/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain EqDomain -i ../sv-benchmarks/c/loop-new/nested-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 11:07:08,956 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 11:07:08,958 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 11:07:08,989 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 11:07:08,990 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 11:07:08,992 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 11:07:08,995 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 11:07:08,998 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 11:07:08,999 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 11:07:09,003 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 11:07:09,005 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 11:07:09,006 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 11:07:09,006 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 11:07:09,009 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 11:07:09,010 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 11:07:09,012 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 11:07:09,013 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 11:07:09,014 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 11:07:09,016 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 11:07:09,020 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 11:07:09,021 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 11:07:09,022 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 11:07:09,023 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 11:07:09,024 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 11:07:09,032 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 11:07:09,032 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 11:07:09,032 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 11:07:09,034 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 11:07:09,034 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 11:07:09,035 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 11:07:09,035 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 11:07:09,036 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 11:07:09,037 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 11:07:09,038 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 11:07:09,039 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 11:07:09,039 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 11:07:09,039 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 11:07:09,040 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 11:07:09,040 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 11:07:09,045 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 11:07:09,045 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 11:07:09,047 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 11:07:09,078 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 11:07:09,078 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 11:07:09,078 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 11:07:09,079 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 11:07:09,079 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 11:07:09,079 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 11:07:09,079 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 11:07:09,080 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 11:07:09,080 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 11:07:09,080 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 11:07:09,080 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 11:07:09,080 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 11:07:09,080 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 11:07:09,080 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 11:07:09,081 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 11:07:09,081 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 11:07:09,081 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 11:07:09,081 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 11:07:09,081 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 11:07:09,082 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 11:07:09,082 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 11:07:09,082 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 11:07:09,082 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 11:07:09,082 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 11:07:09,082 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 11:07:09,082 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 11:07:09,083 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 11:07:09,083 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 11:07:09,083 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 11:07:09,083 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 11:07:09,083 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 11:07:09,083 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 11:07:09,083 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 11:07:09,084 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 11:07:09,084 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 11:07:09,084 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 11:07:09,084 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 11:07:09,084 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 11:07:09,084 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 11:07:09,084 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 11:07:09,087 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 11:07:09,087 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> EqDomain [2023-04-01 11:07:09,302 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 11:07:09,328 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 11:07:09,330 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 11:07:09,332 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 11:07:09,333 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 11:07:09,334 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-new/nested-1.i [2023-04-01 11:07:10,566 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 11:07:10,732 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 11:07:10,733 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-new/nested-1.i [2023-04-01 11:07:10,738 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/357dba88f/7bcd6671039543e0bd86cb9ad6f69b0b/FLAGedef2b10c [2023-04-01 11:07:10,749 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/357dba88f/7bcd6671039543e0bd86cb9ad6f69b0b [2023-04-01 11:07:10,751 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 11:07:10,753 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 11:07:10,755 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 11:07:10,755 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 11:07:10,758 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 11:07:10,758 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 11:07:10" (1/1) ... [2023-04-01 11:07:10,760 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@209c1d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:07:10, skipping insertion in model container [2023-04-01 11:07:10,760 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 11:07:10" (1/1) ... [2023-04-01 11:07:10,766 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 11:07:10,784 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 11:07:10,907 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/loop-new/nested-1.i[891,904] [2023-04-01 11:07:10,916 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 11:07:10,924 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 11:07:10,949 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/loop-new/nested-1.i[891,904] [2023-04-01 11:07:10,954 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 11:07:10,964 INFO L208 MainTranslator]: Completed translation [2023-04-01 11:07:10,965 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:07:10 WrapperNode [2023-04-01 11:07:10,965 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 11:07:10,966 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 11:07:10,966 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 11:07:10,966 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 11:07:10,974 