/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain IntervalDomain -i ../sv-benchmarks/c/eca-rers2012/Problem01_label56.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-03-31 21:12:13,909 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-03-31 21:12:13,911 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-03-31 21:12:13,937 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-03-31 21:12:13,938 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-03-31 21:12:13,939 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-03-31 21:12:13,940 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-03-31 21:12:13,941 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-03-31 21:12:13,943 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-03-31 21:12:13,943 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-03-31 21:12:13,944 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-03-31 21:12:13,945 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-03-31 21:12:13,946 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-03-31 21:12:13,947 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-03-31 21:12:13,947 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-03-31 21:12:13,948 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-03-31 21:12:13,949 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-03-31 21:12:13,950 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-03-31 21:12:13,951 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-03-31 21:12:13,952 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-03-31 21:12:13,953 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-03-31 21:12:13,958 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-03-31 21:12:13,959 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-03-31 21:12:13,959 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-03-31 21:12:13,962 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-03-31 21:12:13,963 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-03-31 21:12:13,963 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-03-31 21:12:13,964 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-03-31 21:12:13,964 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-03-31 21:12:13,965 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-03-31 21:12:13,966 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-03-31 21:12:13,966 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-03-31 21:12:13,967 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-03-31 21:12:13,968 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-03-31 21:12:13,969 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-03-31 21:12:13,973 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-03-31 21:12:13,974 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-03-31 21:12:13,974 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-03-31 21:12:13,974 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-03-31 21:12:13,975 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-03-31 21:12:13,975 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-03-31 21:12:13,976 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-03-31 21:12:14,000 INFO L113 SettingsManager]: Loading preferences was successful [2023-03-31 21:12:14,000 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-03-31 21:12:14,001 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-03-31 21:12:14,001 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-03-31 21:12:14,002 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-03-31 21:12:14,002 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-03-31 21:12:14,002 INFO L138 SettingsManager]: * User list type=DISABLED [2023-03-31 21:12:14,002 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-03-31 21:12:14,002 INFO L138 SettingsManager]: * Explicit value domain=true [2023-03-31 21:12:14,002 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-03-31 21:12:14,002 INFO L138 SettingsManager]: * Octagon Domain=false [2023-03-31 21:12:14,002 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-03-31 21:12:14,003 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-03-31 21:12:14,003 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-03-31 21:12:14,003 INFO L138 SettingsManager]: * Interval Domain=false [2023-03-31 21:12:14,003 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-03-31 21:12:14,003 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-03-31 21:12:14,003 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-03-31 21:12:14,004 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-03-31 21:12:14,004 INFO L138 SettingsManager]: * sizeof long=4 [2023-03-31 21:12:14,004 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-03-31 21:12:14,004 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-03-31 21:12:14,004 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-03-31 21:12:14,005 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-03-31 21:12:14,005 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-03-31 21:12:14,005 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-03-31 21:12:14,005 INFO L138 SettingsManager]: * sizeof long double=12 [2023-03-31 21:12:14,005 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-03-31 21:12:14,005 INFO L138 SettingsManager]: * Use constant arrays=true [2023-03-31 21:12:14,005 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-03-31 21:12:14,005 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-03-31 21:12:14,005 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-03-31 21:12:14,006 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 21:12:14,006 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-03-31 21:12:14,006 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-03-31 21:12:14,006 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-03-31 21:12:14,006 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-03-31 21:12:14,006 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-03-31 21:12:14,006 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-03-31 21:12:14,006 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-03-31 21:12:14,007 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-03-31 21:12:14,007 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> IntervalDomain [2023-03-31 21:12:14,219 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-03-31 21:12:14,249 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-03-31 21:12:14,251 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-03-31 21:12:14,252 INFO L271 PluginConnector]: Initializing CDTParser... [2023-03-31 21:12:14,253 INFO L275 PluginConnector]: CDTParser initialized [2023-03-31 21:12:14,254 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/eca-rers2012/Problem01_label56.c [2023-03-31 21:12:15,428 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-03-31 21:12:15,750 INFO L351 CDTParser]: Found 1 translation units. [2023-03-31 21:12:15,751 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem01_label56.c [2023-03-31 21:12:15,760 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b6f3bd966/d499bedeec4143c89a5ddd33d9afd285/FLAG73b7b6362 [2023-03-31 21:12:16,045 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b6f3bd966/d499bedeec4143c89a5ddd33d9afd285 [2023-03-31 21:12:16,048 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-03-31 21:12:16,049 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-03-31 21:12:16,050 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-03-31 21:12:16,050 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-03-31 21:12:16,053 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-03-31 21:12:16,053 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 09:12:16" (1/1) ... [2023-03-31 21:12:16,054 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@50918fc7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:12:16, skipping insertion in model container [2023-03-31 21:12:16,054 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 09:12:16" (1/1) ... [2023-03-31 21:12:16,066 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-03-31 21:12:16,108 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-03-31 21:12:16,394 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/Problem01_label56.c[15002,15015] [2023-03-31 21:12:16,439 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 21:12:16,460 INFO L203 MainTranslator]: Completed pre-run [2023-03-31 21:12:16,511 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/Problem01_label56.c[15002,15015] [2023-03-31 21:12:16,529 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 21:12:16,545 INFO L208 MainTranslator]: Completed translation [2023-03-31 21:12:16,545 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:12:16 WrapperNode [2023-03-31 21:12:16,546 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-03-31 21:12:16,547 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-03-31 21:12:16,547 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-03-31 21:12:16,547 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-03-31 21:12:16,558 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:12:16" (1/1) ... [2023-03-31 21:12:16,559 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:12:16" (1/1) ... [2023-03-31 21:12:16,582 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:12:16" (1/1) ... [2023-03-31 21:12:16,584 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:12:16" (1/1) ... [2023-03-31 21:12:16,611 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:12:16" (1/1) ... [2023-03-31 21:12:16,618 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:12:16" (1/1) ... [2023-03-31 21:12:16,624 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:12:16" (1/1) ... [2023-03-31 21:12:16,629 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:12:16" (1/1) ... [2023-03-31 21:12:16,636 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-03-31 21:12:16,637 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-03-31 21:12:16,637 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-03-31 21:12:16,637 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-03-31 21:12:16,640 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:12:16" (1/1) ... [2023-03-31 21:12:16,647 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 21:12:16,659 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 21:12:16,670 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-03-31 21:12:16,694 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-03-31 21:12:16,713 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-03-31 21:12:16,713 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-03-31 21:12:16,713 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-03-31 21:12:16,713 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2023-03-31 21:12:16,713 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-03-31 21:12:16,713 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2023-03-31 21:12:16,713 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-03-31 21:12:16,714 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-03-31 21:12:16,714 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-03-31 21:12:16,714 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-03-31 21:12:16,714 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-03-31 21:12:16,714 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2023-03-31 21:12:16,714 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-03-31 21:12:16,714 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-03-31 21:12:16,714 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-03-31 21:12:16,715 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-03-31 21:12:16,715 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-03-31 21:12:16,715 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-03-31 21:12:16,715 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-03-31 21:12:16,805 INFO L236 CfgBuilder]: Building ICFG [2023-03-31 21:12:16,807 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-03-31 21:12:17,741 INFO L277 CfgBuilder]: Performing block encoding [2023-03-31 21:12:17,990 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-03-31 21:12:17,990 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-03-31 21:12:17,993 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 09:12:17 BoogieIcfgContainer [2023-03-31 21:12:17,993 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-03-31 21:12:17,997 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-03-31 21:12:17,997 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-03-31 21:12:18,000 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-03-31 21:12:18,000 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.03 09:12:16" (1/3) ... [2023-03-31 21:12:18,001 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7cb00e3b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 09:12:18, skipping insertion in model container [2023-03-31 21:12:18,001 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:12:16" (2/3) ... [2023-03-31 21:12:18,002 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7cb00e3b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 09:12:18, skipping insertion in model container [2023-03-31 21:12:18,002 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 09:12:17" (3/3) ... [2023-03-31 21:12:18,003 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem01_label56.c [2023-03-31 21:12:18,020 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-03-31 21:12:18,020 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-03-31 21:12:18,065 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-03-31 21:12:18,073 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;@54c12e85, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-03-31 21:12:18,073 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-03-31 21:12:18,080 INFO L276 IsEmpty]: Start isEmpty. Operand has 86 states, 78 states have (on average 1.8974358974358974) internal successors, (148), 79 states have internal predecessors, (148), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 21:12:18,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2023-03-31 21:12:18,091 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:12:18,092 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:12:18,093 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:12:18,099 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:12:18,099 INFO L85 PathProgramCache]: Analyzing