/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain OctagonDomain -i ../sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 21:55:03,801 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 21:55:03,803 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 21:55:03,848 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 21:55:03,848 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 21:55:03,851 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 21:55:03,854 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 21:55:03,857 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 21:55:03,858 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 21:55:03,863 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 21:55:03,864 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 21:55:03,866 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 21:55:03,866 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 21:55:03,869 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 21:55:03,872 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 21:55:03,873 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 21:55:03,874 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 21:55:03,875 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 21:55:03,877 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 21:55:03,881 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 21:55:03,882 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 21:55:03,885 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 21:55:03,886 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 21:55:03,887 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 21:55:03,891 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-02 21:55:03,892 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-02 21:55:03,892 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-02 21:55:03,893 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-02 21:55:03,894 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-02 21:55:03,894 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-02 21:55:03,894 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 21:55:03,895 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 21:55:03,896 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 21:55:03,897 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 21:55:03,897 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 21:55:03,897 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 21:55:03,898 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 21:55:03,898 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 21:55:03,898 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 21:55:03,899 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 21:55:03,900 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 21:55:03,901 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-02 21:55:03,933 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 21:55:03,934 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 21:55:03,934 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 21:55:03,934 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 21:55:03,935 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 21:55:03,935 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 21:55:03,935 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 21:55:03,935 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 21:55:03,935 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 21:55:03,935 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 21:55:03,936 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 21:55:03,936 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 21:55:03,936 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 21:55:03,937 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 21:55:03,937 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 21:55:03,937 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 21:55:03,937 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 21:55:03,937 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 21:55:03,938 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 21:55:03,938 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 21:55:03,938 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 21:55:03,938 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 21:55:03,938 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 21:55:03,938 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 21:55:03,939 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 21:55:03,939 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 21:55:03,939 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 21:55:03,939 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 21:55:03,939 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 21:55:03,939 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 21:55:03,939 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 21:55:03,940 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 21:55:03,940 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 21:55:03,940 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 21:55:03,940 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 21:55:03,940 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 21:55:03,940 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 21:55:03,940 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 21:55:03,940 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 21:55:03,941 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 21:55:03,941 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 21:55:03,941 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 21:55:04,183 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 21:55:04,211 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 21:55:04,215 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 21:55:04,217 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 21:55:04,217 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 21:55:04,219 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i [2023-04-02 21:55:05,362 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 21:55:05,636 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 21:55:05,637 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i [2023-04-02 21:55:05,651 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/05aec9b56/724d890d20554074994d4e62cc3625fa/FLAG01f2887c5 [2023-04-02 21:55:05,667 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/05aec9b56/724d890d20554074994d4e62cc3625fa [2023-04-02 21:55:05,669 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 21:55:05,671 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 21:55:05,674 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 21:55:05,674 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 21:55:05,677 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 21:55:05,678 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 09:55:05" (1/1) ... [2023-04-02 21:55:05,679 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7e7b8ccd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 09:55:05, skipping insertion in model container [2023-04-02 21:55:05,680 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 09:55:05" (1/1) ... [2023-04-02 21:55:05,685 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 21:55:05,732 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 21:55:05,952 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_of_sll_nondet_append-1.i[24987,25000] [2023-04-02 21:55:05,956 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 21:55:05,964 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 21:55:06,026 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_of_sll_nondet_append-1.i[24987,25000] [2023-04-02 21:55:06,027 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 21:55:06,057 INFO L208 MainTranslator]: Completed translation [2023-04-02 21:55:06,057 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 09:55:06 WrapperNode [2023-04-02 21:55:06,057 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 21:55:06,058 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 21:55:06,058 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 21:55:06,059 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 21:55:06,068 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 09:55:06" (1/1) ... [2023-04-02 21:55:06,068 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 09:55:06" (1/1) ... [2023-04-02 21:55:06,080 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 09:55:06" (1/1) ... [2023-04-02 21:55:06,081 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 09:55:06" (1/1) ... [2023-04-02 21:55:06,095 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 09:55:06" (1/1) ... [2023-04-02 21:55:06,100 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 09:55:06" (1/1) ... [2023-04-02 