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:07:10" (1/1) ... [2023-04-01 11:07:10,974 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:07:10" (1/1) ... [2023-04-01 11:07:10,981 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:07:10" (1/1) ... [2023-04-01 11:07:10,982 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:07:10" (1/1) ... [2023-04-01 11:07:10,996 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:07:10" (1/1) ... [2023-04-01 11:07:10,999 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:07:10" (1/1) ... [2023-04-01 11:07:10,999 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:07:10" (1/1) ... [2023-04-01 11:07:11,000 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:07:10" (1/1) ... [2023-04-01 11:07:11,001 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 11:07:11,002 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 11:07:11,002 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 11:07:11,002 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 11:07:11,003 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:07:10" (1/1) ... [2023-04-01 11:07:11,010 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 11:07:11,019 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:07:11,034 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 11:07:11,042 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 11:07:11,071 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 11:07:11,071 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 11:07:11,071 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 11:07:11,072 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-01 11:07:11,072 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-01 11:07:11,073 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 11:07:11,073 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 11:07:11,073 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 11:07:11,073 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-04-01 11:07:11,073 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-04-01 11:07:11,073 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 11:07:11,073 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 11:07:11,073 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-01 11:07:11,073 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 11:07:11,074 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 11:07:11,074 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 11:07:11,074 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 11:07:11,074 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 11:07:11,074 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 11:07:11,074 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 11:07:11,074 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 11:07:11,074 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 11:07:11,154 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 11:07:11,156 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 11:07:11,320 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 11:07:11,339 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 11:07:11,339 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-04-01 11:07:11,341 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 11:07:11 BoogieIcfgContainer [2023-04-01 11:07:11,342 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 11:07:11,343 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 11:07:11,344 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 11:07:11,346 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 11:07:11,346 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 11:07:10" (1/3) ... [2023-04-01 11:07:11,347 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6b55ae90 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 11:07:11, skipping insertion in model container [2023-04-01 11:07:11,347 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:07:10" (2/3) ... [2023-04-01 11:07:11,347 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6b55ae90 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 11:07:11, skipping insertion in model container [2023-04-01 11:07:11,347 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 11:07:11" (3/3) ... [2023-04-01 11:07:11,348 INFO L112 eAbstractionObserver]: Analyzing ICFG nested-1.i [2023-04-01 11:07:11,362 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 11:07:11,362 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 11:07:11,398 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 11:07:11,403 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;@3c91c3da, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 11:07:11,403 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 11:07:11,407 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 11:07:11,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-04-01 11:07:11,425 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:07:11,426 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:07:11,426 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:07:11,430 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:07:11,431 INFO L85 PathProgramCache]: Analyzing trace with hash 1255205020, now seen corresponding path program 1 times [2023-04-01 11:07:11,438 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:07:11,439 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2134862136] [2023-04-01 11:07:11,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:07:11,439 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:07:11,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:07:11,683 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 11:07:11,683 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:07:11,684 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2134862136] [2023-04-01 11:07:11,684 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2134862136] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 11:07:11,684 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 11:07:11,688 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-01 11:07:11,690 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [412022668] [2023-04-01 11:07:11,690 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 11:07:11,694 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-01 11:07:11,694 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:07:11,718 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-01 11:07:11,722 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-01 11:07:11,724 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:07:11,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:07:11,773 INFO L93 Difference]: Finished difference Result 37 states and 44 transitions. [2023-04-01 11:07:11,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-01 11:07:11,775 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2023-04-01 11:07:11,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:07:11,801 INFO L225 Difference]: With dead ends: 37 [2023-04-01 11:07:11,801 INFO L226 Difference]: Without dead ends: 16 [2023-04-01 11:07:11,803 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-01 11:07:11,806 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 10 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 11:07:11,806 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 50 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 11:07:11,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-04-01 11:07:11,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2023-04-01 11:07:11,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:07:11,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2023-04-01 11:07:11,835 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 12 [2023-04-01 11:07:11,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:07:11,836 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2023-04-01 11:07:11,836 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:07:11,836 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2023-04-01 11:07:11,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-04-01 11:07:11,837 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:07:11,837 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:07:11,837 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 11:07:11,837 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:07:11,838 