trace with hash -2062188941, now seen corresponding path program 1 times [2023-03-31 21:12:18,109 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:12:18,110 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1207800542] [2023-03-31 21:12:18,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:12:18,111 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:12:18,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:12:18,800 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:12:18,801 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:12:18,801 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1207800542] [2023-03-31 21:12:18,802 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1207800542] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 21:12:18,802 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 21:12:18,802 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-03-31 21:12:18,804 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058874083] [2023-03-31 21:12:18,805 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 21:12:18,810 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-03-31 21:12:18,811 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:12:18,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-03-31 21:12:18,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 21:12:18,850 INFO L87 Difference]: Start difference. First operand has 86 states, 78 states have (on average 1.8974358974358974) internal successors, (148), 79 states have internal predecessors, (148), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 2 states have internal predecessors, (73), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 21:12:19,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:12:19,277 INFO L93 Difference]: Finished difference Result 246 states and 454 transitions. [2023-03-31 21:12:19,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-03-31 21:12:19,279 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 2 states have internal predecessors, (73), 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 77 [2023-03-31 21:12:19,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:12:19,294 INFO L225 Difference]: With dead ends: 246 [2023-03-31 21:12:19,295 INFO L226 Difference]: Without dead ends: 157 [2023-03-31 21:12:19,298 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 21:12:19,305 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 20 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 229 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 286 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 229 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-03-31 21:12:19,306 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 42 Invalid, 286 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 229 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-03-31 21:12:19,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2023-03-31 21:12:19,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 157. [2023-03-31 21:12:19,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 149 states have (on average 1.8120805369127517) internal successors, (270), 149 states have internal predecessors, (270), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2023-03-31 21:12:19,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 279 transitions. [2023-03-31 21:12:19,361 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 279 transitions. Word has length 77 [2023-03-31 21:12:19,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:12:19,362 INFO L495 AbstractCegarLoop]: Abstraction has 157 states and 279 transitions. [2023-03-31 21:12:19,362 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 2 states have internal predecessors, (73), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 21:12:19,363 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 279 transitions. [2023-03-31 21:12:19,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2023-03-31 21:12:19,366 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:12:19,366 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:12:19,367 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-03-31 21:12:19,367 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:12:19,367 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:12:19,367 INFO L85 PathProgramCache]: Analyzing trace with hash 1470074573, now seen corresponding path program 1 times [2023-03-31 21:12:19,368 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:12:19,368 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1287827736] [2023-03-31 21:12:19,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:12:19,368 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:12:19,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:12:19,674 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:12:19,675 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:12:19,675 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1287827736] [2023-03-31 21:12:19,675 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1287827736] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 21:12:19,675 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 21:12:19,675 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-03-31 21:12:19,675 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098722374] [2023-03-31 21:12:19,676 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 21:12:19,677 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-03-31 21:12:19,677 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:12:19,678 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-03-31 21:12:19,678 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-03-31 21:12:19,678 INFO L87 Difference]: Start difference. First operand 157 states and 279 transitions. Second operand has 5 states, 5 states have (on average 16.2) internal successors, (81), 4 states have internal predecessors, (81), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-03-31 21:12:20,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:12:20,112 INFO L93 Difference]: Finished difference Result 402 states and 725 transitions. [2023-03-31 21:12:20,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-03-31 21:12:20,112 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 16.2) internal successors, (81), 4 states have internal predecessors, (81), 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 87 [2023-03-31 21:12:20,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:12:20,115 INFO L225 Difference]: With dead ends: 402 [2023-03-31 21:12:20,115 INFO L226 Difference]: Without dead ends: 250 [2023-03-31 21:12:20,117 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2023-03-31 21:12:20,118 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 261 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 410 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 261 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 512 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 410 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-03-31 21:12:20,118 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [261 Valid, 43 Invalid, 512 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 410 