/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain EqDomain -i ../sv-benchmarks/c/eca-rers2012/Problem19_label28.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 10:35:00,049 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 10:35:00,051 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 10:35:00,082 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 10:35:00,083 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 10:35:00,083 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 10:35:00,084 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 10:35:00,085 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 10:35:00,086 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 10:35:00,087 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 10:35:00,088 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 10:35:00,089 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 10:35:00,089 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 10:35:00,089 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 10:35:00,090 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 10:35:00,091 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 10:35:00,092 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 10:35:00,092 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 10:35:00,114 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 10:35:00,115 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 10:35:00,116 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 10:35:00,117 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 10:35:00,117 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 10:35:00,118 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 10:35:00,120 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 10:35:00,120 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 10:35:00,120 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 10:35:00,126 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 10:35:00,126 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 10:35:00,127 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 10:35:00,127 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 10:35:00,127 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 10:35:00,128 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 10:35:00,128 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 10:35:00,128 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 10:35:00,129 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 10:35:00,129 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 10:35:00,129 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 10:35:00,129 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 10:35:00,130 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 10:35:00,130 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 10:35:00,134 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 10:35:00,159 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 10:35:00,159 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 10:35:00,160 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 10:35:00,160 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 10:35:00,160 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 10:35:00,161 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 10:35:00,161 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 10:35:00,161 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 10:35:00,161 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 10:35:00,161 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 10:35:00,162 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 10:35:00,162 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 10:35:00,162 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 10:35:00,162 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 10:35:00,162 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 10:35:00,162 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 10:35:00,162 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 10:35:00,163 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 10:35:00,163 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 10:35:00,163 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 10:35:00,163 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 10:35:00,163 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 10:35:00,163 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 10:35:00,164 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 10:35:00,164 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 10:35:00,164 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 10:35:00,164 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 10:35:00,164 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 10:35:00,164 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 10:35:00,164 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 10:35:00,164 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 10:35:00,164 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 10:35:00,164 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 10:35:00,164 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 10:35:00,165 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 10:35:00,165 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 10:35:00,165 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 10:35:00,165 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 10:35:00,165 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 10:35:00,165 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 10:35:00,165 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 10:35:00,165 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> EqDomain [2023-04-01 10:35:00,314 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 10:35:00,328 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 10:35:00,329 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 10:35:00,330 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 10:35:00,331 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 10:35:00,331 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/eca-rers2012/Problem19_label28.c [2023-04-01 10:35:01,346 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 10:35:01,819 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 10:35:01,820 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem19_label28.c [2023-04-01 10:35:01,855 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/940f7a264/ad1760a03e954a73a2129f67e526617c/FLAG1866e7ea1 [2023-04-01 10:35:01,866 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/940f7a264/ad1760a03e954a73a2129f67e526617c [2023-04-01 10:35:01,868 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 10:35:01,869 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 10:35:01,872 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 10:35:01,873 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 