/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_label00.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-03-31 22:24:27,331 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-03-31 22:24:27,333 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-03-31 22:24:27,367 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-03-31 22:24:27,368 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-03-31 22:24:27,371 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-03-31 22:24:27,375 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-03-31 22:24:27,376 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-03-31 22:24:27,378 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-03-31 22:24:27,382 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-03-31 22:24:27,383 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-03-31 22:24:27,384 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-03-31 22:24:27,385 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-03-31 22:24:27,387 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-03-31 22:24:27,389 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-03-31 22:24:27,392 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-03-31 22:24:27,393 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-03-31 22:24:27,393 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-03-31 22:24:27,395 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-03-31 22:24:27,400 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-03-31 22:24:27,401 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-03-31 22:24:27,402 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-03-31 22:24:27,403 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-03-31 22:24:27,404 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-03-31 22:24:27,408 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-03-31 22:24:27,412 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-03-31 22:24:27,412 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-03-31 22:24:27,414 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-03-31 22:24:27,414 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-03-31 22:24:27,415 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-03-31 22:24:27,415 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-03-31 22:24:27,415 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-03-31 22:24:27,415 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-03-31 22:24:27,416 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-03-31 22:24:27,416 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-03-31 22:24:27,417 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-03-31 22:24:27,418 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 22:24:27,457 INFO L113 SettingsManager]: Loading preferences was successful [2023-03-31 22:24:27,457 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-03-31 22:24:27,458 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-03-31 22:24:27,458 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-03-31 22:24:27,459 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-03-31 22:24:27,459 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-03-31 22:24:27,459 INFO L138 SettingsManager]: * User list type=DISABLED [2023-03-31 22:24:27,459 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-03-31 22:24:27,459 INFO L138 SettingsManager]: * Explicit value domain=true [2023-03-31 22:24:27,459 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-03-31 22:24:27,459 INFO L138 SettingsManager]: * Octagon Domain=false [2023-03-31 22:24:27,459 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-03-31 22:24:27,460 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-03-31 22:24:27,460 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-03-31 22:24:27,460 INFO L138 SettingsManager]: * Interval Domain=false [2023-03-31 22:24:27,460 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-03-31 22:24:27,460 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-03-31 22:24:27,460 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-03-31 22:24:27,461 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-03-31 22:24:27,461 INFO L138 SettingsManager]: * sizeof long=4 [2023-03-31 22:24:27,461 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-03-31 22:24:27,461 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-03-31 22:24:27,461 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-03-31 22:24:27,461 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-03-31 22:24:27,462 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-03-31 22:24:27,462 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-03-31 22:24:27,462 INFO L138 SettingsManager]: * sizeof long double=12 [2023-03-31 22:24:27,463 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-03-31 22:24:27,463 INFO L138 SettingsManager]: * Use constant arrays=true [2023-03-31 22:24:27,463 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-03-31 22:24:27,463 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-03-31 22:24:27,463 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-03-31 22:24:27,463 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 22:24:27,463 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-03-31 22:24:27,464 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-03-31 22:24:27,464 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-03-31 22:24:27,464 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-03-31 22:24:27,464 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-03-31 22:24:27,464 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-03-31 22:24:27,464 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-03-31 22:24:27,464 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-03-31 22:24:27,464 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> IntervalDomain [2023-03-31 22:24:27,679 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-03-31 22:24:27,704 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-03-31 22:24:27,706 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-03-31 22:24:27,708 INFO L271 PluginConnector]: Initializing CDTParser... [2023-03-31 22:24:27,708 INFO L275 PluginConnector]: CDTParser initialized [2023-03-31 22:24:27,710 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/eca-rers2012/Problem18_label00.c [2023-03-31 22:24:28,898 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-03-31 22:24:29,287 INFO L351 CDTParser]: Found 1 translation units. [2023-03-31 22:24:29,288 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem18_label00.c [2023-03-31 22:24:29,314 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d851bf46f/8bcfe8da84184af980dce70987700840/FLAG6355c7e9a [2023-03-31 22:24:29,330 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d851bf46f/8bcfe8da84184af980dce70987700840 [2023-03-31 22:24:29,332 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-03-31 22:24:29,334 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-03-31 22:24:29,337 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-03-31 22:24:29,337 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-03-31 22:24:29,340 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-03-31 22:24:29,340 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 10:24:29" (1/1) ... [2023-03-31 22:24:29,342 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@efc1b49 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:24:29, skipping insertion in model container [2023-03-31 22:24:29,342 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 10:24:29" (1/1) ... [2023-03-31 22:24:29,348 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-03-31 22:24:29,440 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-03-31 22:24:29,609 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_label00.c[2299,2312] [2023-03-31 22:24:30,237 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 22:24:30,247 INFO L203 MainTranslator]: Completed pre-run [2023-03-31 22:24:30,269 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_label00.c[2299,2312] [2023-03-31 22:24:30,619 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 22:24:30,639 INFO L208 MainTranslator]: Completed translation [2023-03-31 22:24:30,640 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:24:30 WrapperNode [2023-03-31 22:24:30,640 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-03-31 22:24:30,641 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-03-31 22:24:30,642 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-03-31 22:24:30,665 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-03-31 22:24:30,674 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:24:30" (1/1) ... [2023-03-31 22:24:30,675 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:24:30" (1/1) ... [2023-03-31 22:24:30,713 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:24:30" (1/1) ... [2023-03-31 22:24:30,714 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:24:30" (1/1) ... [2023-03-31 22:24:30,786 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:24:30" (1/1) ... [2023-03-31 22:24:30,803 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:24:30" (1/1) ... [2023-03-31 22:24:30,834 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:24:30" (1/1) ... [2023-03-31 22:24:30,843 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:24:30" (1/1) ... [2023-03-31 22:24:30,868 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-03-31 22:24:30,869 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-03-31 22:24:30,869 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-03-31 22:24:30,869 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-03-31 22:24:30,870 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:24:30" (1/1) ... [2023-03-31 22:24:30,875 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 22:24:30,883 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:24:30,898 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 22:24:30,910 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 22:24:30,934 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-03-31 22:24:30,934 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-03-31 22:24:30,934 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-03-31 22:24:30,934 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2023-03-31 22:24:30,934 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2023-03-31 22:24:30,934 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output3 [2023-03-31 22:24:30,935 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-03-31 22:24:30,935 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2023-03-31 22:24:30,935 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2023-03-31 22:24:30,935 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output3 [2023-03-31 22:24:30,935 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-03-31 22:24:30,935 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-03-31 22:24:30,935 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-03-31 22:24:30,935 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-03-31 22:24:30,935 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-03-31 22:24:30,935 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2023-03-31 22:24:30,935 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-03-31 22:24:30,935 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-03-31 22:24:30,935 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-03-31 22:24:30,936 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-03-31 22:24:30,936 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-03-31 22:24:30,936 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-03-31 22:24:30,936 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-03-31 22:24:30,997 INFO L236 CfgBuilder]: Building ICFG [2023-03-31 22:24:30,999 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-03-31 22:24:33,867 INFO L277 CfgBuilder]: Performing block encoding [2023-03-31 22:24:41,151 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-03-31 22:24:41,151 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-03-31 22:24:41,155 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 10:24:41 BoogieIcfgContainer [2023-03-31 22:24:41,155 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-03-31 22:24:41,157 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-03-31 22:24:41,157 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-03-31 22:24:41,160 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-03-31 22:24:41,160 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.03 10:24:29" (1/3) ... [2023-03-31 22:24:41,160 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a0a4b58 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 10:24:41, skipping insertion in model container [2023-03-31 22:24:41,160 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:24:30" (2/3) ... [2023-03-31 22:24:41,161 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a0a4b58 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 10:24:41, skipping insertion in model container [2023-03-31 22:24:41,161 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 10:24:41" (3/3) ... [2023-03-31 22:24:41,162 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem18_label00.c [2023-03-31 22:24:41,178 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-03-31 22:24:41,179 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-03-31 22:24:41,247 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-03-31 22:24:41,253 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;@55ad7dbd, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-03-31 22:24:41,253 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-03-31 22:24:41,261 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 22:24:41,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-03-31 22:24:41,268 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:24:41,269 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:24:41,270 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:24:41,275 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:24:41,275 INFO L85 PathProgramCache]: Analyzing trace with hash 314226435, now seen corresponding path program 1 times [2023-03-31 22:24:41,284 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:24:41,284 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1018184455] [2023-03-31 22:24:41,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:24:41,285 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:24:41,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:24:41,567 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 22:24:41,568 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:24:41,569 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1018184455] [2023-03-31 22:24:41,570 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1018184455] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 22:24:41,570 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 22:24:41,571 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-03-31 22:24:41,572 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485743648] [2023-03-31 22:24:41,573 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 22:24:41,576 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-03-31 22:24:41,577 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:24:41,621 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-03-31 22:24:41,625 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 22:24:41,628 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 22:24:43,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:24:43,610 INFO L93 Difference]: Finished difference Result 1393 states and 2727 transitions. [2023-03-31 22:24:43,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-03-31 22:24:43,612 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 22:24:43,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:24:43,629 INFO L225 Difference]: With dead ends: 1393 [2023-03-31 22:24:43,630 INFO L226 Difference]: Without dead ends: 921 [2023-03-31 22:24:43,637 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 22:24:43,640 INFO L413 NwaCegarLoop]: 346 mSDtfsCounter, 472 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 1402 mSolverCounterSat, 373 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s 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, 1.9s IncrementalHoareTripleChecker+Time [2023-03-31 22:24:43,641 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [472 Valid, 366 Invalid, 1775 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [373 Valid, 1402 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2023-03-31 22:24:43,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 921 states. [2023-03-31 22:24:43,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 921 to 919. [2023-03-31 22:24:43,718 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 22:24:43,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 919 states to 919 states and 1484 transitions. [2023-03-31 22:24:43,723 INFO L78 Accepts]: Start accepts. Automaton has 919 states and 1484 transitions. Word has length 11 [2023-03-31 22:24:43,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:24:43,724 INFO L495 AbstractCegarLoop]: Abstraction has 919 states and 1484 transitions. [2023-03-31 22:24:43,724 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 22:24:43,724 INFO L276 IsEmpty]: Start isEmpty. Operand 919 states and 1484 transitions. [2023-03-31 22:24:43,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-03-31 22:24:43,725 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:24:43,726 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 22:24:43,726 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-03-31 22:24:43,726 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:24:43,727 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:24:43,727 INFO L85 PathProgramCache]: Analyzing trace with hash -1018424546, now seen corresponding path program 1 times [2023-03-31 22:24:43,727 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:24:43,727 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1220967159] [2023-03-31 22:24:43,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:24:43,727 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:24:43,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:24:43,989 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 22:24:43,990 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:24:43,990 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1220967159] [2023-03-31 22:24:43,990 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1220967159] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 22:24:43,990 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 22:24:43,990 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-03-31 22:24:43,990 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947905124] [2023-03-31 22:24:43,991 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 22:24:43,993 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-03-31 22:24:43,993 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:24:43,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-03-31 22:24:43,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-03-31 22:24:43,994 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 22:24:47,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:24:47,090 INFO L93 Difference]: Finished difference Result 2797 states and 4545 transitions. [2023-03-31 22:24:47,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-03-31 22:24:47,093 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 22:24:47,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:24:47,102 INFO L225 Difference]: With dead ends: 2797 [2023-03-31 22:24:47,103 INFO L226 Difference]: Without dead ends: 1883 [2023-03-31 22:24:47,105 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 22:24:47,106 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 1522 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 3163 mSolverCounterSat, 536 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s 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, 3.0s IncrementalHoareTripleChecker+Time [2023-03-31 22:24:47,106 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1522 Valid, 96 Invalid, 3699 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [536 Valid, 3163 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2023-03-31 22:24:47,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1883 states. [2023-03-31 22:24:47,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1883 to 1843. [2023-03-31 22:24:47,160 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 22:24:47,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1843 states to 1843 states and 2625 transitions. [2023-03-31 22:24:47,168 INFO L78 Accepts]: Start accepts. Automaton has 1843 states and 2625 transitions. Word has length 22 [2023-03-31 22:24:47,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:24:47,168 INFO L495 AbstractCegarLoop]: Abstraction has 1843 states and 2625 transitions. [2023-03-31 22:24:47,168 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 22:24:47,168 INFO L276 IsEmpty]: Start isEmpty. Operand 1843 states and 2625 transitions. [2023-03-31 22:24:47,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-03-31 22:24:47,169 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:24:47,170 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 22:24:47,170 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-03-31 22:24:47,170 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:24:47,170 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:24:47,170 INFO L85 PathProgramCache]: Analyzing trace with hash -100634760, now seen corresponding path program 1 times [2023-03-31 22:24:47,171 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:24:47,171 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [885530872] [2023-03-31 22:24:47,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:24:47,171 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:24:47,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:24:47,390 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 22:24:47,390 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:24:47,390 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [885530872] [2023-03-31 22:24:47,390 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [885530872] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:24:47,392 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1586930631] [2023-03-31 22:24:47,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:24:47,392 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:24:47,392 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:24:47,399 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 22:24:47,403 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 22:24:47,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:24:47,495 INFO L262 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 6 conjunts are in the unsatisfiable core [2023-03-31 22:24:47,499 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 22:24:47,693 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 22:24:47,693 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-03-31 22:24:47,693 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1586930631] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 22:24:47,693 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-03-31 22:24:47,694 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 8 [2023-03-31 22:24:47,694 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471025551] [2023-03-31 22:24:47,694 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 22:24:47,694 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-03-31 22:24:47,694 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:24:47,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-03-31 22:24:47,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2023-03-31 22:24:47,695 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 22:24:50,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:24:50,903 INFO L93 Difference]: Finished difference Result 5615 states and 8143 transitions. [2023-03-31 22:24:50,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-03-31 22:24:50,904 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 22:24:50,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:24:50,978 INFO L225 Difference]: With dead ends: 5615 [2023-03-31 22:24:50,979 INFO L226 Difference]: Without dead ends: 3777 [2023-03-31 22:24:50,982 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2023-03-31 22:24:50,983 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 1574 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 2434 mSolverCounterSat, 1024 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s 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, 3.0s IncrementalHoareTripleChecker+Time [2023-03-31 22:24:50,984 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1574 Valid, 59 Invalid, 3458 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1024 Valid, 2434 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2023-03-31 22:24:50,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3777 states. [2023-03-31 22:24:51,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3777 to 3658. [2023-03-31 22:24:51,070 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 22:24:51,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3658 states to 3658 states and 4700 transitions. [2023-03-31 22:24:51,085 INFO L78 Accepts]: Start accepts. Automaton has 3658 states and 4700 transitions. Word has length 32 [2023-03-31 22:24:51,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:24:51,086 INFO L495 AbstractCegarLoop]: Abstraction has 3658 states and 4700 transitions. [2023-03-31 22:24:51,086 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 22:24:51,086 INFO L276 IsEmpty]: Start isEmpty. Operand 3658 states and 4700 transitions. [2023-03-31 22:24:51,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2023-03-31 22:24:51,089 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:24:51,089 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 22:24:51,098 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-03-31 22:24:51,295 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 22:24:51,295 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:24:51,296 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:24:51,296 INFO L85 PathProgramCache]: Analyzing trace with hash -1193688463, now seen corresponding path program 1 times [2023-03-31 22:24:51,296 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:24:51,296 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1684968223] [2023-03-31 22:24:51,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:24:51,296 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:24:51,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:24:51,404 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 22:24:51,405 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:24:51,405 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1684968223] [2023-03-31 22:24:51,405 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1684968223] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 22:24:51,405 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 22:24:51,405 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-03-31 22:24:51,406 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004904260] [2023-03-31 22:24:51,407 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 22:24:51,408 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-03-31 22:24:51,408 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:24:51,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-03-31 22:24:51,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 22:24:51,409 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 22:24:55,143 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-03-31 22:24:55,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:24:55,481 INFO L93 Difference]: Finished difference Result 10467 states and 13788 transitions. [2023-03-31 22:24:55,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-03-31 22:24:55,489 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 22:24:55,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:24:55,520 INFO L225 Difference]: With dead ends: 10467 [2023-03-31 22:24:55,520 INFO L226 Difference]: Without dead ends: 6814 [2023-03-31 22:24:55,528 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 22:24:55,532 INFO L413 NwaCegarLoop]: 896 mSDtfsCounter, 448 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 1321 mSolverCounterSat, 525 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 448 SdHoareTripleChecker+Valid, 918 SdHoareTripleChecker+Invalid, 1847 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 525 IncrementalHoareTripleChecker+Valid, 1321 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2023-03-31 22:24:55,533 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [448 Valid, 918 Invalid, 1847 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [525 Valid, 1321 Invalid, 1 Unknown, 0 Unchecked, 3.9s Time] [2023-03-31 22:24:55,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6814 states. [2023-03-31 22:24:55,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6814 to 6596. [2023-03-31 22:24:55,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6596 states, 6466 states have (on average 1.196102690999072) internal successors, (7734), 6506 states have internal predecessors, (7734), 33 states have call successors, (33), 33 states have call predecessors, (33), 96 states have return successors, (432), 56 states have call predecessors, (432), 32 states have call successors, (432) [2023-03-31 22:24:55,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6596 states to 6596 states and 8199 transitions. [2023-03-31 22:24:55,699 INFO L78 Accepts]: Start accepts. Automaton has 6596 states and 8199 transitions. Word has length 49 [2023-03-31 22:24:55,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:24:55,700 INFO L495 AbstractCegarLoop]: Abstraction has 6596 states and 8199 transitions. [2023-03-31 22:24:55,700 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 22:24:55,700 INFO L276 IsEmpty]: Start isEmpty. Operand 6596 states and 8199 transitions. [2023-03-31 22:24:55,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2023-03-31 22:24:55,707 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:24:55,708 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, 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 22:24:55,708 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-03-31 22:24:55,708 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:24:55,708 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:24:55,709 INFO L85 PathProgramCache]: Analyzing trace with hash 1044745846, now seen corresponding path program 1 times [2023-03-31 22:24:55,709 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:24:55,709 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [978193412] [2023-03-31 22:24:55,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:24:55,709 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:24:55,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:24:55,895 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 22:24:55,895 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:24:55,896 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [978193412] [2023-03-31 22:24:55,896 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [978193412] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 22:24:55,896 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 22:24:55,896 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-03-31 22:24:55,896 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797392762] [2023-03-31 22:24:55,896 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 22:24:55,897 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-03-31 22:24:55,897 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:24:55,897 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-03-31 22:24:55,897 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 22:24:55,897 INFO L87 Difference]: Start difference. First operand 6596 states and 8199 transitions. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 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 22:24:57,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:24:57,824 INFO L93 Difference]: Finished difference Result 16748 states and 21384 transitions. [2023-03-31 22:24:57,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-03-31 22:24:57,825 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 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 74 [2023-03-31 22:24:57,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:24:57,933 INFO L225 Difference]: With dead ends: 16748 [2023-03-31 22:24:57,934 INFO L226 Difference]: Without dead ends: 10157 [2023-03-31 22:24:57,947 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 22:24:57,949 INFO L413 NwaCegarLoop]: 730 mSDtfsCounter, 452 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 1476 mSolverCounterSat, 320 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 452 SdHoareTripleChecker+Valid, 752 SdHoareTripleChecker+Invalid, 1796 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 320 IncrementalHoareTripleChecker+Valid, 1476 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2023-03-31 22:24:57,949 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [452 Valid, 752 Invalid, 1796 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [320 Valid, 1476 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2023-03-31 22:24:57,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10157 states. [2023-03-31 22:24:58,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10157 to 9772. [2023-03-31 22:24:58,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9772 states, 9601 states have (on average 1.1710238516821165) internal successors, (11243), 9648 states have internal predecessors, (11243), 49 states have call successors, (49), 49 states have call predecessors, (49), 121 states have return successors, (761), 74 states have call predecessors, (761), 48 states have call successors, (761) [2023-03-31 22:24:58,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9772 states to 9772 states and 12053 transitions. [2023-03-31 22:24:58,162 INFO L78 Accepts]: Start accepts. Automaton has 9772 states and 12053 transitions. Word has length 74 [2023-03-31 22:24:58,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:24:58,163 INFO L495 AbstractCegarLoop]: Abstraction has 9772 states and 12053 transitions. [2023-03-31 22:24:58,163 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 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 22:24:58,163 INFO L276 IsEmpty]: Start isEmpty. Operand 9772 states and 12053 transitions. [2023-03-31 22:24:58,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2023-03-31 22:24:58,166 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:24:58,166 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:24:58,167 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-03-31 22:24:58,167 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:24:58,168 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:24:58,168 INFO L85 PathProgramCache]: Analyzing trace with hash -882558619, now seen corresponding path program 1 times [2023-03-31 22:24:58,169 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:24:58,169 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [230472844] [2023-03-31 22:24:58,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:24:58,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:24:58,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:24:58,377 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 31 proven. 14 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-03-31 22:24:58,378 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:24:58,378 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [230472844] [2023-03-31 22:24:58,378 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [230472844] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:24:58,378 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1466469670] [2023-03-31 22:24:58,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:24:58,378 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:24:58,378 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:24:58,379 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 22:24:58,407 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 22:24:58,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:24:58,503 INFO L262 TraceCheckSpWp]: Trace formula consists of 545 conjuncts, 4 conjunts are in the unsatisfiable core [2023-03-31 22:24:58,508 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 22:24:58,567 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 50 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-03-31 22:24:58,568 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 22:24:58,675 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 31 proven. 14 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-03-31 22:24:58,676 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1466469670] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 22:24:58,678 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1181882658] [2023-03-31 22:24:58,701 INFO L159 IcfgInterpreter]: Started Sifa with 70 locations of interest [2023-03-31 22:24:58,701 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 22:24:58,705 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 22:24:58,710 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 22:24:58,711 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 22:24:58,825 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 44 for LOIs [2023-03-31 22:24:58,913 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 13 [2023-03-31 22:24:59,009 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 48 [2023-03-31 22:25:00,114 INFO L197 IcfgInterpreter]: Interpreting procedure calculate_output with input of size 45 for LOIs [2023-03-31 22:25:00,146 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 13 [2023-03-31 22:25:00,602 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 48 [2023-03-31 22:25:02,466 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 52756 conjuctions. This might take some time... [2023-03-31 22:25:05,416 INFO L192 XnfTransformerHelper]: Simplified to disjunction of 561 conjuctions.