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-03-31 21:12:20,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2023-03-31 21:12:20,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 238. [2023-03-31 21:12:20,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 238 states, 225 states have (on average 1.7244444444444444) internal successors, (388), 228 states have internal predecessors, (388), 5 states have call successors, (5), 5 states have call predecessors, (5), 7 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) [2023-03-31 21:12:20,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 407 transitions. [2023-03-31 21:12:20,135 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 407 transitions. Word has length 87 [2023-03-31 21:12:20,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:12:20,136 INFO L495 AbstractCegarLoop]: Abstraction has 238 states and 407 transitions. [2023-03-31 21:12:20,136 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 16.2) internal successors, (81), 4 states have internal predecessors, (81), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-03-31 21:12:20,136 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 407 transitions. [2023-03-31 21:12:20,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2023-03-31 21:12:20,139 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:12:20,139 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:12:20,139 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-03-31 21:12:20,140 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:12:20,140 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:12:20,140 INFO L85 PathProgramCache]: Analyzing trace with hash -1308880541, now seen corresponding path program 1 times [2023-03-31 21:12:20,140 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:12:20,141 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2135911130] [2023-03-31 21:12:20,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:12:20,141 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:12:20,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:12:20,383 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-03-31 21:12:20,384 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:12:20,384 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2135911130] [2023-03-31 21:12:20,384 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2135911130] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 21:12:20,384 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [453136454] [2023-03-31 21:12:20,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:12:20,385 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:12:20,385 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 21:12:20,391 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 21:12:20,407 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-03-31 21:12:20,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:12:20,531 INFO L262 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 4 conjunts are in the unsatisfiable core [2023-03-31 21:12:20,537 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 21:12:20,707 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:12:20,708 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-03-31 21:12:20,708 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [453136454] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 21:12:20,709 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-03-31 21:12:20,709 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2023-03-31 21:12:20,711 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [130457936] [2023-03-31 21:12:20,711 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 21:12:20,712 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-03-31 21:12:20,712 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:12:20,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-03-31 21:12:20,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-03-31 21:12:20,713 INFO L87 Difference]: Start difference. First operand 238 states and 407 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-03-31 21:12:20,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:12:20,976 INFO L93 Difference]: Finished difference Result 700 states and 1242 transitions. [2023-03-31 21:12:20,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-03-31 21:12:20,977 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 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 88 [2023-03-31 21:12:20,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:12:20,985 INFO L225 Difference]: With dead ends: 700 [2023-03-31 21:12:20,985 INFO L226 Difference]: Without dead ends: 467 [2023-03-31 21:12:20,987 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-03-31 21:12:20,990 INFO L413 NwaCegarLoop]: 153 mSDtfsCounter, 2 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 72 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 286 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 72 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-03-31 21:12:20,992 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 166 Invalid, 286 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [72 Valid, 214 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-03-31 21:12:20,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 467 states. [2023-03-31 21:12:21,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 467 to 467. [2023-03-31 21:12:21,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 467 states, 446 states have (on average 1.5269058295964126) internal successors, (681), 451 states have internal predecessors, (681), 8 states have call successors, (8), 8 states have call predecessors, (8), 12 states have return successors, (48), 7 states have call predecessors, (48), 7 states have call successors, (48) [2023-03-31 21:12:21,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 467 states to 467 states and 737 transitions. [2023-03-31 21:12:21,030 INFO L78 Accepts]: Start accepts. Automaton has 467 states and 737 transitions. Word has length 88 [2023-03-31 21:12:21,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:12:21,032 INFO L495 AbstractCegarLoop]: Abstraction has 467 states and 737 transitions. [2023-03-31 21:12:21,032 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-03-31 21:12:21,033 INFO L276 IsEmpty]: Start isEmpty. Operand 467 states and 737 transitions. [2023-03-31 21:12:21,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2023-03-31 21:12:21,040 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:12:21,041 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:12:21,053 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-03-31 21:12:21,247 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:12:21,249 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:12:21,251 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:12:21,251 INFO L85 PathProgramCache]: Analyzing trace with hash -2050519017, now seen corresponding path program 1 times [2023-03-31 21:12:21,252 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:12:21,252 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1568447559] [2023-03-31 21:12:21,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:12:21,252 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:12:21,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:12:21,549 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:12:21,549 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:12:21,549 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1568447559] [2023-03-31 21:12:21,549 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1568447559] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 21:12:21,549 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 21:12:21,550 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-03-31 21:12:21,552 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071297421] [2023-03-31 21:12:21,552 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 21:12:21,553 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-03-31 21:12:21,553 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:12:21,554 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-03-31 21:12:21,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-03-31 21:12:21,554 INFO L87 Difference]: Start difference. First operand 467 states and 737 transitions. Second operand has 5 states, 5 states have (on average 17.6) internal successors, (88), 4 states have internal predecessors, (88), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-03-31 21:12:22,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:12:22,028 INFO L93 Difference]: Finished difference Result 1358 states and 2246 transitions. [2023-03-31 21:12:22,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-03-31 21:12:22,029 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 17.6) internal successors, (88), 4 states have internal predecessors, (88), 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 94 [2023-03-31 21:12:22,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:12:22,034 INFO L225 Difference]: With dead ends: 1358 [2023-03-31 21:12:22,034 INFO L226 Difference]: Without dead ends: 730 [2023-03-31 21:12:22,036 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2023-03-31 21:12:22,042 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 241 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 402 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 537 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 402 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-03-31 21:12:22,042 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [241 Valid, 49 Invalid, 537 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 402 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-03-31 21:12:22,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 730 states. [2023-03-31 21:12:22,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 730 to 643. [2023-03-31 21:12:22,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 643 states, 605 states have (on average 1.3289256198347108) internal successors, (804), 623 states have internal predecessors, (804), 10 states have call successors, (10), 10 states have call predecessors, (10), 27 states have return successors, (88), 9 states have call predecessors, (88), 9 states have call successors, (88) [2023-03-31 21:12:22,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 643 states to 643 states and 902 transitions. [2023-03-31 21:12:22,076 INFO L78 Accepts]: Start accepts. Automaton has 643 states and 902 transitions. Word has length 94 [2023-03-31 21:12:22,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:12:22,076 INFO L495 AbstractCegarLoop]: Abstraction has 643 states and 902 transitions. [2023-03-31 21:12:22,077 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 17.6) internal successors, (88), 4 states have internal predecessors, (88), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-03-31 21:12:22,077 INFO L276 IsEmpty]: Start isEmpty. Operand 643 states and 902 transitions. [2023-03-31 21:12:22,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2023-03-31 21:12:22,083 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:12:22,083 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:12:22,084 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-03-31 21:12:22,084 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:12:22,084 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:12:22,084 INFO L85 PathProgramCache]: Analyzing trace with hash 144040439, now seen corresponding path program 1 times [2023-03-31 21:12:22,085 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:12:22,085 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [650594111] [2023-03-31 21:12:22,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:12:22,085 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:12:22,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:12:22,524 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 30 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:12:22,524 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:12:22,525 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [650594111] [2023-03-31 21:12:22,525 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [650594111] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 21:12:22,525 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 21:12:22,525 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-03-31 21:12:22,526 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958368665] [2023-03-31 21:12:22,526 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 21:12:22,528 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-03-31 21:12:22,530 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:12:22,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-03-31 21:12:22,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-03-31 21:12:22,537 INFO L87 Difference]: Start difference. First operand 643 states and 902 transitions. Second operand has 5 states, 5 states have (on average 20.8) internal successors, (104), 4 states have internal predecessors, (104), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-03-31 21:12:22,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:12:22,921 INFO L93 Difference]: Finished difference Result 1384 states and 1982 transitions. [2023-03-31 21:12:22,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-03-31 21:12:22,922 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 20.8) internal successors, (104), 4 states have internal predecessors, (104), 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 110 [2023-03-31 21:12:22,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:12:22,927 INFO L225 Difference]: With dead ends: 1384 [2023-03-31 21:12:22,927 INFO L226 Difference]: Without dead ends: 746 [2023-03-31 21:12:22,929 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2023-03-31 21:12:22,929 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 180 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 400 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 461 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 400 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-03-31 21:12:22,929 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [180 Valid, 46 Invalid, 461 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 400 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-03-31 