10:35:01,875 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 10:35:01,876 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 10:35:01" (1/1) ... [2023-04-01 10:35:01,877 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d97ce5c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:35:01, skipping insertion in model container [2023-04-01 10:35:01,877 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 10:35:01" (1/1) ... [2023-04-01 10:35:01,882 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 10:35:02,108 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 10:35:02,421 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/Problem19_label28.c[3379,3392] [2023-04-01 10:35:03,330 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 10:35:03,338 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 10:35:03,363 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/Problem19_label28.c[3379,3392] [2023-04-01 10:35:03,976 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 10:35:04,002 INFO L208 MainTranslator]: Completed translation [2023-04-01 10:35:04,004 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:35:04 WrapperNode [2023-04-01 10:35:04,005 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 10:35:04,006 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 10:35:04,006 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 10:35:04,006 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 10:35:04,014 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:35:04" (1/1) ... [2023-04-01 10:35:04,015 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:35:04" (1/1) ... [2023-04-01 10:35:04,082 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:35:04" (1/1) ... [2023-04-01 10:35:04,083 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:35:04" (1/1) ... [2023-04-01 10:35:04,315 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:35:04" (1/1) ... [2023-04-01 10:35:04,348 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:35:04" (1/1) ... [2023-04-01 10:35:04,380 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:35:04" (1/1) ... [2023-04-01 10:35:04,398 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:35:04" (1/1) ... [2023-04-01 10:35:04,452 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 10:35:04,453 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 10:35:04,453 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 10:35:04,453 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 10:35:04,454 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:35:04" (1/1) ... [2023-04-01 10:35:04,460 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 10:35:04,468 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 10:35:04,493 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 10:35:04,512 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 10:35:04,525 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 10:35:04,525 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 10:35:04,525 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 10:35:04,525 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2023-04-01 10:35:04,525 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2023-04-01 10:35:04,526 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output3 [2023-04-01 10:35:04,526 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output4 [2023-04-01 10:35:04,526 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output5 [2023-04-01 10:35:04,526 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output6 [2023-04-01 10:35:04,526 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 10:35:04,526 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2023-04-01 10:35:04,526 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2023-04-01 10:35:04,526 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output3 [2023-04-01 10:35:04,526 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output4 [2023-04-01 10:35:04,526 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output5 [2023-04-01 10:35:04,526 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output6 [2023-04-01 10:35:04,527 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 10:35:04,527 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 10:35:04,527 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 10:35:04,527 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 10:35:04,527 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 10:35:04,527 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2023-04-01 10:35:04,527 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 10:35:04,527 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 10:35:04,528 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 10:35:04,528 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 10:35:04,528 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 10:35:04,528 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 10:35:04,528 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 10:35:04,712 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 10:35:04,714 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 10:35:10,725 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 10:35:24,319 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 10:35:24,319 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-04-01 10:35:24,323 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 10:35:24 BoogieIcfgContainer [2023-04-01 10:35:24,323 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 10:35:24,324 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 10:35:24,324 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 10:35:24,326 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 10:35:24,326 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 10:35:01" (1/3) ... [2023-04-01 10:35:24,327 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@243f7e90 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 10:35:24, skipping insertion in model container [2023-04-01 10:35:24,327 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:35:04" (2/3) ... [2023-04-01 10:35:24,327 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@243f7e90 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 10:35:24, skipping insertion in model container [2023-04-01 10:35:24,327 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 10:35:24" (3/3) ... [2023-04-01 10:35:24,328 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem19_label28.c [2023-04-01 10:35:24,341 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 10:35:24,341 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 10:35:24,395 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 10:35:24,401 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;@5acf830b, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 10:35:24,401 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 10:35:24,409 INFO L276 IsEmpty]: Start isEmpty. Operand