/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain IntervalDomain -i ../sv-benchmarks/c/eca-rers2012/Problem18_label39.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-03-31 22:27:32,303 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-03-31 22:27:32,305 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-03-31 22:27:32,336 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-03-31 22:27:32,337 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-03-31 22:27:32,339 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-03-31 22:27:32,341 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-03-31 22:27:32,343 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-03-31 22:27:32,344 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-03-31 22:27:32,347 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-03-31 22:27:32,348 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-03-31 22:27:32,349 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-03-31 22:27:32,349 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-03-31 22:27:32,352 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-03-31 22:27:32,353 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-03-31 22:27:32,354 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-03-31 22:27:32,354 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-03-31 22:27:32,355 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-03-31 22:27:32,356 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-03-31 22:27:32,360 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-03-31 22:27:32,361 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-03-31 22:27:32,362 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-03-31 22:27:32,363 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-03-31 22:27:32,364 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-03-31 22:27:32,370 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-03-31 22:27:32,373 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-03-31 22:27:32,374 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-03-31 22:27:32,375 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-03-31 22:27:32,375 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-03-31 22:27:32,376 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-03-31 22:27:32,376 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-03-31 22:27:32,376 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-03-31 22:27:32,376 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-03-31 22:27:32,376 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-03-31 22:27:32,377 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-03-31 22:27:32,378 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-03-31 22:27:32,379 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-03-31 22:27:32,405 INFO L113 SettingsManager]: Loading preferences was successful [2023-03-31 22:27:32,405 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-03-31 22:27:32,406 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-03-31 22:27:32,406 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-03-31 22:27:32,406 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-03-31 22:27:32,407 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-03-31 22:27:32,407 INFO L138 SettingsManager]: * User list type=DISABLED [2023-03-31 22:27:32,407 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-03-31 22:27:32,407 INFO L138 SettingsManager]: * Explicit value domain=true [2023-03-31 22:27:32,407 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-03-31 22:27:32,408 INFO L138 SettingsManager]: * Octagon Domain=false [2023-03-31 22:27:32,408 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-03-31 22:27:32,408 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-03-31 22:27:32,408 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-03-31 22:27:32,408 INFO L138 SettingsManager]: * Interval Domain=false [2023-03-31 22:27:32,408 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-03-31 22:27:32,408 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-03-31 22:27:32,408 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-03-31 22:27:32,409 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-03-31 22:27:32,409 INFO L138 SettingsManager]: * sizeof long=4 [2023-03-31 22:27:32,409 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-03-31 22:27:32,409 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-03-31 22:27:32,409 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-03-31 22:27:32,410 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-03-31 22:27:32,410 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-03-31 22:27:32,410 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-03-31 22:27:32,410 INFO L138 SettingsManager]: * sizeof long double=12 [2023-03-31 22:27:32,410 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-03-31 22:27:32,410 INFO L138 SettingsManager]: * Use constant arrays=true [2023-03-31 22:27:32,410 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-03-31 22:27:32,411 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-03-31 22:27:32,411 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-03-31 22:27:32,411 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 22:27:32,411 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-03-31 22:27:32,411 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-03-31 22:27:32,411 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-03-31 22:27:32,411 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-03-31 22:27:32,412 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-03-31 22:27:32,412 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-03-31 22:27:32,412 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-03-31 22:27:32,412 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-03-31 22:27:32,412 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> IntervalDomain [2023-03-31 22:27:32,609 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-03-31 22:27:32,625 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-03-31 22:27:32,627 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-03-31 22:27:32,628 INFO L271 PluginConnector]: Initializing CDTParser... [2023-03-31 22:27:32,629 INFO L275 PluginConnector]: CDTParser initialized [2023-03-31 22:27:32,630 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/eca-rers2012/Problem18_label39.c [2023-03-31 22:27:33,656 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-03-31 22:27:34,025 INFO L351 CDTParser]: Found 1 translation units. [2023-03-31 22:27:34,026 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem18_label39.c [2023-03-31 22:27:34,046 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8ea01a750/470b84555b014d3bb608e1ed71b537f1/FLAG2ce8d9ff0 [2023-03-31 22:27:34,061 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8ea01a750/470b84555b014d3bb608e1ed71b537f1 [2023-03-31 22:27:34,063 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-03-31 22:27:34,065 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-03-31 22:27:34,068 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-03-31 22:27:34,068 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-03-31 22:27:34,071 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-03-31 22:27:34,071 