21:12:22,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 746 states. [2023-03-31 21:12:22,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 746 to 736. [2023-03-31 21:12:22,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 736 states, 687 states have (on average 1.2940320232896652) internal successors, (889), 714 states have internal predecessors, (889), 11 states have call successors, (11), 11 states have call predecessors, (11), 37 states have return successors, (126), 10 states have call predecessors, (126), 10 states have call successors, (126) [2023-03-31 21:12:22,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 736 states to 736 states and 1026 transitions. [2023-03-31 21:12:22,960 INFO L78 Accepts]: Start accepts. Automaton has 736 states and 1026 transitions. Word has length 110 [2023-03-31 21:12:22,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:12:22,960 INFO L495 AbstractCegarLoop]: Abstraction has 736 states and 1026 transitions. [2023-03-31 21:12:22,960 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 20.8) internal successors, (104), 4 states have internal predecessors, (104), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-03-31 21:12:22,960 INFO L276 IsEmpty]: Start isEmpty. Operand 736 states and 1026 transitions. [2023-03-31 21:12:22,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2023-03-31 21:12:22,963 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:12:22,963 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:12:22,964 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-03-31 21:12:22,964 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:12:22,965 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:12:22,965 INFO L85 PathProgramCache]: Analyzing trace with hash 338295331, now seen corresponding path program 1 times [2023-03-31 21:12:22,966 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:12:22,966 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1967647552] [2023-03-31 21:12:22,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:12:22,967 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:12:23,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:12:23,263 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 67 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:12:23,264 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:12:23,264 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1967647552] [2023-03-31 21:12:23,264 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1967647552] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 21:12:23,264 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [483031166] [2023-03-31 21:12:23,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:12:23,264 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:12:23,264 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 21:12:23,265 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 21:12:23,268 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-03-31 21:12:23,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:12:23,384 INFO L262 TraceCheckSpWp]: Trace formula consists of 446 conjuncts, 7 conjunts are in the unsatisfiable core [2023-03-31 21:12:23,392 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 21:12:23,507 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-03-31 21:12:23,507 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-03-31 21:12:23,507 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [483031166] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 21:12:23,507 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-03-31 21:12:23,507 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-03-31 21:12:23,508 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995352769] [2023-03-31 21:12:23,508 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 21:12:23,508 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-03-31 21:12:23,508 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:12:23,509 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-03-31 21:12:23,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-03-31 21:12:23,509 INFO L87 Difference]: Start difference. First operand 736 states and 1026 transitions. Second operand has 3 states, 3 states have (on average 38.333333333333336) internal successors, (115), 3 states have internal predecessors, (115), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-03-31 21:12:23,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:12:23,757 INFO L93 Difference]: Finished difference Result 1929 states and 2805 transitions. [2023-03-31 21:12:23,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-03-31 21:12:23,758 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 38.333333333333336) internal successors, (115), 3 states have internal predecessors, (115), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 135 [2023-03-31 21:12:23,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:12:23,764 INFO L225 Difference]: With dead ends: 1929 [2023-03-31 21:12:23,764 INFO L226 Difference]: Without dead ends: 1198 [2023-03-31 21:12:23,766 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-03-31 21:12:23,767 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 9 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 198 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 233 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-03-31 21:12:23,767 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 39 Invalid, 233 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 198 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-03-31 21:12:23,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1198 states. [2023-03-31 21:12:23,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1198 to 1119. [2023-03-31 21:12:23,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1119 states, 1056 states have (on average 1.2840909090909092) internal successors, (1356), 1087 states have internal predecessors, (1356), 16 states have call successors, (16), 16 states have call predecessors, (16), 46 states have return successors, (218), 15 states have call predecessors, (218), 15 states have call successors, (218) [2023-03-31 21:12:23,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1119 states to 1119 states and 1590 transitions. [2023-03-31 21:12:23,849 INFO L78 Accepts]: Start accepts. Automaton has 1119 states and 1590 transitions. Word has length 135 [2023-03-31 21:12:23,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:12:23,850 INFO L495 AbstractCegarLoop]: Abstraction has 1119 states and 1590 transitions. [2023-03-31 21:12:23,850 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 38.333333333333336) internal successors, (115), 3 states have internal predecessors, (115), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-03-31 21:12:23,850 INFO L276 IsEmpty]: Start isEmpty. Operand 1119 states and 1590 transitions. [2023-03-31 21:12:23,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2023-03-31 21:12:23,854 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:12:23,854 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:12:23,863 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-03-31 21:12:24,060 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-03-31 21:12:24,061 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:12:24,061 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:12:24,061 INFO L85 PathProgramCache]: Analyzing trace with hash -1780590829, now seen corresponding path program 1 times [2023-03-31 21:12:24,062 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:12:24,062 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [32878901] [2023-03-31 21:12:24,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:12:24,062 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:12:24,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:12:24,319 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 61 proven. 