,294 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 11:04:00,295 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:04:00,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 11:04:00,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 11:04:00,317 INFO L87 Difference]: Start difference. First operand has 21 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 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 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:04:00,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:04:00,358 INFO L93 Difference]: Finished difference Result 35 states and 39 transitions. [2023-04-01 11:04:00,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 11:04:00,360 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2023-04-01 11:04:00,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:04:00,365 INFO L225 Difference]: With dead ends: 35 [2023-04-01 11:04:00,365 INFO L226 Difference]: Without dead ends: 18 [2023-04-01 11:04:00,367 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 11:04:00,369 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 1 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 11:04:00,370 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 30 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 11:04:00,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-04-01 11:04:00,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 16. [2023-04-01 11:04:00,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 9 states have internal predecessors, (10), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 11:04:00,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2023-04-01 11:04:00,399 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 10 [2023-04-01 11:04:00,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:04:00,400 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2023-04-01 11:04:00,400 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:04:00,400 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2023-04-01 11:04:00,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-04-01 11:04:00,402 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:04:00,402 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:04:00,402 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 11:04:00,402 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:04:00,403 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:04:00,403 INFO L85 PathProgramCache]: Analyzing trace with hash -1945748637, now seen corresponding path program 1 times [2023-04-01 11:04:00,403 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:04:00,404 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [779003527] [2023-04-01 11:04:00,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:04:00,404 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:04:00,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:04:00,578 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 11:04:00,578 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:04:00,578 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [779003527] [2023-04-01 11:04:00,579 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [779003527] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:04:00,579 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1031176521] [2023-04-01 11:04:00,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:04:00,579 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:04:00,579 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:04:00,591 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 11:04:00,593 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 11:04:00,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:04:00,661 INFO L262 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 13 conjunts are in the unsatisfiable core [2023-04-01 11:04:00,665 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:04:00,749 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 11:04:00,749 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:04:00,842 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 11:04:00,843 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1031176521] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:04:00,843 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [187841418] [2023-04-01 11:04:00,879 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-04-01 11:04:00,880 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:04:00,883 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:04:00,886 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:04:00,886 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:04:01,004 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 11:04:01,432 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 53 for LOIs [2023-04-01 11:04:01,453 INFO L197 IcfgInterpreter]: Interpreting procedure f with input of size 48 for LOIs [2023-04-01 11:04:01,459 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:04:01,462 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:04:02,168 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '200#(and (= (select |#length| 3) 12) (= 16 (select |#length| 2)) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (= |#NULL.base| 0))' at error location [2023-04-01 11:04:02,169 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:04:02,169 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:04:02,169 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-04-01 11:04:02,170 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354583006] [2023-04-01 11:04:02,170 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:04:02,170 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-04-01 11:04:02,170 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:04:02,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-04-01 11:04:02,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=435, Unknown=0, NotChecked=0, Total=506 [2023-04-01 11:04:02,172 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand has 12 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 10 states have internal predecessors, (17), 4 states have call successors, (5), 2 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-04-01 11:04:02,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:04:02,264 INFO L93 Difference]: Finished difference Result 28 states and 31 transitions. [2023-04-01 11:04:02,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-01 11:04:02,264 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 10 states have internal predecessors, (17), 4 states have call successors, (5), 2 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 15 [2023-04-01 11:04:02,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:04:02,265 INFO L225 Difference]: With dead ends: 28 [2023-04-01 11:04:02,265 INFO L226 Difference]: Without dead ends: 23 [2023-04-01 11:04:02,266 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=86, Invalid=514, Unknown=0, NotChecked=0, Total=600 [2023-04-01 11:04:02,267 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 3 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 11:04:02,268 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 52 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 11:04:02,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-04-01 11:04:02,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2023-04-01 11:04:02,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 13 states have (on average 1.0769230769230769) internal successors, (14), 13 states have internal predecessors, (14), 6 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 11:04:02,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2023-04-01 11:04:02,274 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 15 [2023-04-01 11:04:02,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:04:02,275 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2023-04-01 11:04:02,275 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 10 states have internal predecessors, (17), 4 states have call successors, (5), 2 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-04-01 11:04:02,275 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2023-04-01 11:04:02,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-04-01 11:04:02,276 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:04:02,277 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:04:02,284 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 11:04:02,481 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 11:04:02,482 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:04:02,482 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:04:02,482 INFO L85 PathProgramCache]: Analyzing trace with hash -1295297757, now seen corresponding path program 2 times [2023-04-01 11:04:02,482 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:04:02,484 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2052045286] [2023-04-01 11:04:02,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:04:02,485 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:04:02,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:04:02,703 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 11:04:02,704 