/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 OctagonDomain -i ../sv-benchmarks/c/eca-rers2012/Problem16_label16.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 04:17:36,984 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 04:17:36,986 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 04:17:37,025 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 04:17:37,025 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 04:17:37,029 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 04:17:37,034 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 04:17:37,037 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 04:17:37,039 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 04:17:37,045 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 04:17:37,046 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 04:17:37,047 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 04:17:37,048 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 04:17:37,048 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 04:17:37,049 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 04:17:37,050 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 04:17:37,050 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 04:17:37,051 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 04:17:37,052 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 04:17:37,054 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 04:17:37,055 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 04:17:37,059 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 04:17:37,060 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 04:17:37,061 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 04:17:37,073 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 04:17:37,074 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 04:17:37,074 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 04:17:37,076 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 04:17:37,077 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 04:17:37,078 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 04:17:37,078 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 04:17:37,079 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 04:17:37,081 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 04:17:37,081 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 04:17:37,085 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 04:17:37,085 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 04:17:37,086 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 04:17:37,087 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 04:17:37,087 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 04:17:37,087 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 04:17:37,088 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 04:17:37,090 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-01 04:17:37,121 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 04:17:37,121 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 04:17:37,121 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 04:17:37,122 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 04:17:37,122 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 04:17:37,122 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 04:17:37,123 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 04:17:37,123 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 04:17:37,123 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 04:17:37,123 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 04:17:37,123 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 04:17:37,123 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 04:17:37,123 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 04:17:37,123 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 04:17:37,124 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 04:17:37,124 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 04:17:37,124 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 04:17:37,127 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 04:17:37,128 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 04:17:37,128 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 04:17:37,129 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 04:17:37,129 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 04:17:37,129 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 04:17:37,129 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 04:17:37,129 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 04:17:37,130 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 04:17:37,130 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 04:17:37,130 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 04:17:37,130 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 04:17:37,130 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 04:17:37,131 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 04:17:37,131 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 04:17:37,131 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 04:17:37,131 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 04:17:37,131 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 04:17:37,131 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 04:17:37,132 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 04:17:37,132 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 04:17:37,133 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 04:17:37,133 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 04:17:37,133 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 04:17:37,133 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-01 04:17:37,374 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 04:17:37,402 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 04:17:37,405 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 04:17:37,407 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 04:17:37,407 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 04:17:37,409 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/eca-rers2012/Problem16_label16.c [2023-04-01 04:17:38,610 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 04:17:38,980 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 04:17:38,985 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem16_label16.c [2023-04-01 04:17:39,005 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/16aa1f33e/8382daaf19f342c1ac625c62a1b3d47d/FLAG949d781bd [2023-04-01 04:17:39,022 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/16aa1f33e/8382daaf19f342c1ac625c62a1b3d47d [2023-04-01 04:17:39,026 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 04:17:39,027 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 04:17:39,029 