has 1144 states, 1126 states have (on average 1.980461811722913) internal successors, (2230), 1127 states have internal predecessors, (2230), 8 states have call successors, (8), 8 states have call predecessors, (8), 8 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-04-01 10:35:24,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-04-01 10:35:24,414 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 10:35:24,414 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 10:35:24,415 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 10:35:24,419 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 10:35:24,420 INFO L85 PathProgramCache]: Analyzing trace with hash 1432409796, now seen corresponding path program 1 times [2023-04-01 10:35:24,426 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 10:35:24,427 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [34650274] [2023-04-01 10:35:24,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 10:35:24,427 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 10:35:24,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:35:24,685 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 10:35:24,686 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 10:35:24,686 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [34650274] [2023-04-01 10:35:24,686 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [34650274] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 10:35:24,687 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 10:35:24,687 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 10:35:24,688 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [767163120] [2023-04-01 10:35:24,688 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 10:35:24,691 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 10:35:24,691 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 10:35:24,720 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 10:35:24,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 10:35:24,727 INFO L87 Difference]: Start difference. First operand has 1144 states, 1126 states have (on average 1.980461811722913) internal successors, (2230), 1127 states have internal predecessors, (2230), 8 states have call successors, (8), 8 states have call predecessors, (8), 8 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) 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 10:35:30,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 10:35:30,098 INFO L93 Difference]: Finished difference Result 3418 states and 6741 transitions. [2023-04-01 10:35:30,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 10:35:30,100 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 10:35:30,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 10:35:30,123 INFO L225 Difference]: With dead ends: 3418 [2023-04-01 10:35:30,123 INFO L226 Difference]: Without dead ends: 2271 [2023-04-01 10:35:30,131 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 10:35:30,135 INFO L413 NwaCegarLoop]: 216 mSDtfsCounter, 1291 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 3272 mSolverCounterSat, 1797 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1291 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 5069 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1797 IncrementalHoareTripleChecker+Valid, 3272 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2023-04-01 10:35:30,137 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1291 Valid, 251 Invalid, 5069 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1797 Valid, 3272 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2023-04-01 10:35:30,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2271 states. [2023-04-01 10:35:30,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2271 to 2267. [2023-04-01 10:35:30,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2267 states, 2241 states have (on average 1.892904953145917) internal successors, (4242), 2241 states have internal predecessors, (4242), 13 states have call successors, (13), 13 states have call predecessors, (13), 12 states have return successors, (22), 12 states have call predecessors, (22), 12 states have call successors, (22) [2023-04-01 10:35:30,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2267 states to 2267 states and 4277 transitions. [2023-04-01 10:35:30,241 INFO L78 Accepts]: Start accepts. Automaton has 2267 states and 4277 transitions. Word has length 11 [2023-04-01 10:35:30,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 10:35:30,242 INFO L495 AbstractCegarLoop]: Abstraction has 2267 states and 4277 transitions. [2023-04-01 10:35:30,242 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 10:35:30,243 INFO L276 IsEmpty]: Start isEmpty. Operand 2267 states and 4277 transitions. [2023-04-01 10:35:30,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-04-01 10:35:30,244 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 10:35:30,244 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 10:35:30,244 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 10:35:30,244 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 10:35:30,245 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 10:35:30,246 INFO L85 PathProgramCache]: Analyzing trace with hash -1861993453, now seen corresponding path program 1 times [2023-04-01 10:35:30,246 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 10:35:30,246 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1986626565] [2023-04-01 10:35:30,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 10:35:30,246 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 10:35:30,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:35:30,438 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 10:35:30,438 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 10:35:30,438 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1986626565] [2023-04-01 10:35:30,438 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1986626565] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 10:35:30,438 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 10:35:30,438 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-01 10:35:30,439 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094601922] [2023-04-01 10:35:30,439 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 10:35:30,440 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-01 10:35:30,440 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 10:35:30,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-01 10:35:30,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-01 10:35:30,440 INFO L87 Difference]: Start difference. First operand 2267 states and 4277 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 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 10:35:38,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 10:35:38,066 INFO L93 Difference]: Finished difference Result 6937 states and 13090 transitions. [2023-04-01 10:35:38,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-01 10:35:38,069 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 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 21 [2023-04-01 10:35:38,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 10:35:38,112 INFO L225 Difference]: With dead ends: 6937 [2023-04-01 10:35:38,112 INFO L226 Difference]: Without dead ends: 4675 [2023-04-01 10:35:38,122 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 10:35:38,124 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 4003 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 6742 mSolverCounterSat, 1791 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4003 SdHoareTripleChecker+Valid, 178 SdHoareTripleChecker+Invalid, 8533 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1791 IncrementalHoareTripleChecker+Valid, 6742 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.4s IncrementalHoareTripleChecker+Time [2023-04-01 10:35:38,124 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4003 Valid, 178 Invalid, 8533 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1791 Valid, 6742 Invalid, 0 Unknown, 0 Unchecked, 7.4s Time] [2023-04-01 10:35:38,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4675 states. [2023-04-01 10:35:38,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4675 to 4604. [2023-04-01 10:35:38,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4604 states, 4526 states have (on average 1.5733539549270878) internal successors, (7121), 4533 states have internal predecessors, (7121), 23 states have call successors, (23), 23 states have call predecessors, (23), 54 states have return successors, (142), 47 states have call predecessors, (142), 22 states have call successors, (142) [2023-04-01 10:35:38,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4604 states to 4604 states and 7286 transitions. [2023-04-01 10:35:38,268 INFO L78 Accepts]: Start accepts. Automaton has 4604 states and 7286 transitions. Word has length 21 [2023-04-01 10:35:38,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 10:35:38,268 INFO L495 AbstractCegarLoop]: Abstraction has 4604 states and 7286 transitions. [2023-04-01 10:35:38,268 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 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 10:35:38,269 INFO L276 IsEmpty]: Start isEmpty. Operand 4604 states and 7286 transitions. [2023-04-01 10:35:38,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-04-01 10:35:38,270 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 10:35:38,270 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] [2023-04-01 10:35:38,270 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-01 10:35:38,270 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 10:35:38,270 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 10:35:38,270 INFO L85 PathProgramCache]: Analyzing trace with hash -840474947, now seen corresponding path program 1 times [2023-04-01 10:35:38,271 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 10:35:38,271 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [24784456] [2023-04-01 10:35:38,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 10:35:38,271 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 10:35:38,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:35:38,380 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 10:35:38,381 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 10:35:38,381 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [24784456] [2023-04-01 10:35:38,381 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [24784456] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 10:35:38,381 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 10:35:38,381 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-01 10:35:38,381 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1221051717] [2023-04-01 10:35:38,381 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 10:35:38,381 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-01 10:35:38,381 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 10:35:38,382 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-01 10:35:38,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-01 10:35:38,382 INFO L87 Difference]: Start difference. First operand 4604 states and 7286 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 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 10:35:44,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 10:35:44,696 INFO L93 Difference]: Finished difference Result 12915 states and 21078 transitions. [2023-04-01 10:35:44,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-01 10:35:44,697 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 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 24 [2023-04-01 10:35:44,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 10:35:44,717 INFO L225 Difference]: With dead ends: 12915 [2023-04-01 10:35:44,717 INFO L226 Difference]: Without dead ends: 8316 [2023-04-01 10:35:44,723 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 10:35:44,724 INFO L413 NwaCegarLoop]: 67 mSDtfsCounter, 3658 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 6961 mSolverCounterSat, 1184 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3658 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 8145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1184 IncrementalHoareTripleChecker+Valid, 6961 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.1s IncrementalHoareTripleChecker+Time [2023-04-01 10:35:44,724 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3658 Valid, 159 Invalid, 8145 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1184 Valid, 6961 Invalid, 0 Unknown, 0 Unchecked, 6.1s Time] [2023-04-01 10:35:44,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8316 states. [2023-04-01 10:35:44,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8316 to 8220. [2023-04-01 10:35:44,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8220 states, 8029 states have (on average 1.5387968613775065) internal successors, (12355), 8053 states have internal predecessors, (12355), 38 states have call successors, (38), 38 states have call predecessors, (38), 152 states have return successors, (540), 128 states have call predecessors, (540), 37 states have call successors, (540) [2023-04-01 10:35:44,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8220 states to 8220 states and 12933 transitions. [2023-04-01 10:35:44,858 INFO L78 Accepts]: Start accepts. Automaton has 8220 states and 12933 transitions. Word has length 24 [2023-04-01 10:35:44,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 10:35:44,858 INFO L495 AbstractCegarLoop]: Abstraction has 8220 states and 12933 transitions. [2023-04-01 10:35:44,858 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 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 10:35:44,859 INFO L276 IsEmpty]: Start isEmpty. Operand 8220 states and 12933 transitions. [2023-04-01 10:35:44,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-04-01 10:35:44,860 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 10:35:44,860 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] [2023-04-01 10:35:44,860 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-04-01 10:35:44,860 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 10:35:44,861 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 10:35:44,861 INFO L85 PathProgramCache]: Analyzing trace with hash -479172139, now seen corresponding path program 1 times [2023-04-01 10:35:44,861 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 10:35:44,861 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1623678019] [2023-04-01 10:35:44,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 10:35:44,861 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 10:35:44,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:35:44,997 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 10:35:44,997 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 10:35:44,997 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1623678019] [2023-04-01 10:35:44,997 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1623678019] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 10:35:44,997 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 10:35:44,998 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-01 10:35:44,998 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1787398600] [2023-04-01 10:35:44,998 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 10:35:44,998 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-01 10:35:44,999 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 10:35:44,999 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-01 10:35:44,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-01 10:35:44,999 INFO L87 Difference]: Start difference. First operand 8220 states and 12933 transitions. Second operand has 5 states, 5 states have (on average 7.0) internal successors, (35), 4 states have internal predecessors, (35), 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 10:35:52,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 10:35:52,766 INFO L93 Difference]: Finished difference Result 24578 states and 39444 transitions. [2023-04-01 10:35:52,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-01 10:35:52,767 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.0) internal successors, (35), 4 states have internal predecessors, (35), 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 41 [2023-04-01 10:35:52,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 10:35:52,815 INFO L225 Difference]: With dead ends: 24578 [2023-04-01 10:35:52,815 INFO L226 Difference]: Without dead ends: 16363 [2023-04-01 10:35:52,830 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 10:35:52,835 INFO L413 NwaCegarLoop]: 86 mSDtfsCounter, 3696 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 7394 mSolverCounterSat, 1706 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3696 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 9100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1706 IncrementalHoareTripleChecker+Valid, 7394 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.5s IncrementalHoareTripleChecker+Time [2023-04-01 10:35:52,836 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3696 Valid, 224 Invalid, 9100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1706 Valid, 7394 Invalid, 0 Unknown, 0 Unchecked, 7.5s Time] [2023-04-01 10:35:52,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16363 states. [2023-04-01 10:35:53,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16363 to 15725. [2023-04-01 10:35:53,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15725 states, 15162 states have (on average 1.353185595567867) internal successors, (20517), 15262 states have internal predecessors, (20517), 68 states have call successors, (68), 68 states have call predecessors, (68), 494 states have return successors, (2106), 394 states have call predecessors, (2106), 67 states have call successors, (2106) [2023-04-01 10:35:53,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15725 states to 15725 states and 22691 transitions. [2023-04-01 10:35:53,278 INFO L78 Accepts]: Start accepts. Automaton has 15725 states and 22691 transitions. Word has length 41 [2023-04-01 10:35:53,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 10:35:53,279 INFO L495 AbstractCegarLoop]: Abstraction has 15725 states and 22691 transitions. [2023-04-01 10:35:53,280 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.0) internal successors, (35), 4 states have internal predecessors, (35), 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 10:35:53,280 INFO L276 IsEmpty]: Start isEmpty. Operand 15725 states and 22691 transitions. [2023-04-01 10:35:53,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-04-01 10:35:53,288 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 10:35:53,288 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 10:35:53,288 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-04-01 10:35:53,288 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 10:35:53,289 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 10:35:53,289 INFO L85 PathProgramCache]: Analyzing trace with hash -439821938, now seen corresponding path program 1 times [2023-04-01 10:35:53,289 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 10:35:53,289 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [816041714] [2023-04-01 10:35:53,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 10:35:53,289 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 10:35:53,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:35:53,440 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 10 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 10:35:53,440 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 10:35:53,440 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [816041714] [2023-04-01 10:35:53,440 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [816041714] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 10:35:53,440 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1542650032] [2023-04-01 10:35:53,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 10:35:53,441 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 10:35:53,441 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 10:35:53,459 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 10:35:53,460 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 10:35:53,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:35:53,547 INFO L262 TraceCheckSpWp]: Trace formula consists of 420 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-01 10:35:53,551 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 10:35:53,612 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 