21:55:06,103 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 09:55:06" (1/1) ... [2023-04-02 21:55:06,105 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 09:55:06" (1/1) ... [2023-04-02 21:55:06,111 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 21:55:06,112 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 21:55:06,112 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 21:55:06,116 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 21:55:06,117 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 09:55:06" (1/1) ... [2023-04-02 21:55:06,121 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 21:55:06,130 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 21:55:06,145 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-02 21:55:06,147 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-02 21:55:06,179 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 21:55:06,180 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 21:55:06,180 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 21:55:06,180 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2023-04-02 21:55:06,180 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2023-04-02 21:55:06,180 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2023-04-02 21:55:06,180 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_create [2023-04-02 21:55:06,180 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create_with_sublist [2023-04-02 21:55:06,180 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_length [2023-04-02 21:55:06,181 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_append [2023-04-02 21:55:06,181 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_hierarchical_destroy [2023-04-02 21:55:06,181 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 21:55:06,181 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 21:55:06,181 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 21:55:06,181 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-04-02 21:55:06,181 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-04-02 21:55:06,181 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 21:55:06,181 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 21:55:06,181 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-02 21:55:06,181 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2023-04-02 21:55:06,181 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2023-04-02 21:55:06,182 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2023-04-02 21:55:06,182 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2023-04-02 21:55:06,182 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2023-04-02 21:55:06,182 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2023-04-02 21:55:06,182 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2023-04-02 21:55:06,182 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2023-04-02 21:55:06,183 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2023-04-02 21:55:06,183 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2023-04-02 21:55:06,183 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2023-04-02 21:55:06,183 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2023-04-02 21:55:06,183 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2023-04-02 21:55:06,183 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2023-04-02 21:55:06,183 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2023-04-02 21:55:06,183 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2023-04-02 21:55:06,184 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2023-04-02 21:55:06,184 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2023-04-02 21:55:06,184 INFO L130 BoogieDeclarations]: Found specification of procedure select [2023-04-02 21:55:06,184 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2023-04-02 21:55:06,184 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2023-04-02 21:55:06,184 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2023-04-02 21:55:06,184 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2023-04-02 21:55:06,184 INFO L130 BoogieDeclarations]: Found specification of procedure random [2023-04-02 21:55:06,185 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2023-04-02 21:55:06,185 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2023-04-02 21:55:06,186 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2023-04-02 21:55:06,186 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2023-04-02 21:55:06,186 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2023-04-02 21:55:06,186 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2023-04-02 21:55:06,187 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2023-04-02 21:55:06,187 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2023-04-02 21:55:06,187 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2023-04-02 21:55:06,187 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2023-04-02 21:55:06,187 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2023-04-02 21:55:06,187 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2023-04-02 21:55:06,188 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2023-04-02 21:55:06,188 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2023-04-02 21:55:06,188 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2023-04-02 21:55:06,188 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2023-04-02 21:55:06,188 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2023-04-02 21:55:06,189 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2023-04-02 21:55:06,189 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2023-04-02 21:55:06,189 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2023-04-02 21:55:06,189 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2023-04-02 21:55:06,189 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2023-04-02 21:55:06,189 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2023-04-02 21:55:06,189 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2023-04-02 21:55:06,189 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2023-04-02 21:55:06,189 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2023-04-02 21:55:06,189 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2023-04-02 21:55:06,189 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2023-04-02 21:55:06,190 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2023-04-02 21:55:06,190 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2023-04-02 21:55:06,190 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2023-04-02 21:55:06,190 INFO L130 BoogieDeclarations]: Found specification of procedure free [2023-04-02 21:55:06,190 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2023-04-02 21:55:06,190 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2023-04-02 21:55:06,190 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2023-04-02 21:55:06,190 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2023-04-02 21:55:06,191 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2023-04-02 21:55:06,191 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2023-04-02 21:55:06,191 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2023-04-02 21:55:06,192 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2023-04-02 21:55:06,192 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2023-04-02 21:55:06,210 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2023-04-02 21:55:06,210 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2023-04-02 21:55:06,210 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2023-04-02 21:55:06,211 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2023-04-02 21:55:06,216 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2023-04-02 21:55:06,216 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2023-04-02 21:55:06,216 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2023-04-02 21:55:06,216 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2023-04-02 21:55:06,217 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2023-04-02 21:55:06,217 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2023-04-02 21:55:06,217 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2023-04-02 21:55:06,217 INFO L130 BoogieDeclarations]: Found specification of procedure system [2023-04-02 21:55:06,217 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2023-04-02 21:55:06,217 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2023-04-02 21:55:06,217 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2023-04-02 21:55:06,217 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2023-04-02 21:55:06,217 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2023-04-02 21:55:06,217 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2023-04-02 21:55:06,217 INFO L130 BoogieDeclarations]: Found specification of procedure div [2023-04-02 21:55:06,218 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2023-04-02 