/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-simple/dll2n_append_unequal.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 21:45:15,922 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 21:45:15,924 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 21:45:15,960 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 21:45:15,960 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 21:45:15,963 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 21:45:15,966 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 21:45:15,968 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 21:45:15,969 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 21:45:15,973 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 21:45:15,975 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 21:45:15,976 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 21:45:15,976 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 21:45:15,979 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 21:45:15,980 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 21:45:15,981 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 21:45:15,981 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 21:45:15,982 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 21:45:15,984 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 21:45:15,988 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 21:45:15,990 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 21:45:15,991 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 21:45:15,991 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 21:45:15,993 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 21:45:16,005 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-02 21:45:16,005 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-02 21:45:16,005 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-02 21:45:16,007 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-02 21:45:16,008 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-02 21:45:16,009 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-02 21:45:16,009 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 21:45:16,010 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 21:45:16,011 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 21:45:16,012 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 21:45:16,013 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 21:45:16,013 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 21:45:16,013 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 21:45:16,013 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 21:45:16,013 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 21:45:16,014 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 21:45:16,015 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 21:45:16,016 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 21:45:16,042 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 21:45:16,042 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 21:45:16,043 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 21:45:16,043 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 21:45:16,044 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 21:45:16,044 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 21:45:16,044 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 21:45:16,044 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 21:45:16,044 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 21:45:16,044 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 21:45:16,045 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 21:45:16,045 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 21:45:16,045 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 21:45:16,046 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 21:45:16,046 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 21:45:16,046 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 21:45:16,046 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 21:45:16,046 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 21:45:16,047 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 21:45:16,047 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 21:45:16,047 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 21:45:16,047 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 21:45:16,047 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 21:45:16,047 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 21:45:16,047 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 21:45:16,047 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 21:45:16,048 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 21:45:16,048 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 21:45:16,048 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 21:45:16,048 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 21:45:16,048 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 21:45:16,048 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 21:45:16,048 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 21:45:16,049 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 21:45:16,049 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 21:45:16,049 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 21:45:16,049 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 21:45:16,049 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 21:45:16,049 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 21:45:16,049 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 21:45:16,049 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 21:45:16,049 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 21:45:16,282 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 21:45:16,307 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 21:45:16,309 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 21:45:16,310 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 21:45:16,311 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 21:45:16,312 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/list-simple/dll2n_append_unequal.i [2023-04-02 21:45:17,419 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 21:45:17,641 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 21:45:17,641 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-simple/dll2n_append_unequal.i [2023-04-02 21:45:17,656 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6e45c7899/a867b82891874e3ca5b8c6fdfb3cc296/FLAG6c657531a [2023-04-02 21:45:17,668 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6e45c7899/a867b82891874e3ca5b8c6fdfb3cc296 [2023-04-02 21:45:17,670 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 21:45:17,671 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 21:45:17,673 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 21:45:17,673 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 21:45:17,678 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 21:45:17,679 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 09:45:17" (1/1) ... [2023-04-02 21:45:17,680 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@28497da5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 09:45:17, skipping insertion in model container [2023-04-02 21:45:17,680 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 09:45:17" (1/1) ... [2023-04-02 21:45:17,686 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 21:45:17,720 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 21:45:17,967 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-simple/dll2n_append_unequal.i[24457,24470] [2023-04-02 21:45:17,970 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 21:45:17,982 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 21:45:18,030 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-simple/dll2n_append_unequal.i[24457,24470] [2023-04-02 21:45:18,031 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 21:45:18,058 INFO L208 MainTranslator]: Completed translation [2023-04-02 21:45:18,058 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 09:45:18 WrapperNode [2023-04-02 21:45:18,058 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 21:45:18,059 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 21:45:18,059 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 21:45:18,059 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 21:45:18,069 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 09:45:18" (1/1) ... [2023-04-02 21:45:18,069 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 09:45:18" (1/1) ... [2023-04-02 21:45:18,080 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 09:45:18" (1/1) ... [2023-04-02 21:45:18,080 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 09:45:18" (1/1) ... [2023-04-02 21:45:18,094 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 09:45:18" (1/1) ... [2023-04-02 21:45:18,100 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 09:45:18" (1/1) ... [2023-04-02 21:45:18,103 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 09:45:18" (1/1) ... [2023-04-02 21:45:18,105 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 09:45:18" (1/1) ... [2023-04-02 21:45:18,114 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 21:45:18,115 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 21:45:18,115 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 21:45:18,115 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 21:45:18,116 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 09:45:18" (1/1) ... [2023-04-02 21:45:18,121 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 21:45:18,139 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 21:45:18,155 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 21:45:18,162 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 21:45:18,190 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 21:45:18,190 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 21:45:18,190 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 21:45:18,191 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2023-04-02 21:45:18,191 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2023-04-02 21:45:18,191 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2023-04-02 21:45:18,191 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-04-02 21:45:18,191 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_create [2023-04-02 21:45:18,191 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_destroy [2023-04-02 21:45:18,192 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_append [2023-04-02 21:45:18,192 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 21:45:18,192 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 21:45:18,192 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 21:45:18,192 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-04-02 21:45:18,192 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-04-02 21:45:18,192 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 21:45:18,192 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 21:45:18,193 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2023-04-02 21:45:18,193 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2023-04-02 21:45:18,193 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2023-04-02 21:45:18,193 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2023-04-02 21:45:18,193 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2023-04-02 21:45:18,193 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2023-04-02 21:45:18,193 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2023-04-02 21:45:18,193 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2023-04-02 21:45:18,193 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2023-04-02 21:45:18,193 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2023-04-02 21:45:18,194 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2023-04-02 21:45:18,194 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2023-04-02 21:45:18,194 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2023-04-02 21:45:18,194 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2023-04-02 21:45:18,194 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2023-04-02 21:45:18,194 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2023-04-02 21:45:18,194 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2023-04-02 21:45:18,194 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2023-04-02 21:45:18,195 INFO L130 BoogieDeclarations]: Found specification of procedure select [2023-04-02 21:45:18,195 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2023-04-02 21:45:18,195 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2023-04-02 21:45:18,195 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2023-04-02 21:45:18,195 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2023-04-02 21:45:18,195 INFO L130 BoogieDeclarations]: Found specification of procedure random [2023-04-02 21:45:18,195 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2023-04-02 21:45:18,195 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2023-04-02 21:45:18,196 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2023-04-02 21:45:18,196 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2023-04-02 21:45:18,196 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2023-04-02 21:45:18,196 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2023-04-02 21:45:18,196 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2023-04-02 21:45:18,196 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2023-04-02 21:45:18,196 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2023-04-02 21:45:18,196 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2023-04-02 21:45:18,196 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2023-04-02 21:45:18,197 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2023-04-02 21:45:18,197 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2023-04-02 21:45:18,197 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2023-04-02 21:45:18,197 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2023-04-02 21:45:18,197 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2023-04-02 21:45:18,197 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2023-04-02 21:45:18,197 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2023-04-02 21:45:18,197 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2023-04-02 21:45:18,198 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2023-04-02 21:45:18,198 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2023-04-02 21:45:18,198 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2023-04-02 21:45:18,198 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2023-04-02 21:45:18,198 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2023-04-02 21:45:18,198 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2023-04-02 21:45:18,198 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2023-04-02 21:45:18,198 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2023-04-02 21:45:18,198 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2023-04-02 21:45:18,199 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2023-04-02 21:45:18,199 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2023-04-02 21:45:18,199 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2023-04-02 21:45:18,199 INFO L130 BoogieDeclarations]: Found specification of procedure free [2023-04-02 21:45:18,199 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2023-04-02 21:45:18,199 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2023-04-02 21:45:18,199 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2023-04-02 21:45:18,199 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2023-04-02 21:45:18,199 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2023-04-02 21:45:18,199 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2023-04-02 21:45:18,200 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2023-04-02 21:45:18,200 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2023-04-02 21:45:18,200 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2023-04-02 21:45:18,200 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2023-04-02 21:45:18,200 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2023-04-02 21:45:18,200 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2023-04-02 21:45:18,200 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2023-04-02 21:45:18,200 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2023-04-02 21:45:18,200 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2023-04-02 21:45:18,201 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2023-04-02 21:45:18,201 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2023-04-02 21:45:18,201 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2023-04-02 21:45:18,201 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2023-04-02 21:45:18,201 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2023-04-02 21:45:18,201 INFO L130 BoogieDeclarations]: Found specification of procedure system [2023-04-02 21:45:18,201 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2023-04-02 21:45:18,201 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2023-04-02 21:45:18,201 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2023-04-02 21:45:18,201 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2023-04-02 21:45:18,202 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2023-04-02 21:45:18,202 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2023-04-02 21:45:18,202 INFO L130 BoogieDeclarations]: Found specification of procedure div [2023-04-02 21:45:18,202 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2023-04-02 21:45:18,202 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2023-04-02 21:45:18,202 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2023-04-02 21:45:18,202 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2023-04-02 21:45:18,202 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2023-04-02 21:45:18,202 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2023-04-02 21:45:18,202 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2023-04-02 21:45:18,203 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2023-04-02 21:45:18,203 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2023-04-02 21:45:18,203 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2023-04-02 21:45:18,203 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2023-04-02 21:45:18,203 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2023-04-02 21:45:18,203 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2023-04-02 21:45:18,203 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2023-04-02 21:45:18,203 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2023-04-02 21:45:18,203 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2023-04-02 21:45:18,204 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2023-04-02 21:45:18,204 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2023-04-02 21:45:18,204 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2023-04-02 21:45:18,204 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2023-04-02 21:45:18,204 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2023-04-02 21:45:18,204 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-04-02 21:45:18,204 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-04-02 21:45:18,204 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-04-02 21:45:18,204 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 21:45:18,205 INFO L130 BoogieDeclarations]: Found specification of procedure dll_create [2023-04-02 21:45:18,205 INFO L130 BoogieDeclarations]: Found specification of procedure dll_destroy [2023-04-02 21:45:18,205 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-04-02 21:45:18,205 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 21:45:18,205 INFO L130 BoogieDeclarations]: Found specification of procedure dll_append [2023-04-02 21:45:18,205 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 21:45:18,205 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-02 21:45:18,205 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-04-02 21:45:18,205 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 21:45:18,205 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 21:45:18,206 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 21:45:18,206 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 21:45:18,398 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 21:45:18,400 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 21:45:18,463 INFO L771 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2023-04-02 21:45:18,682 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 21:45:18,732 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 21:45:18,733 INFO L302 CfgBuilder]: Removed 4 assume(true) statements. [2023-04-02 21:45:18,735 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 09:45:18 BoogieIcfgContainer [2023-04-02 21:45:18,735 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 21:45:18,737 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 21:45:18,737 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 21:45:18,740 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 21:45:18,741 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 09:45:17" (1/3) ... [2023-04-02 21:45:18,741 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b1a491d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 09:45:18, skipping insertion in model container [2023-04-02 21:45:18,741 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 09:45:18" (2/3) ... [2023-04-02 21:45:18,742 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b1a491d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 09:45:18, skipping insertion in model container [2023-04-02 21:45:18,742 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 09:45:18" (3/3) ... [2023-04-02 21:45:18,743 INFO L112 eAbstractionObserver]: Analyzing ICFG dll2n_append_unequal.i [2023-04-02 21:45:18,759 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 21:45:18,759 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 21:45:18,813 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 21:45:18,820 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;@2d1c66fa, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 21:45:18,821 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 21:45:18,824 INFO L276 IsEmpty]: Start isEmpty. Operand has 48 states, 32 states have (on average 1.40625) internal successors, (45), 33 states have internal predecessors, (45), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-04-02 21:45:18,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-04-02 21:45:18,832 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 21:45:18,832 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 21:45:18,833 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 21:45:18,840 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 21:45:18,840 INFO L85 PathProgramCache]: Analyzing trace with hash -950459372, now seen corresponding path program 1 times [2023-04-02 21:45:18,848 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 21:45:18,848 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404016316] [2023-04-02 21:45:18,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 21:45:18,849 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 21:45:18,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 21:45:19,249 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 21:45:19,250 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 21:45:19,250 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [404016316] [2023-04-02 21:45:19,250 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [404016316] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 21:45:19,251 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 21:45:19,251 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-02 21:45:19,252 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [232935657] [2023-04-02 21:45:19,253 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 21:45:19,256 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-02 21:45:19,256 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 21:45:19,290 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-02 21:45:19,291 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-02 21:45:19,293 INFO L87 Difference]: Start difference. First operand has 48 states, 32 states have (on average 1.40625) internal successors, (45), 33 states have internal predecessors, (45), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 5 states, 3 states have (on average 5.333333333333333) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2023-04-02 21:45:19,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 21:45:19,410 INFO L93 Difference]: Finished difference Result 89 states and 114 transitions. [2023-04-02 21:45:19,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-04-02 21:45:19,413 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 5.333333333333333) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 25 [2023-04-02 21:45:19,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 21:45:19,419 INFO L225 Difference]: With dead ends: 89 [2023-04-02 21:45:19,419 INFO L226 Difference]: Without dead ends: 39 [2023-04-02 21:45:19,422 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-04-02 21:45:19,425 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 19 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 21:45:19,426 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 171 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 21:45:19,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2023-04-02 21:45:19,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2023-04-02 21:45:19,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 26 states have internal predecessors, (33), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-02 21:45:19,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 44 transitions. [2023-04-02 21:45:19,462 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 44 transitions. Word has length 25 [2023-04-02 21:45:19,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 21:45:19,462 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 44 transitions. [2023-04-02 21:45:19,462 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 5.333333333333333) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2023-04-02 21:45:19,462 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 44 transitions. [2023-04-02 21:45:19,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-04-02 21:45:19,464 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 21:45:19,464 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 21:45:19,464 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 21:45:19,464 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 21:45:19,465 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 21:45:19,465 INFO L85 PathProgramCache]: Analyzing trace with hash -613663315, now seen corresponding path program 1 times [2023-04-02 21:45:19,465 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 21:45:19,465 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1161851743] [2023-04-02 21:45:19,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 21:45:19,466 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 21:45:19,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 21:45:19,780 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 21:45:19,780 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 21:45:19,781 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1161851743] [2023-04-02 21:45:19,781 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1161851743] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 21:45:19,781 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1621479325] [2023-04-02 21:45:19,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 21:45:19,781 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 21:45:19,782 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 21:45:19,793 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 21:45:19,815 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 21:45:20,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 21:45:20,006 INFO L262 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 5 conjunts are in the unsatisfiable core [2023-04-02 21:45:20,019 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 21:45:20,103 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 21:45:20,103 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 21:45:20,274 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 21:45:20,275 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1621479325] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 21:45:20,275 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1425290858] [2023-04-02 21:45:20,294 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-04-02 21:45:20,295 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 21:45:20,297 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 21:45:20,302 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 21:45:20,303 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 21:45:20,382 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-04-02 21:45:20,949 INFO L197 IcfgInterpreter]: Interpreting procedure dll_append with input of size 36 for LOIs [2023-04-02 21:45:21,182 INFO L197 IcfgInterpreter]: Interpreting procedure dll_create with input of size 44 for LOIs [2023-04-02 21:45:21,571 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 15 for LOIs [2023-04-02 21:45:21,590 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 21:45:21,593 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 21:45:23,034 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '437#(and (= main_~data~0 1) (<= 1 |#StackHeapBarrier|) (= |main_~#s~0.offset| 0) (= main_~count~0 0) (= main_~ptr~0.base (select (select |#memory_$Pointer$.base| |main_~#s~0.base|) 0)) (= (select (select |#memory_$Pointer$.offset| main_~ptr~0.base) (+ main_~ptr~0.offset 4)) 0) (= main_~len~0 2) (= (select (select |#memory_$Pointer$.base| main_~ptr~0.base) (+ main_~ptr~0.offset 4)) 0) (= |#NULL.offset| 0) (= 5 main_~uneq~0) (= (select (select |#memory_$Pointer$.offset| |main_~#s~0.base|) 0) main_~ptr~0.offset) (<= (+ |#StackHeapBarrier| 1) |main_~#s~0.base|) (= |#NULL.base| 0))' at error location [2023-04-02 21:45:23,035 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 21:45:23,035 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 21:45:23,035 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-04-02 21:45:23,036 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898853007] [2023-04-02 21:45:23,036 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 21:45:23,036 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-04-02 21:45:23,037 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 21:45:23,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-04-02 21:45:23,038 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=1052, Unknown=0, NotChecked=0, Total=1190 [2023-04-02 21:45:23,039 INFO L87 Difference]: Start difference. First operand 37 states and 44 transitions. Second operand has 12 states, 8 states have (on average 4.25) internal successors, (34), 12 states have internal predecessors, (34), 7 states have call successors, (11), 2 states have call predecessors, (11), 4 states have return successors, (10), 5 states have call predecessors, (10), 7 states have call successors, (10) [2023-04-02 21:45:23,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 21:45:23,129 INFO L93 Difference]: Finished difference Result 68 states and 83 transitions. [2023-04-02 21:45:23,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-02 21:45:23,129 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 8 states have (on average 4.25) internal successors, (34), 12 states have internal predecessors, (34), 7 states have call successors, (11), 2 states have call predecessors, (11), 4 states have return successors, (10), 5 states have call predecessors, (10), 7 states have call successors, (10) Word has length 32 [2023-04-02 21:45:23,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 21:45:23,130 INFO L225 Difference]: With dead ends: 68 [2023-04-02 21:45:23,130 INFO L226 Difference]: Without dead ends: 42 [2023-04-02 21:45:23,131 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=154, Invalid=1178, Unknown=0, NotChecked=0, Total=1332 [2023-04-02 21:45:23,132 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 31 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 21:45:23,133 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 159 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 21:45:23,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2023-04-02 21:45:23,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2023-04-02 21:45:23,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 28 states have (on average 1.25) internal successors, (35), 28 states have internal predecessors, (35), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-02 21:45:23,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2023-04-02 21:45:23,139 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 32 [2023-04-02 21:45:23,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 21:45:23,139 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2023-04-02 21:45:23,140 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 8 states have (on average 4.25) internal successors, (34), 12 states have internal predecessors, (34), 7 states have call successors, (11), 2 states have call predecessors, (11), 4 states have return successors, (10), 5 states have call predecessors, (10), 7 states have call successors, (10) [2023-04-02 21:45:23,140 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2023-04-02 21:45:23,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-04-02 21:45:23,141 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 21:45:23,141 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 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] [2023-04-02 21:45:23,151 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 21:45:23,348 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 21:45:23,348 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 21:45:23,349 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 21:45:23,349 INFO L85 PathProgramCache]: Analyzing trace with hash -1360079372, now seen corresponding path program 2 times [2023-04-02 21:45:23,349 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 21:45:23,349 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105009117] [2023-04-02 21:45:23,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 21:45:23,350 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 21:45:23,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 21:45:23,928 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-02 21:45:23,929 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 21:45:23,930 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [105009117] [2023-04-02 21:45:23,930 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [105009117] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 21:45:23,930 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1492168796] [2023-04-02 21:45:23,930 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 21:45:23,930 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 21:45:23,931 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 21:45:23,932 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 21:45:23,955 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 21:45:24,124 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-02 21:45:24,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 21:45:24,127 INFO L262 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 36 conjunts are in the unsatisfiable core [2023-04-02 21:45:24,131 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 21:45:24,260 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 4 [2023-04-02 21:45:24,311 WARN L861 $PredicateComparison]: unable to prove that (exists ((node_create_~temp~0.base Int)) (and (<= (+ node_create_~temp~0.base 1) |c_#StackHeapBarrier|) (exists ((v_ArrVal_367 (Array Int Int))) (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| node_create_~temp~0.base v_ArrVal_367))))) is different from true [2023-04-02 21:45:26,475 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 1 not checked. [2023-04-02 21:45:26,476 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 21:45:26,544 WARN L839 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_373 (Array Int Int)) (v_node_create_~temp~0.base_24 Int)) (or (<= |c_#StackHeapBarrier| v_node_create_~temp~0.base_24) (not (= (select (select (store |c_#memory_$Pointer$.base| v_node_create_~temp~0.base_24 v_ArrVal_373) |c_main_~#s~0.base|) |c_main_~#s~0.offset|) 0)))) is different from false [2023-04-02 21:45:26,546 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1492168796] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 21:45:26,546 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1941093903] [2023-04-02 21:45:26,549 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-04-02 21:45:26,549 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 21:45:26,549 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 21:45:26,549 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 21:45:26,549 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 21:45:26,564 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-04-02 21:45:26,786 INFO L197 IcfgInterpreter]: Interpreting procedure dll_append with input of size 36 for LOIs [2023-04-02 21:45:26,942 INFO L197 IcfgInterpreter]: Interpreting procedure dll_create with input of size 44 for LOIs [2023-04-02 21:45:27,231 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 15 for LOIs [2023-04-02 21:45:27,250 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 21:45:27,253 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 21:45:28,986 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '771#(and (= main_~data~0 1) (<= 1 |#StackHeapBarrier|) (= |main_~#s~0.offset| 0) (= main_~count~0 0) (= main_~ptr~0.base (select (select |#memory_$Pointer$.base| |main_~#s~0.base|) 0)) (= (select (select |#memory_$Pointer$.offset| main_~ptr~0.base) (+ main_~ptr~0.offset 4)) 0) (= main_~len~0 2) (= (select (select |#memory_$Pointer$.base| main_~ptr~0.base) (+ main_~ptr~0.offset 4)) 0) (= |#NULL.offset| 0) (= 5 main_~uneq~0) (= (select (select |#memory_$Pointer$.offset| |main_~#s~0.base|) 0) main_~ptr~0.offset) (<= (+ |#StackHeapBarrier| 1) |main_~#s~0.base|) (= |#NULL.base| 0))' at error location [2023-04-02 21:45:28,986 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 21:45:28,986 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 21:45:28,986 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 25 [2023-04-02 21:45:28,986 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296057880] [2023-04-02 21:45:28,986 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 21:45:28,987 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-04-02 21:45:28,987 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 21:45:28,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-04-02 21:45:28,989 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=1968, Unknown=23, NotChecked=182, Total=2352 [2023-04-02 21:45:28,989 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 25 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 19 states have internal predecessors, (32), 7 states have call successors, (9), 2 states have call predecessors, (9), 7 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2023-04-02 21:45:29,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 21:45:29,499 INFO L93 Difference]: Finished difference Result 52 states and 63 transitions. [2023-04-02 21:45:29,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-04-02 21:45:29,500 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 19 states have internal predecessors, (32), 7 states have call successors, (9), 2 states have call predecessors, (9), 7 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) Word has length 39 [2023-04-02 21:45:29,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 21:45:29,501 INFO L225 Difference]: With dead ends: 52 [2023-04-02 21:45:29,501 INFO L226 Difference]: Without dead ends: 40 [2023-04-02 21:45:29,502 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 723 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=216, Invalid=2628, Unknown=26, NotChecked=210, Total=3080 [2023-04-02 21:45:29,503 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 42 mSDsluCounter, 260 mSDsCounter, 0 mSdLazyCounter, 279 mSolverCounterSat, 9 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 291 SdHoareTripleChecker+Invalid, 342 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 279 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 47 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-02 21:45:29,503 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 291 Invalid, 342 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 279 Invalid, 7 Unknown, 47 Unchecked, 0.4s Time] [2023-04-02 21:45:29,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2023-04-02 21:45:29,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2023-04-02 21:45:29,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 28 states have (on average 1.2142857142857142) internal successors, (34), 28 states have internal predecessors, (34), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-02 21:45:29,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 47 transitions. [2023-04-02 21:45:29,509 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 47 transitions. Word has length 39 [2023-04-02 21:45:29,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 21:45:29,510 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 47 transitions. [2023-04-02 21:45:29,510 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 19 states have internal predecessors, (32), 7 states have call successors, (9), 2 states have call predecessors, (9), 7 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2023-04-02 21:45:29,510 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 47 transitions. [2023-04-02 21:45:29,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-04-02 21:45:29,511 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 21:45:29,511 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 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] [2023-04-02 21:45:29,525 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-04-02 21:45:29,720 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,SelfDestructingSolverStorable2 [2023-04-02 21:45:29,720 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 21:45:29,720 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 21:45:29,721 INFO L85 PathProgramCache]: Analyzing trace with hash 272964696, now seen corresponding path program 1 times [2023-04-02 21:45:29,721 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 21:45:29,721 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1266975308] [2023-04-02 21:45:29,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 21:45:29,721 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 21:45:29,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 21:45:31,472 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 21:45:31,472 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 21:45:31,472 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1266975308] [2023-04-02 21:45:31,472 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1266975308] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 21:45:31,472 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2025049910] [2023-04-02 21:45:31,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 21:45:31,473 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 21:45:31,473 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 21:45:31,474 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 21:45:31,476 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 21:45:31,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 21:45:31,655 INFO L262 TraceCheckSpWp]: Trace formula consists of 479 conjuncts, 96 conjunts are in the unsatisfiable core [2023-04-02 21:45:31,660 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 21:45:31,673 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 6 treesize of output 5 [2023-04-02 21:45:31,796 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2023-04-02 21:45:31,798 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2023-04-02 21:45:31,853 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2023-04-02 21:45:31,865 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 16 [2023-04-02 21:45:31,878 INFO L321 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-04-02 21:45:31,879 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 43 [2023-04-02 21:45:32,098 INFO L321 Elim1Store]: treesize reduction 17, result has 5.6 percent of original size [2023-04-02 21:45:32,098 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 84 treesize of output 29 [2023-04-02 21:45:32,109 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 21:45:32,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 21:45:32,639 INFO L321 Elim1Store]: treesize reduction 59, result has 43.8 percent of original size [2023-04-02 21:45:32,639 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 106 treesize of output 153 [2023-04-02 21:45:32,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 21:45:32,752 INFO L321 Elim1Store]: treesize reduction 138, result has 31.3 percent of original size [2023-04-02 21:45:32,752 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 152 treesize of output 199 [2023-04-02 21:45:32,778 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 17 [2023-04-02 21:45:32,802 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 37 [2023-04-02 21:45:32,846 INFO L321 Elim1Store]: treesize reduction 8, result has 75.8 percent of original size [2023-04-02 21:45:32,847 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 28 treesize of output 34 [2023-04-02 21:45:32,924 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 16 treesize of output 15 [2023-04-02 21:45:33,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 21:45:33,171 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 77 treesize of output 22 [2023-04-02 21:45:33,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 21:45:33,230 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 21:45:33,232 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 286 treesize of output 213 [2023-04-02 21:45:33,435 INFO L321 Elim1Store]: treesize reduction 20, result has 56.5 percent of original size [2023-04-02 21:45:33,436 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 509 treesize of output 514 [2023-04-02 21:45:33,699 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 21:45:33,819 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 21:45:33,819 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 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 28 treesize of output 18 [2023-04-02 21:45:33,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 21:45:33,883 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 433 treesize of output 423 [2023-04-02 21:45:34,057 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 21:45:34,059 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 258 treesize of output 256 [2023-04-02 21:45:34,080 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 32 [2023-04-02 21:45:34,143 INFO L321 Elim1Store]: treesize reduction 17, result has 5.6 percent of original size [2023-04-02 21:45:34,144 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 75 treesize of output 24 [2023-04-02 21:45:34,178 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 11 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 21:45:34,178 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 21:45:34,471 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2025049910] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 21:45:34,471 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [843418885] [2023-04-02 21:45:34,474 INFO L159 IcfgInterpreter]: Started Sifa with 31 locations of interest [2023-04-02 21:45:34,474 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 21:45:34,474 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 21:45:34,474 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 21:45:34,474 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 21:45:34,489 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-04-02 21:45:34,728 INFO L197 IcfgInterpreter]: Interpreting procedure dll_append with input of size 36 for LOIs [2023-04-02 21:45:34,889 INFO L197 IcfgInterpreter]: Interpreting procedure dll_create with input of size 44 for LOIs [2023-04-02 21:45:35,115 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 15 for LOIs [2023-04-02 21:45:35,129 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 21:45:35,132 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 21:45:41,699 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1117#(and (= main_~data~0 1) (<= 1 |#StackHeapBarrier|) (= |main_~#s~0.offset| 0) (= main_~count~0 0) (= main_~ptr~0.base (select (select |#memory_$Pointer$.base| |main_~#s~0.base|) 0)) (= (select (select |#memory_$Pointer$.offset| main_~ptr~0.base) (+ main_~ptr~0.offset 4)) 0) (= main_~len~0 2) (= (select (select |#memory_$Pointer$.base| main_~ptr~0.base) (+ main_~ptr~0.offset 4)) 0) (= |#NULL.offset| 0) (= 5 main_~uneq~0) (= (select (select |#memory_$Pointer$.offset| |main_~#s~0.base|) 0) main_~ptr~0.offset) (<= (+ |#StackHeapBarrier| 1) |main_~#s~0.base|) (= |#NULL.base| 0))' at error location [2023-04-02 21:45:41,699 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 21:45:41,699 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 21:45:41,699 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 25] total 39 [2023-04-02 21:45:41,699 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1549043293] [2023-04-02 21:45:41,699 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 21:45:41,700 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2023-04-02 21:45:41,700 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 21:45:41,701 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2023-04-02 21:45:41,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=225, Invalid=4182, Unknown=15, NotChecked=0, Total=4422 [2023-04-02 21:45:41,702 INFO L87 Difference]: Start difference. First operand 40 states and 47 transitions. Second operand has 39 states, 28 states have (on average 1.6071428571428572) internal successors, (45), 31 states have internal predecessors, (45), 7 states have call successors, (9), 3 states have call predecessors, (9), 10 states have return successors, (10), 10 states have call predecessors, (10), 7 states have call successors, (10) [2023-04-02 21:45:44,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 21:45:44,240 INFO L93 Difference]: Finished difference Result 57 states and 69 transitions. [2023-04-02 21:45:44,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-04-02 21:45:44,241 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 28 states have (on average 1.6071428571428572) internal successors, (45), 31 states have internal predecessors, (45), 7 states have call successors, (9), 3 states have call predecessors, (9), 10 states have return successors, (10), 10 states have call predecessors, (10), 7 states have call successors, (10) Word has length 42 [2023-04-02 21:45:44,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 21:45:44,242 INFO L225 Difference]: With dead ends: 57 [2023-04-02 21:45:44,242 INFO L226 Difference]: Without dead ends: 44 [2023-04-02 21:45:44,244 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2019 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=373, Invalid=7258, Unknown=25, NotChecked=0, Total=7656 [2023-04-02 21:45:44,245 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 52 mSDsluCounter, 380 mSDsCounter, 0 mSdLazyCounter, 842 mSolverCounterSat, 18 mSolverCounterUnsat, 14 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 403 SdHoareTripleChecker+Invalid, 874 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 842 IncrementalHoareTripleChecker+Invalid, 14 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2023-04-02 21:45:44,245 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 403 Invalid, 874 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 842 Invalid, 14 Unknown, 0 Unchecked, 1.1s Time] [2023-04-02 21:45:44,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-04-02 21:45:44,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2023-04-02 21:45:44,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 30 states have internal predecessors, (35), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-02 21:45:44,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 48 transitions. [2023-04-02 21:45:44,252 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 48 transitions. Word has length 42 [2023-04-02 21:45:44,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 21:45:44,252 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 48 transitions. [2023-04-02 21:45:44,253 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 28 states have (on average 1.6071428571428572) internal successors, (45), 31 states have internal predecessors, (45), 7 states have call successors, (9), 3 states have call predecessors, (9), 10 states have return successors, (10), 10 states have call predecessors, (10), 7 states have call successors, (10) [2023-04-02 21:45:44,253 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 48 transitions. [2023-04-02 21:45:44,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-04-02 21:45:44,254 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 21:45:44,254 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 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] [2023-04-02 21:45:44,261 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 21:45:44,461 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 21:45:44,461 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 21:45:44,462 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 21:45:44,462 INFO L85 PathProgramCache]: Analyzing trace with hash 1471204879, now seen corresponding path program 1 times [2023-04-02 21:45:44,462 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 21:45:44,462 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2099232295] [2023-04-02 21:45:44,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 21:45:44,462 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 21:45:44,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 21:46:06,968 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 5 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 21:46:06,968 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 21:46:06,968 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2099232295] [2023-04-02 21:46:06,968 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2099232295] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 21:46:06,968 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [584368585] [2023-04-02 21:46:06,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 21:46:06,969 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 21:46:06,969 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 21:46:06,973 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 21:46:06,976 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 21:46:07,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 21:46:07,178 INFO L262 TraceCheckSpWp]: Trace formula consists of 492 conjuncts, 155 conjunts are in the unsatisfiable core [2023-04-02 21:46:07,189 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 21:46:07,587 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 6 treesize of output 5 [2023-04-02 21:46:09,216 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2023-04-02 21:46:10,600 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2023-04-02 21:46:10,601 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2023-04-02 21:46:11,071 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 21 [2023-04-02 21:46:11,078 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2023-04-02 21:46:11,085 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 14 [2023-04-02 21:46:11,097 INFO L321 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-04-02 21:46:11,098 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 53 treesize of output 48 [2023-04-02 21:46:11,109 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2023-04-02 21:46:12,746 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 21:46:12,746 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 81 treesize of output 36 [2023-04-02 21:46:12,752 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-04-02 21:46:12,759 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 21:46:12,764 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-04-02 21:46:14,461 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 21:46:14,465 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 21:46:14,833 INFO L321 Elim1Store]: treesize reduction 803, result has 18.9 percent of original size [2023-04-02 21:46:14,838 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 4 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 10 new quantified variables, introduced 26 case distinctions, treesize of input 675 treesize of output 1066 [2023-04-02 21:46:14,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 21:46:14,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 21:46:15,205 INFO L321 Elim1Store]: treesize reduction 294, result has 22.0 percent of original size [2023-04-02 21:46:15,206 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 4 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 9 new quantified variables, introduced 19 case distinctions, treesize of input 1161 treesize of output 1437 [2023-04-02 21:46:15,433 INFO L321 Elim1Store]: treesize reduction 20, result has 58.3 percent of original size [2023-04-02 21:46:15,434 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 967 treesize of output 892 [2023-04-02 21:46:15,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 21:46:15,511 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 21:46:15,620 INFO L321 Elim1Store]: treesize reduction 60, result has 27.7 percent of original size [2023-04-02 21:46:15,620 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 5 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 146 treesize of output 269 [2023-04-02 21:46:15,680 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 47 treesize of output 51 [2023-04-02 21:46:15,825 INFO L321 Elim1Store]: treesize reduction 8, result has 86.0 percent of original size [2023-04-02 21:46:15,825 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 42 treesize of output 58 [2023-04-02 21:46:15,986 INFO L321 Elim1Store]: treesize reduction 281, result has 19.3 percent of original size [2023-04-02 21:46:15,986 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 692 treesize of output 238 [2023-04-02 21:46:16,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 21:46:16,161 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 21:46:16,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 21:46:16,191 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 21:46:16,276 INFO L217 Elim1Store]: Index analysis took 119 ms [2023-04-02 21:46:16,451 INFO L321 Elim1Store]: treesize reduction 541, result has 13.6 percent of original size [2023-04-02 21:46:16,452 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 4 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 10 case distinctions, treesize of input 3341 treesize of output 7568 [2023-04-02 21:46:16,889 WARN L207 Elim1Store]: Array PQE input equivalent to false [2023-04-02 21:46:17,098 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 1002 treesize of output 973 [2023-04-02 21:46:17,384 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 2701 treesize of output 2698 [2023-04-02 21:46:17,438 WARN L207 Elim1Store]: Array PQE input equivalent to false [2023-04-02 21:46:17,531 WARN L207 Elim1Store]: Array PQE input equivalent to false [2023-04-02 21:46:20,254 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-04-02 21:46:57,741 WARN L223 SmtUtils]: Spent 12.77s on a formula simplification that was a NOOP. DAG size: 335 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)