/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/seq-mthreaded-reduced/pals_lcr.3.ufo.BOUNDED-6.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 06:36:57,886 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 06:36:57,889 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 06:36:57,932 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 06:36:57,932 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 06:36:57,935 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 06:36:57,938 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 06:36:57,941 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 06:36:57,943 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 06:36:57,948 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 06:36:57,950 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 06:36:57,951 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 06:36:57,952 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 06:36:57,954 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 06:36:57,957 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 06:36:57,958 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 06:36:57,958 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 06:36:57,959 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 06:36:57,961 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 06:36:57,966 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 06:36:57,967 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 06:36:57,968 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 06:36:57,970 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 06:36:57,971 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 06:36:57,979 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 06:36:57,979 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 06:36:57,980 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 06:36:57,981 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 06:36:57,982 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 06:36:57,982 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 06:36:57,983 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 06:36:57,983 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 06:36:57,984 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 06:36:57,985 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 06:36:57,986 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 06:36:57,986 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 06:36:57,986 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 06:36:57,986 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 06:36:57,987 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 06:36:57,987 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 06:36:57,988 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 06:36:57,989 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 06:36:58,016 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 06:36:58,016 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 06:36:58,017 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 06:36:58,017 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 06:36:58,018 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 06:36:58,018 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 06:36:58,018 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 06:36:58,018 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 06:36:58,018 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 06:36:58,018 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 06:36:58,019 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 06:36:58,019 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 06:36:58,020 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 06:36:58,020 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 06:36:58,020 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 06:36:58,020 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 06:36:58,020 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 06:36:58,020 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 06:36:58,021 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 06:36:58,021 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 06:36:58,021 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 06:36:58,021 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 06:36:58,022 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 06:36:58,022 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 06:36:58,022 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 06:36:58,022 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 06:36:58,023 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 06:36:58,023 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 06:36:58,023 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 06:36:58,023 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 06:36:58,023 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 06:36:58,023 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 06:36:58,024 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 06:36:58,024 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 06:36:58,024 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 06:36:58,024 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 06:36:58,024 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 06:36:58,024 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 06:36:58,025 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 06:36:58,025 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 06:36:58,025 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 06:36:58,025 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-01 06:36:58,246 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 06:36:58,271 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 06:36:58,273 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 06:36:58,275 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 06:36:58,275 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 06:36:58,276 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.ufo.BOUNDED-6.pals.c.v+nlh-reducer.c [2023-04-01 06:36:59,491 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 06:36:59,722 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 06:36:59,722 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.ufo.BOUNDED-6.pals.c.v+nlh-reducer.c [2023-04-01 06:36:59,730 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cba555b28/c124b862b9ed4652a62eabf6be8fe7d2/FLAGa0633ff15 [2023-04-01 06:36:59,743 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cba555b28/c124b862b9ed4652a62eabf6be8fe7d2 [2023-04-01 06:36:59,745 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 06:36:59,746 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 06:36:59,747 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 06:36:59,748 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 06:36:59,751 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 06:36:59,751 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 06:36:59" (1/1) ... [2023-04-01 06:36:59,752 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1e309ed9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:36:59, skipping