21:55:06,218 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2023-04-02 21:55:06,218 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2023-04-02 21:55:06,218 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2023-04-02 21:55:06,218 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2023-04-02 21:55:06,218 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2023-04-02 21:55:06,218 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2023-04-02 21:55:06,219 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2023-04-02 21:55:06,219 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2023-04-02 21:55:06,219 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2023-04-02 21:55:06,219 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2023-04-02 21:55:06,219 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2023-04-02 21:55:06,219 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2023-04-02 21:55:06,220 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2023-04-02 21:55:06,221 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2023-04-02 21:55:06,221 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2023-04-02 21:55:06,221 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2023-04-02 21:55:06,221 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2023-04-02 21:55:06,222 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2023-04-02 21:55:06,224 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2023-04-02 21:55:06,225 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2023-04-02 21:55:06,229 INFO L130 BoogieDeclarations]: Found specification of procedure sll_create [2023-04-02 21:55:06,229 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-04-02 21:55:06,229 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-04-02 21:55:06,229 INFO L130 BoogieDeclarations]: Found specification of procedure node_create_with_sublist [2023-04-02 21:55:06,230 INFO L130 BoogieDeclarations]: Found specification of procedure sll_length [2023-04-02 21:55:06,230 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-04-02 21:55:06,230 INFO L130 BoogieDeclarations]: Found specification of procedure sll_append [2023-04-02 21:55:06,230 INFO L130 BoogieDeclarations]: Found specification of procedure sll_hierarchical_destroy [2023-04-02 21:55:06,230 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 21:55:06,230 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 21:55:06,230 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-02 21:55:06,230 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-04-02 21:55:06,230 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 21:55:06,230 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 21:55:06,230 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 21:55:06,230 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 21:55:06,231 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 21:55:06,535 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 21:55:06,537 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 21:55:06,591 INFO L771 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2023-04-02 21:55:06,837 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 21:55:06,875 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 21:55:06,876 INFO L302 CfgBuilder]: Removed 9 assume(true) statements. [2023-04-02 21:55:06,878 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 09:55:06 BoogieIcfgContainer [2023-04-02 21:55:06,878 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 21:55:06,880 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 21:55:06,880 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 21:55:06,883 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 21:55:06,883 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 09:55:05" (1/3) ... [2023-04-02 21:55:06,884 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e7f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 09:55:06, skipping insertion in model container [2023-04-02 21:55:06,884 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 09:55:06" (2/3) ... [2023-04-02 21:55:06,884 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e7f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 09:55:06, skipping insertion in model container [2023-04-02 21:55:06,884 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 09:55:06" (3/3) ... [2023-04-02 21:55:06,886 INFO L112 eAbstractionObserver]: Analyzing ICFG sll_of_sll_nondet_append-1.i [2023-04-02 21:55:06,902 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 21:55:06,902 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 21:55:06,940 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 21:55:06,946 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;@ea13f98, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 21:55:06,946 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 21:55:06,949 INFO L276 IsEmpty]: Start isEmpty. Operand has 58 states, 40 states have (on average 1.475) internal successors, (59), 42 states have internal predecessors, (59), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-04-02 21:55:06,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-04-02 21:55:06,954 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 21:55:06,954 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 21:55:06,955 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 21:55:06,958 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 21:55:06,959 INFO L85 PathProgramCache]: Analyzing trace with hash 249607366, now seen corresponding path program 1 times [2023-04-02 21:55:06,965 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 21:55:06,965 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1613244545] [2023-04-02 21:55:06,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 21:55:06,966 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 21:55:07,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 21:55:07,247 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 21:55:07,248 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 21:55:07,248 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1613244545] [2023-04-02 21:55:07,249 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1613244545] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 21:55:07,249 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 21:55:07,249 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-02 21:55:07,250 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615133284] [2023-04-02 21:55:07,251 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 21:55:07,255 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-02 21:55:07,256 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 21:55:07,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-02 21:55:07,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-04-02 21:55:07,287 INFO L87 Difference]: Start difference. First operand has 58 states, 40 states have (on average 1.475) internal successors, (59), 42 states have internal predecessors, (59), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 21:55:07,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 21:55:07,415 INFO L93 Difference]: Finished difference Result 121 states and 164 transitions. [2023-04-02 21:55:07,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-04-02 21:55:07,418 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2023-04-02 21:55:07,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 21:55:07,429 INFO L225 Difference]: With dead ends: 121 [2023-04-02 21:55:07,429 INFO L226 Difference]: Without dead ends: 49 [2023-04-02 21:55:07,433 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-04-02 21:55:07,438 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 12 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 21:55:07,439 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 162 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 21:55:07,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2023-04-02 21:55:07,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2023-04-02 21:55:07,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 36 states have (on average 1.3055555555555556) internal successors, (47), 36 states have internal predecessors, (47), 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) [2023-04-02 21:55:07,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 58 transitions. [2023-04-02 21:55:07,472 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 58 transitions. Word has length 9 [2023-04-02 21:55:07,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 21:55:07,472 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 58 transitions. [2023-04-02 21:55:07,473 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 21:55:07,473 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 58 transitions. [2023-04-02 21:55:07,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-04-02 21:55:07,474 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 21:55:07,474 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 21:55:07,474 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 21:55:07,474 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 21:55:07,475 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 21:55:07,475 INFO L85 PathProgramCache]: Analyzing trace with hash 1336111407, now seen corresponding path program 1 times [2023-04-02 21:55:07,475 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 21:55:07,476 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [255077114] [2023-04-02 21:55:07,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 21:55:07,476 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 21:55:07,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 21:55:07,668 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-02 21:55:07,669 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 21:55:07,669 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [255077114] [2023-04-02 21:55:07,669 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [255077114] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 21:55:07,669 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 21:55:07,669 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-02 21:55:07,669 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [868195828] [2023-04-02 21:55:07,670 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 21:55:07,671 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-02 21:55:07,671 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 21:55:07,672 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-02 21:55:07,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-04-02 21:55:07,672 INFO L87 Difference]: Start difference. First operand 48 states and 58 transitions. Second operand has 4 states, 4 states have (on average 5.25) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-04-02 21:55:07,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 21:55:07,737 INFO L93 Difference]: Finished difference Result 70 states and 86 transitions. [2023-04-02 21:55:07,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-02 21:55:07,737 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 31 [2023-04-02 21:55:07,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 21:55:07,739 INFO L225 Difference]: With dead ends: 70 [2023-04-02 21:55:07,739 INFO L226 Difference]: Without dead ends: 68 [2023-04-02 21:55:07,739 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-04-02 21:55:07,743 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 39 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 21:55:07,744 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 94 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 21:55:07,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2023-04-02 21:55:07,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 50. [2023-04-02 21:55:07,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 38 states have (on average 1.2894736842105263) internal successors, (49), 38 states have internal predecessors, (49), 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) [2023-04-02 21:55:07,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2023-04-02 21:55:07,769 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 31 [2023-04-02 21:55:07,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 21:55:07,769 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2023-04-02 21:55:07,769 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-04-02 21:55:07,769 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2023-04-02 21:55:07,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-04-02 21:55:07,770 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 21:55:07,770 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 21:55:07,771 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-02 21:55:07,771 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 21:55:07,771 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 21:55:07,771 INFO L85 PathProgramCache]: Analyzing trace with hash 1619512054, now seen corresponding path program 1 times [2023-04-02 21:55:07,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 21:55:07,772 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1426646729] [2023-04-02 21:55:07,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 21:55:07,772 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 21:55:07,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 21:55:07,935 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 21:55:07,936 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 21:55:07,936 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1426646729] [2023-04-02 21:55:07,936 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1426646729] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 21:55:07,937 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [606398148] [2023-04-02 21:55:07,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 21:55:07,937 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 21:55:07,937 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 21:55:07,941 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 21:55:07,964 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-02 21:55:08,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 21:55:08,142 INFO L262 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 9 conjunts are in the unsatisfiable core [2023-04-02 21:55:08,149 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 21:55:08,296 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 21:55:08,297 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-02 21:55:08,297 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [606398148] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 21:55:08,297 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-02 21:55:08,297 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [4] total 11 [2023-04-02 21:55:08,298 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [31355086] [2023-04-02 21:55:08,298 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 21:55:08,298 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-04-02 21:55:08,298 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 21:55:08,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-04-02 21:55:08,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2023-04-02 21:55:08,299 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 9 states, 7 states have (on average 4.142857142857143) internal successors, (29), 9 states have internal predecessors, (29), 5 states have call successors, (6), 2 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-02 21:55:08,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 21:55:08,518 INFO L93 Difference]: Finished difference Result 115 states and 141 transitions. [2023-04-02 21:55:08,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-02 21:55:08,519 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 4.142857142857143) internal successors, (29), 9 states have internal predecessors, (29), 5 states have call successors, (6), 2 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) Word has length 40 [2023-04-02 21:55:08,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 21:55:08,520 INFO L225 Difference]: With dead ends: 115 [2023-04-02 21:55:08,520 INFO L226 Difference]: Without dead ends: 64 [2023-04-02 21:55:08,521 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2023-04-02 21:55:08,522 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 39 mSDsluCounter, 256 mSDsCounter, 0 mSdLazyCounter, 192 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 300 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 192 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 21:55:08,522 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 300 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 192 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 21:55:08,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2023-04-02 21:55:08,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 51. [2023-04-02 21:55:08,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 39 states have (on average 1.2820512820512822) internal successors, (50), 39 states have internal predecessors, (50), 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) [2023-04-02 21:55:08,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 61 transitions. [2023-04-02 21:55:08,534 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 61 transitions. Word has length 40 [2023-04-02 21:55:08,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 21:55:08,535 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 61 transitions. [2023-04-02 21:55:08,535 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 4.142857142857143) internal successors, (29), 9 states have internal predecessors, (29), 5 states have call successors, (6), 2 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-02 21:55:08,535 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 61 transitions. [2023-04-02 21:55:08,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-04-02 21:55:08,538 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 21:55:08,538 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 21:55:08,550 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-02 21:55:08,744 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 [2023-04-02 21:55:08,745 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 21:55:08,745 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 21:55:08,746 INFO L85 PathProgramCache]: Analyzing trace with hash 1816740127, now seen corresponding path program 1 times [2023-04-02 21:55:08,746 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 21:55:08,746 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [748226491] [2023-04-02 21:55:08,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 21:55:08,746 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 21:55:08,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 21:55:08,934 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-02 21:55:08,935 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 21:55:08,935 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [748226491] [2023-04-02 21:55:08,935 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [748226491] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 21:55:08,936 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1740916367] [2023-04-02 21:55:08,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 21:55:08,936 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 21:55:08,936 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 21:55:08,945 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) [2023-04-02 21:55:08,963 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-02 21:55:09,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 21:55:09,115 INFO L262 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-02 21:55:09,120 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 21:55:09,227 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 21:55:09,227 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 21:55:09,641 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 21:55:09,642 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1740916367] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 21:55:09,642 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [499506646] [2023-04-02 21:55:09,664 INFO L159 IcfgInterpreter]: Started Sifa with 40 locations of interest [2023-04-02 21:55:09,664 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 21:55:09,667 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 21:55:09,672 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 21:55:09,672 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 21:55:09,739 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-04-02 21:55:10,810 INFO L197 IcfgInterpreter]: Interpreting procedure sll_length with input of size 68 for LOIs [2023-04-02 21:55:10,870 INFO L197 IcfgInterpreter]: Interpreting procedure sll_append with input of size 42 for LOIs [2023-04-02 21:55:10,991 INFO L197 IcfgInterpreter]: Interpreting procedure node_create_with_sublist with input of size 30 for LOIs [2023-04-02 21:55:11,059 INFO L197 IcfgInterpreter]: Interpreting procedure sll_create with input of size 45 for LOIs [2023-04-02 21:55:11,148 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 21:55:11,151 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 21:55:17,401 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1138#(and (or (not (= (+ main_~i~0 1) 0)) (<= (+ main_~max~0 1) 0)) (= main_~count~0 0) (<= main_~i~0 main_~max~0) (not (= main_~i~0 0)) (= main_~min~0 main_~i~0))' at error location [2023-04-02 21:55:17,401 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 21:55:17,402 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 21:55:17,402 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 10, 10] total 17 [2023-04-02 21:55:17,402 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333203986] [2023-04-02 21:55:17,402 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 21:55:17,402 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-04-02 21:55:17,402 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 21:55:17,403 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-04-02 21:55:17,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=1976, Unknown=3, NotChecked=0, Total=2162 [2023-04-02 21:55:17,405 INFO L87 Difference]: Start difference. First operand 51 states and 61 transitions. Second operand has 17 states, 14 states have (on average 4.714285714285714) internal successors, (66), 17 states have internal predecessors, (66), 9 states have call successors, (13), 2 states have call predecessors, (13), 5 states have return successors, (12), 5 states have call predecessors, (12), 9 states have call successors, (12) [2023-04-02 21:55:17,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 21:55:17,675 INFO L93 Difference]: Finished difference Result 139 states and 174 transitions. [2023-04-02 21:55:17,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-02 21:55:17,676 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 14 states have (on average 4.714285714285714) internal successors, (66), 17 states have internal predecessors, (66), 9 states have call successors, (13), 2 states have call predecessors, (13), 5 states have return successors, (12), 5 states have call predecessors, (12), 9 states have call successors, (12) Word has length 43 [2023-04-02 21:55:17,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 21:55:17,677 INFO L225 Difference]: With dead ends: 139 [2023-04-02 21:55:17,677 INFO L226 Difference]: Without dead ends: 87 [2023-04-02 21:55:17,678 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 84 SyntacticMatches, 4 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 748 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=217, Invalid=2432, Unknown=3, NotChecked=0, Total=2652 [2023-04-02 21:55:17,679 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 66 mSDsluCounter, 325 mSDsCounter, 0 mSdLazyCounter, 276 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 369 SdHoareTripleChecker+Invalid, 293 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 276 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 21:55:17,680 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 369 Invalid, 293 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 276 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 21:55:17,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2023-04-02 21:55:17,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 63. [2023-04-02 21:55:17,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 50 states have (on average 1.26) internal successors, (63), 50 states have internal predecessors, (63), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-02 21:55:17,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 76 transitions. [2023-04-02 21:55:17,688 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 76 transitions. Word has length 43 [2023-04-02 21:55:17,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 21:55:17,688 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 76 transitions. [2023-04-02 21:55:17,689 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 14 states have (on average 4.714285714285714) internal successors, (66), 17 states have internal predecessors, (66), 9 states have call successors, (13), 2 states have call predecessors, (13), 5 states have return successors, (12), 5 states have call predecessors, (12), 9 states have call successors, (12) [2023-04-02 21:55:17,689 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 76 transitions. [2023-04-02 21:55:17,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-04-02 21:55:17,690 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 21:55:17,690 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 21:55:17,704 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-02 21:55:17,901 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 [2023-04-02 21:55:17,901 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 21:55:17,902 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 21:55:17,902 INFO L85 PathProgramCache]: Analyzing trace with hash -1886780834, now seen corresponding path program 2 times [2023-04-02 21:55:17,902 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 21:55:17,902 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1367169452] [2023-04-02 21:55:17,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 21:55:17,902 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 21:55:17,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 21:55:18,020 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-04-02 21:55:18,020 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 21:55:18,020 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1367169452] [2023-04-02 21:55:18,020 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1367169452] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 21:55:18,020 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1054295881] [2023-04-02 21:55:18,020 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 21:55:18,021 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 21:55:18,021 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 21:55:18,022 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) [2023-04-02 21:55:18,037 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-02 21:55:18,180 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-02 21:55:18,180 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 21:55:18,182 INFO L262 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-02 21:55:18,184 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 21:55:18,235 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-04-02 21:55:18,235 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 21:55:18,276 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-04-02 21:55:18,277 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1054295881] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 21:55:18,277 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1714088046] [2023-04-02 21:55:18,279 INFO L159 IcfgInterpreter]: Started Sifa with 40 locations of interest [2023-04-02 21:55:18,280 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 21:55:18,280 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 21:55:18,280 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 21:55:18,280 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 21:55:18,294 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-04-02 21:55:18,903 INFO L197 IcfgInterpreter]: Interpreting procedure sll_length with input of size 68 for LOIs [2023-04-02 21:55:18,968 INFO L197 IcfgInterpreter]: Interpreting procedure sll_append with input of size 42 for LOIs [2023-04-02 21:55:19,048 INFO L197 IcfgInterpreter]: Interpreting procedure node_create_with_sublist with input of size 30 for LOIs [2023-04-02 21:55:19,098 INFO L197 IcfgInterpreter]: Interpreting procedure sll_create with input of size 45 for LOIs [2023-04-02 21:55:19,158 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 21:55:19,161 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 21:55:26,322 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1773#(and (or (not (= (+ main_~i~0 1) 0)) (<= (+ main_~max~0 1) 0)) (= main_~count~0 0) (<= main_~i~0 main_~max~0) (not (= main_~i~0 0)) (= main_~min~0 main_~i~0))' at error location [2023-04-02 21:55:26,322 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 21:55:26,322 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 21:55:26,322 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2023-04-02 21:55:26,322 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1382039518] [2023-04-02 21:55:26,322 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 21:55:26,323 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-04-02 21:55:26,323 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 21:55:26,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-04-02 21:55:26,324 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=1245, Unknown=5, NotChecked=0, Total=1406 [2023-04-02 21:55:26,324 INFO L87 Difference]: Start difference. First operand 63 states and 76 transitions. Second operand has 8 states, 8 states have (on average 6.125) internal successors, (49), 8 states have internal predecessors, (49), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2023-04-02 21:55:26,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 21:55:26,399 INFO L93 Difference]: Finished difference Result 104 states and 128 transitions. [2023-04-02 21:55:26,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-02 21:55:26,400 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 6.125) internal successors, (49), 8 states have internal predecessors, (49), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 50 [2023-04-02 21:55:26,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 21:55:26,401 INFO L225 Difference]: With dead ends: 104 [2023-04-02 21:55:26,401 INFO L226 Difference]: Without dead ends: 88 [2023-04-02 21:55:26,402 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 115 SyntacticMatches, 3 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 489 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=156, Invalid=1245, Unknown=5, NotChecked=0, Total=1406 [2023-04-02 21:55:26,403 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 20 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 21:55:26,403 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 119 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 21:55:26,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2023-04-02 21:55:26,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 74. [2023-04-02 21:55:26,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 60 states have (on average 1.25) internal successors, (75), 60 states have internal predecessors, (75), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-04-02 21:55:26,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 90 transitions. [2023-04-02 21:55:26,413 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 90 transitions. Word has length 50 [2023-04-02 21:55:26,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 21:55:26,413 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 90 transitions. [2023-04-02 21:55:26,413 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 6.125) internal successors, (49), 8 states have internal predecessors, (49), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2023-04-02 21:55:26,414 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 90 transitions. [2023-04-02 21:55:26,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-04-02 21:55:26,415 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 21:55:26,415 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 21:55:26,429 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-02 21:55:26,620 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 [2023-04-02 21:55:26,621 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 21:55:26,621 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 21:55:26,621 INFO L85 PathProgramCache]: Analyzing trace with hash -551808410, now seen corresponding path program 3 times [2023-04-02 21:55:26,622 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 21:55:26,622 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1939764046] [2023-04-02 21:55:26,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 21:55:26,622 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 21:55:26,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 21:55:26,928 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 21 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 21:55:26,929 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 21:55:26,929 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1939764046] [2023-04-02 21:55:26,929 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1939764046] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 21:55:26,929 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [67282378] [2023-04-02 21:55:26,929 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 21:55:26,929 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 21:55:26,929 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 21:55:26,930 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) [2023-04-02 21:55:26,933 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-02 21:55:27,089 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 21:55:27,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 21:55:27,091 INFO L262 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 13 conjunts are in the unsatisfiable core [2023-04-02 21:55:27,096 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 21:55:27,153 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 21 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 21:55:27,153 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 21:55:27,533 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 21 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 21:55:27,533 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [67282378] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 21:55:27,534 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [257861182] [2023-04-02 21:55:27,536 INFO L159 IcfgInterpreter]: Started Sifa with 40 locations of interest [2023-04-02 21:55:27,536 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 21:55:27,536 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 21:55:27,537 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 21:55:27,537 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 21:55:27,551 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-04-02 21:55:28,177 INFO L197 IcfgInterpreter]: Interpreting procedure sll_length with input of size 68 for LOIs [2023-04-02 21:55:28,213 INFO L197 IcfgInterpreter]: Interpreting procedure sll_append with input of size 42 for LOIs [2023-04-02 21:55:28,282 INFO L197 IcfgInterpreter]: Interpreting procedure node_create_with_sublist with input of size 30 for LOIs [2023-04-02 21:55:28,336 INFO L197 IcfgInterpreter]: Interpreting procedure sll_create with input of size 45 for LOIs [2023-04-02 21:55:28,394 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 21:55:28,397 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 21:55:37,785 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2405#(and (or (not (= (+ main_~i~0 1) 0)) (<= (+ main_~max~0 1) 0)) (= main_~count~0 0) (<= main_~i~0 main_~max~0) (not (= main_~i~0 0)) (= main_~min~0 main_~i~0))' at error location [2023-04-02 21:55:37,785 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 21:55:37,785 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 21:55:37,785 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2023-04-02 21:55:37,785 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1028711380] [2023-04-02 21:55:37,785 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 21:55:37,786 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-04-02 21:55:37,786 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 21:55:37,786 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-04-02 21:55:37,787 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=2241, Unknown=6, NotChecked=0, Total=2450 [2023-04-02 21:55:37,787 INFO L87 Difference]: Start difference. First operand 74 states and 90 transitions. Second operand has 20 states, 17 states have (on average 3.8823529411764706) internal successors, (66), 20 states have internal predecessors, (66), 8 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (9), 4 states have call predecessors, (9), 8 states have call successors, (9) [2023-04-02 21:55:38,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 21:55:38,057 INFO L93 Difference]: Finished difference Result 159 states and 196 transitions. [2023-04-02 21:55:38,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-02 21:55:38,058 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 3.8823529411764706) internal successors, (66), 20 states have internal predecessors, (66), 8 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (9), 4 states have call predecessors, (9), 8 states have call successors, (9) Word has length 54 [2023-04-02 21:55:38,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 21:55:38,059 INFO L225 Difference]: With dead ends: 159 [2023-04-02 21:55:38,059 INFO L226 Difference]: Without dead ends: 91 [2023-04-02 21:55:38,060 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 121 SyntacticMatches, 5 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 894 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=220, Invalid=2530, Unknown=6, NotChecked=0, Total=2756 [2023-04-02 21:55:38,061 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 48 mSDsluCounter, 448 mSDsCounter, 0 mSdLazyCounter, 390 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 499 SdHoareTripleChecker+Invalid, 398 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 390 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 21:55:38,061 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 499 Invalid, 398 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 390 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 21:55:38,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2023-04-02 21:55:38,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 86. [2023-04-02 21:55:38,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 71 states have (on average 1.2394366197183098) internal successors, (88), 71 states have internal predecessors, (88), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-04-02 21:55:38,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 105 transitions. [2023-04-02 21:55:38,071 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 105 transitions. Word has length 54 [2023-04-02 21:55:38,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 21:55:38,071 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 105 transitions. [2023-04-02 21:55:38,071 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 3.8823529411764706) internal successors, (66), 20 states have internal predecessors, (66), 8 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (9), 4 states have call predecessors, (9), 8 states have call successors, (9) [2023-04-02 21:55:38,071 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 105 transitions. [2023-04-02 21:55:38,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2023-04-02 21:55:38,072 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 21:55:38,072 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 21:55:38,081 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-02 21:55:38,278 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 [2023-04-02 21:55:38,279 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 21:55:38,279 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 21:55:38,279 INFO L85 PathProgramCache]: Analyzing trace with hash -1783725137, now seen corresponding path program 4 times [2023-04-02 21:55:38,279 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 21:55:38,279 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2012537533] [2023-04-02 21:55:38,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 21:55:38,280 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 21:55:38,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 21:55:38,566 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 21 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 21:55:38,566 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 21:55:38,566 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2012537533] [2023-04-02 21:55:38,566 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2012537533] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 21:55:38,566 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [913553107] [2023-04-02 21:55:38,566 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 21:55:38,566 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 21:55:38,567 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 21:55:38,567 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) [2023-04-02 21:55:38,569 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-02 21:55:38,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 21:55:38,712 INFO L262 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 14 conjunts are in the unsatisfiable core [2023-04-02 21:55:38,714 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 21:55:38,777 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 21 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 21:55:38,777 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 21:55:39,213 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 21 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 21:55:39,213 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [913553107] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 21:55:39,213 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1951109837] [2023-04-02 21:55:39,215 INFO L159 IcfgInterpreter]: Started Sifa with 40 locations of interest [2023-04-02 21:55:39,215 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 21:55:39,216 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 21:55:39,216 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 21:55:39,216 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 21:55:39,231 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-04-02 21:55:39,735 INFO L197 IcfgInterpreter]: Interpreting procedure sll_length with input of size 68 for LOIs [2023-04-02 21:55:39,775 INFO L197 IcfgInterpreter]: Interpreting procedure sll_append with input of size 42 for LOIs [2023-04-02 21:55:39,846 INFO L197 IcfgInterpreter]: Interpreting procedure node_create_with_sublist with input of size 30 for LOIs [2023-04-02 21:55:39,893 INFO L197 IcfgInterpreter]: Interpreting procedure sll_create with input of size 45 for LOIs [2023-04-02 21:55:39,949 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 21:55:39,952 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 21:55:46,993 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3151#(and (or (not (= (+ main_~i~0 1) 0)) (<= (+ main_~max~0 1) 0)) (= main_~count~0 0) (<= main_~i~0 main_~max~0) (not (= main_~i~0 0)) (= main_~min~0 main_~i~0))' at error location [2023-04-02 21:55:46,993 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 21:55:46,993 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 21:55:46,994 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 21 [2023-04-02 21:55:46,994 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808763990] [2023-04-02 21:55:46,994 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 21:55:46,994 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-04-02 21:55:46,994 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 21:55:46,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-04-02 21:55:46,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=2337, Unknown=5, NotChecked=0, Total=2550 [2023-04-02 21:55:46,996 INFO L87 Difference]: Start difference. First operand 86 states and 105 transitions. Second operand has 21 states, 18 states have (on average 3.7777777777777777) internal successors, (68), 21 states have internal predecessors, (68), 8 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (9), 4 states have call predecessors, (9), 8 states have call successors, (9) [2023-04-02 21:55:47,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 21:55:47,218 INFO L93 Difference]: Finished difference Result 168 states and 205 transitions. [2023-04-02 21:55:47,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-04-02 21:55:47,219 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 18 states have (on average 3.7777777777777777) internal successors, (68), 21 states have internal predecessors, (68), 8 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (9), 4 states have call predecessors, (9), 8 states have call successors, (9) Word has length 57 [2023-04-02 21:55:47,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 21:55:47,220 INFO L225 Difference]: With dead ends: 168 [2023-04-02 21:55:47,220 INFO L226 Difference]: Without dead ends: 104 [2023-04-02 21:55:47,221 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 129 SyntacticMatches, 6 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 962 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=226, Invalid=2631, Unknown=5, NotChecked=0, Total=2862 [2023-04-02 21:55:47,222 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 48 mSDsluCounter, 368 mSDsCounter, 0 mSdLazyCounter, 330 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 419 SdHoareTripleChecker+Invalid, 338 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 330 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 21:55:47,222 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [57 Valid, 419 Invalid, 338 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 330 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 21:55:47,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2023-04-02 21:55:47,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 99. [2023-04-02 21:55:47,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 81 states have (on average 1.2469135802469136) internal successors, (101), 82 states have internal predecessors, (101), 9 states have call successors, (9), 6 states have call predecessors, (9), 8 states have return successors, (11), 10 states have call predecessors, (11), 8 states have call successors, (11) [2023-04-02 21:55:47,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 121 transitions. [2023-04-02 21:55:47,232 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 121 transitions. Word has length 57 [2023-04-02 21:55:47,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 21:55:47,232 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 121 transitions. [2023-04-02 21:55:47,232 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 18 states have (on average 3.7777777777777777) internal successors, (68), 21 states have internal predecessors, (68), 8 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (9), 4 states have call predecessors, (9), 8 states have call successors, (9) [2023-04-02 21:55:47,232 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 121 transitions. [2023-04-02 21:55:47,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2023-04-02 21:55:47,233 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 21:55:47,234 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 21:55:47,249 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-04-02 21:55:47,440 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 [2023-04-02 21:55:47,441 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 21:55:47,441 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 21:55:47,441 INFO L85 PathProgramCache]: Analyzing trace with hash -1319394874, now seen corresponding path program 5 times [2023-04-02 21:55:47,442 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 21:55:47,442 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [627771607] [2023-04-02 21:55:47,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 21:55:47,442 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 21:55:47,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 21:55:47,726 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 21 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 21:55:47,726 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 21:55:47,726 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [627771607] [2023-04-02 21:55:47,726 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [627771607] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 21:55:47,726 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [970156214] [2023-04-02 21:55:47,727 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 21:55:47,727 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 21:55:47,727 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 21:55:47,729 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) [2023-04-02 21:55:47,752 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-02 21:55:47,906 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-02 21:55:47,906 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 21:55:47,908 INFO L262 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 88 conjunts are in the unsatisfiable core [2023-04-02 21:55:47,912 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 21:55:47,950 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 [2023-04-02 21:55:48,190 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 14 treesize of output 15 [2023-04-02 21:55:48,195 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 14 treesize of output 15 [2023-04-02 21:55:48,301 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 31 [2023-04-02 21:55:48,306 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 29 treesize of output 28 [2023-04-02 21:55:48,371 INFO L321 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2023-04-02 21:55:48,371 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 36 [2023-04-02 21:55:48,391 INFO L321 Elim1Store]: treesize reduction 25, result has 47.9 percent of original size [2023-04-02 21:55:48,391 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 40 [2023-04-02 21:55:48,496 INFO L321 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2023-04-02 21:55:48,497 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 15 treesize of output 15 [2023-04-02 21:55:48,710 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 21:55:48,710 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 79 treesize of output 66 [2023-04-02 21:55:48,727 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 21:55:48,728 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 51 treesize of output 51 [2023-04-02 21:55:48,911 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 7 proven. 11 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-04-02 21:55:48,911 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 21:55:49,968 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 21:55:49,968 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 191344 treesize of output 166768 [2023-04-02 21:55:59,716 WARN L223 SmtUtils]: Spent 9.75s on a formula simplification. DAG size of input: 496 DAG size of output: 573 (called from [L 809] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2023-04-02 21:56:03,333 INFO L321 Elim1Store]: treesize reduction 990, result has 44.4 percent of original size [2023-04-02 21:56:03,335 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 19 select indices, 19 select index equivalence classes, 1 disjoint index pairs (out of 171 index pairs), introduced 22 new quantified variables, introduced 170 case distinctions, treesize of input 172616 treesize of output 164078 [2023-04-02 21:56:21,449 WARN L223 SmtUtils]: Spent 18.11s on a formula simplification. DAG size of input: 2051 DAG size of output: 1301 (called from [L 809] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2023-04-02 21:58:02,096 WARN L223 SmtUtils]: Spent 5.04s on a formula simplification. DAG size of input: 534 DAG size of output: 604 (called from [L 809] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify)