/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/list-ext3-properties/sll_length_check-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 11:00:34,939 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 11:00:34,941 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 11:00:34,978 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 11:00:34,978 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 11:00:34,981 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 11:00:34,984 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 11:00:34,986 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 11:00:34,988 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 11:00:34,998 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 11:00:34,999 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 11:00:35,001 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 11:00:35,001 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 11:00:35,004 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 11:00:35,005 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 11:00:35,006 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 11:00:35,007 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 11:00:35,007 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 11:00:35,010 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 11:00:35,013 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 11:00:35,014 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 11:00:35,015 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 11:00:35,016 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 11:00:35,016 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 11:00:35,019 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 11:00:35,019 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 11:00:35,019 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 11:00:35,020 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 11:00:35,020 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 11:00:35,021 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 11:00:35,021 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 11:00:35,021 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 11:00:35,022 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 11:00:35,022 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 11:00:35,023 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 11:00:35,023 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 11:00:35,024 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 11:00:35,024 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 11:00:35,024 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 11:00:35,029 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 11:00:35,030 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 11:00:35,031 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 11:00:35,061 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 11:00:35,061 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 11:00:35,061 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 11:00:35,061 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 11:00:35,062 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 11:00:35,062 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 11:00:35,062 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 11:00:35,062 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 11:00:35,062 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 11:00:35,062 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 11:00:35,063 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 11:00:35,063 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 11:00:35,063 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 11:00:35,063 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 11:00:35,063 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 11:00:35,063 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 11:00:35,063 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 11:00:35,063 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 11:00:35,064 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 11:00:35,064 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 11:00:35,064 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 11:00:35,064 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 11:00:35,064 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 11:00:35,064 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 11:00:35,064 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 11:00:35,065 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 11:00:35,065 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 11:00:35,065 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 11:00:35,065 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 11:00:35,065 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 11:00:35,065 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 11:00:35,065 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 11:00:35,065 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 11:00:35,065 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 11:00:35,066 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 11:00:35,066 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 11:00:35,066 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 11:00:35,066 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 11:00:35,066 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 11:00:35,066 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 11:00:35,066 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 11:00:35,066 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> EqDomain [2023-04-01 11:00:35,325 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 11:00:35,350 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 11:00:35,353 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 11:00:35,354 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 11:00:35,355 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 11:00:35,356 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/list-ext3-properties/sll_length_check-2.i [2023-04-01 11:00:36,526 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 11:00:36,732 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 11:00:36,733 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-ext3-properties/sll_length_check-2.i [2023-04-01 11:00:36,744 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e498ba4c6/4ea5efb31cc544f3a39d573a9e139fef/FLAG371f8ede2 [2023-04-01 11:00:36,765 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e498ba4c6/4ea5efb31cc544f3a39d573a9e139fef [2023-04-01 11:00:36,769 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 11:00:36,771 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 11:00:36,771 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 11:00:36,772 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 11:00:36,774 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 11:00:36,775 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 11:00:36" (1/1) ... [2023-04-01 11:00:36,777 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@f11b1c5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:00:36, skipping insertion in model container [2023-04-01 11:00:36,777 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 11:00:36" (1/1) ... [2023-04-01 11:00:36,785 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 11:00:36,826 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 11:00:37,048 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/list-ext3-properties/sll_length_check-2.i[23814,23827] [2023-04-01 11:00:37,051 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 11:00:37,065 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 11:00:37,109 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/list-ext3-properties/sll_length_check-2.i[23814,23827] [2023-04-01 11:00:37,110 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 11:00:37,137 INFO L208 MainTranslator]: Completed translation [2023-04-01 11:00:37,137 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:00:37 WrapperNode [2023-04-01 11:00:37,137 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 11:00:37,138 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 11:00:37,138 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 11:00:37,139 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 11:00:37,146 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:00:37" (1/1) ... [2023-04-01 11:00:37,146 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:00:37" (1/1) ... [2023-04-01 11:00:37,155 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:00:37" (1/1) ... [2023-04-01 11:00:37,155 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:00:37" (1/1) ... [2023-04-01 11:00:37,166 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:00:37" (1/1) ... [2023-04-01 11:00:37,170 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:00:37" (1/1) ... [2023-04-01 11:00:37,172 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:00:37" (1/1) ... [2023-04-01 11:00:37,174 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:00:37" (1/1) ... [2023-04-01 11:00:37,178 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 11:00:37,179 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 11:00:37,179 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 11:00:37,179 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 11:00:37,180 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:00:37" (1/1) ... [2023-04-01 11:00:37,185 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 11:00:37,196 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:00:37,214 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 11:00:37,217 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 11:00:37,246 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 11:00:37,246 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 11:00:37,246 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 11:00:37,246 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2023-04-01 11:00:37,246 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2023-04-01 11:00:37,246 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2023-04-01 11:00:37,246 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_create [2023-04-01 11:00:37,247 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_length [2023-04-01 11:00:37,247 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_destroy [2023-04-01 11:00:37,247 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 11:00:37,247 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 11:00:37,247 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 11:00:37,247 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-04-01 11:00:37,247 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-04-01 11:00:37,247 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 11:00:37,248 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 11:00:37,248 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 11:00:37,248 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2023-04-01 11:00:37,248 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2023-04-01 11:00:37,248 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2023-04-01 11:00:37,248 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2023-04-01 11:00:37,248 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2023-04-01 11:00:37,248 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2023-04-01 11:00:37,248 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2023-04-01 11:00:37,249 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2023-04-01 11:00:37,249 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2023-04-01 11:00:37,249 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2023-04-01 11:00:37,249 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2023-04-01 11:00:37,249 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2023-04-01 11:00:37,249 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2023-04-01 11:00:37,249 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2023-04-01 11:00:37,249 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2023-04-01 11:00:37,249 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2023-04-01 11:00:37,250 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2023-04-01 11:00:37,250 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2023-04-01 11:00:37,250 INFO L130 BoogieDeclarations]: Found specification of procedure select [2023-04-01 11:00:37,250 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2023-04-01 11:00:37,250 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2023-04-01 11:00:37,250 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2023-04-01 11:00:37,250 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2023-04-01 11:00:37,250 INFO L130 BoogieDeclarations]: Found specification of procedure random [2023-04-01 11:00:37,250 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2023-04-01 11:00:37,250 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2023-04-01 11:00:37,251 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2023-04-01 11:00:37,251 