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:07:11,838 INFO L85 PathProgramCache]: Analyzing trace with hash -1779234738, now seen corresponding path program 1 times [2023-04-01 11:07:11,838 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:07:11,838 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [627931028] [2023-04-01 11:07:11,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:07:11,839 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:07:11,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:07:11,904 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:07:11,904 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:07:11,905 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [627931028] [2023-04-01 11:07:11,905 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [627931028] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 11:07:11,905 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 11:07:11,905 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-01 11:07:11,905 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006548738] [2023-04-01 11:07:11,905 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 11:07:11,906 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-01 11:07:11,907 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:07:11,907 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-01 11:07:11,907 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-01 11:07:11,908 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:07:11,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:07:11,923 INFO L93 Difference]: Finished difference Result 23 states and 26 transitions. [2023-04-01 11:07:11,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-01 11:07:11,924 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2023-04-01 11:07:11,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:07:11,925 INFO L225 Difference]: With dead ends: 23 [2023-04-01 11:07:11,925 INFO L226 Difference]: Without dead ends: 16 [2023-04-01 11:07:11,925 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-01 11:07:11,926 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 4 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 11:07:11,927 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 27 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 11:07:11,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-04-01 11:07:11,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2023-04-01 11:07:11,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:07:11,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2023-04-01 11:07:11,932 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 14 [2023-04-01 11:07:11,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:07:11,932 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2023-04-01 11:07:11,932 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:07:11,932 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2023-04-01 11:07:11,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-04-01 11:07:11,933 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:07:11,933 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:07:11,933 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-01 11:07:11,933 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:07:11,934 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:07:11,934 INFO L85 PathProgramCache]: Analyzing trace with hash -2086399086, now seen corresponding path program 1 times [2023-04-01 11:07:11,934 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:07:11,934 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [398270703] [2023-04-01 11:07:11,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:07:11,935 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:07:11,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:07:12,057 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:07:12,057 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:07:12,058 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [398270703] [2023-04-01 11:07:12,058 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [398270703] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:07:12,058 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1669525801] [2023-04-01 11:07:12,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:07:12,058 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:07:12,059 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:07:12,062 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 11:07:12,064 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 11:07:12,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:07:12,143 INFO L262 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-01 11:07:12,147 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:07:12,199 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:07:12,199 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:07:12,230 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:07:12,230 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1669525801] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:07:12,230 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1273959048] [2023-04-01 11:07:12,267 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-01 11:07:12,268 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:07:12,272 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:07:12,277 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:07:12,278 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:07:12,405 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 37 for LOIs [2023-04-01 11:07:12,970 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 41 for LOIs [2023-04-01 11:07:12,992 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:07:12,997 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:07:13,661 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '265#(and (= 2 (select |#length| 1)) (= 9 (select |#length| 2)) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (= |#NULL.base| 0))' at error location [2023-04-01 11:07:13,661 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:07:13,662 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:07:13,662 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2023-04-01 11:07:13,662 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656385220] [2023-04-01 11:07:13,663 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:07:13,664 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-04-01 11:07:13,665 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:07:13,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-04-01 11:07:13,668 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=309, Unknown=0, NotChecked=0, Total=380 [2023-04-01 11:07:13,668 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 10 states, 10 states have (on average 1.8) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:07:13,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:07:13,728 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2023-04-01 11:07:13,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-01 11:07:13,728 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2023-04-01 11:07:13,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:07:13,729 INFO L225 Difference]: With dead ends: 27 [2023-04-01 11:07:13,730 INFO L226 Difference]: Without dead ends: 19 [2023-04-01 11:07:13,730 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=89, Invalid=373, Unknown=0, NotChecked=0, Total=462 [2023-04-01 11:07:13,732 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 11:07:13,732 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 51 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 11:07:13,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-04-01 11:07:13,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-04-01 11:07:13,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:07:13,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2023-04-01 11:07:13,737 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 15 [2023-04-01 11:07:13,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:07:13,738 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2023-04-01 11:07:13,738 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:07:13,738 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2023-04-01 11:07:13,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-04-01 