2 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-03-31 21:12:24,319 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:12:24,319 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [32878901] [2023-03-31 21:12:24,319 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [32878901] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 21:12:24,319 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1691459054] [2023-03-31 21:12:24,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:12:24,320 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:12:24,320 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 21:12:24,321 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 21:12:24,324 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-03-31 21:12:24,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:12:24,440 INFO L262 TraceCheckSpWp]: Trace formula consists of 459 conjuncts, 8 conjunts are in the unsatisfiable core [2023-03-31 21:12:24,443 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 21:12:24,571 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-03-31 21:12:24,571 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-03-31 21:12:24,571 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1691459054] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 21:12:24,571 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-03-31 21:12:24,572 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 8 [2023-03-31 21:12:24,572 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [240012718] [2023-03-31 21:12:24,572 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 21:12:24,572 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-03-31 21:12:24,572 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:12:24,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-03-31 21:12:24,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-03-31 21:12:24,573 INFO L87 Difference]: Start difference. First operand 1119 states and 1590 transitions. Second operand has 5 states, 5 states have (on average 23.0) internal successors, (115), 4 states have internal predecessors, (115), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-03-31 21:12:24,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:12:24,951 INFO L93 Difference]: Finished difference Result 2986 states and 4557 transitions. [2023-03-31 21:12:24,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-03-31 21:12:24,952 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 23.0) internal successors, (115), 4 states have internal predecessors, (115), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 143 [2023-03-31 21:12:24,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:12:24,962 INFO L225 Difference]: With dead ends: 2986 [2023-03-31 21:12:24,962 INFO L226 Difference]: Without dead ends: 1947 [2023-03-31 21:12:24,965 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2023-03-31 21:12:24,966 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 227 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 334 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 385 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 334 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-03-31 21:12:24,966 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [227 Valid, 38 Invalid, 385 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 334 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-03-31 21:12:24,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1947 states. [2023-03-31 21:12:25,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1947 to 1903. [2023-03-31 21:12:25,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1903 states, 1803 states have (on average 1.242928452579035) internal successors, (2241), 1851 states have internal predecessors, (2241), 26 states have call successors, (26), 26 states have call predecessors, (26), 73 states have return successors, (360), 25 states have call predecessors, (360), 25 states have call successors, (360) [2023-03-31 21:12:25,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1903 states to 1903 states and 2627 transitions. [2023-03-31 21:12:25,058 INFO L78 Accepts]: Start accepts. Automaton has 1903 states and 2627 transitions. Word has length 143 [2023-03-31 21:12:25,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:12:25,058 INFO L495 AbstractCegarLoop]: Abstraction has 1903 states and 2627 transitions. [2023-03-31 21:12:25,059 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 23.0) internal successors, (115), 4 states have internal predecessors, (115), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-03-31 21:12:25,059 INFO L276 IsEmpty]: Start isEmpty. Operand 1903 states and 2627 transitions. [2023-03-31 21:12:25,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2023-03-31 21:12:25,063 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:12:25,064 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:12:25,072 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-03-31 21:12:25,270 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:12:25,270 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:12:25,271 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:12:25,271 INFO L85 PathProgramCache]: Analyzing trace with hash -1327844349, now seen corresponding path program 1 times [2023-03-31 21:12:25,271 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:12:25,271 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [530077967] [2023-03-31 21:12:25,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:12:25,271 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:12:25,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:12:25,590 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 62 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2023-03-31 21:12:25,591 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:12:25,591 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [530077967] [2023-03-31 21:12:25,591 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [530077967] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 21:12:25,591 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1046622278] [2023-03-31 21:12:25,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:12:25,591 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:12:25,591 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 21:12:25,593 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 21:12:25,614 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-03-31 21:12:25,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:12:25,723 INFO L262 TraceCheckSpWp]: Trace formula consists of 461 conjuncts, 4 conjunts are in the unsatisfiable core [2023-03-31 21:12:25,730 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 21:12:25,815 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 71 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-03-31 21:12:25,815 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-03-31 21:12:25,816 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1046622278] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 21:12:25,816 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-03-31 21:12:25,816 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2023-03-31 21:12:25,816 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737417056] [2023-03-31 21:12:25,816 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 21:12:25,816 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-03-31 21:12:25,817 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:12:25,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-03-31 21:12:25,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-03-31 21:12:25,817 INFO L87 Difference]: Start difference. First operand 1903 states and 2627 transitions. Second operand has 3 states, 3 states have (on average 38.333333333333336) internal successors, (115), 3 states have internal predecessors, (115), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-03-31 21:12:26,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:12:26,098 INFO L93 Difference]: Finished difference Result 4176 states and 5919 transitions. [2023-03-31 21:12:26,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-03-31 21:12:26,099 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 38.333333333333336) internal successors, (115), 3 states have internal predecessors, (115), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 151 [2023-03-31 21:12:26,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:12:26,109 INFO L225 Difference]: With dead ends: 4176 [2023-03-31 21:12:26,109 INFO L226 Difference]: Without dead ends: 2353 [2023-03-31 21:12:26,113 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 156 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-03-31 21:12:26,113 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 24 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 181 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 181 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-03-31 21:12:26,114 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 40 Invalid, 225 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 181 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-03-31 21:12:26,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2353 states. [2023-03-31 21:12:26,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2353 to 2203. [2023-03-31 21:12:26,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2203 states, 2095 states have (on average 1.2252983293556086) internal successors, (2567), 2143 states have internal predecessors, (2567), 30 states have call successors, (30), 30 states have call predecessors, (30), 77 states have return successors, (392), 29 states have call predecessors, (392), 29 states have call successors, (392) [2023-03-31 21:12:26,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2203 states to 2203 states and 2989 transitions. [2023-03-31 21:12:26,190 INFO L78 Accepts]: Start accepts. Automaton has 2203 states and 2989 transitions. Word has length 151 [2023-03-31 21:12:26,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:12:26,190 INFO L495 AbstractCegarLoop]: Abstraction has 2203 states and 2989 transitions. [2023-03-31 21:12:26,190 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 38.333333333333336) internal successors, (115), 3 states have internal predecessors, (115), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-03-31 21:12:26,190 INFO L276 IsEmpty]: Start isEmpty. Operand 2203 states and 2989 transitions. [2023-03-31 21:12:26,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2023-03-31 21:12:26,197 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:12:26,197 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:12:26,204 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-03-31 21:12:26,403 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:12:26,404 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:12:26,404 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:12:26,404 INFO L85 PathProgramCache]: Analyzing trace with hash -1557442513, now seen corresponding path program 1 times [2023-03-31 21:12:26,405 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:12:26,405 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1017154842] [2023-03-31 21:12:26,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:12:26,405 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:12:26,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:12:26,817 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 107 proven. 50 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-03-31 21:12:26,817 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:12:26,818 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1017154842] [2023-03-31 21:12:26,818 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1017154842] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 21:12:26,818 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2094825983] [2023-03-31 21:12:26,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:12:26,818 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:12:26,818 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 21:12:26,821 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 21:12:26,846 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-03-31 21:12:26,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:12:26,974 INFO L262 TraceCheckSpWp]: Trace formula consists of 546 conjuncts, 10 conjunts are in the unsatisfiable core [2023-03-31 21:12:26,979 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 21:12:27,134 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 118 proven. 2 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-03-31 21:12:27,134 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 21:12:27,667 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 107 proven. 15 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2023-03-31 21:12:27,667 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2094825983] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 21:12:27,667 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2102927337] [2023-03-31 21:12:27,690 INFO L159 IcfgInterpreter]: Started Sifa with 81 locations of interest [2023-03-31 21:12:27,691 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 21:12:27,695 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 21:12:27,700 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 21:12:27,700 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 21:12:27,900 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 72 for LOIs [2023-03-31 21:12:28,771 INFO L197 IcfgInterpreter]: Interpreting procedure calculate_output with input of size 83 for LOIs