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2023-04-01 11:00:37,251 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2023-04-01 11:00:37,251 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2023-04-01 11:00:37,251 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2023-04-01 11:00:37,251 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2023-04-01 11:00:37,251 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2023-04-01 11:00:37,251 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2023-04-01 11:00:37,251 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2023-04-01 11:00:37,252 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2023-04-01 11:00:37,252 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2023-04-01 11:00:37,252 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2023-04-01 11:00:37,252 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2023-04-01 11:00:37,252 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2023-04-01 11:00:37,252 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2023-04-01 11:00:37,252 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2023-04-01 11:00:37,252 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2023-04-01 11:00:37,253 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2023-04-01 11:00:37,253 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2023-04-01 11:00:37,253 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2023-04-01 11:00:37,253 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2023-04-01 11:00:37,253 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2023-04-01 11:00:37,253 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2023-04-01 11:00:37,253 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2023-04-01 11:00:37,253 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2023-04-01 11:00:37,253 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2023-04-01 11:00:37,254 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2023-04-01 11:00:37,254 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2023-04-01 11:00:37,254 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2023-04-01 11:00:37,254 INFO L130 BoogieDeclarations]: Found specification of procedure free [2023-04-01 11:00:37,254 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2023-04-01 11:00:37,254 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2023-04-01 11:00:37,254 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2023-04-01 11:00:37,254 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2023-04-01 11:00:37,254 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2023-04-01 11:00:37,254 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2023-04-01 11:00:37,255 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2023-04-01 11:00:37,255 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2023-04-01 11:00:37,255 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2023-04-01 11:00:37,255 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2023-04-01 11:00:37,255 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2023-04-01 11:00:37,255 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2023-04-01 11:00:37,255 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2023-04-01 11:00:37,255 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2023-04-01 11:00:37,255 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2023-04-01 11:00:37,255 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2023-04-01 11:00:37,256 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2023-04-01 11:00:37,256 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2023-04-01 11:00:37,256 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2023-04-01 11:00:37,256 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2023-04-01 11:00:37,256 INFO L130 BoogieDeclarations]: Found specification of procedure system [2023-04-01 11:00:37,256 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2023-04-01 11:00:37,256 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2023-04-01 11:00:37,256 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2023-04-01 11:00:37,256 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2023-04-01 11:00:37,256 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2023-04-01 11:00:37,256 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2023-04-01 11:00:37,257 INFO L130 BoogieDeclarations]: Found specification of procedure div [2023-04-01 11:00:37,257 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2023-04-01 11:00:37,257 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2023-04-01 11:00:37,257 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2023-04-01 11:00:37,257 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2023-04-01 11:00:37,257 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2023-04-01 11:00:37,257 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2023-04-01 11:00:37,257 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2023-04-01 11:00:37,257 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2023-04-01 11:00:37,257 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2023-04-01 11:00:37,258 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2023-04-01 11:00:37,258 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2023-04-01 11:00:37,258 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2023-04-01 11:00:37,258 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2023-04-01 11:00:37,258 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2023-04-01 11:00:37,258 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2023-04-01 11:00:37,258 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2023-04-01 11:00:37,258 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2023-04-01 11:00:37,258 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2023-04-01 11:00:37,258 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2023-04-01 11:00:37,259 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2023-04-01 11:00:37,259 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2023-04-01 11:00:37,259 INFO L130 BoogieDeclarations]: Found specification of procedure sll_create [2023-04-01 11:00:37,259 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-04-01 11:00:37,259 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-04-01 11:00:37,259 INFO L130 BoogieDeclarations]: Found specification of procedure sll_length [2023-04-01 11:00:37,259 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-04-01 11:00:37,259 INFO L130 BoogieDeclarations]: Found specification of procedure sll_destroy [2023-04-01 11:00:37,259 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 11:00:37,260 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 11:00:37,260 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 11:00:37,260 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 11:00:37,260 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 11:00:37,260 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 11:00:37,260 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 11:00:37,513 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 11:00:37,515 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 11:00:37,546 INFO L771 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2023-04-01 11:00:37,652 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 11:00:37,679 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 11:00:37,680 INFO L302 CfgBuilder]: Removed 4 assume(true) statements. [2023-04-01 11:00:37,682 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 11:00:37 BoogieIcfgContainer [2023-04-01 11:00:37,682 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 11:00:37,684 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 11:00:37,684 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 11:00:37,687 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 11:00:37,687 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 11:00:36" (1/3) ... [2023-04-01 11:00:37,688 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37bdcf6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 11:00:37, skipping insertion in model container [2023-04-01 11:00:37,688 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:00:37" (2/3) ... [2023-04-01 11:00:37,688 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37bdcf6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 11:00:37, skipping insertion in model container [2023-04-01 11:00:37,689 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 11:00:37" (3/3) ... [2023-04-01 11:00:37,690 INFO L112 eAbstractionObserver]: Analyzing ICFG sll_length_check-2.i [2023-04-01 11:00:37,705 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 11:00:37,705 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 11:00:37,753 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 11:00:37,757 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;@3c84fbef, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 11:00:37,758 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 11:00:37,760 INFO L276 IsEmpty]: Start isEmpty. Operand has 34 states, 21 states have (on average 1.380952380952381) internal successors, (29), 22 states have internal predecessors, (29), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-01 11:00:37,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-04-01 11:00:37,765 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:00:37,766 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:00:37,767 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:00:37,774 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:00:37,774 INFO L85 PathProgramCache]: Analyzing trace with hash -1632925328, now seen corresponding path program 1 times [2023-04-01 11:00:37,782 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:00:37,783 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1738232346] [2023-04-01 11:00:37,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:00:37,784 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:00:37,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:00:37,962 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 11:00:37,962 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:00:37,963 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1738232346] [2023-04-01 11:00:37,963 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1738232346] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 11:00:37,963 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 11:00:37,963 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-04-01 11:00:37,965 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590449577] [2023-04-01 11:00:37,966 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 11:00:37,969 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-04-01 11:00:37,970 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:00:38,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-04-01 11:00:38,022 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-04-01 11:00:38,024 INFO L87 Difference]: Start difference. First operand has 34 states, 21 states have (on average 1.380952380952381) internal successors, (29), 22 states have internal predecessors, (29), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-04-01 11:00:38,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:00:38,066 INFO L93 Difference]: Finished difference Result 61 states and 71 transitions. [2023-04-01 11:00:38,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-04-01 11:00:38,071 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 18 [2023-04-01 11:00:38,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:00:38,076 INFO L225 Difference]: With dead ends: 61 [2023-04-01 11:00:38,076 INFO L226 Difference]: Without dead ends: 22 [2023-04-01 11:00:38,079 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-04-01 11:00:38,083 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 11:00:38,084 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 33 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 11:00:38,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-04-01 11:00:38,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-04-01 11:00:38,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 11:00:38,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2023-04-01 11:00:38,117 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 18 [2023-04-01 11:00:38,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:00:38,118 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2023-04-01 11:00:38,118 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-04-01 11:00:38,120 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2023-04-01 11:00:38,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-04-01 11:00:38,120 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:00:38,121 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:00:38,121 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 11:00:38,121 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:00:38,122 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:00:38,122 INFO L85 PathProgramCache]: Analyzing trace with hash -1775111619, now seen corresponding path program 1 times [2023-04-01 11:00:38,122 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:00:38,122 