/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain OctagonDomain -i ../sv-benchmarks/c/eca-rers2012/Problem03_label06.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 03:20:05,538 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 03:20:05,540 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 03:20:05,567 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 03:20:05,567 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 03:20:05,568 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 03:20:05,569 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 03:20:05,571 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 03:20:05,572 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 03:20:05,573 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 03:20:05,574 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 03:20:05,575 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 03:20:05,575 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 03:20:05,576 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 03:20:05,577 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 03:20:05,577 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 03:20:05,578 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 03:20:05,579 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 03:20:05,580 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 03:20:05,582 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 03:20:05,583 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 03:20:05,586 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 03:20:05,587 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 03:20:05,588 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 03:20:05,591 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 03:20:05,591 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 03:20:05,592 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 03:20:05,592 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 03:20:05,593 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 03:20:05,594 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 03:20:05,594 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 03:20:05,594 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 03:20:05,595 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 03:20:05,604 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 03:20:05,605 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 03:20:05,605 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 03:20:05,606 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 03:20:05,606 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 03:20:05,606 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 03:20:05,609 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 03:20:05,609 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 03:20:05,611 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-01 03:20:05,640 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 03:20:05,640 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 03:20:05,644 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 03:20:05,644 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 03:20:05,645 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 03:20:05,645 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 03:20:05,645 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 03:20:05,645 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 03:20:05,646 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 03:20:05,646 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 03:20:05,647 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 03:20:05,647 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 03:20:05,647 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 03:20:05,647 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 03:20:05,647 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 03:20:05,647 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 03:20:05,647 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 03:20:05,648 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 03:20:05,648 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 03:20:05,649 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 03:20:05,649 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 03:20:05,649 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 03:20:05,649 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 03:20:05,649 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 03:20:05,649 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 03:20:05,650 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 03:20:05,650 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 03:20:05,650 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 03:20:05,650 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 03:20:05,650 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 03:20:05,650 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 03:20:05,651 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 03:20:05,651 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 03:20:05,651 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 03:20:05,651 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 03:20:05,651 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 03:20:05,651 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 03:20:05,651 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 03:20:05,652 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 03:20:05,652 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 03:20:05,652 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 03:20:05,652 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-01 03:20:05,881 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 03:20:05,908 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 03:20:05,910 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 03:20:05,911 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 03:20:05,912 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 03:20:05,913 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/eca-rers2012/Problem03_label06.c [2023-04-01 03:20:07,181 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 03:20:07,537 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 03:20:07,538 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem03_label06.c [2023-04-01 03:20:07,556 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a01fde118/073c0a64e7db4dd9ba7ac5e779e59b95/FLAG8ca4ae16b [2023-04-01 03:20:07,571 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a01fde118/073c0a64e7db4dd9ba7ac5e779e59b95 [2023-04-01 03:20:07,574 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 03:20:07,577 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 03:20:07,582 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 03:20:07,582 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 03:20:07,587 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 03:20:07,587 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 03:20:07" (1/1) ... [2023-04-01 03:20:07,589 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2db0c21b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 03:20:07, skipping insertion in model container [2023-04-01 03:20:07,589 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 03:20:07" (1/1) ... [2023-04-01 03:20:07,595 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 03:20:07,669 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 03:20:08,209 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/Problem03_label06.c[57034,57047] [2023-04-01 03:20:08,249 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 03:20:08,262 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 03:20:08,490 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/Problem03_label06.c[57034,57047] [2023-04-01 03:20:08,503 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 03:20:08,521 INFO L208 MainTranslator]: Completed translation [2023-04-01 03:20:08,521 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 03:20:08 WrapperNode [2023-04-01 03:20:08,522 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 03:20:08,523 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 03:20:08,524 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 03:20:08,524 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 03:20:08,535 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 03:20:08" (1/1) ... [2023-04-01 03:20:08,535 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 03:20:08" (1/1) ... [2023-04-01 03:20:08,571 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 03:20:08" (1/1) ... [2023-04-01 03:20:08,571 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 03:20:08" (1/1) ... [2023-04-01 03:20:08,644 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 03:20:08" (1/1) ... [2023-04-01 03:20:08,653 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 03:20:08" (1/1) ... [2023-04-01 03:20:08,669 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 03:20:08" (1/1) ... [2023-04-01 03:20:08,676 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 03:20:08" (1/1) ... [2023-04-01 03:20:08,693 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 03:20:08,694 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 03:20:08,694 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 03:20:08,694 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 03:20:08,696 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 03:20:08" (1/1) ... [2023-04-01 03:20:08,702 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 03:20:08,712 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 03:20:08,724 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-01 03:20:08,733 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-01 03:20:08,762 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 03:20:08,762 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 03:20:08,762 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 03:20:08,763 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2023-04-01 03:20:08,763 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 03:20:08,763 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2023-04-01 03:20:08,763 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 03:20:08,763 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 03:20:08,763 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 03:20:08,763 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 03:20:08,763 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 03:20:08,764 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2023-04-01 03:20:08,764 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 03:20:08,764 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 03:20:08,764 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 03:20:08,764 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 03:20:08,764 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 03:20:08,764 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 03:20:08,764 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 03:20:08,840 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 03:20:08,842 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 03:20:10,473 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 03:20:10,844 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 03:20:10,844 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-04-01 03:20:10,847 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 03:20:10 BoogieIcfgContainer [2023-04-01 03:20:10,847 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 03:20:10,850 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 03:20:10,850 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 03:20:10,853 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 03:20:10,853 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 03:20:07" (1/3) ... [2023-04-01 03:20:10,854 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3afabd22 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 03:20:10, skipping insertion in model container [2023-04-01 03:20:10,854 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 03:20:08" (2/3) ... [2023-04-01 03:20:10,854 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3afabd22 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 03:20:10, skipping insertion in model container [2023-04-01 03:20:10,854 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 03:20:10" (3/3) ... [2023-04-01 03:20:10,858 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem03_label06.c [2023-04-01 03:20:10,874 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 03:20:10,874 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 03:20:10,930 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 03:20:10,937 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;@1ecb827b, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 03:20:10,937 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 03:20:10,943 INFO L276 IsEmpty]: Start isEmpty. Operand has 158 states, 150 states have (on average 1.9466666666666668) internal successors, (292), 151 states have internal predecessors, (292), 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) [2023-04-01 03:20:10,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2023-04-01 03:20:10,961 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 03:20:10,962 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 03:20:10,963 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 03:20:10,970 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 03:20:10,970 INFO L85 PathProgramCache]: Analyzing trace with hash 597533107, now seen corresponding path program 1 times [2023-04-01 03:20:10,979 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 03:20:10,979 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1560336503] [2023-04-01 03:20:10,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 03:20:10,980 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 03:20:11,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 03:20:12,166 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 03:20:12,167 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 03:20:12,168 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1560336503] [2023-04-01 03:20:12,168 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1560336503] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 03:20:12,169 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 03:20:12,169 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 03:20:12,171 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1326933693] [2023-04-01 03:20:12,172 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 03:20:12,177 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 03:20:12,177 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 03:20:12,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 03:20:12,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 03:20:12,216 INFO L87 Difference]: Start difference. First operand has 158 states, 150 states have (on average 1.9466666666666668) internal successors, (292), 151 states have internal predecessors, (292), 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 48.333333333333336) internal successors, (145), 2 states have internal predecessors, (145), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 03:20:13,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 03:20:13,043 INFO L93 Difference]: Finished difference Result 462 states and 886 transitions. [2023-04-01 03:20:13,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 03:20:13,045 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 48.333333333333336) internal successors, (145), 2 states have internal predecessors, (145), 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 149 [2023-04-01 03:20:13,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 03:20:13,065 INFO L225 Difference]: With dead ends: 462 [2023-04-01 03:20:13,065 INFO L226 Difference]: Without dead ends: 301 [2023-04-01 03:20:13,070 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 03:20:13,073 INFO L413 NwaCegarLoop]: 55 mSDtfsCounter, 43 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 506 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 576 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 506 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-04-01 03:20:13,074 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 68 Invalid, 576 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 506 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-04-01 03:20:13,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2023-04-01 03:20:13,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 301. [2023-04-01 03:20:13,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 301 states, 293 states have (on average 1.7918088737201365) internal successors, (525), 293 states have internal predecessors, (525), 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) [2023-04-01 03:20:13,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 534 transitions. [2023-04-01 03:20:13,130 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 534 transitions. Word has length 149 [2023-04-01 03:20:13,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 03:20:13,131 INFO L495 AbstractCegarLoop]: Abstraction has 301 states and 534 transitions. [2023-04-01 03:20:13,131 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 48.333333333333336) internal successors, (145), 2 states have internal predecessors, (145), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 03:20:13,131 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 534 transitions. [2023-04-01 03:20:13,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2023-04-01 03:20:13,135 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 03:20:13,135 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 03:20:13,135 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 03:20:13,136 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 03:20:13,136 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 03:20:13,136 INFO L85 PathProgramCache]: Analyzing trace with hash 15707757, now seen corresponding path program 1 times [2023-04-01 03:20:13,137 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 03:20:13,151 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [827731088] [2023-04-01 03:20:13,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 03:20:13,152 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 03:20:13,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 03:20:13,789 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 03:20:13,789 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 03:20:13,790 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [827731088] [2023-04-01 03:20:13,790 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [827731088] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 03:20:13,791 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 03:20:13,791 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-01 03:20:13,791 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824116912] [2023-04-01 03:20:13,791 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 03:20:13,794 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-01 03:20:13,794 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 03:20:13,795 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-01 03:20:13,795 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-01 03:20:13,796 INFO L87 Difference]: Start difference. First operand 301 states and 534 transitions. Second operand has 5 states, 5 states have (on average 30.4) internal successors, (152), 4 states have internal predecessors, (152), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 03:20:14,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 03:20:14,238 INFO L93 Difference]: Finished difference Result 913 states and 1633 transitions. [2023-04-01 03:20:14,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-01 03:20:14,239 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 30.4) internal successors, (152), 4 states have internal predecessors, (152), 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 158 [2023-04-01 03:20:14,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 03:20:14,244 INFO L225 Difference]: With dead ends: 913 [2023-04-01 03:20:14,245 INFO L226 Difference]: Without dead ends: 617 [2023-04-01 03:20:14,246 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-04-01 03:20:14,248 INFO L413 NwaCegarLoop]: 181 mSDtfsCounter, 774 mSDsluCounter, 347 mSDsCounter, 0 mSdLazyCounter, 336 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 774 SdHoareTripleChecker+Valid, 528 SdHoareTripleChecker+Invalid, 436 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 336 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-01 03:20:14,248 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [774 Valid, 528 Invalid, 436 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 336 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-01 03:20:14,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 617 states. [2023-04-01 03:20:14,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 617 to 605. [2023-04-01 03:20:14,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 605 states, 588 states have (on average 1.7789115646258504) internal successors, (1046), 593 states have internal predecessors, (1046), 6 states have call successors, (6), 6 states have call predecessors, (6), 10 states have return successors, (22), 5 states have call predecessors, (22), 5 states have call successors, (22) [2023-04-01 03:20:14,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 605 states to 605 states and 1074 transitions. [2023-04-01 03:20:14,320 INFO L78 Accepts]: Start accepts. Automaton has 605 states and 1074 transitions. Word has length 158 [2023-04-01 03:20:14,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 03:20:14,327 INFO L495 AbstractCegarLoop]: Abstraction has 605 states and 1074 transitions. [2023-04-01 03:20:14,328 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 30.4) internal successors, (152), 4 states have internal predecessors, (152), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 03:20:14,328 INFO L276 IsEmpty]: Start isEmpty. Operand 605 states and 1074 transitions. [2023-04-01 03:20:14,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2023-04-01 03:20:14,334 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 03:20:14,334 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 03:20:14,335 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-01 03:20:14,335 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 03:20:14,335 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 03:20:14,335 INFO L85 PathProgramCache]: Analyzing trace with hash -848549486, now seen corresponding path program 1 times [2023-04-01 03:20:14,336 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 03:20:14,336 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [916557474] [2023-04-01 03:20:14,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 03:20:14,336 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 03:20:14,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 03:20:14,818 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 03:20:14,818 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 03:20:14,819 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [916557474] [2023-04-01 03:20:14,819 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [916557474] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 03:20:14,820 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 03:20:14,820 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-01 03:20:14,820 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779732943] [2023-04-01 03:20:14,820 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 03:20:14,821 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-01 03:20:14,821 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 03:20:14,822 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-01 03:20:14,823 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-01 03:20:14,823 INFO L87 Difference]: Start difference. First operand 605 states and 1074 transitions. Second operand has 5 states, 5 states have (on average 31.0) internal successors, (155), 4 states have internal predecessors, (155), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 03:20:15,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 03:20:15,669 INFO L93 Difference]: Finished difference Result 1861 states and 3379 transitions. [2023-04-01 03:20:15,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-01 03:20:15,670 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 31.0) internal successors, (155), 4 states have internal predecessors, (155), 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 161 [2023-04-01 03:20:15,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 03:20:15,678 INFO L225 Difference]: With dead ends: 1861 [2023-04-01 03:20:15,678 INFO L226 Difference]: Without dead ends: 1261 [2023-04-01 03:20:15,684 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2023-04-01 03:20:15,686 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 491 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 872 mSolverCounterSat, 256 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 491 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 1128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 256 IncrementalHoareTripleChecker+Valid, 872 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-04-01 03:20:15,687 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [491 Valid, 44 Invalid, 1128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [256 Valid, 872 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-04-01 03:20:15,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1261 states. [2023-04-01 03:20:15,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1261 to 1233. [2023-04-01 03:20:15,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1233 states, 1188 states have (on average 1.7171717171717171) internal successors, (2040), 1213 states have internal predecessors, (2040), 10 states have call successors, (10), 10 states have call predecessors, (10), 34 states have return successors, (102), 9 states have call predecessors, (102), 9 states have call successors, (102) [2023-04-01 03:20:15,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1233 states to 1233 states and 2152 transitions. [2023-04-01 03:20:15,746 INFO L78 Accepts]: Start accepts. Automaton has 1233 states and 2152 transitions. Word has length 161 [2023-04-01 03:20:15,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 03:20:15,747 INFO L495 AbstractCegarLoop]: Abstraction has 1233 states and 2152 transitions. [2023-04-01 03:20:15,747 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 31.0) internal successors, (155), 4 states have internal predecessors, (155), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 03:20:15,747 INFO L276 IsEmpty]: Start isEmpty. Operand 1233 states and 2152 transitions. [2023-04-01 03:20:15,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2023-04-01 03:20:15,754 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 03:20:15,754 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 03:20:15,754 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-04-01 03:20:15,755 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 03:20:15,756 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 03:20:15,756 INFO L85 PathProgramCache]: Analyzing trace with hash 555685507, now seen corresponding path program 1 times [2023-04-01 03:20:15,756 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 03:20:15,756 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [790587470] [2023-04-01 03:20:15,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 03:20:15,757 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 03:20:15,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 03:20:16,176 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 03:20:16,176 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 03:20:16,177 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [790587470] [2023-04-01 03:20:16,177 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [790587470] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 03:20:16,177 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [160073592] [2023-04-01 03:20:16,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 03:20:16,177 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 03:20:16,177 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 03:20:16,181 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 03:20:16,183 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-01 03:20:16,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 03:20:16,507 INFO L262 TraceCheckSpWp]: Trace formula consists of 1048 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-01 03:20:16,518 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 03:20:16,627 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-04-01 03:20:16,627 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-01 03:20:16,627 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [160073592] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 03:20:16,627 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-01 03:20:16,627 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 8 [2023-04-01 03:20:16,628 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [601415891] [2023-04-01 03:20:16,628 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 03:20:16,628 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-01 03:20:16,628 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 03:20:16,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-01 03:20:16,629 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-04-01 03:20:16,629 INFO L87 Difference]: Start difference. First operand 1233 states and 2152 transitions. Second operand has 5 states, 5 states have (on average 32.4) internal successors, (162), 4 states have internal predecessors, (162), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 03:20:17,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 03:20:17,620 INFO L93 Difference]: Finished difference Result 3789 states and 6882 transitions. [2023-04-01 03:20:17,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-01 03:20:17,623 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 32.4) internal successors, (162), 4 states have internal predecessors, (162), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 175 [2023-04-01 03:20:17,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 03:20:17,646 INFO L225 Difference]: With dead ends: 3789 [2023-04-01 03:20:17,647 INFO L226 Difference]: Without dead ends: 2561 [2023-04-01 03:20:17,651 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2023-04-01 03:20:17,656 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 509 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 905 mSolverCounterSat, 177 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 509 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 1082 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 177 IncrementalHoareTripleChecker+Valid, 905 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-04-01 03:20:17,657 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [509 Valid, 38 Invalid, 1082 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [177 Valid, 905 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-04-01 03:20:17,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2561 states. [2023-04-01 03:20:17,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2561 to 2539. [2023-04-01 03:20:17,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2539 states, 2413 states have (on average 1.5893079154579361) internal successors, (3835), 2503 states have internal predecessors, (3835), 18 states have call successors, (18), 18 states have call predecessors, (18), 107 states have return successors, (419), 17 states have call predecessors, (419), 17 states have call successors, (419) [2023-04-01 03:20:17,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2539 states to 2539 states and 4272 transitions. [2023-04-01 03:20:17,763 INFO L78 Accepts]: Start accepts. Automaton has 2539 states and 4272 transitions. Word has length 175 [2023-04-01 03:20:17,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 03:20:17,764 INFO L495 AbstractCegarLoop]: Abstraction has 2539 states and 4272 transitions. [2023-04-01 03:20:17,764 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 32.4) internal successors, (162), 4 states have internal predecessors, (162), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 03:20:17,764 INFO L276 IsEmpty]: Start isEmpty. Operand 2539 states and 4272 transitions. [2023-04-01 03:20:17,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2023-04-01 03:20:17,772 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 03:20:17,772 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 03:20:17,788 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-01 03:20:17,985 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 03:20:17,985 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 03:20:17,986 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 03:20:17,986 INFO L85 PathProgramCache]: Analyzing trace with hash -1395160217, now seen corresponding path program 1 times [2023-04-01 03:20:17,986 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 03:20:17,986 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [765867545] [2023-04-01 03:20:17,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 03:20:17,987 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 03:20:18,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 03:20:18,347 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 35 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 03:20:18,347 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 03:20:18,349 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [765867545] [2023-04-01 03:20:18,349 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [765867545] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 03:20:18,349 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [880026767] [2023-04-01 03:20:18,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 03:20:18,350 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 03:20:18,351 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 03:20:18,355 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 03:20:18,381 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-01 03:20:18,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 03:20:18,601 INFO L262 TraceCheckSpWp]: Trace formula consists of 1044 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-01 03:20:18,608 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 03:20:18,658 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 35 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 03:20:18,658 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 03:20:18,765 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 35 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 03:20:18,766 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [880026767] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 03:20:18,767 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1224851832] [2023-04-01 03:20:18,793 INFO L159 IcfgInterpreter]: Started Sifa with 153 locations of interest [2023-04-01 03:20:18,793 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 03:20:18,796 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 03:20:18,801 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 03:20:18,801 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 03:20:19,622 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 162 for LOIs [2023-04-01 03:20:30,727 WARN L223 SmtUtils]: Spent 9.73s on a formula simplification that was a NOOP. DAG size: 962 (called from [L 212] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.xJunctTerm)