11:07:13,739 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:07:13,739 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:07:13,752 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-01 11:07:13,952 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:07:13,952 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:07:13,953 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:07:13,953 INFO L85 PathProgramCache]: Analyzing trace with hash -8537778, now seen corresponding path program 2 times [2023-04-01 11:07:13,953 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:07:13,953 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [282176253] [2023-04-01 11:07:13,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:07:13,954 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:07:13,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:07:14,105 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:07:14,109 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:07:14,109 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [282176253] [2023-04-01 11:07:14,109 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [282176253] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:07:14,111 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [955465191] [2023-04-01 11:07:14,111 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 11:07:14,112 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:07:14,112 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:07:14,113 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 11:07:14,115 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-01 11:07:14,159 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-01 11:07:14,159 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 11:07:14,160 INFO L262 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-01 11:07:14,161 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:07:14,205 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 11:07:14,205 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:07:14,258 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 11:07:14,259 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [955465191] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:07:14,259 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [853323301] [2023-04-01 11:07:14,260 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-01 11:07:14,260 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:07:14,261 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:07:14,261 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:07:14,261 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:07:14,314 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 37 for LOIs [2023-04-01 11:07:14,596 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 41 for LOIs [2023-04-01 11:07:14,609 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:07:14,613 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:07:15,145 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '475#(and (= 2 (select |#length| 1)) (= 9 (select |#length| 2)) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (= |#NULL.base| 0))' at error location [2023-04-01 11:07:15,145 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:07:15,145 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:07:15,145 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5, 5] total 14 [2023-04-01 11:07:15,146 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482483275] [2023-04-01 11:07:15,146 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:07:15,146 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-04-01 11:07:15,146 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:07:15,147 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-04-01 11:07:15,147 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=471, Unknown=0, NotChecked=0, Total=552 [2023-04-01 11:07:15,147 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:07:15,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:07:15,555 INFO L93 Difference]: Finished difference Result 52 states and 64 transitions. [2023-04-01 11:07:15,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-04-01 11:07:15,556 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2023-04-01 11:07:15,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:07:15,557 INFO L225 Difference]: With dead ends: 52 [2023-04-01 11:07:15,557 INFO L226 Difference]: Without dead ends: 41 [2023-04-01 11:07:15,558 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 653 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=536, Invalid=1816, Unknown=0, NotChecked=0, Total=2352 [2023-04-01 11:07:15,559 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 95 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 11:07:15,559 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [95 Valid, 63 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 11:07:15,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-04-01 11:07:15,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2023-04-01 11:07:15,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 36 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:07:15,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2023-04-01 11:07:15,572 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 18 [2023-04-01 11:07:15,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:07:15,572 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2023-04-01 11:07:15,573 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:07:15,573 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2023-04-01 11:07:15,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-04-01 11:07:15,575 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:07:15,575 INFO L195 NwaCegarLoop]: trace histogram [20, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:07:15,581 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-01 11:07:15,780 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2023-04-01 11:07:15,780 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:07:15,781 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:07:15,781 INFO L85 PathProgramCache]: Analyzing trace with hash -773376228, now seen corresponding path program 3 times [2023-04-01 11:07:15,781 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:07:15,781 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [525674214] [2023-04-01 11:07:15,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:07:15,781 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:07:15,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:07:15,930 INFO L134 CoverageAnalysis]: Checked inductivity of 286 backedges. 112 proven. 15 refuted. 0 times theorem prover too weak. 159 trivial. 0 not checked. [2023-04-01 11:07:15,931 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:07:15,931 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [525674214] [2023-04-01 11:07:15,931 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [525674214] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:07:15,931 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [748263558] [2023-04-01 11:07:15,931 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 11:07:15,931 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:07:15,931 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:07:15,932 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 11:07:15,957 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-01 11:07:16,005 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 11:07:16,006 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 11:07:16,007 INFO L262 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-01 11:07:16,010 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:07:16,091 INFO L134 CoverageAnalysis]: Checked inductivity of 286 backedges. 112 proven. 15 refuted. 0 times theorem prover too weak. 159 trivial. 0 not checked. [2023-04-01 11:07:16,092 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:07:16,172 INFO L134 CoverageAnalysis]: Checked inductivity of 286 backedges. 112 proven. 15 refuted. 0 times theorem prover too weak. 159 trivial. 0 not checked. [2023-04-01 11:07:16,172 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [748263558] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:07:16,172 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [805779823] [2023-04-01 11:07:16,174 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-01 11:07:16,174 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:07:16,174 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:07:16,174 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:07:16,175 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:07:16,198 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 37 for LOIs [2023-04-01 11:07:16,430 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 41 for LOIs [2023-04-01 11:07:16,440 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:07:16,445 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:07:16,987 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '963#(and (= 2 (select |#length| 1)) (= 9 (select |#length| 2)) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (= |#NULL.base| 0))' at error location [2023-04-01 11:07:16,987 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:07:16,987 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:07:16,987 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 20 [2023-04-01 11:07:16,987 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579750441] [2023-04-01 11:07:16,988 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:07:16,988 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-04-01 11:07:16,988 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:07:16,989 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-04-01 11:07:16,989 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=676, Unknown=0, NotChecked=0, Total=870 [2023-04-01 11:07:16,989 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand has 20 states, 20 states have (on average 1.6) internal successors, (32), 20 states have internal predecessors, (32), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:07:17,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:07:17,078 INFO L93 Difference]: Finished difference Result 88 states and 115 transitions. [2023-04-01 11:07:17,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-04-01 11:07:17,078 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.6) internal successors, (32), 20 states have internal predecessors, (32), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2023-04-01 11:07:17,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:07:17,079 INFO L225 Difference]: With dead ends: 88 [2023-04-01 11:07:17,079 INFO L226 Difference]: Without dead ends: 61 [2023-04-01 11:07:17,080 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 98 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 495 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=254, Invalid=868, Unknown=0, NotChecked=0, Total=1122 [2023-04-01 11:07:17,081 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 8 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 11:07:17,082 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 51 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 11:07:17,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2023-04-01 11:07:17,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2023-04-01 11:07:17,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0892857142857142) internal successors, (61), 56 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:07:17,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 65 transitions. [2023-04-01 11:07:17,098 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 65 transitions. Word has length 40 [2023-04-01 11:07:17,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:07:17,099 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 65 transitions. [2023-04-01 11:07:17,099 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.6) internal successors, (32), 20 states have internal predecessors, (32), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:07:17,099 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 65 transitions. [2023-04-01 11:07:17,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2023-04-01 11:07:17,100 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:07:17,100 INFO L195 NwaCegarLoop]: trace histogram [40, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:07:17,112 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-04-01 11:07:17,306 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:07:17,306 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:07:17,306 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:07:17,306 INFO L85 PathProgramCache]: Analyzing trace with hash -85708956, now seen corresponding path program 4 times [2023-04-01 11:07:17,307 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:07:17,307 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [363528836] [2023-04-01 11:07:17,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:07:17,307 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:07:17,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:07:17,497 INFO L134 CoverageAnalysis]: Checked inductivity of 956 backedges. 0 proven. 736 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2023-04-01 11:07:17,498 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:07:17,498 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [363528836] [2023-04-01 11:07:17,498 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [363528836] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:07:17,498 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1882797924] [2023-04-01 11:07:17,498 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 11:07:17,498 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:07:17,498 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:07:17,499 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 11:07:17,502 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-01 11:07:17,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:07:17,576 INFO L262 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 7 conjunts are in the unsatisfiable core [2023-04-01 11:07:17,578 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:07:17,776 INFO L134 CoverageAnalysis]: Checked inductivity of 956 backedges. 0 proven. 736 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2023-04-01 11:07:17,776 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:07:17,893 INFO L134 CoverageAnalysis]: Checked inductivity of 956 backedges. 0 proven. 736 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2023-04-01 11:07:17,893 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1882797924] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:07:17,893 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2130279680] [2023-04-01 11:07:17,896 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-01 11:07:17,896 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:07:17,896 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:07:17,897 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:07:17,897 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:07:17,922 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 37 for LOIs [2023-04-01 11:07:18,151 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 41 for LOIs [2023-04-01 11:07:18,168 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:07:18,171 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:07:18,627 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1640#(and (= 2 (select |#length| 1)) (= 9 (select |#length| 2)) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (= |#NULL.base| 0))' at error location [2023-04-01 11:07:18,627 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:07:18,627 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:07:18,627 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 19 [2023-04-01 11:07:18,628 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983255003] [2023-04-01 11:07:18,628 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:07:18,629 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-04-01 11:07:18,629 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:07:18,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-04-01 11:07:18,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=631, Unknown=0, NotChecked=0, Total=812 [2023-04-01 11:07:18,630 INFO L87 Difference]: Start difference. First operand 61 states and 65 transitions. Second operand has 19 states, 19 states have (on average 2.5789473684210527) internal successors, (49), 19 states have internal predecessors, (49), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:07:18,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:07:18,773 INFO L93 Difference]: Finished difference Result 138 states and 153 transitions. [2023-04-01 11:07:18,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-04-01 11:07:18,773 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.5789473684210527) internal successors, (49), 19 states have internal predecessors, (49), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 60 [2023-04-01 11:07:18,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:07:18,774 INFO L225 Difference]: With dead ends: 138 [2023-04-01 11:07:18,775 INFO L226 Difference]: Without dead ends: 133 [2023-04-01 11:07:18,776 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 447 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=256, Invalid=866, Unknown=0, NotChecked=0, Total=1122 [2023-04-01 11:07:18,776 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 26 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 11:07:18,777 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 45 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 11:07:18,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2023-04-01 11:07:18,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2023-04-01 11:07:18,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.0859375) internal successors, (139), 128 states have internal predecessors, (139), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:07:18,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 143 transitions. [2023-04-01 11:07:18,797 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 143 transitions. Word has length 60 [2023-04-01 11:07:18,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:07:18,798 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 143 transitions. [2023-04-01 11:07:18,798 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.5789473684210527) internal successors, (49), 19 states have internal predecessors, (49), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:07:18,798 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 143 transitions. [2023-04-01 11:07:18,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2023-04-01 11:07:18,801 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:07:18,801 INFO L195 NwaCegarLoop]: trace histogram [100, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:07:18,808 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-01 11:07:19,001 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:07:19,002 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:07:19,002 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:07:19,002 INFO L85 PathProgramCache]: Analyzing trace with hash 1930440592, now seen corresponding path program 5 times [2023-04-01 11:07:19,002 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:07:19,002 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1699593571] [2023-04-01 11:07:19,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:07:19,003 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:07:19,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:07:24,965 INFO L134 CoverageAnalysis]: Checked inductivity of 6050 backedges. 5922 proven. 119 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-01 11:07:24,965 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:07:24,965 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1699593571] [2023-04-01 11:07:24,965 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1699593571] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:07:24,965 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1760539453] [2023-04-01 11:07:24,965 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 11:07:24,966 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:07:24,966 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:07:24,967 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 11:07:24,969 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-01 11:07:25,157 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 60 check-sat command(s) [2023-04-01 11:07:25,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 11:07:25,161 INFO L262 TraceCheckSpWp]: Trace formula consists of 612 conjuncts, 107 conjunts are in the unsatisfiable core [2023-04-01 11:07:25,167 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:07:25,459 INFO L134 CoverageAnalysis]: Checked inductivity of 6050 backedges. 6041 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-01 11:07:25,459 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-01 11:07:25,459 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1760539453] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 11:07:25,460 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-01 11:07:25,460 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [105] imperfect sequences [105] total 108 [2023-04-01 11:07:25,460 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564468042] [2023-04-01 11:07:25,460 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 11:07:25,460 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 105 states [2023-04-01 11:07:25,461 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:07:25,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2023-04-01 11:07:25,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5266, Invalid=6290, Unknown=0, NotChecked=0, Total=11556 [2023-04-01 11:07:25,468 INFO L87 Difference]: Start difference. First operand 133 states and 143 transitions. Second operand has 105 states, 105 states have (on average 1.2190476190476192) internal successors, (128), 104 states have internal predecessors, (128), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:07:27,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:07:27,010 INFO L93 Difference]: Finished difference Result 5128 states and 5588 transitions. [2023-04-01 11:07:27,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2023-04-01 11:07:27,011 INFO L78 Accepts]: Start accepts. Automaton has has 105 states, 105 states have (on average 1.2190476190476192) internal successors, (128), 104 states have internal predecessors, (128), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 132 [2023-04-01 11:07:27,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:07:27,012 INFO L225 Difference]: With dead ends: 5128 [2023-04-01 11:07:27,012 INFO L226 Difference]: Without dead ends: 0 [2023-04-01 11:07:27,024 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 696 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=5272, Invalid=6500, Unknown=0, NotChecked=0, Total=11772 [2023-04-01 11:07:27,025 INFO L413 NwaCegarLoop]: 99 mSDtfsCounter, 164 mSDsluCounter, 555 mSDsCounter, 0 mSdLazyCounter, 1316 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 164 SdHoareTripleChecker+Valid, 654 SdHoareTripleChecker+Invalid, 1316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-04-01 11:07:27,025 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [164 Valid, 654 Invalid, 1316 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1316 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-04-01 11:07:27,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2023-04-01 11:07:27,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2023-04-01 11:07:27,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-04-01 11:07:27,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2023-04-01 11:07:27,026 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 132 [2023-04-01 11:07:27,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:07:27,026 INFO L495 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2023-04-01 11:07:27,026 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 105 states, 105 states have (on average 1.2190476190476192) internal successors, (128), 104 states have internal predecessors, (128), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:07:27,026 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2023-04-01 11:07:27,026 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2023-04-01 11:07:27,028 INFO L805 garLoopResultBuilder]: Registering result SAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-04-01 11:07:27,039 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-04-01 11:07:27,235 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:07:27,237 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions.