/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/Problem17_label06.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 20:15:43,445 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 20:15:43,447 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 20:15:43,478 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 20:15:43,478 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 20:15:43,481 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 20:15:43,483 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 20:15:43,484 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 20:15:43,486 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 20:15:43,489 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 20:15:43,491 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 20:15:43,492 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 20:15:43,492 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 20:15:43,494 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 20:15:43,495 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 20:15:43,496 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 20:15:43,496 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 20:15:43,497 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 20:15:43,498 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 20:15:43,502 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 20:15:43,502 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 20:15:43,503 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 20:15:43,504 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 20:15:43,505 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 20:15:43,511 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-02 20:15:43,511 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-02 20:15:43,511 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-02 20:15:43,512 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-02 20:15:43,513 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-02 20:15:43,513 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-02 20:15:43,513 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 20:15:43,514 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 20:15:43,515 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 20:15:43,515 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 20:15:43,515 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 20:15:43,516 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 20:15:43,516 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 20:15:43,516 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 20:15:43,516 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 20:15:43,517 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 20:15:43,517 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 20:15:43,518 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 [2023-04-02 20:15:43,541 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 20:15:43,542 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 20:15:43,542 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 20:15:43,542 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 20:15:43,543 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 20:15:43,543 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 20:15:43,543 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 20:15:43,543 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 20:15:43,543 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 20:15:43,543 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 20:15:43,544 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 20:15:43,544 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 20:15:43,544 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 20:15:43,544 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 20:15:43,544 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 20:15:43,544 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 20:15:43,544 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 20:15:43,544 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 20:15:43,545 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 20:15:43,545 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 20:15:43,545 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 20:15:43,545 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 20:15:43,545 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 20:15:43,545 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 20:15:43,545 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 20:15:43,545 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 20:15:43,546 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 20:15:43,546 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 20:15:43,546 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 20:15:43,546 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 20:15:43,546 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 20:15:43,546 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 20:15:43,546 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 20:15:43,547 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 20:15:43,547 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 20:15:43,547 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 20:15:43,547 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 20:15:43,547 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 20:15:43,547 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 20:15:43,547 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 20:15:43,547 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 20:15:43,547 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 20:15:43,700 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 20:15:43,715 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 20:15:43,716 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 20:15:43,717 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 20:15:43,718 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 20:15:43,719 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/eca-rers2012/Problem17_label06.c [2023-04-02 20:15:44,715 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 20:15:45,026 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 20:15:45,027 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem17_label06.c [2023-04-02 20:15:45,048 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d71c71401/3f6d993e378e45d8a425929705b979f6/FLAG5739f4640 [2023-04-02 20:15:45,062 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d71c71401/3f6d993e378e45d8a425929705b979f6 [2023-04-02 20:15:45,064 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 20:15:45,065 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 20:15:45,068 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 20:15:45,068 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 20:15:45,070 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 20:15:45,071 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 08:15:45" (1/1) ... [2023-04-02 20:15:45,072 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@691a134f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 08:15:45, skipping insertion in model container [2023-04-02 20:15:45,072 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 08:15:45" (1/1) ... [2023-04-02 20:15:45,078 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 20:15:45,158 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 20:15:45,316 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/Problem17_label06.c[4782,4795] [2023-04-02 20:15:45,770 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 20:15:45,778 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 20:15:45,799 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/Problem17_label06.c[4782,4795] [2023-04-02 20:15:45,949 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 20:15:45,961 INFO L208 MainTranslator]: Completed translation [2023-04-02 20:15:45,961 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 08:15:45 WrapperNode [2023-04-02 20:15:45,961 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 20:15:45,962 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 20:15:45,963 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 20:15:45,963 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 20:15:45,970 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 08:15:45" (1/1) ... [2023-04-02 20:15:45,970 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 08:15:45" (1/1) ... [2023-04-02 20:15:46,010 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 08:15:45" (1/1) ... [2023-04-02 20:15:46,011 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 08:15:45" (1/1) ... [2023-04-02 20:15:46,068 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 08:15:45" (1/1) ... [2023-04-02 20:15:46,084 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 08:15:45" (1/1) ... [2023-04-02 20:15:46,112 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 08:15:45" (1/1) ... [2023-04-02 20:15:46,119 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 08:15:45" (1/1) ... [2023-04-02 20:15:46,137 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 20:15:46,138 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 20:15:46,138 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 20:15:46,138 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 20:15:46,139 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 08:15:45" (1/1) ... [2023-04-02 20:15:46,144 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 20:15:46,150 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 20:15:46,170 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) [2023-04-02 20:15:46,173 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 [2023-04-02 20:15:46,194 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 20:15:46,194 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 20:15:46,194 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 20:15:46,194 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2023-04-02 20:15:46,194 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2023-04-02 20:15:46,194 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 20:15:46,194 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2023-04-02 20:15:46,194 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2023-04-02 20:15:46,194 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 20:15:46,194 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 20:15:46,194 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 20:15:46,194 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 20:15:46,195 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-02 20:15:46,195 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2023-04-02 20:15:46,195 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 20:15:46,195 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 20:15:46,195 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 20:15:46,195 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 20:15:46,195 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 20:15:46,195 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 20:15:46,195 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 20:15:46,244 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 20:15:46,245 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 20:15:48,613 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 20:15:56,780 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 20:15:56,781 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-04-02 20:15:56,783 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 08:15:56 BoogieIcfgContainer [2023-04-02 20:15:56,783 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 20:15:56,785 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 20:15:56,785 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 20:15:56,787 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 20:15:56,787 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 08:15:45" (1/3) ... [2023-04-02 20:15:56,787 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2dbf1c14 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 08:15:56, skipping insertion in model container [2023-04-02 20:15:56,787 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 08:15:45" (2/3) ... [2023-04-02 20:15:56,788 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2dbf1c14 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 08:15:56, skipping insertion in model container [2023-04-02 20:15:56,788 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 08:15:56" (3/3) ... [2023-04-02 20:15:56,789 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem17_label06.c [2023-04-02 20:15:56,805 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 20:15:56,805 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 20:15:56,842 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 20:15:56,847 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;@6c29dde9, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 20:15:56,847 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 20:15:56,851 INFO L276 IsEmpty]: Start isEmpty. Operand has 244 states, 234 states have (on average 1.9572649572649572) internal successors, (458), 235 states have internal predecessors, (458), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-02 20:15:56,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-04-02 20:15:56,855 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 20:15:56,856 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 20:15:56,856 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 20:15:56,859 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 20:15:56,859 INFO L85 PathProgramCache]: Analyzing trace with hash -2084312343, now seen corresponding path program 1 times [2023-04-02 20:15:56,865 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 20:15:56,866 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [538398245] [2023-04-02 20:15:56,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 20:15:56,866 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 20:15:56,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 20:15:57,101 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 20:15:57,101 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 20:15:57,101 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [538398245] [2023-04-02 20:15:57,102 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [538398245] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 20:15:57,102 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 20:15:57,102 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-02 20:15:57,103 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492352357] [2023-04-02 20:15:57,104 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 20:15:57,107 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-02 20:15:57,107 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 20:15:57,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-02 20:15:57,132 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 20:15:57,136 INFO L87 Difference]: Start difference. First operand has 244 states, 234 states have (on average 1.9572649572649572) internal successors, (458), 235 states have internal predecessors, (458), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 20:15:58,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 20:15:58,551 INFO L93 Difference]: Finished difference Result 718 states and 1389 transitions. [2023-04-02 20:15:58,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-02 20:15:58,552 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2023-04-02 20:15:58,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 20:15:58,561 INFO L225 Difference]: With dead ends: 718 [2023-04-02 20:15:58,561 INFO L226 Difference]: Without dead ends: 471 [2023-04-02 20:15:58,581 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 [2023-04-02 20:15:58,583 INFO L413 NwaCegarLoop]: 180 mSDtfsCounter, 242 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 704 mSolverCounterSat, 209 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 242 SdHoareTripleChecker+Valid, 195 SdHoareTripleChecker+Invalid, 913 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 209 IncrementalHoareTripleChecker+Valid, 704 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2023-04-02 20:15:58,584 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [242 Valid, 195 Invalid, 913 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [209 Valid, 704 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2023-04-02 20:15:58,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 471 states. [2023-04-02 20:15:58,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 471 to 469. [2023-04-02 20:15:58,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 459 states have (on average 1.5751633986928104) internal successors, (723), 459 states have internal predecessors, (723), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2023-04-02 20:15:58,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 734 transitions. [2023-04-02 20:15:58,627 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 734 transitions. Word has length 11 [2023-04-02 20:15:58,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 20:15:58,627 INFO L495 AbstractCegarLoop]: Abstraction has 469 states and 734 transitions. [2023-04-02 20:15:58,628 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 20:15:58,628 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 734 transitions. [2023-04-02 20:15:58,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-04-02 20:15:58,629 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 20:15:58,629 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 20:15:58,629 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 20:15:58,629 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 20:15:58,629 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 20:15:58,630 INFO L85 PathProgramCache]: Analyzing trace with hash 1535920207, now seen corresponding path program 1 times [2023-04-02 20:15:58,630 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 20:15:58,630 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1870428192] [2023-04-02 20:15:58,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 20:15:58,630 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 20:15:58,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 20:15:58,762 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 20:15:58,762 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 20:15:58,762 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1870428192] [2023-04-02 20:15:58,762 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1870428192] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 20:15:58,762 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 20:15:58,762 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-02 20:15:58,763 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1722532327] [2023-04-02 20:15:58,763 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 20:15:58,764 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-02 20:15:58,764 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 20:15:58,764 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-02 20:15:58,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 20:15:58,764 INFO L87 Difference]: Start difference. First operand 469 states and 734 transitions. Second operand has 3 states, 3 states have (on average 6.666666666666667) internal successors, (20), 3 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 20:16:00,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 20:16:00,672 INFO L93 Difference]: Finished difference Result 1393 states and 2202 transitions. [2023-04-02 20:16:00,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-02 20:16:00,673 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.666666666666667) internal successors, (20), 3 states have internal predecessors, (20), 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 26 [2023-04-02 20:16:00,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 20:16:00,677 INFO L225 Difference]: With dead ends: 1393 [2023-04-02 20:16:00,678 INFO L226 Difference]: Without dead ends: 929 [2023-04-02 20:16:00,679 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 20:16:00,680 INFO L413 NwaCegarLoop]: 394 mSDtfsCounter, 243 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 681 mSolverCounterSat, 262 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 243 SdHoareTripleChecker+Valid, 410 SdHoareTripleChecker+Invalid, 943 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 262 IncrementalHoareTripleChecker+Valid, 681 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2023-04-02 20:16:00,680 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [243 Valid, 410 Invalid, 943 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [262 Valid, 681 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2023-04-02 20:16:00,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 929 states. [2023-04-02 20:16:00,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 929 to 906. [2023-04-02 20:16:00,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 906 states, 892 states have (on average 1.3934977578475336) internal successors, (1243), 892 states have internal predecessors, (1243), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (18), 6 states have call predecessors, (18), 6 states have call successors, (18) [2023-04-02 20:16:00,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 906 states to 906 states and 1268 transitions. [2023-04-02 20:16:00,740 INFO L78 Accepts]: Start accepts. Automaton has 906 states and 1268 transitions. Word has length 26 [2023-04-02 20:16:00,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 20:16:00,741 INFO L495 AbstractCegarLoop]: Abstraction has 906 states and 1268 transitions. [2023-04-02 20:16:00,741 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 6.666666666666667) internal successors, (20), 3 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 20:16:00,741 INFO L276 IsEmpty]: Start isEmpty. Operand 906 states and 1268 transitions. [2023-04-02 20:16:00,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-04-02 20:16:00,742 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 20:16:00,742 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 20:16:00,742 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-02 20:16:00,742 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 20:16:00,743 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 20:16:00,743 INFO L85 PathProgramCache]: Analyzing trace with hash -790397681, now seen corresponding path program 1 times [2023-04-02 20:16:00,743 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 20:16:00,743 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1054049187] [2023-04-02 20:16:00,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 20:16:00,743 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 20:16:00,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 20:16:00,909 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-04-02 20:16:00,909 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 20:16:00,909 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1054049187] [2023-04-02 20:16:00,909 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1054049187] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 20:16:00,910 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [971721231] [2023-04-02 20:16:00,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 20:16:00,910 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 20:16:00,910 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 20:16:00,912 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) [2023-04-02 20:16:00,913 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-02 20:16:00,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 20:16:00,993 INFO L262 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-02 20:16:00,997 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 20:16:01,104 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 20:16:01,105 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 20:16:01,172 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 20:16:01,173 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [971721231] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 20:16:01,173 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1004376456] [2023-04-02 20:16:01,187 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-02 20:16:01,187 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 20:16:01,189 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 20:16:01,192 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 20:16:01,196 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 20:16:01,348 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 50 for LOIs [2023-04-02 20:16:01,544 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 25 [2023-04-02 20:16:01,777 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 13743 conjuctions. This might take some time... [2023-04-02 20:16:02,225 INFO L192 XnfTransformerHelper]: Simplified to disjunction of 371 conjuctions. [2023-04-02 20:16:08,070 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 36