10:35:53,612 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-01 10:35:53,612 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1542650032] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 10:35:53,612 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-01 10:35:53,612 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 6 [2023-04-01 10:35:53,613 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041139066] [2023-04-01 10:35:53,613 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 10:35:53,613 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-01 10:35:53,613 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 10:35:53,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-01 10:35:53,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-04-01 10:35:53,614 INFO L87 Difference]: Start difference. First operand 15725 states and 22691 transitions. Second operand has 5 states, 5 states have (on average 6.8) internal successors, (34), 4 states have internal predecessors, (34), 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) [2023-04-01 10:35:59,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 10:35:59,798 INFO L93 Difference]: Finished difference Result 47579 states and 71177 transitions. [2023-04-01 10:35:59,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-01 10:35:59,798 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.8) internal successors, (34), 4 states have internal predecessors, (34), 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 46 [2023-04-01 10:35:59,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 10:35:59,915 INFO L225 Difference]: With dead ends: 47579 [2023-04-01 10:35:59,915 INFO L226 Difference]: Without dead ends: 31859 [2023-04-01 10:35:59,943 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2023-04-01 10:35:59,945 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 5990 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 6259 mSolverCounterSat, 905 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5990 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 7164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 905 IncrementalHoareTripleChecker+Valid, 6259 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.7s IncrementalHoareTripleChecker+Time [2023-04-01 10:35:59,945 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5990 Valid, 125 Invalid, 7164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [905 Valid, 6259 Invalid, 0 Unknown, 0 Unchecked, 5.7s Time] [2023-04-01 10:35:59,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31859 states. [2023-04-01 10:36:00,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31859 to 26895. [2023-04-01 10:36:00,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26895 states, 25857 states have (on average 1.351819623312836) internal successors, (34954), 26053 states have internal predecessors, (34954), 115 states have call successors, (115), 115 states have call predecessors, (115), 922 states have return successors, (4107), 726 states have call predecessors, (4107), 114 states have call successors, (4107) [2023-04-01 10:36:00,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26895 states to 26895 states and 39176 transitions. [2023-04-01 10:36:00,514 INFO L78 Accepts]: Start accepts. Automaton has 26895 states and 39176 transitions. Word has length 46 [2023-04-01 10:36:00,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 10:36:00,515 INFO L495 AbstractCegarLoop]: Abstraction has 26895 states and 39176 transitions. [2023-04-01 10:36:00,515 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.8) internal successors, (34), 4 states have internal predecessors, (34), 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) [2023-04-01 10:36:00,515 INFO L276 IsEmpty]: Start isEmpty. Operand 26895 states and 39176 transitions. [2023-04-01 10:36:00,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2023-04-01 10:36:00,517 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 10:36:00,517 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 10:36:00,531 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 10:36:00,721 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 10:36:00,721 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 10:36:00,722 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 10:36:00,722 INFO L85 PathProgramCache]: Analyzing trace with hash 671865962, now seen corresponding path program 1 times [2023-04-01 10:36:00,722 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 10:36:00,722 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1997533813] [2023-04-01 10:36:00,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 10:36:00,723 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 10:36:00,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:36:00,886 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 10:36:00,886 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 10:36:00,886 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1997533813] [2023-04-01 10:36:00,886 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1997533813] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 10:36:00,886 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [365685316] [2023-04-01 10:36:00,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 10:36:00,887 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 10:36:00,887 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 10:36:00,902 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 10:36:00,956 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-01 10:36:01,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:36:01,014 INFO L262 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-01 10:36:01,017 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 10:36:01,093 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 10:36:01,093 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-01 10:36:01,093 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [365685316] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 10:36:01,094 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-01 10:36:01,094 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 8 [2023-04-01 10:36:01,094 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972159981] [2023-04-01 10:36:01,094 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 10:36:01,094 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-01 10:36:01,094 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 10:36:01,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-01 10:36:01,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-04-01 10:36:01,095 INFO L87 Difference]: Start difference. First operand 26895 states and 39176 transitions. Second operand has 5 states, 5 states have (on average 9.6) internal successors, (48), 4 states have internal predecessors, (48), 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)