insertion in model container [2023-04-01 06:36:59,752 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 06:36:59" (1/1) ... [2023-04-01 06:36:59,758 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 06:36:59,792 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 06:36:59,958 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/seq-mthreaded-reduced/pals_lcr.3.ufo.BOUNDED-6.pals.c.v+nlh-reducer.c[7180,7193] [2023-04-01 06:36:59,971 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/seq-mthreaded-reduced/pals_lcr.3.ufo.BOUNDED-6.pals.c.v+nlh-reducer.c[9491,9504] [2023-04-01 06:36:59,989 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 06:37:00,003 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 06:37:00,058 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/seq-mthreaded-reduced/pals_lcr.3.ufo.BOUNDED-6.pals.c.v+nlh-reducer.c[7180,7193] [2023-04-01 06:37:00,081 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/seq-mthreaded-reduced/pals_lcr.3.ufo.BOUNDED-6.pals.c.v+nlh-reducer.c[9491,9504] [2023-04-01 06:37:00,087 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 06:37:00,108 INFO L208 MainTranslator]: Completed translation [2023-04-01 06:37:00,109 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:37:00 WrapperNode [2023-04-01 06:37:00,109 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 06:37:00,110 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 06:37:00,110 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 06:37:00,110 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 06:37:00,121 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:37:00" (1/1) ... [2023-04-01 06:37:00,122 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:37:00" (1/1) ... [2023-04-01 06:37:00,130 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:37:00" (1/1) ... [2023-04-01 06:37:00,130 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:37:00" (1/1) ... [2023-04-01 06:37:00,148 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:37:00" (1/1) ... [2023-04-01 06:37:00,162 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:37:00" (1/1) ... [2023-04-01 06:37:00,173 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:37:00" (1/1) ... [2023-04-01 06:37:00,174 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:37:00" (1/1) ... [2023-04-01 06:37:00,177 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 06:37:00,178 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 06:37:00,178 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 06:37:00,178 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 06:37:00,181 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:37:00" (1/1) ... [2023-04-01 06:37:00,187 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 06:37:00,199 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 06:37:00,212 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 06:37:00,228 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 06:37:00,258 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 06:37:00,259 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 06:37:00,259 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 06:37:00,260 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-01 06:37:00,260 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 06:37:00,260 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 06:37:00,261 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 06:37:00,261 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 06:37:00,261 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 06:37:00,261 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2023-04-01 06:37:00,261 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2023-04-01 06:37:00,261 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2023-04-01 06:37:00,261 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-01 06:37:00,261 INFO L130 BoogieDeclarations]: Found specification of procedure read [2023-04-01 06:37:00,261 INFO L130 BoogieDeclarations]: Found specification of procedure write [2023-04-01 06:37:00,261 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2023-04-01 06:37:00,262 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2023-04-01 06:37:00,262 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2023-04-01 06:37:00,262 INFO L130 BoogieDeclarations]: Found specification of procedure init [2023-04-01 06:37:00,262 INFO L130 BoogieDeclarations]: Found specification of procedure check [2023-04-01 06:37:00,262 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 06:37:00,262 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 06:37:00,262 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 06:37:00,262 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 06:37:00,262 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 06:37:00,262 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 06:37:00,262 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 06:37:00,405 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 06:37:00,407 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 06:37:00,926 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 06:37:01,065 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 06:37:01,065 INFO L302 CfgBuilder]: Removed 0 assume(true) statements. [2023-04-01 06:37:01,067 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 06:37:01 BoogieIcfgContainer [2023-04-01 06:37:01,067 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 06:37:01,071 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 06:37:01,071 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 06:37:01,074 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 06:37:01,074 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 06:36:59" (1/3) ... [2023-04-01 06:37:01,075 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65a08245 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 06:37:01, skipping insertion in model container [2023-04-01 06:37:01,075 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:37:00" (2/3) ... [2023-04-01 06:37:01,075 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65a08245 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 06:37:01, skipping insertion in model container [2023-04-01 06:37:01,075 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 06:37:01" (3/3) ... [2023-04-01 06:37:01,076 INFO L112 eAbstractionObserver]: Analyzing ICFG pals_lcr.3.ufo.BOUNDED-6.pals.c.v+nlh-reducer.c [2023-04-01 06:37:01,093 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 06:37:01,093 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-04-01 06:37:01,163 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 06:37:01,172 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;@4c0f14a7, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 06:37:01,172 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-04-01 06:37:01,178 INFO L276 IsEmpty]: Start isEmpty. Operand has 86 states, 78 states have (on average 1.7564102564102564) internal successors, (137), 81 states have internal predecessors, (137), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 06:37:01,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-04-01 