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1015645215] [2023-04-01 11:00:38,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:00:38,123 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:00:38,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:00:38,342 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 11:00:38,342 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:00:38,342 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1015645215] [2023-04-01 11:00:38,343 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1015645215] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 11:00:38,343 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 11:00:38,343 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-01 11:00:38,343 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1971162342] [2023-04-01 11:00:38,343 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 11:00:38,344 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-01 11:00:38,344 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:00:38,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-01 11:00:38,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-01 11:00:38,345 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 states have internal predecessors, (12), 3 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 11:00:38,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:00:38,412 INFO L93 Difference]: Finished difference Result 44 states and 50 transitions. [2023-04-01 11:00:38,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-04-01 11:00:38,413 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 states have internal predecessors, (12), 3 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 19 [2023-04-01 11:00:38,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:00:38,416 INFO L225 Difference]: With dead ends: 44 [2023-04-01 11:00:38,416 INFO L226 Difference]: Without dead ends: 35 [2023-04-01 11:00:38,420 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-04-01 11:00:38,421 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 7 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 11:00:38,422 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 57 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 11:00:38,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-04-01 11:00:38,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 27. [2023-04-01 11:00:38,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 19 states have internal predecessors, (22), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2023-04-01 11:00:38,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 32 transitions. [2023-04-01 11:00:38,436 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 32 transitions. Word has length 19 [2023-04-01 11:00:38,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:00:38,437 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 32 transitions. [2023-04-01 11:00:38,437 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 states have internal predecessors, (12), 3 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 11:00:38,437 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 32 transitions. [2023-04-01 11:00:38,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-04-01 11:00:38,438 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:00:38,438 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:00:38,439 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-01 11:00:38,439 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:00:38,439 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:00:38,439 INFO L85 PathProgramCache]: Analyzing trace with hash 782522926, now seen corresponding path program 1 times [2023-04-01 11:00:38,440 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:00:38,440 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1762383915] [2023-04-01 11:00:38,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:00:38,440 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:00:38,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:00:38,533 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:00:38,534 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:00:38,534 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1762383915] [2023-04-01 11:00:38,534 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1762383915] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:00:38,534 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1425795703] [2023-04-01 11:00:38,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:00:38,534 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:00:38,534 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:00:38,537 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 11:00:38,557 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 11:00:38,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:00:38,683 INFO L262 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 5 conjunts are in the unsatisfiable core [2023-04-01 11:00:38,690 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:00:38,768 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:00:38,769 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-01 11:00:38,769 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1425795703] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 11:00:38,771 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-01 11:00:38,771 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2023-04-01 11:00:38,771 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984571601] [2023-04-01 11:00:38,771 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 11:00:38,773 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-04-01 11:00:38,773 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:00:38,774 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-04-01 11:00:38,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-04-01 11:00:38,774 INFO L87 Difference]: Start difference. First operand 27 states and 32 transitions. Second operand has 6 states, 5 states have (on average 2.8) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 11:00:38,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:00:38,844 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2023-04-01 11:00:38,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-01 11:00:38,844 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.8) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 21 [2023-04-01 11:00:38,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:00:38,845 INFO L225 Difference]: With dead ends: 44 [2023-04-01 11:00:38,845 INFO L226 Difference]: Without dead ends: 34 [2023-04-01 11:00:38,846 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-04-01 11:00:38,847 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 12 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 11:00:38,847 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 88 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 11:00:38,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-04-01 11:00:38,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 23. [2023-04-01 11:00:38,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 11:00:38,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2023-04-01 11:00:38,853 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 21 [2023-04-01 11:00:38,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:00:38,853 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2023-04-01 11:00:38,853 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.8) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 11:00:38,853 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2023-04-01 11:00:38,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-04-01 11:00:38,854 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:00:38,854 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:00:38,863 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-04-01 11:00:39,060 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 11:00:39,061 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:00:39,061 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:00:39,061 INFO L85 PathProgramCache]: Analyzing trace with hash -738239099, now seen corresponding path program 1 times [2023-04-01 11:00:39,062 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:00:39,062 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1702127773] [2023-04-01 11:00:39,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:00:39,062 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:00:39,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:00:39,206 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:00:39,206 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:00:39,206 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1702127773] [2023-04-01 11:00:39,206 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1702127773] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:00:39,207 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1090359851] [2023-04-01 11:00:39,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:00:39,207 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:00:39,207 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:00:39,208 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 11:00:39,211 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 11:00:39,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:00:39,353 INFO L262 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 5 conjunts are in the unsatisfiable core [2023-04-01 11:00:39,356 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:00:39,402 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:00:39,402 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:00:39,514 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:00:39,515 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1090359851] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:00:39,516 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [490701228] [2023-04-01 11:00:39,562 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-01 11:00:39,562 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:00:39,568 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:00:39,573 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:00:39,573 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:00:39,718 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 49 for LOIs [2023-04-01 11:00:40,137 INFO L197 IcfgInterpreter]: Interpreting procedure sll_length with input of size 46 for LOIs [2023-04-01 11:00:40,151 INFO L197 IcfgInterpreter]: Interpreting procedure sll_create with input of size 51 for LOIs [2023-04-01 11:00:40,523 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:00:40,526 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:00:41,700 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [490701228] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 11:00:41,700 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:00:41,700 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [6, 6, 6] total 26 [2023-04-01 11:00:41,701 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1439842684] [2023-04-01 11:00:41,701 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 11:00:41,701 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-04-01 11:00:41,701 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:00:41,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-04-01 11:00:41,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=564, Unknown=0, NotChecked=0, Total=650 [2023-04-01 11:00:41,703 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 16 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 9 states have internal predecessors, (15), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 11:00:43,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:00:43,100 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2023-04-01 11:00:43,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-04-01 11:00:43,101 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 9 states have internal predecessors, (15), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 22 [2023-04-01 11:00:43,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:00:43,102 INFO L225 Difference]: With dead ends: 51 [2023-04-01 11:00:43,102 INFO L226 Difference]: Without dead ends: 46 [2023-04-01 11:00:43,104 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 505 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=197, Invalid=1443, Unknown=0, NotChecked=0, Total=1640 [2023-04-01 11:00:43,106 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 72 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 233 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 11:00:43,107 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [73 Valid, 5 Invalid, 233 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 215 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 11:00:43,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-04-01 11:00:43,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 38. [2023-04-01 11:00:43,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-01 11:00:43,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2023-04-01 11:00:43,128 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 22 [2023-04-01 11:00:43,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:00:43,128 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2023-04-01 11:00:43,129 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 9 states have internal predecessors, (15), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 11:00:43,129 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2023-04-01 11:00:43,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-04-01 11:00:43,130 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:00:43,131 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:00:43,144 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 11:00:43,337 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 11:00:43,338 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:00:43,338 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:00:43,338 INFO L85 PathProgramCache]: Analyzing trace with hash 322243604, now seen corresponding path program 1 times [2023-04-01 11:00:43,338 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:00:43,338 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [814083977] [2023-04-01 11:00:43,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:00:43,338 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:00:43,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:00:43,456 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 11:00:43,456 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:00:43,456 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [814083977] [2023-04-01 11:00:43,456 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [814083977] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:00:43,456 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [128972705] [2023-04-01 11:00:43,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:00:43,457 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:00:43,457 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:00:43,458 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 11:00:43,461 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 11:00:43,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:00:43,564 INFO L262 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 5 conjunts are in the unsatisfiable core [2023-04-01 11:00:43,566 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:00:43,604 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 11:00:43,604 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:00:43,694 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 11:00:43,694 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [128972705] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:00:43,694 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1399118824] [2023-04-01 11:00:43,696 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-01 11:00:43,696 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:00:43,697 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:00:43,697 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:00:43,697 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:00:43,730 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 49 for LOIs [2023-04-01 11:00:43,995 INFO L197 IcfgInterpreter]: Interpreting procedure sll_length with input of size 46 for LOIs [2023-04-01 11:00:44,023 INFO L197 IcfgInterpreter]: Interpreting procedure sll_create with input of size 51 for LOIs [2023-04-01 11:00:44,281 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:00:44,285 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:00:45,336 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '916#(and (= (select |old(#valid)| 1) 1) (= (select |old(#length)| 1) 2) (= (select |old(#valid)| 0) 0) (not (= |#StackHeapBarrier| 0)) (= (select (select |old(#memory_int)| 1) 0) 48) (not (= |#StackHeapBarrier| main_~s~0.base)) (= |#NULL.offset| 0) (= 21 (select |old(#length)| 2)) (not (= main_~s~0.base 0)) (= (select (select |old(#memory_int)| 1) 1) 0) (= (select |old(#valid)| 2) 1) (= main_~len~1 2) (= main_~s~0.offset 0) (= |#NULL.base| 0))' at error location [2023-04-01 11:00:45,336 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:00:45,336 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:00:45,337 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-04-01 11:00:45,337 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742093052] [2023-04-01 11:00:45,337 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:00:45,337 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-04-01 11:00:45,337 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:00:45,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-04-01 11:00:45,338 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=660, Unknown=2, NotChecked=0, Total=756 [2023-04-01 11:00:45,339 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand has 12 states, 10 states have (on average 3.2) internal successors, (32), 12 states have internal predecessors, (32), 4 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (5), 2 states have call predecessors, (5), 4 states have call successors, (5) [2023-04-01 11:00:45,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:00:45,421 INFO L93 Difference]: Finished difference Result 69 states and 76 transitions. [2023-04-01 11:00:45,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-01 11:00:45,422 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 3.2) internal successors, (32), 12 states have internal predecessors, (32), 4 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (5), 2 states have call predecessors, (5), 4 states have call successors, (5) Word has length 23 [2023-04-01 11:00:45,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:00:45,424 INFO L225 Difference]: With dead ends: 69 [2023-04-01 11:00:45,424 INFO L226 Difference]: Without dead ends: 52 [2023-04-01 11:00:45,425 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 316 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=110, Invalid=758, Unknown=2, NotChecked=0, Total=870 [2023-04-01 11:00:45,425 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 19 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 11:00:45,426 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 46 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 11:00:45,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2023-04-01 11:00:45,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 44. [2023-04-01 11:00:45,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 32 states have (on average 1.1875) internal successors, (38), 33 states have internal predecessors, (38), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-01 11:00:45,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 49 transitions. [2023-04-01 11:00:45,436 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 49 transitions. Word has length 23 [2023-04-01 11:00:45,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:00:45,436 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 49 transitions. [2023-04-01 11:00:45,437 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 3.2) internal successors, (32), 12 states have internal predecessors, (32), 4 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (5), 2 states have call predecessors, (5), 4 states have call successors, (5) [2023-04-01 11:00:45,437 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 49 transitions. [2023-04-01 11:00:45,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-04-01 11:00:45,437 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:00:45,437 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:00:45,443 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-01 11:00:45,641 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 11:00:45,641 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:00:45,641 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:00:45,641 INFO L85 PathProgramCache]: Analyzing trace with hash -1974758564, now seen corresponding path program 2 times [2023-04-01 11:00:45,642 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:00:45,642 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [558030960] [2023-04-01 11:00:45,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:00:45,642 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:00:45,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:00:45,884 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:00:45,884 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:00:45,884 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [558030960] [2023-04-01 11:00:45,884 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [558030960] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:00:45,884 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [939667452] [2023-04-01 11:00:45,884 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 11:00:45,884 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:00:45,885 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:00:45,886 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 11:00:45,888 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 11:00:45,993 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-01 11:00:45,994 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 11:00:45,995 INFO L262 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 37 conjunts are in the unsatisfiable core [2023-04-01 11:00:45,997 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:00:46,047 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 11:00:46,210 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:00:46,210 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:00:46,347 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:00:46,348 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [939667452] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:00:46,348 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1756239213] [2023-04-01 11:00:46,349 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-01 11:00:46,349 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:00:46,350 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:00:46,350 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:00:46,350 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:00:46,378 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 49 for LOIs [2023-04-01 11:00:46,608 INFO L197 IcfgInterpreter]: Interpreting procedure sll_length with input of size 46 for LOIs [2023-04-01 11:00:46,634 INFO L197 IcfgInterpreter]: Interpreting procedure sll_create with input of size 51 for LOIs [2023-04-01 11:00:46,803 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:00:46,806 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:00:48,037 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1281#(and (= (select |old(#valid)| 1) 1) (= (select |old(#length)| 1) 2) (= (select |old(#valid)| 0) 0) (not (= |#StackHeapBarrier| 0)) (= (select (select |old(#memory_int)| 1) 0) 48) (not (= |#StackHeapBarrier| main_~s~0.base)) (= |#NULL.offset| 0) (= 21 (select |old(#length)| 2)) (not (= main_~s~0.base 0)) (= (select (select |old(#memory_int)| 1) 1) 0) (= (select |old(#valid)| 2) 1) (= main_~len~1 2) (= main_~s~0.offset 0) (= |#NULL.base| 0))' at error location [2023-04-01 11:00:48,038 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:00:48,038 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:00:48,038 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 13, 11] total 22 [2023-04-01 11:00:48,038 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377505415] [2023-04-01 11:00:48,038 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:00:48,038 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-04-01 11:00:48,039 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:00:48,039 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-04-01 11:00:48,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1291, Unknown=2, NotChecked=0, Total=1406 [2023-04-01 11:00:48,040 INFO L87 Difference]: Start difference. First operand 44 states and 49 transitions. Second operand has 22 states, 16 states have (on average 1.875) internal successors, (30), 19 states have internal predecessors, (30), 3 states have call successors, (5), 2 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2023-04-01 11:00:50,081 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 11:00:50,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:00:50,247 INFO L93 Difference]: Finished difference Result 58 states and 65 transitions. [2023-04-01 11:00:50,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-04-01 11:00:50,247 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 16 states have (on average 1.875) internal successors, (30), 19 states have internal predecessors, (30), 3 states have call successors, (5), 2 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 26 [2023-04-01 11:00:50,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:00:50,248 INFO L225 Difference]: With dead ends: 58 [2023-04-01 11:00:50,248 INFO L226 Difference]: Without dead ends: 52 [2023-04-01 11:00:50,249 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 389 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=157, Invalid=1647, Unknown=2, NotChecked=0, Total=1806 [2023-04-01 11:00:50,249 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 21 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 195 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 178 SdHoareTripleChecker+Invalid, 198 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 195 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2023-04-01 11:00:50,250 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 178 Invalid, 198 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 195 Invalid, 1 Unknown, 0 Unchecked, 2.1s Time] [2023-04-01 11:00:50,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2023-04-01 11:00:50,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 47. [2023-04-01 11:00:50,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 35 states have (on average 1.2) internal successors, (42), 36 states have internal predecessors, (42), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-01 11:00:50,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 53 transitions. [2023-04-01 11:00:50,260 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 53 transitions. Word has length 26 [2023-04-01 11:00:50,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:00:50,261 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 53 transitions. [2023-04-01 11:00:50,261 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 16 states have (on average 1.875) internal successors, (30), 19 states have internal predecessors, (30), 3 states have call successors, (5), 2 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2023-04-01 11:00:50,261 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 53 transitions. [2023-04-01 11:00:50,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-04-01 11:00:50,261 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:00:50,262 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:00:50,267 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 11:00:50,467 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 11:00:50,468 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:00:50,468 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:00:50,468 INFO L85 PathProgramCache]: Analyzing trace with hash 644845853, now seen corresponding path program 3 times [2023-04-01 11:00:50,468 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:00:50,468 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [478506479] [2023-04-01 11:00:50,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:00:50,468 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:00:50,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:00:50,635 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-04-01 11:00:50,635 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:00:50,635 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [478506479] [2023-04-01 11:00:50,635 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [478506479] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:00:50,636 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [501091528] [2023-04-01 11:00:50,636 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 11:00:50,636 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:00:50,636 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:00:50,637 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 11:00:50,647 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 11:00:50,744 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 11:00:50,745 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 11:00:50,746 INFO L262 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 13 conjunts are in the unsatisfiable core [2023-04-01 11:00:50,747 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:00:50,784 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-04-01 11:00:50,785 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:00:50,850 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-04-01 11:00:50,850 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [501091528] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:00:50,850 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [942571954] [2023-04-01 11:00:50,853 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-01 11:00:50,853 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:00:50,853 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:00:50,853 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:00:50,853 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:00:50,877 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 49 for LOIs [2023-04-01 11:00:51,116 INFO L197 IcfgInterpreter]: Interpreting procedure sll_length with input of size 46 for LOIs [2023-04-01 11:00:51,136 INFO L197 IcfgInterpreter]: Interpreting procedure sll_create with input of size 51 for LOIs [2023-04-01 11:00:51,304 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:00:51,307 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:00:52,257 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1635#(and (= (select |old(#valid)| 1) 1) (= (select |old(#length)| 1) 2) (= (select |old(#valid)| 0) 0) (not (= |#StackHeapBarrier| 0)) (= (select (select |old(#memory_int)| 1) 0) 48) (not (= |#StackHeapBarrier| main_~s~0.base)) (= |#NULL.offset| 0) (= 21 (select |old(#length)| 2)) (not (= main_~s~0.base 0)) (= (select (select |old(#memory_int)| 1) 1) 0) (= (select |old(#valid)| 2) 1) (= main_~len~1 2) (= main_~s~0.offset 0) (= |#NULL.base| 0))' at error location [2023-04-01 11:00:52,258 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:00:52,258 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:00:52,258 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 9 [2023-04-01 11:00:52,258 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [987595823] [2023-04-01 11:00:52,258 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:00:52,258 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-04-01 11:00:52,258 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:00:52,259 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-04-01 11:00:52,259 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=531, Unknown=2, NotChecked=0, Total=600 [2023-04-01 11:00:52,260 INFO L87 Difference]: Start difference. First operand 47 states and 53 transitions. Second operand has 9 states, 8 states have (on average 2.375) internal successors, (19), 9 states have internal predecessors, (19), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2023-04-01 11:00:52,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:00:52,341 INFO L93 Difference]: Finished difference Result 60 states and 66 transitions. [2023-04-01 11:00:52,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-01 11:00:52,345 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.375) internal successors, (19), 9 states have internal predecessors, (19), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 27 [2023-04-01 11:00:52,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:00:52,346 INFO L225 Difference]: With dead ends: 60 [2023-04-01 11:00:52,346 INFO L226 Difference]: Without dead ends: 55 [2023-04-01 11:00:52,346 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 59 SyntacticMatches, 6 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 111 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=71, Invalid=577, Unknown=2, NotChecked=0, Total=650 [2023-04-01 11:00:52,347 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 5 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 11:00:52,347 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 117 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 11:00:52,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2023-04-01 11:00:52,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 48. [2023-04-01 11:00:52,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 36 states have (on average 1.1944444444444444) internal successors, (43), 37 states have internal predecessors, (43), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-01 11:00:52,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 54 transitions. [2023-04-01 11:00:52,357 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 54 transitions. Word has length 27 [2023-04-01 11:00:52,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:00:52,357 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 54 transitions. [2023-04-01 11:00:52,357 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.375) internal successors, (19), 9 states have internal predecessors, (19), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2023-04-01 11:00:52,358 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 54 transitions. [2023-04-01 11:00:52,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-04-01 11:00:52,358 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:00:52,358 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:00:52,366 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 11:00:52,565 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 11:00:52,566 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:00:52,566 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:00:52,566 INFO L85 PathProgramCache]: Analyzing trace with hash 1096662126, now seen corresponding path program 1 times [2023-04-01 11:00:52,566 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:00:52,566 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2056919837] [2023-04-01 11:00:52,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:00:52,566 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:00:52,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:00:52,639 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 11:00:52,640 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:00:52,640 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2056919837] [2023-04-01 11:00:52,640 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2056919837] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 11:00:52,640 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 11:00:52,640 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2023-04-01 11:00:52,640 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1869231307] [2023-04-01 11:00:52,640 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 11:00:52,641 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-04-01 11:00:52,641 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:00:52,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-04-01 11:00:52,641 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2023-04-01 11:00:52,642 INFO L87 Difference]: Start difference. First operand 48 states and 54 transitions. Second operand has 9 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 8 states have internal predecessors, (19), 2 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2023-04-01 11:00:52,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:00:52,707 INFO L93 Difference]: Finished difference Result 53 states and 58 transitions. [2023-04-01 11:00:52,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-01 11:00:52,707 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 8 states have internal predecessors, (19), 2 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 27 [2023-04-01 11:00:52,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:00:52,708 INFO L225 Difference]: With dead ends: 53 [2023-04-01 11:00:52,708 INFO L226 Difference]: Without dead ends: 48 [2023-04-01 11:00:52,708 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2023-04-01 11:00:52,709 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 9 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 11:00:52,709 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 117 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 11:00:52,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2023-04-01 11:00:52,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2023-04-01 11:00:52,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 36 states have (on average 1.1666666666666667) internal successors, (42), 37 states have internal predecessors, (42), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-01 11:00:52,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2023-04-01 11:00:52,719 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 27 [2023-04-01 11:00:52,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:00:52,719 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2023-04-01 11:00:52,719 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 8 states have internal predecessors, (19), 2 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2023-04-01 11:00:52,719 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2023-04-01 11:00:52,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-04-01 11:00:52,720 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:00:52,720 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:00:52,720 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-04-01 11:00:52,721 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:00:52,721 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:00:52,721 INFO L85 PathProgramCache]: Analyzing trace with hash 248204156, now seen corresponding path program 4 times [2023-04-01 11:00:52,721 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:00:52,721 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1636469845] [2023-04-01 11:00:52,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:00:52,721 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:00:52,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:00:53,240 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:00:53,241 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:00:53,241 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1636469845] [2023-04-01 11:00:53,241 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1636469845] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:00:53,241 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1149480120] [2023-04-01 11:00:53,241 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 11:00:53,241 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:00:53,241 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:00:53,243 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 11:00:53,245 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-01 11:00:53,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:00:53,356 INFO L262 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 66 conjunts are in the unsatisfiable core [2023-04-01 11:00:53,360 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:00:53,367 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-04-01 11:00:53,399 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 11:00:53,403 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 11:00:53,437 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-04-01 11:00:53,438 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-04-01 11:00:53,485 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2023-04-01 11:00:53,489 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2023-04-01 11:00:53,857 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:00:53,857 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:01:10,786 WARN L223 SmtUtils]: Spent 6.35s on a formula simplification that was a NOOP. DAG size: 27 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-04-01 11:01:10,970 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:01:10,971 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1149480120] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:01:10,971 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [964111710] [2023-04-01 11:01:10,972 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-01 11:01:10,973 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:01:10,973 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:01:10,973 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:01:10,973 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:01:10,997 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 49 for LOIs [2023-04-01 11:01:11,183 INFO L197 IcfgInterpreter]: Interpreting procedure sll_length with input of size 46 for LOIs [2023-04-01 11:01:11,202 INFO L197 IcfgInterpreter]: Interpreting procedure sll_create with input of size 51 for LOIs [2023-04-01 11:01:11,369 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:01:11,371 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:01:12,902 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2190#(and (= (select |old(#valid)| 1) 1) (= (select |old(#length)| 1) 2) (= (select |old(#valid)| 0) 0) (not (= |#StackHeapBarrier| 0)) (= (select (select |old(#memory_int)| 1) 0) 48) (not (= |#StackHeapBarrier| main_~s~0.base)) (= |#NULL.offset| 0) (= 21 (select |old(#length)| 2)) (not (= main_~s~0.base 0)) (= (select (select |old(#memory_int)| 1) 1) 0) (= (select |old(#valid)| 2) 1) (= main_~len~1 2) (= main_~s~0.offset 0) (= |#NULL.base| 0))' at error location [2023-04-01 11:01:12,902 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:01:12,902 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:01:12,902 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 14] total 32 [2023-04-01 11:01:12,902 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24189673] [2023-04-01 11:01:12,902 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:01:12,902 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-04-01 11:01:12,903 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:01:12,903 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-04-01 11:01:12,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=2105, Unknown=5, NotChecked=0, Total=2256 [2023-04-01 11:01:12,904 INFO L87 Difference]: Start difference. First operand 48 states and 53 transitions. Second operand has 32 states, 28 states have (on average 1.5714285714285714) internal successors, (44), 29 states have internal predecessors, (44), 3 states have call successors, (5), 2 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2023-04-01 11:01:13,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:01:13,320 INFO L93 Difference]: Finished difference Result 87 states and 96 transitions. [2023-04-01 11:01:13,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-04-01 11:01:13,325 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 28 states have (on average 1.5714285714285714) internal successors, (44), 29 states have internal predecessors, (44), 3 states have call successors, (5), 2 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 28 [2023-04-01 11:01:13,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:01:13,326 INFO L225 Difference]: With dead ends: 87 [2023-04-01 11:01:13,326 INFO L226 Difference]: Without dead ends: 72 [2023-04-01 11:01:13,327 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 619 ImplicationChecksByTransitivity, 18.8s TimeCoverageRelationStatistics Valid=161, Invalid=2284, Unknown=5, NotChecked=0, Total=2450 [2023-04-01 11:01:13,327 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 23 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 393 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 397 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 393 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-01 11:01:13,328 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 262 Invalid, 397 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 393 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-01 11:01:13,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2023-04-01 11:01:13,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 62. [2023-04-01 11:01:13,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 47 states have (on average 1.148936170212766) internal successors, (54), 49 states have internal predecessors, (54), 7 states have call successors, (7), 7 states have call predecessors, (7), 7 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2023-04-01 11:01:13,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 68 transitions. [2023-04-01 11:01:13,347 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 68 transitions. Word has length 28 [2023-04-01 11:01:13,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:01:13,347 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 68 transitions. [2023-04-01 11:01:13,347 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 28 states have (on average 1.5714285714285714) internal successors, (44), 29 states have internal predecessors, (44), 3 states have call successors, (5), 2 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2023-04-01 11:01:13,347 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 68 transitions. [2023-04-01 11:01:13,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-04-01 11:01:13,352 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:01:13,352 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:01:13,362 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-04-01 11:01:13,559 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:01:13,559 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:01:13,560 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:01:13,560 INFO L85 PathProgramCache]: Analyzing trace with hash 1240954894, now seen corresponding path program 1 times [2023-04-01 11:01:13,560 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:01:13,560 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1745766187] [2023-04-01 11:01:13,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:01:13,560 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:01:13,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:01:13,635 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 11:01:13,635 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:01:13,635 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1745766187] [2023-04-01 11:01:13,635 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1745766187] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:01:13,635 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1659420784] [2023-04-01 11:01:13,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:01:13,636 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:01:13,636 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:01:13,637 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 11:01:13,639 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-01 11:01:13,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:01:13,756 INFO L262 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 7 conjunts are in the unsatisfiable core [2023-04-01 11:01:13,760 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:01:13,788 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 11:01:13,788 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:01:13,904 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 11:01:13,905 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1659420784] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:01:13,905 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1115986759] [2023-04-01 11:01:13,906 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-01 11:01:13,906 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:01:13,906 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:01:13,907 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:01:13,907 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:01:13,929 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 49 for LOIs [2023-04-01 11:01:14,250 INFO L197 IcfgInterpreter]: Interpreting procedure sll_length with input of size 39 for LOIs [2023-04-01 11:01:14,271 INFO L197 IcfgInterpreter]: Interpreting procedure sll_create with input of size 49 for LOIs [2023-04-01 11:01:14,430 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:01:14,433 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:01:15,353 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2622#(and (= (select |old(#valid)| 1) 1) (= (select |old(#length)| 1) 2) (= (select |old(#valid)| 0) 0) (not (= |#StackHeapBarrier| 0)) (= (select (select |old(#memory_int)| 1) 0) 48) (= |#NULL.offset| 0) (= 21 (select |old(#length)| 2)) (= (select (select |old(#memory_int)| 1) 1) 0) (= (select |old(#valid)| 2) 1) (= |#NULL.base| 0))' at error location [2023-04-01 11:01:15,354 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:01:15,354 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:01:15,354 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 12 [2023-04-01 11:01:15,354 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [245675588] [2023-04-01 11:01:15,354 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:01:15,355 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-04-01 11:01:15,355 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:01:15,355 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-04-01 11:01:15,356 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=462, Unknown=2, NotChecked=0, Total=552 [2023-04-01 11:01:15,356 INFO L87 Difference]: Start difference. First operand 62 states and 68 transitions. Second operand has 12 states, 11 states have (on average 3.1818181818181817) internal successors, (35), 12 states have internal predecessors, (35), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2023-04-01 11:01:15,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:01:15,460 INFO L93 Difference]: Finished difference Result 72 states and 76 transitions. [2023-04-01 11:01:15,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-01 11:01:15,461 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 3.1818181818181817) internal successors, (35), 12 states have internal predecessors, (35), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 29 [2023-04-01 11:01:15,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:01:15,462 INFO L225 Difference]: With dead ends: 72 [2023-04-01 11:01:15,462 INFO L226 Difference]: Without dead ends: 60 [2023-04-01 11:01:15,462 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 61 SyntacticMatches, 11 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 258 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=115, Invalid=585, Unknown=2, NotChecked=0, Total=702 [2023-04-01 11:01:15,463 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 32 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 11:01:15,463 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 139 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 11:01:15,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2023-04-01 11:01:15,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2023-04-01 11:01:15,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 42 states have (on average 1.1428571428571428) internal successors, (48), 43 states have internal predecessors, (48), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-01 11:01:15,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 59 transitions. [2023-04-01 11:01:15,475 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 59 transitions. Word has length 29 [2023-04-01 11:01:15,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:01:15,476 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 59 transitions. [2023-04-01 11:01:15,476 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 3.1818181818181817) internal successors, (35), 12 states have internal predecessors, (35), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2023-04-01 11:01:15,476 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 59 transitions. [2023-04-01 11:01:15,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-04-01 11:01:15,477 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:01:15,477 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:01:15,484 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-04-01 11:01:15,681 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:01:15,681 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:01:15,681 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:01:15,681 INFO L85 PathProgramCache]: Analyzing trace with hash 1854804276, now seen corresponding path program 5 times [2023-04-01 11:01:15,682 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:01:15,682 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1617446341] [2023-04-01 11:01:15,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:01:15,682 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:01:15,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:01:15,766 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 11:01:15,766 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:01:15,766 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1617446341] [2023-04-01 11:01:15,767 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1617446341] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:01:15,767 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [763388051] [2023-04-01 11:01:15,767 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 11:01:15,767 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:01:15,767 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:01:15,769 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 11:01:15,795 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-04-01 11:01:15,905 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-01 11:01:15,905 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 11:01:15,906 INFO L262 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-01 11:01:15,908 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:01:15,967 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 11:01:15,967 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:01:16,070 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 11:01:16,070 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [763388051] provided 1 perfect and 1 imperfect interpolant sequences [2023-04-01 11:01:16,070 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-04-01 11:01:16,070 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [7, 7] total 15 [2023-04-01 11:01:16,070 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1812929075] [2023-04-01 11:01:16,071 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 11:01:16,071 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-01 11:01:16,071 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:01:16,071 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-01 11:01:16,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2023-04-01 11:01:16,072 INFO L87 Difference]: Start difference. First operand 54 states and 59 transitions. Second operand has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 3 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 11:01:16,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:01:16,125 INFO L93 Difference]: Finished difference Result 58 states and 62 transitions. [2023-04-01 11:01:16,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-01 11:01:16,125 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 3 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 31 [2023-04-01 11:01:16,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:01:16,126 INFO L225 Difference]: With dead ends: 58 [2023-04-01 11:01:16,126 INFO L226 Difference]: Without dead ends: 33 [2023-04-01 11:01:16,126 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 53 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2023-04-01 11:01:16,127 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 0 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 11:01:16,127 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 81 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 11:01:16,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-04-01 11:01:16,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2023-04-01 11:01:16,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 25 states have (on average 1.12) internal successors, (28), 25 states have internal predecessors, (28), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 11:01:16,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2023-04-01 11:01:16,132 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 31 [2023-04-01 11:01:16,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:01:16,132 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2023-04-01 11:01:16,133 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 3 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 11:01:16,133 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2023-04-01 11:01:16,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-04-01 11:01:16,133 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:01:16,133 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:01:16,142 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-04-01 11:01:16,334 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-04-01 11:01:16,334 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:01:16,334 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:01:16,334 INFO L85 PathProgramCache]: Analyzing trace with hash 1492458452, now seen corresponding path program 2 times [2023-04-01 11:01:16,334 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:01:16,334 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [947303127] [2023-04-01 11:01:16,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:01:16,335 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:01:16,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:01:16,714 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 11:01:16,715 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:01:16,715 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [947303127] [2023-04-01 11:01:16,715 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [947303127] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:01:16,715 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1709307333] [2023-04-01 11:01:16,715 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 11:01:16,715 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:01:16,715 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:01:16,717 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 11:01:16,742 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-04-01 11:01:16,850 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-01 11:01:16,850 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 11:01:16,852 INFO L262 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 60 conjunts are in the unsatisfiable core [2023-04-01 11:01:16,854 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:01:16,863 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-04-01 11:01:16,894 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 11:01:16,937 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-04-01 11:01:16,938 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-04-01 11:01:16,981 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 11:01:16,988 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 19 [2023-04-01 11:01:17,379 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 11:01:17,379 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:01:19,868 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 11:01:19,868 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1709307333] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:01:19,868 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1254001295] [2023-04-01 11:01:19,870 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-01 11:01:19,870 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:01:19,870 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:01:19,870 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:01:19,870 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:01:19,894 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 49 for LOIs [2023-04-01 11:01:20,196 INFO L197 IcfgInterpreter]: Interpreting procedure sll_length with input of size 39 for LOIs [2023-04-01 11:01:20,218 INFO L197 IcfgInterpreter]: Interpreting procedure sll_create with input of size 49 for LOIs [2023-04-01 11:01:20,365 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:01:20,368 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:01:21,760 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3393#(and (= (select |old(#valid)| 1) 1) (= (select |old(#length)| 1) 2) (= (select |old(#valid)| 0) 0) (not (= |#StackHeapBarrier| 0)) (= (select (select |old(#memory_int)| 1) 0) 48) (= |#NULL.offset| 0) (= 21 (select |old(#length)| 2)) (= (select (select |old(#memory_int)| 1) 1) 0) (= (select |old(#valid)| 2) 1) (= |#NULL.base| 0))' at error location [2023-04-01 11:01:21,761 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:01:21,761 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:01:21,761 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 15] total 33 [2023-04-01 11:01:21,761 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266629354] [2023-04-01 11:01:21,761 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:01:21,762 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2023-04-01 11:01:21,762 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:01:21,762 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2023-04-01 11:01:21,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=1824, Unknown=3, NotChecked=0, Total=1980 [2023-04-01 11:01:21,763 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand has 33 states, 27 states have (on average 1.7037037037037037) internal successors, (46), 30 states have internal predecessors, (46), 3 states have call successors, (5), 2 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2023-04-01 11:01:22,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:01:22,341 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2023-04-01 11:01:22,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-04-01 11:01:22,342 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 27 states have (on average 1.7037037037037037) internal successors, (46), 30 states have internal predecessors, (46), 3 states have call successors, (5), 2 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 32 [2023-04-01 11:01:22,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:01:22,342 INFO L225 Difference]: With dead ends: 41 [2023-04-01 11:01:22,342 INFO L226 Difference]: Without dead ends: 36 [2023-04-01 11:01:22,343 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 59 SyntacticMatches, 8 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 759 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=263, Invalid=2490, Unknown=3, NotChecked=0, Total=2756 [2023-04-01 11:01:22,344 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 30 mSDsluCounter, 242 mSDsCounter, 0 mSdLazyCounter, 383 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 389 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 383 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-01 11:01:22,344 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 258 Invalid, 389 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 383 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-01 11:01:22,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-04-01 11:01:22,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2023-04-01 11:01:22,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 states have internal predecessors, (29), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 11:01:22,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2023-04-01 11:01:22,350 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 32 [2023-04-01 11:01:22,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:01:22,350 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2023-04-01 11:01:22,350 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 27 states have (on average 1.7037037037037037) internal successors, (46), 30 states have internal predecessors, (46), 3 states have call successors, (5), 2 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2023-04-01 11:01:22,350 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2023-04-01 11:01:22,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-04-01 11:01:22,351 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:01:22,351 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:01:22,362 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-04-01 11:01:22,559 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:01:22,559 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:01:22,560 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:01:22,560 INFO L85 PathProgramCache]: Analyzing trace with hash 754390949, now seen corresponding path program 3 times [2023-04-01 11:01:22,560 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:01:22,560 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1820377067] [2023-04-01 11:01:22,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:01:22,560 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:01:22,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:01:22,724 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 11:01:22,724 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:01:22,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1820377067] [2023-04-01 11:01:22,725 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1820377067] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:01:22,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [4747153] [2023-04-01 11:01:22,725 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 11:01:22,725 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:01:22,725 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:01:22,729 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 11:01:22,748 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-04-01 11:01:22,857 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 11:01:22,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 11:01:22,859 INFO L262 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 17 conjunts are in the unsatisfiable core [2023-04-01 11:01:22,862 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:01:22,936 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 11:01:22,936 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:01:23,041 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 11:01:23,041 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [4747153] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:01:23,041 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1595960291] [2023-04-01 11:01:23,042 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-01 11:01:23,042 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:01:23,043 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:01:23,043 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:01:23,043 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:01:23,071 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 49 for LOIs [2023-04-01 11:01:23,444 INFO L197 IcfgInterpreter]: Interpreting procedure sll_length with input of size 39 for LOIs [2023-04-01 11:01:23,466 INFO L197 IcfgInterpreter]: Interpreting procedure sll_create with input of size 49 for LOIs [2023-04-01 11:01:23,639 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:01:23,642 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:01:24,598 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3741#(and (= (select |old(#valid)| 1) 1) (= (select |old(#length)| 1) 2) (= (select |old(#valid)| 0) 0) (not (= |#StackHeapBarrier| 0)) (= (select (select |old(#memory_int)| 1) 0) 48) (= |#NULL.offset| 0) (= 21 (select |old(#length)| 2)) (= (select (select |old(#memory_int)| 1) 1) 0) (= (select |old(#valid)| 2) 1) (= |#NULL.base| 0))' at error location [2023-04-01 11:01:24,598 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:01:24,598 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:01:24,598 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 11 [2023-04-01 11:01:24,599 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938020738] [2023-04-01 11:01:24,599 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:01:24,599 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-04-01 11:01:24,599 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:01:24,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-04-01 11:01:24,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=433, Unknown=2, NotChecked=0, Total=506 [2023-04-01 11:01:24,600 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand has 11 states, 10 states have (on average 2.2) internal successors, (22), 11 states have internal predecessors, (22), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2023-04-01 11:01:24,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:01:24,697 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2023-04-01 11:01:24,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-01 11:01:24,698 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.2) internal successors, (22), 11 states have internal predecessors, (22), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 33 [2023-04-01 11:01:24,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:01:24,698 INFO L225 Difference]: With dead ends: 49 [2023-04-01 11:01:24,698 INFO L226 Difference]: Without dead ends: 45 [2023-04-01 11:01:24,699 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 72 SyntacticMatches, 15 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=75, Invalid=475, Unknown=2, NotChecked=0, Total=552 [2023-04-01 11:01:24,699 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 4 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 11:01:24,700 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 125 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 11:01:24,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2023-04-01 11:01:24,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 41. [2023-04-01 11:01:24,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 32 states have internal predecessors, (35), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2023-04-01 11:01:24,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 47 transitions. [2023-04-01 11:01:24,708 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 47 transitions. Word has length 33 [2023-04-01 11:01:24,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:01:24,708 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 47 transitions. [2023-04-01 11:01:24,709 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.2) internal successors, (22), 11 states have internal predecessors, (22), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2023-04-01 11:01:24,709 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 47 transitions. [2023-04-01 11:01:24,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-04-01 11:01:24,709 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:01:24,709 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:01:24,717 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-04-01 11:01:24,915 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-04-01 11:01:24,915 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:01:24,915 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:01:24,915 INFO L85 PathProgramCache]: Analyzing trace with hash -650865164, now seen corresponding path program 4 times [2023-04-01 11:01:24,915 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:01:24,915 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [161625577] [2023-04-01 11:01:24,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:01:24,915 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:01:24,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:01:25,929 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 11:01:25,929 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:01:25,929 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [161625577] [2023-04-01 11:01:25,929 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [161625577] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:01:25,929 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [441183118] [2023-04-01 11:01:25,929 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 11:01:25,930 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:01:25,930 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:01:25,931 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 11:01:25,934 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-04-01 11:01:26,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:01:26,066 INFO L262 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 89 conjunts are in the unsatisfiable core [2023-04-01 11:01:26,070 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:01:26,077 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-04-01 11:01:26,097 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 11:01:26,102 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 11:01:26,133 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2023-04-01 11:01:26,134 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2023-04-01 11:01:26,190 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2023-04-01 11:01:26,200 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2023-04-01 11:01:26,263 INFO L321 Elim1Store]: treesize reduction 8, result has 61.9 percent of original size [2023-04-01 11:01:26,263 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 22 [2023-04-01 11:01:26,362 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2023-04-01 11:01:26,363 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 50 treesize of output 43 [2023-04-01 11:01:26,372 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 11:01:26,373 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 40 [2023-04-01 11:01:27,013 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 11:01:27,013 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:01:29,735 WARN L839 $PredicateComparison]: unable to prove that (and (forall ((v_sll_create_~new_head~0.base_105 Int)) (or (not (= (select |c_#valid| v_sll_create_~new_head~0.base_105) 0)) (= (select (let ((.cse0 (store |c_#memory_$Pointer$.base| v_sll_create_~new_head~0.base_105 (store (select |c_#memory_$Pointer$.base| v_sll_create_~new_head~0.base_105) 0 c_sll_create_~head~0.base)))) (select .cse0 (select (select .cse0 c_sll_create_~head~0.base) c_sll_create_~head~0.offset))) (select (select (store |c_#memory_$Pointer$.offset| v_sll_create_~new_head~0.base_105 (store (select |c_#memory_$Pointer$.offset| v_sll_create_~new_head~0.base_105) 0 c_sll_create_~head~0.offset)) c_sll_create_~head~0.base) c_sll_create_~head~0.offset)) 0))) (forall ((v_sll_create_~new_head~0.base_105 Int)) (or (= (let ((.cse1 (store |c_#memory_$Pointer$.offset| v_sll_create_~new_head~0.base_105 (store (select |c_#memory_$Pointer$.offset| v_sll_create_~new_head~0.base_105) 0 c_sll_create_~head~0.offset)))) (select (select .cse1 (select (select (store |c_#memory_$Pointer$.base| v_sll_create_~new_head~0.base_105 (store (select |c_#memory_$Pointer$.base| v_sll_create_~new_head~0.base_105) 0 c_sll_create_~head~0.base)) c_sll_create_~head~0.base) c_sll_create_~head~0.offset)) (select (select .cse1 c_sll_create_~head~0.base) c_sll_create_~head~0.offset))) 0) (not (= (select |c_#valid| v_sll_create_~new_head~0.base_105) 0))))) is different from false [2023-04-01 11:01:35,095 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 11:01:35,097 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 1046 treesize of output 982 [2023-04-01 11:01:35,108 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 11:01:35,375 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 11:01:35,378 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7710 treesize of output 7198 [2023-04-01 11:01:35,401 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 11:01:35,853 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 2 trivial. 3 not checked. [2023-04-01 11:01:35,853 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [441183118] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:01:35,853 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [537685754] [2023-04-01 11:01:35,855 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-01 11:01:35,855 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:01:35,855 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:01:35,855 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:01:35,855 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:01:35,878 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 49 for LOIs [2023-04-01 11:01:36,181 INFO L197 IcfgInterpreter]: Interpreting procedure sll_length with input of size 39 for LOIs [2023-04-01 11:01:36,203 INFO L197 IcfgInterpreter]: Interpreting procedure sll_create with input of size 49 for LOIs [2023-04-01 11:01:36,372 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:01:36,375 INFO L180 IcfgInterpreter]: Interpretation finished