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 10:27:34" (1/1) ... [2023-03-31 22:27:34,072 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4df2aa8d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:27:34, skipping insertion in model container [2023-03-31 22:27:34,073 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 10:27:34" (1/1) ... [2023-03-31 22:27:34,078 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-03-31 22:27:34,146 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-03-31 22:27:34,286 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/eca-rers2012/Problem18_label39.c[1705,1718] [2023-03-31 22:27:34,819 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 22:27:34,830 INFO L203 MainTranslator]: Completed pre-run [2023-03-31 22:27:34,844 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/eca-rers2012/Problem18_label39.c[1705,1718] [2023-03-31 22:27:35,090 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 22:27:35,109 INFO L208 MainTranslator]: Completed translation [2023-03-31 22:27:35,109 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:27:35 WrapperNode [2023-03-31 22:27:35,109 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-03-31 22:27:35,110 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-03-31 22:27:35,110 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-03-31 22:27:35,110 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-03-31 22:27:35,127 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:27:35" (1/1) ... [2023-03-31 22:27:35,127 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:27:35" (1/1) ... [2023-03-31 22:27:35,163 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:27:35" (1/1) ... [2023-03-31 22:27:35,164 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:27:35" (1/1) ... [2023-03-31 22:27:35,217 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:27:35" (1/1) ... [2023-03-31 22:27:35,238 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:27:35" (1/1) ... [2023-03-31 22:27:35,249 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:27:35" (1/1) ... [2023-03-31 22:27:35,259 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:27:35" (1/1) ... [2023-03-31 22:27:35,275 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-03-31 22:27:35,277 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-03-31 22:27:35,277 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-03-31 22:27:35,277 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-03-31 22:27:35,278 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:27:35" (1/1) ... [2023-03-31 22:27:35,284 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 22:27:35,291 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:27:35,301 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-03-31 22:27:35,320 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-03-31 22:27:35,334 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-03-31 22:27:35,334 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-03-31 22:27:35,334 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-03-31 22:27:35,334 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2023-03-31 22:27:35,334 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2023-03-31 22:27:35,334 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output3 [2023-03-31 22:27:35,334 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-03-31 22:27:35,334 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2023-03-31 22:27:35,334 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2023-03-31 22:27:35,334 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output3 [2023-03-31 22:27:35,334 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-03-31 22:27:35,334 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-03-31 22:27:35,334 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-03-31 22:27:35,334 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-03-31 22:27:35,335 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-03-31 22:27:35,335 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2023-03-31 22:27:35,335 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-03-31 22:27:35,335 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-03-31 22:27:35,335 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-03-31 22:27:35,335 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-03-31 22:27:35,335 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-03-31 22:27:35,335 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-03-31 22:27:35,335 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-03-31 22:27:35,390 INFO L236 CfgBuilder]: Building ICFG [2023-03-31 22:27:35,391 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-03-31 22:27:37,838 INFO L277 CfgBuilder]: Performing block encoding [2023-03-31 22:27:44,254 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-03-31 22:27:44,255 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-03-31 22:27:44,257 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 10:27:44 BoogieIcfgContainer [2023-03-31 22:27:44,257 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-03-31 22:27:44,259 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-03-31 22:27:44,259 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-03-31 22:27:44,261 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-03-31 22:27:44,261 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.03 10:27:34" (1/3) ... [2023-03-31 22:27:44,262 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@676bd688 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 10:27:44, skipping insertion in model container [2023-03-31 22:27:44,262 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:27:35" (2/3) ... [2023-03-31 22:27:44,262 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@676bd688 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 10:27:44, skipping insertion in model container [2023-03-31 22:27:44,262 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 10:27:44" (3/3) ... [2023-03-31 22:27:44,263 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem18_label39.c [2023-03-31 22:27:44,275 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-03-31 22:27:44,276 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-03-31 22:27:44,320 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-03-31 22:27:44,326 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;@2650a9ad, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-03-31 22:27:44,326 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-03-31 22:27:44,333 INFO L276 IsEmpty]: Start isEmpty. Operand has 469 states, 457 states have (on average 1.9715536105032823) internal successors, (901), 458 states have internal predecessors, (901), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-03-31 22:27:44,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-03-31 22:27:44,338 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:27:44,338 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:27:44,339 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:27:44,344 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:27:44,345 INFO L85 PathProgramCache]: Analyzing trace with hash 314224899, now seen corresponding path program 1 times [2023-03-31 22:27:44,354 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:27:44,355 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [886651033] [2023-03-31 22:27:44,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:27:44,355 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:27:44,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:27:44,583 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 22:27:44,584 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:27:44,584 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [886651033] [2023-03-31 22:27:44,584 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [886651033] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 22:27:44,584 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 22:27:44,584 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-03-31 22:27:44,586 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1168194004] [2023-03-31 22:27:44,586 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 22:27:44,589 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-03-31 22:27:44,589 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:27:44,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-03-31 22:27:44,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 22:27:44,613 INFO L87 Difference]: Start difference. First operand has 469 states, 457 states have (on average 1.9715536105032823) internal successors, (901), 458 states have internal predecessors, (901), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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) [2023-03-31 22:27:46,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:27:46,495 INFO L93 Difference]: Finished difference Result 1393 states and 2727 transitions. [2023-03-31 22:27:46,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-03-31 22:27:46,497 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 11 [2023-03-31 22:27:46,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:27:46,520 INFO L225 Difference]: With dead ends: 1393 [2023-03-31 22:27:46,520 INFO L226 Difference]: Without dead ends: 921 [2023-03-31 22:27:46,526 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 22:27:46,528 INFO L413 NwaCegarLoop]: 346 mSDtfsCounter, 472 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 1402 mSolverCounterSat, 373 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 472 SdHoareTripleChecker+Valid, 366 SdHoareTripleChecker+Invalid, 1775 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 373 IncrementalHoareTripleChecker+Valid, 1402 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2023-03-31 22:27:46,529 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [472 Valid, 366 Invalid, 1775 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [373 Valid, 1402 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2023-03-31 22:27:46,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 921 states. [2023-03-31 22:27:46,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 921 to 919. [2023-03-31 22:27:46,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 919 states, 905 states have (on average 1.6209944751381216) internal successors, (1467), 905 states have internal predecessors, (1467), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (10), 6 states have call predecessors, (10), 6 states have call successors, (10) [2023-03-31 22:27:46,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 919 states to 919 states and 1484 transitions. [2023-03-31 22:27:46,611 INFO L78 Accepts]: Start accepts. Automaton has 919 states and 1484 transitions. Word has length 11 [2023-03-31 22:27:46,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:27:46,611 INFO L495 AbstractCegarLoop]: Abstraction has 919 states and 1484 transitions. [2023-03-31 22:27:46,611 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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) [2023-03-31 22:27:46,612 INFO L276 IsEmpty]: Start isEmpty. Operand 919 states and 1484 transitions. [2023-03-31 22:27:46,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-03-31 22:27:46,613 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:27:46,613 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:27:46,613 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-03-31 22:27:46,613 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:27:46,614 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:27:46,614 INFO L85 PathProgramCache]: Analyzing trace with hash 180016366, now seen corresponding path program 1 times [2023-03-31 22:27:46,614 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:27:46,614 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [373738862] [2023-03-31 22:27:46,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:27:46,614 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:27:46,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:27:46,783 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 22:27:46,784 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:27:46,784 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [373738862] [2023-03-31 22:27:46,784 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [373738862] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 22:27:46,784 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 22:27:46,784 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-03-31 22:27:46,784 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1592945858] [2023-03-31 22:27:46,784 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 22:27:46,785 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-03-31 22:27:46,785 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:27:46,786 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-03-31 22:27:46,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-03-31 22:27:46,786 INFO L87 Difference]: Start difference. First operand 919 states and 1484 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 3 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) [2023-03-31 22:27:49,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:27:49,330 INFO L93 Difference]: Finished difference Result 2797 states and 4545 transitions. [2023-03-31 22:27:49,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-03-31 22:27:49,331 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 3 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) Word has length 22 [2023-03-31 22:27:49,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:27:49,338 INFO L225 Difference]: With dead ends: 2797 [2023-03-31 22:27:49,339 INFO L226 Difference]: Without dead ends: 1883 [2023-03-31 22:27:49,344 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2023-03-31 22:27:49,347 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 1522 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 3163 mSolverCounterSat, 536 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1522 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 3699 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 536 IncrementalHoareTripleChecker+Valid, 3163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2023-03-31 22:27:49,350 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1522 Valid, 96 Invalid, 3699 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [536 Valid, 3163 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2023-03-31 22:27:49,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1883 states. [2023-03-31 22:27:49,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1883 to 1843. [2023-03-31 22:27:49,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1843 states, 1809 states have (on average 1.4151464897733554) internal successors, (2560), 1816 states have internal predecessors, (2560), 11 states have call successors, (11), 11 states have call predecessors, (11), 22 states have return successors, (54), 15 states have call predecessors, (54), 10 states have call successors, (54) [2023-03-31 22:27:49,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1843 states to 1843 states and 2625 transitions. [2023-03-31 22:27:49,409 INFO L78 Accepts]: Start accepts. Automaton has 1843 states and 2625 transitions. Word has length 22 [2023-03-31 22:27:49,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:27:49,410 INFO L495 AbstractCegarLoop]: Abstraction has 1843 states and 2625 transitions. [2023-03-31 22:27:49,410 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 3 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) [2023-03-31 22:27:49,410 INFO L276 IsEmpty]: Start isEmpty. Operand 1843 states and 2625 transitions. [2023-03-31 22:27:49,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-03-31 22:27:49,411 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:27:49,411 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:27:49,411 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-03-31 22:27:49,412 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:27:49,412 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:27:49,413 INFO L85 PathProgramCache]: Analyzing trace with hash 1478653208, now seen corresponding path program 1 times [2023-03-31 22:27:49,413 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:27:49,413 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1917890812] [2023-03-31 22:27:49,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:27:49,413 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:27:49,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:27:49,549 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-03-31 22:27:49,550 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:27:49,550 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1917890812] [2023-03-31 22:27:49,550 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1917890812] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:27:49,550 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1010984576] [2023-03-31 22:27:49,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:27:49,550 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:27:49,551 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:27:49,553 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 22:27:49,572 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-03-31 22:27:49,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:27:49,642 INFO L262 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 6 conjunts are in the unsatisfiable core [2023-03-31 22:27:49,645 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 22:27:49,706 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-03-31 22:27:49,707 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-03-31 22:27:49,707 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1010984576] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 22:27:49,707 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-03-31 22:27:49,707 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 8 [2023-03-31 22:27:49,707 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [761586590] [2023-03-31 22:27:49,707 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 22:27:49,707 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-03-31 22:27:49,708 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:27:49,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-03-31 22:27:49,708 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2023-03-31 22:27:49,708 INFO L87 Difference]: Start difference. First operand 1843 states and 2625 transitions. Second operand has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 22:27:52,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:27:52,084 INFO L93 Difference]: Finished difference Result 5615 states and 8143 transitions. [2023-03-31 22:27:52,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-03-31 22:27:52,089 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 32 [2023-03-31 22:27:52,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:27:52,110 INFO L225 Difference]: With dead ends: 5615 [2023-03-31 22:27:52,111 INFO L226 Difference]: Without dead ends: 3777 [2023-03-31 22:27:52,116 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2023-03-31 22:27:52,118 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 1574 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 2434 mSolverCounterSat, 1024 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1574 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 3458 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1024 IncrementalHoareTripleChecker+Valid, 2434 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2023-03-31 22:27:52,120 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1574 Valid, 59 Invalid, 3458 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1024 Valid, 2434 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2023-03-31 22:27:52,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3777 states. [2023-03-31 22:27:52,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3777 to 3658. [2023-03-31 22:27:52,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3658 states, 3573 states have (on average 1.2555275678701372) internal successors, (4486), 3601 states have internal predecessors, (4486), 19 states have call successors, (19), 19 states have call predecessors, (19), 65 states have return successors, (195), 37 states have call predecessors, (195), 18 states have call successors, (195) [2023-03-31 22:27:52,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3658 states to 3658 states and 4700 transitions. [2023-03-31 22:27:52,234 INFO L78 Accepts]: Start accepts. Automaton has 3658 states and 4700 transitions. Word has length 32 [2023-03-31 22:27:52,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:27:52,234 INFO L495 AbstractCegarLoop]: Abstraction has 3658 states and 4700 transitions. [2023-03-31 22:27:52,234 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 22:27:52,235 INFO L276 IsEmpty]: Start isEmpty. Operand 3658 states and 4700 transitions. [2023-03-31 22:27:52,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2023-03-31 22:27:52,236 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:27:52,236 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:27:52,258 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-03-31 22:27:52,441 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:27:52,442 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:27:52,443 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:27:52,443 INFO L85 PathProgramCache]: Analyzing trace with hash 1664914081, now seen corresponding path program 1 times [2023-03-31 22:27:52,443 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:27:52,443 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [571234558] [2023-03-31 22:27:52,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:27:52,443 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:27:52,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:27:52,555 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 22:27:52,556 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:27:52,556 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [571234558] [2023-03-31 22:27:52,556 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [571234558] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 22:27:52,556 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 22:27:52,556 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-03-31 22:27:52,558 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [77125171] [2023-03-31 22:27:52,558 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 22:27:52,559 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-03-31 22:27:52,559 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:27:52,560 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-03-31 22:27:52,560 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 22:27:52,561 INFO L87 Difference]: Start difference. First operand 3658 states and 4700 transitions. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-03-31 22:27:54,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:27:54,126 INFO L93 Difference]: Finished difference Result 9168 states and 12163 transitions. [2023-03-31 22:27:54,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-03-31 22:27:54,138 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 49 [2023-03-31 22:27:54,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:27:54,157 INFO L225 Difference]: With dead ends: 9168 [2023-03-31 22:27:54,157 INFO L226 Difference]: Without dead ends: 5515 [2023-03-31 22:27:54,169 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 [2023-03-31 22:27:54,172 INFO L413 NwaCegarLoop]: 818 mSDtfsCounter, 492 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 1162 mSolverCounterSat, 616 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 492 SdHoareTripleChecker+Valid, 839 SdHoareTripleChecker+Invalid, 1778 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 616 IncrementalHoareTripleChecker+Valid, 1162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2023-03-31 22:27:54,173 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [492 Valid, 839 Invalid, 1778 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [616 Valid, 1162 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2023-03-31 22:27:54,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5515 states. [2023-03-31 22:27:54,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5515 to 4958. [2023-03-31 22:27:54,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4958 states, 4846 states have (on average 1.2150226991333057) internal successors, (5888), 4883 states have internal predecessors, (5888), 25 states have call successors, (25), 25 states have call predecessors, (25), 86 states have return successors, (309), 49 states have call predecessors, (309), 24 states have call successors, (309) [2023-03-31 22:27:54,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4958 states to 4958 states and 6222 transitions. [2023-03-31 22:27:54,264 INFO L78 Accepts]: Start accepts. Automaton has 4958 states and 6222 transitions. Word has length 49 [2023-03-31 22:27:54,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:27:54,265 INFO L495 AbstractCegarLoop]: Abstraction has 4958 states and 6222 transitions. [2023-03-31 22:27:54,265 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-03-31 22:27:54,265 INFO L276 IsEmpty]: Start isEmpty. Operand 4958 states and 6222 transitions. [2023-03-31 22:27:54,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2023-03-31 22:27:54,274 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:27:54,274 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:27:54,274 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-03-31 22:27:54,274 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:27:54,275 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:27:54,275 INFO L85 PathProgramCache]: Analyzing trace with hash 240238913, now seen corresponding path program 1 times [2023-03-31 22:27:54,275 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:27:54,275 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [737422484] [2023-03-31 22:27:54,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:27:54,275 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:27:54,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:27:54,616 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 65 proven. 27 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-03-31 22:27:54,617 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:27:54,617 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [737422484] [2023-03-31 22:27:54,617 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [737422484] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:27:54,620 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1091946000] [2023-03-31 22:27:54,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:27:54,620 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:27:54,621 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:27:54,622 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 22:27:54,624 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-03-31 22:27:54,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:27:54,739 INFO L262 TraceCheckSpWp]: Trace formula consists of 581 conjuncts, 4 conjunts are in the unsatisfiable core [2023-03-31 22:27:54,744 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 22:27:54,855 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 109 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-03-31 22:27:54,855 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 22:27:55,036 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 65 proven. 27 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-03-31 22:27:55,036 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1091946000] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 22:27:55,036 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1380800014] [2023-03-31 22:27:55,056 INFO L159 IcfgInterpreter]: Started Sifa with 70 locations of interest [2023-03-31 22:27:55,056 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 22:27:55,059 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 22:27:55,062 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 22:27:55,063 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 22:27:55,178 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 44 for LOIs [2023-03-31 22:27:55,256 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 7 [2023-03-31 22:27:55,341 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 54 [2023-03-31 22:27:56,344 INFO L197 IcfgInterpreter]: Interpreting procedure calculate_output with input of size 42 for LOIs [2023-03-31 22:27:56,358 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 7 [2023-03-31 22:27:56,669 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 54 [2023-03-31 22:27:58,442 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 48609 conjuctions. This might take some time... [2023-03-31 22:28:01,203 INFO L192 XnfTransformerHelper]: Simplified to disjunction of 429 conjuctions.