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:04:02,704 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2052045286] [2023-04-01 11:04:02,704 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2052045286] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:04:02,704 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [959459177] [2023-04-01 11:04:02,704 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 11:04:02,704 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:04:02,705 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:04:02,705 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 11:04:02,751 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 11:04:02,778 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-01 11:04:02,778 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 11:04:02,779 INFO L262 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 33 conjunts are in the unsatisfiable core [2023-04-01 11:04:02,781 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:04:02,846 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 11:04:02,846 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:04:03,047 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 11:04:03,048 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [959459177] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:04:03,048 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1616180957] [2023-04-01 11:04:03,049 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-04-01 11:04:03,049 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:04:03,051 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:04:03,051 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:04:03,051 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:04:03,085 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 11:04:03,356 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 53 for LOIs [2023-04-01 11:04:03,372 INFO L197 IcfgInterpreter]: Interpreting procedure f with input of size 48 for LOIs [2023-04-01 11:04:03,376 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:04:03,379 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:04:04,154 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '465#(and (= (select |#length| 3) 12) (= 16 (select |#length| 2)) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (= |#NULL.base| 0))' at error location [2023-04-01 11:04:04,154 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:04:04,154 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:04:04,154 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 12] total 22 [2023-04-01 11:04:04,154 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1078083794] [2023-04-01 11:04:04,154 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:04:04,155 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-04-01 11:04:04,155 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:04:04,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-04-01 11:04:04,157 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=937, Unknown=0, NotChecked=0, Total=1056 [2023-04-01 11:04:04,157 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 22 states, 17 states have (on average 1.588235294117647) internal successors, (27), 16 states have internal predecessors, (27), 8 states have call successors, (9), 2 states have call predecessors, (9), 6 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2023-04-01 11:04:04,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:04:04,578 INFO L93 Difference]: Finished difference Result 40 states and 49 transitions. [2023-04-01 11:04:04,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-04-01 11:04:04,578 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 17 states have (on average 1.588235294117647) internal successors, (27), 16 states have internal predecessors, (27), 8 states have call successors, (9), 2 states have call predecessors, (9), 6 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) Word has length 25 [2023-04-01 11:04:04,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:04:04,579 INFO L225 Difference]: With dead ends: 40 [2023-04-01 11:04:04,579 INFO L226 Difference]: Without dead ends: 35 [2023-04-01 11:04:04,580 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 53 SyntacticMatches, 3 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=218, Invalid=1422, Unknown=0, NotChecked=0, Total=1640 [2023-04-01 11:04:04,581 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 6 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 232 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 232 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 11:04:04,587 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 92 Invalid, 250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 232 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 11:04:04,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-04-01 11:04:04,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2023-04-01 11:04:04,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 21 states have (on average 1.0476190476190477) internal successors, (22), 21 states have internal predecessors, (22), 10 states have call successors, (10), 4 states have call predecessors, (10), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-04-01 11:04:04,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2023-04-01 11:04:04,597 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 25 [2023-04-01 11:04:04,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:04:04,597 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2023-04-01 11:04:04,598 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 17 states have (on average 1.588235294117647) internal successors, (27), 16 states have internal predecessors, (27), 8 states have call successors, (9), 2 states have call predecessors, (9), 6 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2023-04-01 11:04:04,598 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2023-04-01 11:04:04,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-04-01 11:04:04,598 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:04:04,599 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:04:04,617 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-04-01 11:04:04,803 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 11:04:04,803 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:04:04,804 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:04:04,804 INFO L85 PathProgramCache]: Analyzing trace with hash 1643213475, now seen corresponding path program 3 times [2023-04-01 11:04:04,804 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:04:04,804 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1523066836] [2023-04-01 11:04:04,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:04:04,805 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:04:04,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:04:05,169 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 6 proven. 70 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-04-01 11:04:05,169 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:04:05,170 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1523066836] [2023-04-01 11:04:05,170 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1523066836] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:04:05,170 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1774947664] [2023-04-01 11:04:05,170 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 11:04:05,170 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:04:05,170 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:04:05,171 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 11:04:05,173 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 11:04:05,223 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 11:04:05,223 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 11:04:05,224 WARN L260 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 73 conjunts are in the unsatisfiable core [2023-04-01 11:04:05,226 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:04:05,331 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-04-01 11:04:05,331 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:04:06,145 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-04-01 11:04:06,146 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1774947664] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:04:06,146 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [909842855] [2023-04-01 11:04:06,147 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-04-01 11:04:06,147 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:04:06,148 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:04:06,148 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:04:06,148 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:04:06,167 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 11:04:06,355 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 53 for LOIs [2023-04-01 11:04:06,370 INFO L197 IcfgInterpreter]: Interpreting procedure f with input of size 48 for LOIs [2023-04-01 11:04:06,373 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:04:06,376 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:04:07,295 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '922#(and (= (select |#length| 3) 12) (= 16 (select |#length| 2)) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (= |#NULL.base| 0))' at error location [2023-04-01 11:04:07,295 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:04:07,295 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:04:07,296 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 24] total 42 [2023-04-01 11:04:07,296 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1034880625] [2023-04-01 11:04:07,296 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:04:07,296 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2023-04-01 11:04:07,296 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:04:07,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2023-04-01 11:04:07,298 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=2493, Unknown=0, NotChecked=0, Total=2756 [2023-04-01 11:04:07,298 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 42 states, 33 states have (on average 1.4242424242424243) internal successors, (47), 28 states have internal predecessors, (47), 16 states have call successors, (17), 2 states have call predecessors, (17), 10 states have return successors, (16), 15 states have call predecessors, (16), 15 states have call successors, (16) [2023-04-01 11:04:11,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:04:11,693 INFO L93 Difference]: Finished difference Result 64 states and 85 transitions. [2023-04-01 11:04:11,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-04-01 11:04:11,694 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 33 states have (on average 1.4242424242424243) internal successors, (47), 28 states have internal predecessors, (47), 16 states have call successors, (17), 2 states have call predecessors, (17), 10 states have return successors, (16), 15 states have call predecessors, (16), 15 states have call successors, (16) Word has length 45 [2023-04-01 11:04:11,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:04:11,695 INFO L225 Difference]: With dead ends: 64 [2023-04-01 11:04:11,695 INFO L226 Difference]: Without dead ends: 59 [2023-04-01 11:04:11,697 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 101 SyntacticMatches, 7 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 971 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=722, Invalid=4534, Unknown=0, NotChecked=0, Total=5256 [2023-04-01 11:04:11,697 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 9 mSDsluCounter, 208 mSDsCounter, 0 mSdLazyCounter, 979 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 1070 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 979 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-04-01 11:04:11,697 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 224 Invalid, 1070 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 979 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-04-01 11:04:11,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2023-04-01 11:04:11,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2023-04-01 11:04:11,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 37 states have (on average 1.027027027027027) internal successors, (38), 37 states have internal predecessors, (38), 18 states have call successors, (18), 4 states have call predecessors, (18), 2 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2023-04-01 11:04:11,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 72 transitions. [2023-04-01 11:04:11,705 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 72 transitions. Word has length 45 [2023-04-01 11:04:11,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:04:11,706 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 72 transitions. [2023-04-01 11:04:11,706 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 33 states have (on average 1.4242424242424243) internal successors, (47), 28 states have internal predecessors, (47), 16 states have call successors, (17), 2 states have call predecessors, (17), 10 states have return successors, (16), 15 states have call predecessors, (16), 15 states have call successors, (16) [2023-04-01 11:04:11,706 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 72 transitions. [2023-04-01 11:04:11,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2023-04-01 11:04:11,707 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:04:11,707 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:04:11,713 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-04-01 11:04:11,908 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 11:04:11,908 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:04:11,908 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:04:11,909 INFO L85 PathProgramCache]: Analyzing trace with hash -1698860637, now seen corresponding path program 4 times [2023-04-01 11:04:11,909 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:04:11,909 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [301131351] [2023-04-01 11:04:11,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:04:11,909 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:04:11,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:04:13,129 INFO L134 CoverageAnalysis]: Checked inductivity of 540 backedges. 14 proven. 330 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2023-04-01 11:04:13,129 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:04:13,129 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [301131351] [2023-04-01 11:04:13,129 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [301131351] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:04:13,129 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [366977344] [2023-04-01 11:04:13,129 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 11:04:13,129 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:04:13,129 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:04:13,130 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 11:04:13,132 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 11:04:13,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:04:13,185 WARN L260 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 153 conjunts are in the unsatisfiable core [2023-04-01 11:04:13,188 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:04:13,425 INFO L134 CoverageAnalysis]: Checked inductivity of 540 backedges. 0 proven. 330 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2023-04-01 11:04:13,426 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:04:15,889 INFO L134 CoverageAnalysis]: Checked inductivity of 540 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2023-04-01 11:04:15,889 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [366977344] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:04:15,889 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1817713661] [2023-04-01 11:04:15,890 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-04-01 11:04:15,891 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:04:15,891 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:04:15,891 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:04:15,891 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:04:15,911 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 11:04:16,096 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 53 for LOIs [2023-04-01 11:04:16,108 INFO L197 IcfgInterpreter]: Interpreting procedure f with input of size 48 for LOIs [2023-04-01 11:04:16,111 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:04:16,113 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:04:17,372 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1763#(and (= (select |#length| 3) 12) (= 16 (select |#length| 2)) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (= |#NULL.base| 0))' at error location [2023-04-01 11:04:17,372 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:04:17,372 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:04:17,372 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 48] total 82 [2023-04-01 11:04:17,372 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [921588633] [2023-04-01 11:04:17,372 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:04:17,373 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2023-04-01 11:04:17,373 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:04:17,374 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2023-04-01 11:04:17,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=743, Invalid=7813, Unknown=0, NotChecked=0, Total=8556 [2023-04-01 11:04:17,376 INFO L87 Difference]: Start difference. First operand 58 states and 72 transitions. Second operand has 82 states, 65 states have (on average 1.3384615384615384) internal successors, (87), 52 states have internal predecessors, (87), 32 states have call successors, (33), 2 states have call predecessors, (33), 18 states have return successors, (32), 31 states have call predecessors, (32), 31 states have call successors, (32) [2023-04-01 11:05:04,556 WARN L223 SmtUtils]: Spent 5.11s on a formula simplification. DAG size of input: 97 DAG size of output: 17 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)