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 04:17:39,029 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 04:17:39,032 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 04:17:39,032 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 04:17:39" (1/1) ... [2023-04-01 04:17:39,033 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@64647d67 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:17:39, skipping insertion in model container [2023-04-01 04:17:39,034 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 04:17:39" (1/1) ... [2023-04-01 04:17:39,040 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 04:17:39,107 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 04:17:39,325 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/Problem16_label16.c[4534,4547] [2023-04-01 04:17:39,713 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 04:17:39,725 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 04:17:39,755 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/Problem16_label16.c[4534,4547] [2023-04-01 04:17:39,903 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 04:17:39,919 INFO L208 MainTranslator]: Completed translation [2023-04-01 04:17:39,920 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:17:39 WrapperNode [2023-04-01 04:17:39,920 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 04:17:39,921 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 04:17:39,921 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 04:17:39,922 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 04:17:39,933 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:17:39" (1/1) ... [2023-04-01 04:17:39,934 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:17:39" (1/1) ... [2023-04-01 04:17:39,984 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:17:39" (1/1) ... [2023-04-01 04:17:39,985 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:17:39" (1/1) ... [2023-04-01 04:17:40,047 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:17:39" (1/1) ... [2023-04-01 04:17:40,065 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:17:39" (1/1) ... [2023-04-01 04:17:40,088 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:17:39" (1/1) ... [2023-04-01 04:17:40,097 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:17:39" (1/1) ... [2023-04-01 04:17:40,112 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 04:17:40,113 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 04:17:40,113 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 04:17:40,113 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 04:17:40,115 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:17:39" (1/1) ... [2023-04-01 04:17:40,123 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 04:17:40,132 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 04:17:40,150 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-01 04:17:40,171 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-01 04:17:40,187 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 04:17:40,188 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 04:17:40,188 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 04:17:40,188 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2023-04-01 04:17:40,188 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2023-04-01 04:17:40,188 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 04:17:40,188 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2023-04-01 04:17:40,188 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2023-04-01 04:17:40,189 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 04:17:40,189 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 04:17:40,189 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 04:17:40,189 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 04:17:40,189 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 04:17:40,189 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2023-04-01 04:17:40,189 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 04:17:40,189 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 04:17:40,189 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 04:17:40,189 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 04:17:40,190 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 04:17:40,190 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 04:17:40,190 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 04:17:40,274 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 04:17:40,276 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 04:17:42,208 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 04:17:43,331 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 04:17:43,331 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-04-01 04:17:43,335 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 04:17:43 BoogieIcfgContainer [2023-04-01 04:17:43,335 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 04:17:43,338 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 04:17:43,338 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 04:17:43,341 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 04:17:43,342 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 04:17:39" (1/3) ... [2023-04-01 04:17:43,342 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@682f9798 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 04:17:43, skipping insertion in model container [2023-04-01 04:17:43,342 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:17:39" (2/3) ... [2023-04-01 04:17:43,343 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@682f9798 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 04:17:43, skipping insertion in model container [2023-04-01 04:17:43,343 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 04:17:43" (3/3) ... [2023-04-01 04:17:43,344 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem16_label16.c [2023-04-01 04:17:43,363 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 04:17:43,364 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 04:17:43,427 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 04:17:43,436 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;@30421b5f, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 04:17:43,437 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 04:17:43,444 INFO L276 IsEmpty]: Start isEmpty. Operand has 244 states, 234 states have (on average 1.9572649572649572) internal successors, (458), 235 states have internal predecessors, (458), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 04:17:43,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-04-01 04:17:43,452 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:17:43,452 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 04:17:43,453 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:17:43,459 