06:37:01,188 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 06:37:01,189 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] [2023-04-01 06:37:01,190 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 06:37:01,197 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 06:37:01,197 INFO L85 PathProgramCache]: Analyzing trace with hash 766535975, now seen corresponding path program 1 times [2023-04-01 06:37:01,206 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 06:37:01,206 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1964356307] [2023-04-01 06:37:01,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 06:37:01,208 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 06:37:01,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 06:37:01,802 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 06:37:01,803 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 06:37:01,803 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1964356307] [2023-04-01 06:37:01,804 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1964356307] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 06:37:01,804 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 06:37:01,804 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-01 06:37:01,806 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892455101] [2023-04-01 06:37:01,807 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 06:37:01,811 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-01 06:37:01,812 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 06:37:01,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-01 06:37:01,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-01 06:37:01,845 INFO L87 Difference]: Start difference. First operand has 86 states, 78 states have (on average 1.7564102564102564) internal successors, (137), 81 states have internal predecessors, (137), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 5 states, 5 states have (on average 8.4) internal successors, (42), 4 states have internal predecessors, (42), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:02,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 06:37:02,053 INFO L93 Difference]: Finished difference Result 150 states and 234 transitions. [2023-04-01 06:37:02,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-04-01 06:37:02,056 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.4) internal successors, (42), 4 states have internal predecessors, (42), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2023-04-01 06:37:02,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 06:37:02,063 INFO L225 Difference]: With dead ends: 150 [2023-04-01 06:37:02,064 INFO L226 Difference]: Without dead ends: 81 [2023-04-01 06:37:02,066 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-04-01 06:37:02,069 INFO L413 NwaCegarLoop]: 95 mSDtfsCounter, 344 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 344 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 06:37:02,070 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [344 Valid, 128 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 06:37:02,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2023-04-01 06:37:02,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2023-04-01 06:37:02,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 76 states have (on average 1.2105263157894737) internal successors, (92), 77 states have internal predecessors, (92), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:02,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 95 transitions. [2023-04-01 06:37:02,117 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 95 transitions. Word has length 45 [2023-04-01 06:37:02,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 06:37:02,118 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 95 transitions. [2023-04-01 06:37:02,118 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.4) internal successors, (42), 4 states have internal predecessors, (42), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:02,118 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 95 transitions. [2023-04-01 06:37:02,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-04-01 06:37:02,120 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 06:37:02,120 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] [2023-04-01 06:37:02,121 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 06:37:02,121 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 06:37:02,122 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 06:37:02,123 INFO L85 PathProgramCache]: Analyzing trace with hash 1110422474, now seen corresponding path program 1 times [2023-04-01 06:37:02,123 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 06:37:02,123 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [289761144] [2023-04-01 06:37:02,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 06:37:02,124 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 06:37:02,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 06:37:02,327 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 06:37:02,327 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 06:37:02,327 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [289761144] [2023-04-01 06:37:02,328 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [289761144] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 06:37:02,328 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 06:37:02,328 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-01 06:37:02,328 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1310248586] [2023-04-01 06:37:02,328 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 06:37:02,330 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-01 06:37:02,331 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 06:37:02,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-01 06:37:02,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-01 06:37:02,336 INFO L87 Difference]: Start difference. First operand 81 states and 95 transitions. Second operand has 5 states, 5 states have (on average 8.6) internal successors, (43), 4 states have internal predecessors, (43), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:02,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 06:37:02,452 INFO L93 Difference]: Finished difference Result 128 states and 154 transitions. [2023-04-01 06:37:02,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-04-01 06:37:02,453 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.6) internal successors, (43), 4 states have internal predecessors, (43), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2023-04-01 06:37:02,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 06:37:02,454 INFO L225 Difference]: With dead ends: 128 [2023-04-01 06:37:02,454 INFO L226 Difference]: Without dead ends: 81 [2023-04-01 06:37:02,455 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-04-01 06:37:02,456 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 216 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 216 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 06:37:02,456 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [216 Valid, 79 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 06:37:02,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2023-04-01 06:37:02,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2023-04-01 06:37:02,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 76 states have (on average 1.1842105263157894) internal successors, (90), 77 states have internal predecessors, (90), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:02,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 93 transitions. [2023-04-01 06:37:02,467 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 93 transitions. Word has length 46 [2023-04-01 06:37:02,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 06:37:02,468 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 93 transitions. [2023-04-01 06:37:02,468 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.6) internal successors, (43), 4 states have internal predecessors, (43), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:02,468 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 93 transitions. [2023-04-01 06:37:02,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-04-01 06:37:02,469 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 06:37:02,469 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] [2023-04-01 06:37:02,470 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-01 06:37:02,470 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 06:37:02,470 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 06:37:02,470 INFO L85 PathProgramCache]: Analyzing trace with hash 191451512, now seen corresponding path program 1 times [2023-04-01 06:37:02,471 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 06:37:02,471 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [449260794] [2023-04-01 06:37:02,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 06:37:02,471 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 06:37:02,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 06:37:02,624 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 06:37:02,625 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 06:37:02,625 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [449260794] [2023-04-01 06:37:02,626 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [449260794] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 06:37:02,626 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 06:37:02,626 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-01 06:37:02,626 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610327162] [2023-04-01 06:37:02,626 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 06:37:02,626 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-01 06:37:02,627 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 06:37:02,627 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-01 06:37:02,628 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-01 06:37:02,628 INFO L87 Difference]: Start difference. First operand 81 states and 93 transitions. Second operand has 5 states, 5 states have (on average 8.8) internal successors, (44), 4 states have internal predecessors, (44), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:02,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 06:37:02,751 INFO L93 Difference]: Finished difference Result 136 states and 159 transitions. [2023-04-01 06:37:02,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-04-01 06:37:02,757 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.8) internal successors, (44), 4 states have internal predecessors, (44), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2023-04-01 06:37:02,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 06:37:02,758 INFO L225 Difference]: With dead ends: 136 [2023-04-01 06:37:02,758 INFO L226 Difference]: Without dead ends: 81 [2023-04-01 06:37:02,759 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-04-01 06:37:02,760 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 233 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 233 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 06:37:02,760 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [233 Valid, 63 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 06:37:02,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2023-04-01 06:37:02,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2023-04-01 06:37:02,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 76 states have (on average 1.1578947368421053) internal successors, (88), 77 states have internal predecessors, (88), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:02,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 91 transitions. [2023-04-01 06:37:02,774 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 91 transitions. Word has length 47 [2023-04-01 06:37:02,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 06:37:02,774 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 91 transitions. [2023-04-01 06:37:02,774 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.8) internal successors, (44), 4 states have internal predecessors, (44), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:02,775 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 91 transitions. [2023-04-01 06:37:02,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-04-01 06:37:02,778 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 06:37:02,778 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] [2023-04-01 06:37:02,778 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-04-01 06:37:02,779 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 06:37:02,779 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 06:37:02,780 INFO L85 PathProgramCache]: Analyzing trace with hash 1550873900, now seen corresponding path program 1 times [2023-04-01 06:37:02,780 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 06:37:02,781 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1453538273] [2023-04-01 06:37:02,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 06:37:02,781 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 06:37:02,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 06:37:05,366 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 06:37:05,366 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 06:37:05,366 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1453538273] [2023-04-01 06:37:05,367 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1453538273] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 06:37:05,367 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 06:37:05,367 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2023-04-01 06:37:05,367 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [232618734] [2023-04-01 06:37:05,367 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 06:37:05,367 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-04-01 06:37:05,368 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 06:37:05,368 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-04-01 06:37:05,368 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2023-04-01 06:37:05,369 INFO L87 Difference]: Start difference. First operand 81 states and 91 transitions. Second operand has 21 states, 21 states have (on average 2.142857142857143) internal successors, (45), 21 states have internal predecessors, (45), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:07,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 06:37:07,383 INFO L93 Difference]: Finished difference Result 136 states and 162 transitions. [2023-04-01 06:37:07,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-04-01 06:37:07,384 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.142857142857143) internal successors, (45), 21 states have internal predecessors, (45), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 48 [2023-04-01 06:37:07,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 06:37:07,385 INFO L225 Difference]: With dead ends: 136 [2023-04-01 06:37:07,386 INFO L226 Difference]: Without dead ends: 107 [2023-04-01 06:37:07,386 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 162 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=312, Invalid=948, Unknown=0, NotChecked=0, Total=1260 [2023-04-01 06:37:07,387 INFO L413 NwaCegarLoop]: 80 mSDtfsCounter, 360 mSDsluCounter, 717 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 360 SdHoareTripleChecker+Valid, 797 SdHoareTripleChecker+Invalid, 491 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-01 06:37:07,388 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [360 Valid, 797 Invalid, 491 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 465 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-01 06:37:07,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2023-04-01 06:37:07,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 105. [2023-04-01 06:37:07,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 100 states have (on average 1.18) internal successors, (118), 101 states have internal predecessors, (118), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:07,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 121 transitions. [2023-04-01 06:37:07,408 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 121 transitions. Word has length 48 [2023-04-01 06:37:07,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 06:37:07,409 INFO L495 AbstractCegarLoop]: Abstraction has 105 states and 121 transitions. [2023-04-01 06:37:07,409 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.142857142857143) internal successors, (45), 21 states have internal predecessors, (45), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:07,410 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 121 transitions. [2023-04-01 06:37:07,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2023-04-01 06:37:07,410 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 06:37:07,410 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] [2023-04-01 06:37:07,411 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-04-01 06:37:07,411 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr1ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 06:37:07,411 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 06:37:07,411 INFO L85 PathProgramCache]: Analyzing trace with hash 664288687, now seen corresponding path program 1 times [2023-04-01 06:37:07,411 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 06:37:07,412 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1186092154] [2023-04-01 06:37:07,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 06:37:07,412 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 06:37:07,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 06:37:10,668 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 06:37:10,669 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 06:37:10,669 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1186092154] [2023-04-01 06:37:10,669 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1186092154] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 06:37:10,669 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 06:37:10,669 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2023-04-01 06:37:10,669 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [36108954] [2023-04-01 06:37:10,670 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 06:37:10,670 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-04-01 06:37:10,670 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 06:37:10,671 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-04-01 06:37:10,671 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=518, Unknown=0, NotChecked=0, Total=600 [2023-04-01 06:37:10,672 INFO L87 Difference]: Start difference. First operand 105 states and 121 transitions. Second operand has 25 states, 25 states have (on average 1.84) internal successors, (46), 24 states have internal predecessors, (46), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:14,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 06:37:14,812 INFO L93 Difference]: Finished difference Result 298 states and 371 transitions. [2023-04-01 06:37:14,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-04-01 06:37:14,813 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.84) internal successors, (46), 24 states have internal predecessors, (46), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2023-04-01 06:37:14,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 06:37:14,818 INFO L225 Difference]: With dead ends: 298 [2023-04-01 06:37:14,818 INFO L226 Difference]: Without dead ends: 242 [2023-04-01 06:37:14,822 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 406 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=607, Invalid=1745, Unknown=0, NotChecked=0, Total=2352 [2023-04-01 06:37:14,827 INFO L413 NwaCegarLoop]: 65 mSDtfsCounter, 572 mSDsluCounter, 678 mSDsCounter, 0 mSdLazyCounter, 910 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 572 SdHoareTripleChecker+Valid, 743 SdHoareTripleChecker+Invalid, 951 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 910 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-04-01 06:37:14,828 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [572 Valid, 743 Invalid, 951 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 910 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-04-01 06:37:14,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2023-04-01 06:37:14,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 144. [2023-04-01 06:37:14,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 140 states have (on average 1.2142857142857142) internal successors, (170), 140 states have internal predecessors, (170), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:14,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 173 transitions. [2023-04-01 06:37:14,882 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 173 transitions. Word has length 49 [2023-04-01 06:37:14,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 06:37:14,884 INFO L495 AbstractCegarLoop]: Abstraction has 144 states and 173 transitions. [2023-04-01 06:37:14,884 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.84) internal successors, (46), 24 states have internal predecessors, (46), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:14,884 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 173 transitions. [2023-04-01 06:37:14,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2023-04-01 06:37:14,887 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 06:37:14,888 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] [2023-04-01 06:37:14,888 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-04-01 06:37:14,888 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 06:37:14,888 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 06:37:14,889 INFO L85 PathProgramCache]: Analyzing trace with hash -2097631340, now seen corresponding path program 1 times [2023-04-01 06:37:14,889 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 06:37:14,889 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1695162301] [2023-04-01 06:37:14,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 06:37:14,889 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 06:37:14,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 06:37:15,017 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 06:37:15,017 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 06:37:15,017 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1695162301] [2023-04-01 06:37:15,017 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1695162301] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 06:37:15,017 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 06:37:15,018 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 06:37:15,018 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1293130563] [2023-04-01 06:37:15,018 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 06:37:15,019 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 06:37:15,019 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 06:37:15,019 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 06:37:15,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 06:37:15,020 INFO L87 Difference]: Start difference. First operand 144 states and 173 transitions. Second operand has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:15,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 06:37:15,075 INFO L93 Difference]: Finished difference Result 274 states and 342 transitions. [2023-04-01 06:37:15,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 06:37:15,076 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2023-04-01 06:37:15,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 06:37:15,077 INFO L225 Difference]: With dead ends: 274 [2023-04-01 06:37:15,078 INFO L226 Difference]: Without dead ends: 194 [2023-04-01 06:37:15,079 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 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 06:37:15,082 INFO L413 NwaCegarLoop]: 104 mSDtfsCounter, 36 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 06:37:15,082 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 171 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 06:37:15,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2023-04-01 06:37:15,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 180. [2023-04-01 06:37:15,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 176 states have (on average 1.2215909090909092) internal successors, (215), 176 states have internal predecessors, (215), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:15,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 218 transitions. [2023-04-01 06:37:15,133 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 218 transitions. Word has length 62 [2023-04-01 06:37:15,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 06:37:15,133 INFO L495 AbstractCegarLoop]: Abstraction has 180 states and 218 transitions. [2023-04-01 06:37:15,133 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:15,133 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 218 transitions. [2023-04-01 06:37:15,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2023-04-01 06:37:15,138 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 06:37:15,138 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] [2023-04-01 06:37:15,138 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-04-01 06:37:15,138 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 06:37:15,139 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 06:37:15,139 INFO L85 PathProgramCache]: Analyzing trace with hash -888576692, now seen corresponding path program 1 times [2023-04-01 06:37:15,139 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 06:37:15,139 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1577572926] [2023-04-01 06:37:15,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 06:37:15,139 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 06:37:15,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 06:37:15,197 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 06:37:15,197 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 06:37:15,197 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1577572926] [2023-04-01 06:37:15,198 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1577572926] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 06:37:15,198 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 06:37:15,198 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 06:37:15,198 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [344737851] [2023-04-01 06:37:15,198 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 06:37:15,198 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 06:37:15,198 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 06:37:15,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 06:37:15,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 06:37:15,199 INFO L87 Difference]: Start difference. First operand 180 states and 218 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:15,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 06:37:15,257 INFO L93 Difference]: Finished difference Result 323 states and 403 transitions. [2023-04-01 06:37:15,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 06:37:15,258 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 67 [2023-04-01 06:37:15,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 06:37:15,260 INFO L225 Difference]: With dead ends: 323 [2023-04-01 06:37:15,260 INFO L226 Difference]: Without dead ends: 207 [2023-04-01 06:37:15,261 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 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 06:37:15,263 INFO L413 NwaCegarLoop]: 76 mSDtfsCounter, 61 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 06:37:15,263 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 108 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 06:37:15,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2023-04-01 06:37:15,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 205. [2023-04-01 06:37:15,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 201 states have (on average 1.228855721393035) internal successors, (247), 201 states have internal predecessors, (247), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:15,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 250 transitions. [2023-04-01 06:37:15,328 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 250 transitions. Word has length 67 [2023-04-01 06:37:15,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 06:37:15,329 INFO L495 AbstractCegarLoop]: Abstraction has 205 states and 250 transitions. [2023-04-01 06:37:15,329 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:15,329 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 250 transitions. [2023-04-01 06:37:15,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2023-04-01 06:37:15,330 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 06:37:15,330 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] [2023-04-01 06:37:15,330 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-04-01 06:37:15,331 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 06:37:15,331 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 06:37:15,331 INFO L85 PathProgramCache]: Analyzing trace with hash 2084573819, now seen corresponding path program 1 times [2023-04-01 06:37:15,331 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 06:37:15,331 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1577170513] [2023-04-01 06:37:15,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 06:37:15,332 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 06:37:15,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 06:37:15,447 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 06:37:15,448 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 06:37:15,448 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1577170513] [2023-04-01 06:37:15,448 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1577170513] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 06:37:15,448 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 06:37:15,448 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 06:37:15,448 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950059615] [2023-04-01 06:37:15,448 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 06:37:15,450 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 06:37:15,450 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 06:37:15,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 06:37:15,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 06:37:15,452 INFO L87 Difference]: Start difference. First operand 205 states and 250 transitions. Second operand has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:15,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 06:37:15,533 INFO L93 Difference]: Finished difference Result 471 states and 595 transitions. [2023-04-01 06:37:15,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 06:37:15,534 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 68 [2023-04-01 06:37:15,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 06:37:15,535 INFO L225 Difference]: With dead ends: 471 [2023-04-01 06:37:15,535 INFO L226 Difference]: Without dead ends: 328 [2023-04-01 06:37:15,536 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 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 06:37:15,537 INFO L413 NwaCegarLoop]: 96 mSDtfsCounter, 31 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 06:37:15,538 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 163 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 06:37:15,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2023-04-01 06:37:15,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 306. [2023-04-01 06:37:15,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 306 states, 302 states have (on average 1.2417218543046358) internal successors, (375), 302 states have internal predecessors, (375), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:15,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 378 transitions. [2023-04-01 06:37:15,599 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 378 transitions. Word has length 68 [2023-04-01 06:37:15,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 06:37:15,600 INFO L495 AbstractCegarLoop]: Abstraction has 306 states and 378 transitions. [2023-04-01 06:37:15,600 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:15,600 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 378 transitions. [2023-04-01 06:37:15,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2023-04-01 06:37:15,600 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 06:37:15,600 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] [2023-04-01 06:37:15,601 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-04-01 06:37:15,601 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 06:37:15,601 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 06:37:15,601 INFO L85 PathProgramCache]: Analyzing trace with hash -18688260, now seen corresponding path program 1 times [2023-04-01 06:37:15,602 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 06:37:15,602 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [377732081] [2023-04-01 06:37:15,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 06:37:15,602 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 06:37:15,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 06:37:15,719 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 06:37:15,719 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 06:37:15,720 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [377732081] [2023-04-01 06:37:15,720 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [377732081] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 06:37:15,720 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 06:37:15,720 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 06:37:15,720 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640081443] [2023-04-01 06:37:15,720 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 06:37:15,721 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 06:37:15,721 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 06:37:15,721 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 06:37:15,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 06:37:15,722 INFO L87 Difference]: Start difference. First operand 306 states and 378 transitions. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:15,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 06:37:15,846 INFO L93 Difference]: Finished difference Result 784 states and 994 transitions. [2023-04-01 06:37:15,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 06:37:15,847 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 71 [2023-04-01 06:37:15,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 06:37:15,850 INFO L225 Difference]: With dead ends: 784 [2023-04-01 06:37:15,850 INFO L226 Difference]: Without dead ends: 542 [2023-04-01 06:37:15,851 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 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 06:37:15,852 INFO L413 NwaCegarLoop]: 89 mSDtfsCounter, 26 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 06:37:15,853 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 156 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 06:37:15,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 542 states. [2023-04-01 06:37:15,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 542 to 493. [2023-04-01 06:37:15,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 493 states, 489 states have (on average 1.2535787321063394) internal successors, (613), 489 states have internal predecessors, (613), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:15,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 493 states to 493 states and 616 transitions. [2023-04-01 06:37:15,976 INFO L78 Accepts]: Start accepts. Automaton has 493 states and 616 transitions. Word has length 71 [2023-04-01 06:37:15,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 06:37:15,976 INFO L495 AbstractCegarLoop]: Abstraction has 493 states and 616 transitions. [2023-04-01 06:37:15,976 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:15,976 INFO L276 IsEmpty]: Start isEmpty. Operand 493 states and 616 transitions. [2023-04-01 06:37:15,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2023-04-01 06:37:15,983 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 06:37:15,984 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] [2023-04-01 06:37:15,984 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-04-01 06:37:15,984 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 06:37:15,984 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 06:37:15,985 INFO L85 PathProgramCache]: Analyzing trace with hash -1742265220, now seen corresponding path program 1 times [2023-04-01 06:37:15,985 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 06:37:15,985 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [256887918] [2023-04-01 06:37:15,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 06:37:15,985 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 06:37:16,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 06:37:16,191 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 06:37:16,192 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 06:37:16,192 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [256887918] [2023-04-01 06:37:16,192 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [256887918] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 06:37:16,192 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 06:37:16,192 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-04-01 06:37:16,192 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728599233] [2023-04-01 06:37:16,192 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 06:37:16,193 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-04-01 06:37:16,193 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 06:37:16,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-04-01 06:37:16,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-04-01 06:37:16,193 INFO L87 Difference]: Start difference. First operand 493 states and 616 transitions. Second operand has 6 states, 6 states have (on average 11.833333333333334) internal successors, (71), 6 states have internal predecessors, (71), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:16,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 06:37:16,468 INFO L93 Difference]: Finished difference Result 746 states and 922 transitions. [2023-04-01 06:37:16,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-01 06:37:16,469 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 11.833333333333334) internal successors, (71), 6 states have internal predecessors, (71), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 74 [2023-04-01 06:37:16,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 06:37:16,472 INFO L225 Difference]: With dead ends: 746 [2023-04-01 06:37:16,472 INFO L226 Difference]: Without dead ends: 744 [2023-04-01 06:37:16,473 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2023-04-01 06:37:16,473 INFO L413 NwaCegarLoop]: 105 mSDtfsCounter, 108 mSDsluCounter, 317 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 422 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 06:37:16,474 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [108 Valid, 422 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 06:37:16,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 744 states. [2023-04-01 06:37:16,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 744 to 517. [2023-04-01 06:37:16,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 517 states, 513 states have (on average 1.226120857699805) internal successors, (629), 513 states have internal predecessors, (629), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:16,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 517 states to 517 states and 632 transitions. [2023-04-01 06:37:16,600 INFO L78 Accepts]: Start accepts. Automaton has 517 states and 632 transitions. Word has length 74 [2023-04-01 06:37:16,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 06:37:16,600 INFO L495 AbstractCegarLoop]: Abstraction has 517 states and 632 transitions. [2023-04-01 06:37:16,601 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 11.833333333333334) internal successors, (71), 6 states have internal predecessors, (71), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 06:37:16,601 INFO L276 IsEmpty]: Start isEmpty. Operand 517 states and 632 transitions. [2023-04-01 06:37:16,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2023-04-01 06:37:16,601 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 06:37:16,602 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 06:37:16,602 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-04-01 06:37:16,602 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 06:37:16,603 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 06:37:16,603 INFO L85 PathProgramCache]: Analyzing trace with hash -1243553711, now seen corresponding path program 1 times [2023-04-01 06:37:16,604 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 06:37:16,604 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [470837112] [2023-04-01 06:37:16,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 06:37:16,604 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 06:37:16,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 06:37:22,839 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 06:37:22,839 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 06:37:22,839 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [470837112] [2023-04-01 06:37:22,840 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [470837112] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 06:37:22,840 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2057110883] [2023-04-01 06:37:22,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 06:37:22,840 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 06:37:22,840 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 06:37:22,849 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 06:37:22,852 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 06:37:23,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 06:37:23,033 INFO L262 TraceCheckSpWp]: Trace formula consists of 713 conjuncts, 78 conjunts are in the unsatisfiable core [2023-04-01 06:37:23,042 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 06:37:43,331 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 06:37:43,331 INFO L327 TraceCheckSpWp]: Computing backward predicates...