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:17:43,460 INFO L85 PathProgramCache]: Analyzing trace with hash -510220729, now seen corresponding path program 1 times [2023-04-01 04:17:43,470 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:17:43,470 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1645837743] [2023-04-01 04:17:43,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:17:43,471 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:17:43,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:17:43,799 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 04:17:43,800 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:17:43,800 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1645837743] [2023-04-01 04:17:43,801 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1645837743] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 04:17:43,801 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 04:17:43,801 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 04:17:43,802 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889932119] [2023-04-01 04:17:43,803 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 04:17:43,807 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 04:17:43,807 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 04:17:43,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 04:17:43,834 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 04:17:43,839 INFO L87 Difference]: Start difference. First operand has 244 states, 234 states have (on average 1.9572649572649572) internal successors, (458), 235 states have internal predecessors, (458), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 2.3333333333333335) 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) [2023-04-01 04:17:45,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 04:17:45,089 INFO L93 Difference]: Finished difference Result 718 states and 1389 transitions. [2023-04-01 04:17:45,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 04:17:45,094 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 [2023-04-01 04:17:45,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 04:17:45,115 INFO L225 Difference]: With dead ends: 718 [2023-04-01 04:17:45,116 INFO L226 Difference]: Without dead ends: 471 [2023-04-01 04:17:45,124 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 [2023-04-01 04:17:45,130 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 268 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 774 mSolverCounterSat, 142 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 268 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 916 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 142 IncrementalHoareTripleChecker+Valid, 774 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2023-04-01 04:17:45,131 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [268 Valid, 83 Invalid, 916 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [142 Valid, 774 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2023-04-01 04:17:45,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 471 states. [2023-04-01 04:17:45,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 471 to 469. [2023-04-01 04:17:45,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 459 states have (on average 1.8540305010893245) internal successors, (851), 459 states have internal predecessors, (851), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2023-04-01 04:17:45,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 862 transitions. [2023-04-01 04:17:45,236 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 862 transitions. Word has length 11 [2023-04-01 04:17:45,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 04:17:45,236 INFO L495 AbstractCegarLoop]: Abstraction has 469 states and 862 transitions. [2023-04-01 04:17:45,237 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) [2023-04-01 04:17:45,237 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 862 transitions. [2023-04-01 04:17:45,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-04-01 04:17:45,239 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:17:45,239 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] [2023-04-01 04:17:45,239 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 04:17:45,239 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:17:45,240 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:17:45,240 INFO L85 PathProgramCache]: Analyzing trace with hash -257318116, now seen corresponding path program 1 times [2023-04-01 04:17:45,240 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:17:45,241 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [82516510] [2023-04-01 04:17:45,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:17:45,241 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:17:45,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:17:45,523 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 04:17:45,523 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:17:45,523 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [82516510] [2023-04-01 04:17:45,524 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [82516510] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 04:17:45,524 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 04:17:45,524 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-01 04:17:45,524 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757409758] [2023-04-01 04:17:45,524 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 04:17:45,525 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-01 04:17:45,525 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 04:17:45,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-01 04:17:45,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-01 04:17:45,526 INFO L87 Difference]: Start difference. First operand 469 states and 862 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 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) [2023-04-01 04:17:47,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 04:17:47,710 INFO L93 Difference]: Finished difference Result 1421 states and 2642 transitions. [2023-04-01 04:17:47,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-01 04:17:47,710 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 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 27 [2023-04-01 04:17:47,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 04:17:47,716 INFO L225 Difference]: With dead ends: 1421 [2023-04-01 04:17:47,716 INFO L226 Difference]: Without dead ends: 957 [2023-04-01 04:17:47,717 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 [2023-04-01 04:17:47,718 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 721 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 1352 mSolverCounterSat, 379 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 721 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 1731 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 379 IncrementalHoareTripleChecker+Valid, 1352 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2023-04-01 04:17:47,719 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [721 Valid, 56 Invalid, 1731 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [379 Valid, 1352 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2023-04-01 04:17:47,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 957 states. [2023-04-01 04:17:47,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 957 to 933. [2023-04-01 04:17:47,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 933 states, 915 states have (on average 1.7497267759562842) internal successors, (1601), 919 states have internal predecessors, (1601), 7 states have call successors, (7), 7 states have call predecessors, (7), 10 states have return successors, (26), 6 states have call predecessors, (26), 6 states have call successors, (26) [2023-04-01 04:17:47,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 933 states to 933 states and 1634 transitions. [2023-04-01 04:17:47,776 INFO L78 Accepts]: Start accepts. Automaton has 933 states and 1634 transitions. Word has length 27 [2023-04-01 04:17:47,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 04:17:47,776 INFO L495 AbstractCegarLoop]: Abstraction has 933 states and 1634 transitions. [2023-04-01 04:17:47,776 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 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) [2023-04-01 04:17:47,776 INFO L276 IsEmpty]: Start isEmpty. Operand 933 states and 1634 transitions. [2023-04-01 04:17:47,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-04-01 04:17:47,777 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:17:47,778 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] [2023-04-01 04:17:47,778 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-01 04:17:47,778 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:17:47,778 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:17:47,779 INFO L85 PathProgramCache]: Analyzing trace with hash 1196213716, now seen corresponding path program 1 times [2023-04-01 04:17:47,779 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:17:47,779 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1958980503] [2023-04-01 04:17:47,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:17:47,779 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:17:47,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:17:47,884 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 04:17:47,884 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:17:47,884 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1958980503] [2023-04-01 04:17:47,885 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1958980503] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 04:17:47,885 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 04:17:47,885 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-01 04:17:47,885 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999491470] [2023-04-01 04:17:47,885 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 04:17:47,886 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-01 04:17:47,886 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 04:17:47,886 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-01 04:17:47,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-01 04:17:47,887 INFO L87 Difference]: Start difference. First operand 933 states and 1634 transitions. Second operand has 5 states, 5 states have (on average 5.0) internal successors, (25), 4 states have internal predecessors, (25), 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) [2023-04-01 04:17:49,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 04:17:49,412 INFO L93 Difference]: Finished difference Result 2591 states and 4654 transitions. [2023-04-01 04:17:49,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-01 04:17:49,414 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 4 states have internal predecessors, (25), 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 31 [2023-04-01 04:17:49,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 04:17:49,426 INFO L225 Difference]: With dead ends: 2591 [2023-04-01 04:17:49,426 INFO L226 Difference]: Without dead ends: 1663 [2023-04-01 04:17:49,433 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 [2023-04-01 04:17:49,436 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 871 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 1246 mSolverCounterSat, 398 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 871 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 1644 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 398 IncrementalHoareTripleChecker+Valid, 1246 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2023-04-01 04:17:49,438 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [871 Valid, 44 Invalid, 1644 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [398 Valid, 1246 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2023-04-01 04:17:49,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1663 states. [2023-04-01 04:17:49,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1663 to 1631. [2023-04-01 04:17:49,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1631 states, 1594 states have (on average 1.6317440401505645) internal successors, (2601), 1611 states have internal predecessors, (2601), 10 states have call successors, (10), 10 states have call predecessors, (10), 26 states have return successors, (101), 9 states have call predecessors, (101), 9 states have call successors, (101) [2023-04-01 04:17:49,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1631 states to 1631 states and 2712 transitions. [2023-04-01 04:17:49,510 INFO L78 Accepts]: Start accepts. Automaton has 1631 states and 2712 transitions. Word has length 31 [2023-04-01 04:17:49,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 04:17:49,510 INFO L495 AbstractCegarLoop]: Abstraction has 1631 states and 2712 transitions. [2023-04-01 04:17:49,510 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 4 states have internal predecessors, (25), 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) [2023-04-01 04:17:49,510 INFO L276 IsEmpty]: Start isEmpty. Operand 1631 states and 2712 transitions. [2023-04-01 04:17:49,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-04-01 04:17:49,512 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:17:49,512 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] [2023-04-01 04:17:49,512 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-04-01 04:17:49,512 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:17:49,513 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:17:49,513 INFO L85 PathProgramCache]: Analyzing trace with hash -197252304, now seen corresponding path program 1 times [2023-04-01 04:17:49,513 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:17:49,513 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1799881347] [2023-04-01 04:17:49,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:17:49,514 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:17:49,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:17:49,659 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 04:17:49,659 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:17:49,660 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1799881347] [2023-04-01 04:17:49,660 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1799881347] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 04:17:49,661 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 04:17:49,661 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-01 04:17:49,661 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663650133] [2023-04-01 04:17:49,661 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 04:17:49,662 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-01 04:17:49,662 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 04:17:49,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-01 04:17:49,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-01 04:17:49,663 INFO L87 Difference]: Start difference. First operand 1631 states and 2712 transitions. Second operand has 5 states, 5 states have (on average 5.4) internal successors, (27), 4 states have internal predecessors, (27), 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) [2023-04-01 04:17:51,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 04:17:51,101 INFO L93 Difference]: Finished difference Result 3755 states and 6262 transitions. [2023-04-01 04:17:51,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-01 04:17:51,102 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 4 states have internal predecessors, (27), 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 33 [2023-04-01 04:17:51,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 04:17:51,113 INFO L225 Difference]: With dead ends: 3755 [2023-04-01 04:17:51,113 INFO L226 Difference]: Without dead ends: 2129 [2023-04-01 04:17:51,120 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 [2023-04-01 04:17:51,130 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 890 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 1264 mSolverCounterSat, 379 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 890 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 1643 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 379 IncrementalHoareTripleChecker+Valid, 1264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2023-04-01 04:17:51,130 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [890 Valid, 43 Invalid, 1643 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [379 Valid, 1264 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2023-04-01 04:17:51,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2129 states. [2023-04-01 04:17:51,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2129 to 2079. [2023-04-01 04:17:51,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2079 states, 2025 states have (on average 1.5491358024691357) internal successors, (3137), 2055 states have internal predecessors, (3137), 12 states have call successors, (12), 12 states have call predecessors, (12), 41 states have return successors, (172), 11 states have call predecessors, (172), 11 states have call successors, (172) [2023-04-01 04:17:51,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2079 states to 2079 states and 3321 transitions. [2023-04-01 04:17:51,208 INFO L78 Accepts]: Start accepts. Automaton has 2079 states and 3321 transitions. Word has length 33 [2023-04-01 04:17:51,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 04:17:51,208 INFO L495 AbstractCegarLoop]: Abstraction has 2079 states and 3321 transitions. [2023-04-01 04:17:51,209 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 4 states have internal predecessors, (27), 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) [2023-04-01 04:17:51,209 INFO L276 IsEmpty]: Start isEmpty. Operand 2079 states and 3321 transitions. [2023-04-01 04:17:51,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-04-01 04:17:51,215 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:17:51,215 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] [2023-04-01 04:17:51,215 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-04-01 04:17:51,216 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:17:51,216 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:17:51,216 INFO L85 PathProgramCache]: Analyzing trace with hash -265123565, now seen corresponding path program 1 times [2023-04-01 04:17:51,216 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:17:51,217 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1111910997] [2023-04-01 04:17:51,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:17:51,217 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:17:51,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:17:51,366 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 04:17:51,367 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:17:51,367 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1111910997] [2023-04-01 04:17:51,367 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1111910997] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 04:17:51,367 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 04:17:51,367 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-01 04:17:51,367 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155449351] [2023-04-01 04:17:51,368 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 04:17:51,368 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-01 04:17:51,368 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 04:17:51,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-01 04:17:51,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-01 04:17:51,369 INFO L87 Difference]: Start difference. First operand 2079 states and 3321 transitions. Second operand has 5 states, 5 states have (on average 6.0) internal successors, (30), 4 states have internal predecessors, (30), 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) [2023-04-01 04:17:52,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 04:17:52,930 INFO L93 Difference]: Finished difference Result 6006 states and 9910 transitions. [2023-04-01 04:17:52,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-01 04:17:52,931 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.0) internal successors, (30), 4 states have internal predecessors, (30), 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 36 [2023-04-01 04:17:52,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 04:17:52,955 INFO L225 Difference]: With dead ends: 6006 [2023-04-01 04:17:52,955 INFO L226 Difference]: Without dead ends: 3932 [2023-04-01 04:17:52,962 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 [2023-04-01 04:17:52,963 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 752 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 1451 mSolverCounterSat, 368 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 752 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 1819 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 368 IncrementalHoareTripleChecker+Valid, 1451 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2023-04-01 04:17:52,963 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [752 Valid, 48 Invalid, 1819 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [368 Valid, 1451 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2023-04-01 04:17:52,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3932 states. [2023-04-01 04:17:53,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3932 to 3676. [2023-04-01 04:17:53,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3676 states, 3594 states have (on average 1.4924874791318865) internal successors, (5364), 3636 states have internal predecessors, (5364), 20 states have call successors, (20), 20 states have call predecessors, (20), 61 states have return successors, (444), 19 states have call predecessors, (444), 19 states have call successors, (444) [2023-04-01 04:17:53,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3676 states to 3676 states and 5828 transitions. [2023-04-01 04:17:53,114 INFO L78 Accepts]: Start accepts. Automaton has 3676 states and 5828 transitions. Word has length 36 [2023-04-01 04:17:53,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 04:17:53,114 INFO L495 AbstractCegarLoop]: Abstraction has 3676 states and 5828 transitions. [2023-04-01 04:17:53,114 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.0) internal successors, (30), 4 states have internal predecessors, (30), 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) [2023-04-01 04:17:53,114 INFO L276 IsEmpty]: Start isEmpty. Operand 3676 states and 5828 transitions. [2023-04-01 04:17:53,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-04-01 04:17:53,115 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:17:53,115 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] [2023-04-01 04:17:53,115 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-04-01 04:17:53,116 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:17:53,116 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:17:53,116 INFO L85 PathProgramCache]: Analyzing trace with hash -1302665169, now seen corresponding path program 1 times [2023-04-01 04:17:53,116 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:17:53,116 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1618169118] [2023-04-01 04:17:53,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:17:53,117 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:17:53,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:17:53,268 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 04:17:53,269 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:17:53,269 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1618169118] [2023-04-01 04:17:53,269 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1618169118] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 04:17:53,269 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 04:17:53,269 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-01 04:17:53,269 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565954254] [2023-04-01 04:17:53,270 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 04:17:53,270 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-01 04:17:53,270 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 04:17:53,270 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-01 04:17:53,271 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-01 04:17:53,271 INFO L87 Difference]: Start difference. First operand 3676 states and 5828 transitions. Second operand has 5 states, 5 states have (on average 6.4) internal successors, (32), 4 states have internal predecessors, (32), 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) [2023-04-01 04:17:54,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 04:17:54,740 INFO L93 Difference]: Finished difference Result 9375 states and 15407 transitions. [2023-04-01 04:17:54,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-01 04:17:54,741 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.4) internal successors, (32), 4 states have internal predecessors, (32), 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 38 [2023-04-01 04:17:54,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 04:17:54,776 INFO L225 Difference]: With dead ends: 9375 [2023-04-01 04:17:54,776 INFO L226 Difference]: Without dead ends: 5704 [2023-04-01 04:17:54,788 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 [2023-04-01 04:17:54,789 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 964 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 1145 mSolverCounterSat, 439 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 964 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 1584 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 439 IncrementalHoareTripleChecker+Valid, 1145 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2023-04-01 04:17:54,789 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [964 Valid, 45 Invalid, 1584 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [439 Valid, 1145 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2023-04-01 04:17:54,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5704 states. [2023-04-01 04:17:54,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5704 to 3985. [2023-04-01 04:17:55,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3985 states, 3878 states have (on average 1.3669417225373903) internal successors, (5301), 3933 states have internal predecessors, (5301), 26 states have call successors, (26), 26 states have call predecessors, (26), 80 states have return successors, (553), 25 states have call predecessors, (553), 25 states have call successors, (553) [2023-04-01 04:17:55,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3985 states to 3985 states and 5880 transitions. [2023-04-01 04:17:55,017 INFO L78 Accepts]: Start accepts. Automaton has 3985 states and 5880 transitions. Word has length 38 [2023-04-01 04:17:55,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 04:17:55,017 INFO L495 AbstractCegarLoop]: Abstraction has 3985 states and 5880 transitions. [2023-04-01 04:17:55,017 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.4) internal successors, (32), 4 states have internal predecessors, (32), 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) [2023-04-01 04:17:55,018 INFO L276 IsEmpty]: Start isEmpty. Operand 3985 states and 5880 transitions. [2023-04-01 04:17:55,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-04-01 04:17:55,020 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:17:55,020 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] [2023-04-01 04:17:55,021 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-04-01 04:17:55,021 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:17:55,021 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:17:55,021 INFO L85 PathProgramCache]: Analyzing trace with hash -2130481668, now seen corresponding path program 1 times [2023-04-01 04:17:55,022 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:17:55,022 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [659214272] [2023-04-01 04:17:55,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:17:55,022 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:17:55,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:17:55,168 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 04:17:55,168 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:17:55,168 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [659214272] [2023-04-01 04:17:55,168 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [659214272] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 04:17:55,169 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1987540355] [2023-04-01 04:17:55,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:17:55,170 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 04:17:55,170 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 04:17:55,173 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 04:17:55,177 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-01 04:17:55,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:17:55,259 INFO L262 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-01 04:17:55,264 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 04:17:55,304 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 04:17:55,305 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-01 04:17:55,305 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1987540355] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 04:17:55,305 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-01 04:17:55,305 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2023-04-01 04:17:55,305 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794363813] [2023-04-01 04:17:55,305 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 04:17:55,305 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 04:17:55,306 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 04:17:55,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 04:17:55,306 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-04-01 04:17:55,306 INFO L87 Difference]: Start difference. First operand 3985 states and 5880 transitions. Second operand has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 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) [2023-04-01 04:17:56,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 04:17:56,354 INFO L93 Difference]: Finished difference Result 10007 states and 14828 transitions. [2023-04-01 04:17:56,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 04:17:56,354 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 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 43 [2023-04-01 04:17:56,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 04:17:56,382 INFO L225 Difference]: With dead ends: 10007 [2023-04-01 04:17:56,382 INFO L226 Difference]: Without dead ends: 6027 [2023-04-01 04:17:56,395 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-04-01 04:17:56,396 INFO L413 NwaCegarLoop]: 208 mSDtfsCounter, 235 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 596 mSolverCounterSat, 285 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 235 SdHoareTripleChecker+Valid, 219 SdHoareTripleChecker+Invalid, 881 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 285 IncrementalHoareTripleChecker+Valid, 596 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-04-01 04:17:56,396 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [235 Valid, 219 Invalid, 881 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [285 Valid, 596 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-04-01 04:17:56,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6027 states. [2023-04-01 04:17:56,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6027 to 5908. [2023-04-01 04:17:56,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5908 states, 5782 states have (on average 1.284503631961259) internal successors, (7427), 5838 states have internal predecessors, (7427), 35 states have call successors, (35), 35 states have call predecessors, (35), 90 states have return successors, (720), 34 states have call predecessors, (720), 34 states have call successors, (720) [2023-04-01 04:17:56,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5908 states to 5908 states and 8182 transitions. [2023-04-01 04:17:56,585 INFO L78 Accepts]: Start accepts. Automaton has 5908 states and 8182 transitions. Word has length 43 [2023-04-01 04:17:56,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 04:17:56,586 INFO L495 AbstractCegarLoop]: Abstraction has 5908 states and 8182 transitions. [2023-04-01 04:17:56,586 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 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) [2023-04-01 04:17:56,586 INFO L276 IsEmpty]: Start isEmpty. Operand 5908 states and 8182 transitions. [2023-04-01 04:17:56,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2023-04-01 04:17:56,589 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:17:56,589 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, 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, 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, 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] [2023-04-01 04:17:56,600 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-01 04:17:56,795 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 04:17:56,796 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:17:56,796 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:17:56,797 INFO L85 PathProgramCache]: Analyzing trace with hash 1751152814, now seen corresponding path program 1 times [2023-04-01 04:17:56,797 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:17:56,797 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1540409342] [2023-04-01 04:17:56,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:17:56,797 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:17:56,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat