/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 IntervalDomain -i ../sv-benchmarks/c/list-simple/sll2n_prepend_equal.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-03-31 22:55:36,505 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-03-31 22:55:36,507 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-03-31 22:55:36,526 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-03-31 22:55:36,527 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-03-31 22:55:36,527 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-03-31 22:55:36,528 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-03-31 22:55:36,530 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-03-31 22:55:36,531 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-03-31 22:55:36,531 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-03-31 22:55:36,532 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-03-31 22:55:36,533 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-03-31 22:55:36,533 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-03-31 22:55:36,534 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-03-31 22:55:36,534 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-03-31 22:55:36,535 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-03-31 22:55:36,536 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-03-31 22:55:36,536 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-03-31 22:55:36,537 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-03-31 22:55:36,539 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-03-31 22:55:36,540 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-03-31 22:55:36,540 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-03-31 22:55:36,541 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-03-31 22:55:36,542 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-03-31 22:55:36,544 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-03-31 22:55:36,544 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-03-31 22:55:36,544 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-03-31 22:55:36,545 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-03-31 22:55:36,545 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-03-31 22:55:36,546 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-03-31 22:55:36,546 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-03-31 22:55:36,547 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-03-31 22:55:36,547 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-03-31 22:55:36,548 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-03-31 22:55:36,548 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-03-31 22:55:36,549 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-03-31 22:55:36,549 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-03-31 22:55:36,549 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-03-31 22:55:36,550 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-03-31 22:55:36,550 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-03-31 22:55:36,551 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-03-31 22:55:36,551 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 [2023-03-31 22:55:36,565 INFO L113 SettingsManager]: Loading preferences was successful [2023-03-31 22:55:36,566 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-03-31 22:55:36,566 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-03-31 22:55:36,566 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-03-31 22:55:36,567 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-03-31 22:55:36,567 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-03-31 22:55:36,567 INFO L138 SettingsManager]: * User list type=DISABLED [2023-03-31 22:55:36,567 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-03-31 22:55:36,567 INFO L138 SettingsManager]: * Explicit value domain=true [2023-03-31 22:55:36,567 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-03-31 22:55:36,567 INFO L138 SettingsManager]: * Octagon Domain=false [2023-03-31 22:55:36,568 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-03-31 22:55:36,568 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-03-31 22:55:36,568 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-03-31 22:55:36,568 INFO L138 SettingsManager]: * Interval Domain=false [2023-03-31 22:55:36,568 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-03-31 22:55:36,568 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-03-31 22:55:36,568 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-03-31 22:55:36,569 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-03-31 22:55:36,569 INFO L138 SettingsManager]: * sizeof long=4 [2023-03-31 22:55:36,569 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-03-31 22:55:36,569 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-03-31 22:55:36,569 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-03-31 22:55:36,569 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-03-31 22:55:36,570 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-03-31 22:55:36,570 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-03-31 22:55:36,570 INFO L138 SettingsManager]: * sizeof long double=12 [2023-03-31 22:55:36,570 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-03-31 22:55:36,570 INFO L138 SettingsManager]: * Use constant arrays=true [2023-03-31 22:55:36,570 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-03-31 22:55:36,570 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-03-31 22:55:36,571 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-03-31 22:55:36,571 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 22:55:36,571 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-03-31 22:55:36,571 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-03-31 22:55:36,571 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-03-31 22:55:36,571 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-03-31 22:55:36,571 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-03-31 22:55:36,572 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-03-31 22:55:36,572 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-03-31 22:55:36,572 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-03-31 22:55:36,572 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> IntervalDomain [2023-03-31 22:55:36,771 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-03-31 22:55:36,793 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-03-31 22:55:36,795 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-03-31 22:55:36,797 INFO L271 PluginConnector]: Initializing CDTParser... [2023-03-31 22:55:36,798 INFO L275 PluginConnector]: CDTParser initialized [2023-03-31 22:55:36,799 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/list-simple/sll2n_prepend_equal.i [2023-03-31 22:55:37,851 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-03-31 22:55:38,035 INFO L351 CDTParser]: Found 1 translation units. [2023-03-31 22:55:38,036 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-simple/sll2n_prepend_equal.i [2023-03-31 22:55:38,043 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a5f32708e/c85db411d8c041b3b8b9eecaf1f27964/FLAG9400097aa [2023-03-31 22:55:38,053 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a5f32708e/c85db411d8c041b3b8b9eecaf1f27964 [2023-03-31 22:55:38,055 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-03-31 22:55:38,056 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-03-31 22:55:38,056 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-03-31 22:55:38,056 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-03-31 22:55:38,059 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-03-31 22:55:38,059 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 10:55:38" (1/1) ... [2023-03-31 22:55:38,060 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@11081f74 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:55:38, skipping insertion in model container [2023-03-31 22:55:38,061 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 10:55:38" (1/1) ... [2023-03-31 22:55:38,066 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-03-31 22:55:38,104 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-03-31 22:55:38,317 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/sll2n_prepend_equal.i[24076,24089] [2023-03-31 22:55:38,320 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 22:55:38,329 INFO L203 MainTranslator]: Completed pre-run [2023-03-31 22:55:38,367 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/sll2n_prepend_equal.i[24076,24089] [2023-03-31 22:55:38,367 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 22:55:38,389 INFO L208 MainTranslator]: Completed translation [2023-03-31 22:55:38,389 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:55:38 WrapperNode [2023-03-31 22:55:38,389 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-03-31 22:55:38,390 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-03-31 22:55:38,390 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-03-31 22:55:38,390 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-03-31 22:55:38,398 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:55:38" (1/1) ... [2023-03-31 22:55:38,398 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:55:38" (1/1) ... [2023-03-31 22:55:38,407 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:55:38" (1/1) ... [2023-03-31 22:55:38,407 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:55:38" (1/1) ... [2023-03-31 22:55:38,416 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:55:38" (1/1) ... [2023-03-31 22:55:38,419 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:55:38" (1/1) ... [2023-03-31 22:55:38,425 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:55:38" (1/1) ... [2023-03-31 22:55:38,427 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:55:38" (1/1) ... [2023-03-31 22:55:38,430 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-03-31 22:55:38,431 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-03-31 22:55:38,431 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-03-31 22:55:38,431 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-03-31 22:55:38,432 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:55:38" (1/1) ... [2023-03-31 22:55:38,438 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 22:55:38,448 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:55:38,461 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) [2023-03-31 22:55:38,463 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 [2023-03-31 22:55:38,488 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-03-31 22:55:38,488 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-03-31 22:55:38,488 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-03-31 22:55:38,488 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2023-03-31 22:55:38,488 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2023-03-31 22:55:38,488 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2023-03-31 22:55:38,488 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-03-31 22:55:38,488 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_create [2023-03-31 22:55:38,488 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_destroy [2023-03-31 22:55:38,488 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_prepend [2023-03-31 22:55:38,489 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-03-31 22:55:38,489 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-03-31 22:55:38,489 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-03-31 22:55:38,489 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-03-31 22:55:38,489 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-03-31 22:55:38,489 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-03-31 22:55:38,489 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-03-31 22:55:38,489 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2023-03-31 22:55:38,489 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2023-03-31 22:55:38,489 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2023-03-31 22:55:38,489 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2023-03-31 22:55:38,489 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2023-03-31 22:55:38,490 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2023-03-31 22:55:38,490 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2023-03-31 22:55:38,490 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2023-03-31 22:55:38,490 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2023-03-31 22:55:38,490 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2023-03-31 22:55:38,490 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2023-03-31 22:55:38,490 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2023-03-31 22:55:38,490 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2023-03-31 22:55:38,490 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2023-03-31 22:55:38,490 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2023-03-31 22:55:38,490 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2023-03-31 22:55:38,490 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2023-03-31 22:55:38,491 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2023-03-31 22:55:38,491 INFO L130 BoogieDeclarations]: Found specification of procedure select [2023-03-31 22:55:38,491 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2023-03-31 22:55:38,491 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2023-03-31 22:55:38,491 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2023-03-31 22:55:38,491 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2023-03-31 22:55:38,491 INFO L130 BoogieDeclarations]: Found specification of procedure random [2023-03-31 22:55:38,491 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2023-03-31 22:55:38,491 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2023-03-31 22:55:38,491 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2023-03-31 22:55:38,491 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2023-03-31 22:55:38,491 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2023-03-31 22:55:38,491 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2023-03-31 22:55:38,492 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2023-03-31 22:55:38,492 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2023-03-31 22:55:38,492 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2023-03-31 22:55:38,492 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2023-03-31 22:55:38,492 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2023-03-31 22:55:38,492 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2023-03-31 22:55:38,492 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2023-03-31 22:55:38,492 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2023-03-31 22:55:38,492 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2023-03-31 22:55:38,492 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2023-03-31 22:55:38,492 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2023-03-31 22:55:38,492 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2023-03-31 22:55:38,493 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2023-03-31 22:55:38,493 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2023-03-31 22:55:38,493 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2023-03-31 22:55:38,493 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2023-03-31 22:55:38,493 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2023-03-31 22:55:38,493 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2023-03-31 22:55:38,493 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2023-03-31 22:55:38,493 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2023-03-31 22:55:38,493 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2023-03-31 22:55:38,493 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2023-03-31 22:55:38,493 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2023-03-31 22:55:38,493 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2023-03-31 22:55:38,493 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2023-03-31 22:55:38,494 INFO L130 BoogieDeclarations]: Found specification of procedure free [2023-03-31 22:55:38,494 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2023-03-31 22:55:38,494 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2023-03-31 22:55:38,494 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2023-03-31 22:55:38,494 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2023-03-31 22:55:38,494 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2023-03-31 22:55:38,494 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2023-03-31 22:55:38,494 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2023-03-31 22:55:38,494 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2023-03-31 22:55:38,494 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2023-03-31 22:55:38,494 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2023-03-31 22:55:38,494 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2023-03-31 22:55:38,494 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2023-03-31 22:55:38,494 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2023-03-31 22:55:38,494 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2023-03-31 22:55:38,495 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2023-03-31 22:55:38,495 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2023-03-31 22:55:38,495 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2023-03-31 22:55:38,495 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2023-03-31 22:55:38,495 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2023-03-31 22:55:38,495 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2023-03-31 22:55:38,495 INFO L130 BoogieDeclarations]: Found specification of procedure system [2023-03-31 22:55:38,495 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2023-03-31 22:55:38,495 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2023-03-31 22:55:38,495 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2023-03-31 22:55:38,495 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2023-03-31 22:55:38,495 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2023-03-31 22:55:38,495 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2023-03-31 22:55:38,495 INFO L130 BoogieDeclarations]: Found specification of procedure div [2023-03-31 22:55:38,495 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2023-03-31 22:55:38,496 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2023-03-31 22:55:38,496 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2023-03-31 22:55:38,496 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2023-03-31 22:55:38,496 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2023-03-31 22:55:38,496 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2023-03-31 22:55:38,496 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2023-03-31 22:55:38,496 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2023-03-31 22:55:38,496 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2023-03-31 22:55:38,496 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2023-03-31 22:55:38,496 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2023-03-31 22:55:38,496 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2023-03-31 22:55:38,496 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2023-03-31 22:55:38,496 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2023-03-31 22:55:38,496 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2023-03-31 22:55:38,496 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2023-03-31 22:55:38,497 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2023-03-31 22:55:38,497 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2023-03-31 22:55:38,497 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2023-03-31 22:55:38,497 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2023-03-31 22:55:38,497 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2023-03-31 22:55:38,497 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-03-31 22:55:38,497 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-03-31 22:55:38,497 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-03-31 22:55:38,497 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-03-31 22:55:38,497 INFO L130 BoogieDeclarations]: Found specification of procedure sll_create [2023-03-31 22:55:38,497 INFO L130 BoogieDeclarations]: Found specification of procedure sll_destroy [2023-03-31 22:55:38,497 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-03-31 22:55:38,497 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-03-31 22:55:38,497 INFO L130 BoogieDeclarations]: Found specification of procedure sll_prepend [2023-03-31 22:55:38,497 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-03-31 22:55:38,498 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-03-31 22:55:38,498 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-03-31 22:55:38,498 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-03-31 22:55:38,498 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-03-31 22:55:38,498 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-03-31 22:55:38,498 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-03-31 22:55:38,689 INFO L236 CfgBuilder]: Building ICFG [2023-03-31 22:55:38,691 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-03-31 22:55:38,729 INFO L771 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2023-03-31 22:55:38,896 INFO L277 CfgBuilder]: Performing block encoding [2023-03-31 22:55:38,927 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-03-31 22:55:38,927 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-03-31 22:55:38,929 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 10:55:38 BoogieIcfgContainer [2023-03-31 22:55:38,929 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-03-31 22:55:38,965 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-03-31 22:55:38,965 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-03-31 22:55:38,968 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-03-31 22:55:38,968 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.03 10:55:38" (1/3) ... [2023-03-31 22:55:38,968 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6cb5d09d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 10:55:38, skipping insertion in model container [2023-03-31 22:55:38,969 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:55:38" (2/3) ... [2023-03-31 22:55:38,969 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6cb5d09d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 10:55:38, skipping insertion in model container [2023-03-31 22:55:38,969 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 10:55:38" (3/3) ... [2023-03-31 22:55:38,970 INFO L112 eAbstractionObserver]: Analyzing ICFG sll2n_prepend_equal.i [2023-03-31 22:55:38,981 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-03-31 22:55:38,981 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-03-31 22:55:39,012 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-03-31 22:55:39,017 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;@75274889, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-03-31 22:55:39,017 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-03-31 22:55:39,020 INFO L276 IsEmpty]: Start isEmpty. Operand has 39 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 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) [2023-03-31 22:55:39,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-03-31 22:55:39,025 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:55:39,025 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:55:39,025 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:55:39,029 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:55:39,029 INFO L85 PathProgramCache]: Analyzing trace with hash -22140358, now seen corresponding path program 1 times [2023-03-31 22:55:39,035 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:55:39,035 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [654812369] [2023-03-31 22:55:39,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:55:39,035 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:55:39,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:55:39,323 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 22:55:39,323 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:55:39,323 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [654812369] [2023-03-31 22:55:39,324 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [654812369] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 22:55:39,324 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 22:55:39,324 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-03-31 22:55:39,325 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541513914] [2023-03-31 22:55:39,325 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 22:55:39,328 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-03-31 22:55:39,328 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:55:39,359 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-03-31 22:55:39,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-03-31 22:55:39,362 INFO L87 Difference]: Start difference. First operand has 39 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 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 4.666666666666667) internal successors, (14), 5 states have internal predecessors, (14), 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) [2023-03-31 22:55:39,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:55:39,450 INFO L93 Difference]: Finished difference Result 71 states and 83 transitions. [2023-03-31 22:55:39,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-03-31 22:55:39,452 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 4.666666666666667) internal successors, (14), 5 states have internal predecessors, (14), 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 23 [2023-03-31 22:55:39,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:55:39,471 INFO L225 Difference]: With dead ends: 71 [2023-03-31 22:55:39,471 INFO L226 Difference]: Without dead ends: 30 [2023-03-31 22:55:39,473 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 [2023-03-31 22:55:39,475 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 13 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 22:55:39,475 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 118 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 22:55:39,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-03-31 22:55:39,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2023-03-31 22:55:39,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 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) [2023-03-31 22:55:39,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2023-03-31 22:55:39,508 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 23 [2023-03-31 22:55:39,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:55:39,508 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2023-03-31 22:55:39,508 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 4.666666666666667) internal successors, (14), 5 states have internal predecessors, (14), 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) [2023-03-31 22:55:39,509 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2023-03-31 22:55:39,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-03-31 22:55:39,510 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:55:39,510 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] [2023-03-31 22:55:39,510 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-03-31 22:55:39,510 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:55:39,511 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:55:39,511 INFO L85 PathProgramCache]: Analyzing trace with hash 1194645047, now seen corresponding path program 1 times [2023-03-31 22:55:39,511 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:55:39,511 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1070024943] [2023-03-31 22:55:39,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:55:39,511 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:55:39,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:55:39,714 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-03-31 22:55:39,715 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:55:39,715 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1070024943] [2023-03-31 22:55:39,715 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1070024943] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:55:39,715 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1742047764] [2023-03-31 22:55:39,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:55:39,715 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:55:39,716 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:55:39,718 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) [2023-03-31 22:55:39,719 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-03-31 22:55:39,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:55:39,865 INFO L262 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 5 conjunts are in the unsatisfiable core [2023-03-31 22:55:39,874 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 22:55:39,944 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 22:55:39,944 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 22:55:40,073 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-03-31 22:55:40,076 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1742047764] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 22:55:40,077 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [809728814] [2023-03-31 22:55:40,098 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-03-31 22:55:40,099 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 22:55:40,101 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 22:55:40,105 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 22:55:40,106 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 22:55:40,170 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 23 for LOIs [2023-03-31 22:55:40,562 INFO L197 IcfgInterpreter]: Interpreting procedure sll_prepend with input of size 33 for LOIs [2023-03-31 22:55:40,650 INFO L197 IcfgInterpreter]: Interpreting procedure sll_create with input of size 44 for LOIs [2023-03-31 22:55:40,846 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 11 for LOIs [2023-03-31 22:55:40,854 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 22:55:40,857 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 22:55:46,192 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '386#(and (<= 0 |main_~#s~0.base|) (= main_~data~0 1) (= |main_~#s~0.offset| 0) (= main_~count~0 0) (= main_~ptr~0.base (select (select |#memory_$Pointer$.base| |main_~#s~0.base|) 0)) (= main_~len~0 2) (= main_~temp~2.base (select (select |#memory_$Pointer$.base| main_~ptr~0.base) (+ main_~ptr~0.offset 4))) (not (= (select (select |#memory_int| main_~ptr~0.base) main_~ptr~0.offset) 1)) (= |#NULL.offset| 0) (or (not (= main_~ptr~0.offset 0)) (not (= main_~ptr~0.base 0))) (= (select (select |#memory_$Pointer$.offset| |main_~#s~0.base|) 0) main_~ptr~0.offset) (<= 0 |#StackHeapBarrier|) (= (select (select |#memory_$Pointer$.offset| main_~ptr~0.base) (+ main_~ptr~0.offset 4)) main_~temp~2.offset) (= |#NULL.base| 0))' at error location [2023-03-31 22:55:46,192 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 22:55:46,192 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 22:55:46,193 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-03-31 22:55:46,193 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492330038] [2023-03-31 22:55:46,193 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 22:55:46,194 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-03-31 22:55:46,194 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:55:46,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-03-31 22:55:46,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=1049, Unknown=0, NotChecked=0, Total=1190 [2023-03-31 22:55:46,196 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 12 states, 8 states have (on average 3.75) internal successors, (30), 12 states have internal predecessors, (30), 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) [2023-03-31 22:55:46,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:55:46,281 INFO L93 Difference]: Finished difference Result 50 states and 57 transitions. [2023-03-31 22:55:46,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-03-31 22:55:46,282 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 8 states have (on average 3.75) internal successors, (30), 12 states have internal predecessors, (30), 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 30 [2023-03-31 22:55:46,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:55:46,282 INFO L225 Difference]: With dead ends: 50 [2023-03-31 22:55:46,282 INFO L226 Difference]: Without dead ends: 33 [2023-03-31 22:55:46,283 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 457 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=157, Invalid=1175, Unknown=0, NotChecked=0, Total=1332 [2023-03-31 22:55:46,284 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 11 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 22:55:46,284 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 65 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 22:55:46,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-03-31 22:55:46,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2023-03-31 22:55:46,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 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) [2023-03-31 22:55:46,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2023-03-31 22:55:46,288 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 30 [2023-03-31 22:55:46,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:55:46,289 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2023-03-31 22:55:46,289 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 8 states have (on average 3.75) internal successors, (30), 12 states have internal predecessors, (30), 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) [2023-03-31 22:55:46,289 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2023-03-31 22:55:46,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-03-31 22:55:46,290 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:55:46,290 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] [2023-03-31 22:55:46,298 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-03-31 22:55:46,490 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 [2023-03-31 22:55:46,493 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:55:46,493 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:55:46,493 INFO L85 PathProgramCache]: Analyzing trace with hash -1905187942, now seen corresponding path program 2 times [2023-03-31 22:55:46,494 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:55:46,494 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1915243639] [2023-03-31 22:55:46,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:55:46,494 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:55:46,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:55:47,165 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-03-31 22:55:47,165 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:55:47,165 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1915243639] [2023-03-31 22:55:47,165 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1915243639] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 22:55:47,166 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 22:55:47,166 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2023-03-31 22:55:47,166 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2022858496] [2023-03-31 22:55:47,166 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 22:55:47,166 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-03-31 22:55:47,166 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:55:47,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-03-31 22:55:47,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2023-03-31 22:55:47,167 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand has 11 states, 8 states have (on average 2.375) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2023-03-31 22:55:47,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:55:47,382 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2023-03-31 22:55:47,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-03-31 22:55:47,383 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 8 states have (on average 2.375) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 37 [2023-03-31 22:55:47,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:55:47,383 INFO L225 Difference]: With dead ends: 38 [2023-03-31 22:55:47,383 INFO L226 Difference]: Without dead ends: 36 [2023-03-31 22:55:47,384 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2023-03-31 22:55:47,384 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 30 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 22:55:47,385 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 96 Invalid, 175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 175 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 22:55:47,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-03-31 22:55:47,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 33. [2023-03-31 22:55:47,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 21 states have internal predecessors, (25), 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) [2023-03-31 22:55:47,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2023-03-31 22:55:47,390 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 37 [2023-03-31 22:55:47,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:55:47,390 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2023-03-31 22:55:47,390 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 8 states have (on average 2.375) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2023-03-31 22:55:47,390 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2023-03-31 22:55:47,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-03-31 22:55:47,391 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:55:47,391 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] [2023-03-31 22:55:47,391 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-03-31 22:55:47,392 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:55:47,392 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:55:47,392 INFO L85 PathProgramCache]: Analyzing trace with hash -1905136761, now seen corresponding path program 1 times [2023-03-31 22:55:47,392 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:55:47,392 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [363442387] [2023-03-31 22:55:47,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:55:47,392 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:55:47,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:55:47,601 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-03-31 22:55:47,601 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:55:47,601 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [363442387] [2023-03-31 22:55:47,604 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [363442387] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 22:55:47,604 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 22:55:47,605 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2023-03-31 22:55:47,605 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799760498] [2023-03-31 22:55:47,606 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 22:55:47,606 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-03-31 22:55:47,606 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:55:47,607 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-03-31 22:55:47,607 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2023-03-31 22:55:47,607 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand has 9 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2023-03-31 22:55:47,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:55:47,701 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2023-03-31 22:55:47,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-03-31 22:55:47,701 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 37 [2023-03-31 22:55:47,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:55:47,704 INFO L225 Difference]: With dead ends: 36 [2023-03-31 22:55:47,704 INFO L226 Difference]: Without dead ends: 33 [2023-03-31 22:55:47,704 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2023-03-31 22:55:47,706 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 12 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 22:55:47,708 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 139 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 22:55:47,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-03-31 22:55:47,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2023-03-31 22:55:47,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 21 states have internal predecessors, (24), 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) [2023-03-31 22:55:47,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2023-03-31 22:55:47,720 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 37 [2023-03-31 22:55:47,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:55:47,720 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2023-03-31 22:55:47,720 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2023-03-31 22:55:47,720 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2023-03-31 22:55:47,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-03-31 22:55:47,723 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:55:47,723 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] [2023-03-31 22:55:47,723 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-03-31 22:55:47,723 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:55:47,724 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:55:47,724 INFO L85 PathProgramCache]: Analyzing trace with hash -1229497579, now seen corresponding path program 1 times [2023-03-31 22:55:47,724 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:55:47,724 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1943089059] [2023-03-31 22:55:47,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:55:47,724 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:55:47,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:55:49,344 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 8 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-03-31 22:55:49,344 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:55:49,345 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1943089059] [2023-03-31 22:55:49,345 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1943089059] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:55:49,345 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1050295252] [2023-03-31 22:55:49,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:55:49,345 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:55:49,345 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:55:49,353 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) [2023-03-31 22:55:49,401 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-03-31 22:55:49,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:55:49,547 INFO L262 TraceCheckSpWp]: Trace formula consists of 389 conjuncts, 132 conjunts are in the unsatisfiable core [2023-03-31 22:55:49,553 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 22:55:49,621 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-03-31 22:55:49,641 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-03-31 22:55:49,666 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2023-03-31 22:55:49,803 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 30 treesize of output 18 [2023-03-31 22:55:49,808 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 [2023-03-31 22:55:49,815 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 5 treesize of output 3 [2023-03-31 22:55:49,822 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 [2023-03-31 22:55:50,276 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:55:50,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:55:50,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:55:50,281 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 21 treesize of output 25 [2023-03-31 22:55:50,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:55:50,293 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:55:50,294 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 42 [2023-03-31 22:55:50,298 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:55:50,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:55:50,302 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 24 [2023-03-31 22:55:50,310 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 11 [2023-03-31 22:55:50,317 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 33 [2023-03-31 22:55:50,322 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 12 treesize of output 11 [2023-03-31 22:55:50,328 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 12 treesize of output 11 [2023-03-31 22:55:50,343 INFO L321 Elim1Store]: treesize reduction 4, result has 80.0 percent of original size [2023-03-31 22:55:50,343 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 23 [2023-03-31 22:55:50,504 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-03-31 22:55:50,504 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 76 treesize of output 35 [2023-03-31 22:55:50,511 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:55:50,511 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2023-03-31 22:55:50,645 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 8 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-03-31 22:55:50,645 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 22:55:51,213 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1050295252] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:55:51,213 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1028232888] [2023-03-31 22:55:51,215 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-03-31 22:55:51,215 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 22:55:51,215 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 22:55:51,216 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 22:55:51,216 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 22:55:51,232 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 23 for LOIs [2023-03-31 22:55:51,412 INFO L197 IcfgInterpreter]: Interpreting procedure sll_prepend with input of size 33 for LOIs [2023-03-31 22:55:51,468 INFO L197 IcfgInterpreter]: Interpreting procedure sll_create with input of size 44 for LOIs [2023-03-31 22:55:51,575 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 11 for LOIs [2023-03-31 22:55:51,617 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 22:55:51,620 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 22:55:57,954 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '961#(and (<= 0 |main_~#s~0.base|) (= main_~data~0 1) (= |main_~#s~0.offset| 0) (<= 0 main_~count~0) (= main_~len~0 2) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 22:55:57,954 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 22:55:57,954 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 22:55:57,954 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 34 [2023-03-31 22:55:57,955 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984915088] [2023-03-31 22:55:57,955 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 22:55:57,955 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2023-03-31 22:55:57,955 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:55:57,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2023-03-31 22:55:57,957 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=3230, Unknown=2, NotChecked=0, Total=3422 [2023-03-31 22:55:57,957 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand has 34 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 26 states have internal predecessors, (35), 8 states have call successors, (9), 2 states have call predecessors, (9), 7 states have return successors, (9), 9 states have call predecessors, (9), 8 states have call successors, (9) [2023-03-31 22:55:59,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:55:59,039 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2023-03-31 22:55:59,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-03-31 22:55:59,042 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 26 states have internal predecessors, (35), 8 states have call successors, (9), 2 states have call predecessors, (9), 7 states have return successors, (9), 9 states have call predecessors, (9), 8 states have call successors, (9) Word has length 39 [2023-03-31 22:55:59,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:55:59,043 INFO L225 Difference]: With dead ends: 40 [2023-03-31 22:55:59,043 INFO L226 Difference]: Without dead ends: 38 [2023-03-31 22:55:59,044 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 46 SyntacticMatches, 4 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1092 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=276, Invalid=4552, Unknown=2, NotChecked=0, Total=4830 [2023-03-31 22:55:59,044 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 63 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 644 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 185 SdHoareTripleChecker+Invalid, 651 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 644 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-03-31 22:55:59,045 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 185 Invalid, 651 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 644 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-03-31 22:55:59,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-03-31 22:55:59,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 35. [2023-03-31 22:55:59,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 23 states have (on average 1.173913043478261) internal successors, (27), 23 states have internal predecessors, (27), 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) [2023-03-31 22:55:59,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 40 transitions. [2023-03-31 22:55:59,049 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 40 transitions. Word has length 39 [2023-03-31 22:55:59,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:55:59,049 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 40 transitions. [2023-03-31 22:55:59,049 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 26 states have internal predecessors, (35), 8 states have call successors, (9), 2 states have call predecessors, (9), 7 states have return successors, (9), 9 states have call predecessors, (9), 8 states have call successors, (9) [2023-03-31 22:55:59,049 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 40 transitions. [2023-03-31 22:55:59,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-03-31 22:55:59,050 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:55:59,050 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] [2023-03-31 22:55:59,060 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-03-31 22:55:59,258 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:55:59,258 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:55:59,259 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:55:59,259 INFO L85 PathProgramCache]: Analyzing trace with hash -1229446398, now seen corresponding path program 1 times [2023-03-31 22:55:59,259 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:55:59,259 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [757786471] [2023-03-31 22:55:59,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:55:59,259 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:55:59,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:55:59,917 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-03-31 22:55:59,918 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:55:59,918 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [757786471] [2023-03-31 22:55:59,918 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [757786471] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:55:59,918 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1378656037] [2023-03-31 22:55:59,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:55:59,918 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:55:59,918 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:55:59,919 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) [2023-03-31 22:55:59,972 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-03-31 22:56:00,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:56:00,098 INFO L262 TraceCheckSpWp]: Trace formula consists of 386 conjuncts, 70 conjunts are in the unsatisfiable core [2023-03-31 22:56:00,102 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 22:56:00,200 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 [2023-03-31 22:56:00,361 INFO L321 Elim1Store]: treesize reduction 26, result has 42.2 percent of original size [2023-03-31 22:56:00,361 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 36 treesize of output 74 [2023-03-31 22:56:00,368 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 8 treesize of output 7 [2023-03-31 22:56:00,377 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 8 treesize of output 7 [2023-03-31 22:56:00,410 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 38 treesize of output 11 [2023-03-31 22:56:00,415 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 5 treesize of output 3 [2023-03-31 22:56:00,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:56:00,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:56:00,504 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 25 [2023-03-31 22:56:00,508 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 20 [2023-03-31 22:56:00,513 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 12 treesize of output 11 [2023-03-31 22:56:00,560 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 [2023-03-31 22:56:00,609 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-03-31 22:56:00,610 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 33 treesize of output 16 [2023-03-31 22:56:00,614 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-03-31 22:56:00,615 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 22:56:00,826 WARN L839 $PredicateComparison]: unable to prove that (forall ((v_sll_prepend_~new_head~1.base_12 Int) (v_ArrVal_609 (Array Int Int))) (or (<= |c_#StackHeapBarrier| v_sll_prepend_~new_head~1.base_12) (not (= (select (select (let ((.cse0 (store |c_#memory_$Pointer$.base| v_sll_prepend_~new_head~1.base_12 (store v_ArrVal_609 4 (select (select (store |c_#memory_$Pointer$.base| v_sll_prepend_~new_head~1.base_12 v_ArrVal_609) |c_main_~#s~0.base|) |c_main_~#s~0.offset|))))) (store .cse0 |c_main_~#s~0.base| (store (select .cse0 |c_main_~#s~0.base|) |c_main_~#s~0.offset| v_sll_prepend_~new_head~1.base_12))) v_sll_prepend_~new_head~1.base_12) 4) 0)))) is different from false [2023-03-31 22:56:00,827 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1378656037] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:56:00,827 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1241215744] [2023-03-31 22:56:00,829 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2023-03-31 22:56:00,829 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 22:56:00,829 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 22:56:00,830 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 22:56:00,830 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 22:56:00,856 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 23 for LOIs [2023-03-31 22:56:01,013 INFO L197 IcfgInterpreter]: Interpreting procedure sll_prepend with input of size 33 for LOIs [2023-03-31 22:56:01,083 INFO L197 IcfgInterpreter]: Interpreting procedure sll_create with input of size 44 for LOIs [2023-03-31 22:56:01,248 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 11 for LOIs [2023-03-31 22:56:01,258 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 22:56:01,260 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 22:56:07,426 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1286#(and (= main_~ptr~0.offset 0) (or (and (<= 0 |main_~#s~0.base|) (= main_~data~0 1) (= |main_~#s~0.offset| 0) (= main_~count~0 0) (= main_~len~0 2) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0)) (and (<= 0 |main_~#s~0.base|) (= main_~data~0 1) (<= 1 main_~count~0) (= |main_~#s~0.offset| 0) (= main_~len~0 2) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))) (= main_~ptr~0.base 0) (not (= (+ main_~len~0 1) main_~count~0)))' at error location [2023-03-31 22:56:07,426 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 22:56:07,441 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 22:56:07,441 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 29 [2023-03-31 22:56:07,441 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1187925531] [2023-03-31 22:56:07,441 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 22:56:07,442 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-03-31 22:56:07,442 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:56:07,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-03-31 22:56:07,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=2684, Unknown=2, NotChecked=104, Total=2970 [2023-03-31 22:56:07,443 INFO L87 Difference]: Start difference. First operand 35 states and 40 transitions. Second operand has 29 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 21 states have internal predecessors, (32), 7 states have call successors, (9), 2 states have call predecessors, (9), 7 states have return successors, (9), 8 states have call predecessors, (9), 7 states have call successors, (9) [2023-03-31 22:56:08,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:56:08,074 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2023-03-31 22:56:08,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-03-31 22:56:08,074 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 21 states have internal predecessors, (32), 7 states have call successors, (9), 2 states have call predecessors, (9), 7 states have return successors, (9), 8 states have call predecessors, (9), 7 states have call successors, (9) Word has length 39 [2023-03-31 22:56:08,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:56:08,075 INFO L225 Difference]: With dead ends: 38 [2023-03-31 22:56:08,075 INFO L226 Difference]: Without dead ends: 35 [2023-03-31 22:56:08,076 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 903 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=259, Invalid=3775, Unknown=2, NotChecked=124, Total=4160 [2023-03-31 22:56:08,076 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 44 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 410 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 232 SdHoareTripleChecker+Invalid, 417 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 410 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-03-31 22:56:08,077 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 232 Invalid, 417 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 410 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-03-31 22:56:08,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-03-31 22:56:08,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2023-03-31 22:56:08,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 states have internal predecessors, (26), 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) [2023-03-31 22:56:08,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2023-03-31 22:56:08,081 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 39 [2023-03-31 22:56:08,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:56:08,081 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2023-03-31 22:56:08,081 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 21 states have internal predecessors, (32), 7 states have call successors, (9), 2 states have call predecessors, (9), 7 states have return successors, (9), 8 states have call predecessors, (9), 7 states have call successors, (9) [2023-03-31 22:56:08,081 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2023-03-31 22:56:08,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-03-31 22:56:08,082 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:56:08,082 INFO L195 NwaCegarLoop]: trace histogram [3, 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] [2023-03-31 22:56:08,088 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-03-31 22:56:08,288 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:56:08,288 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:56:08,289 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:56:08,289 INFO L85 PathProgramCache]: Analyzing trace with hash -431120432, now seen corresponding path program 2 times [2023-03-31 22:56:08,289 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:56:08,289 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1424715270] [2023-03-31 22:56:08,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:56:08,289 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:56:08,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:56:11,714 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 3 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 22:56:11,714 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:56:11,714 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1424715270] [2023-03-31 22:56:11,714 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1424715270] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:56:11,714 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1740401361] [2023-03-31 22:56:11,714 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 22:56:11,715 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:56:11,715 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:56:11,716 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) [2023-03-31 22:56:11,718 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-03-31 22:56:11,946 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-03-31 22:56:11,946 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 22:56:11,950 INFO L262 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 186 conjunts are in the unsatisfiable core [2023-03-31 22:56:11,955 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 22:56:11,962 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-03-31 22:56:12,018 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 5 treesize of output 3 [2023-03-31 22:56:12,096 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-03-31 22:56:12,208 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2023-03-31 22:56:12,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:56:12,449 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2023-03-31 22:56:12,542 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-03-31 22:56:12,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:56:12,549 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2023-03-31 22:56:12,563 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-03-31 22:56:12,784 INFO L321 Elim1Store]: treesize reduction 84, result has 24.3 percent of original size [2023-03-31 22:56:12,784 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 41 treesize of output 49 [2023-03-31 22:56:13,042 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-03-31 22:56:13,042 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 85 treesize of output 40 [2023-03-31 22:56:13,049 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 7 [2023-03-31 22:56:13,055 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 0 case distinctions, treesize of input 16 treesize of output 10 [2023-03-31 22:56:13,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:56:13,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:56:13,757 INFO L321 Elim1Store]: treesize reduction 47, result has 9.6 percent of original size [2023-03-31 22:56:13,758 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 106 treesize of output 81 [2023-03-31 22:56:13,781 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:56:13,783 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:56:13,784 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 5 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 27 [2023-03-31 22:56:13,789 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:56:13,793 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:56:13,794 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:56:13,795 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 0 case distinctions, treesize of input 38 treesize of output 36 [2023-03-31 22:56:13,801 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 87 treesize of output 68 [2023-03-31 22:56:13,804 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 12 treesize of output 11 [2023-03-31 22:56:13,811 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 12 treesize of output 11 [2023-03-31 22:56:13,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:56:13,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:56:13,830 INFO L321 Elim1Store]: treesize reduction 4, result has 83.3 percent of original size [2023-03-31 22:56:13,830 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 33 [2023-03-31 22:56:13,839 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 11 [2023-03-31 22:56:14,536 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-03-31 22:56:14,537 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 142 treesize of output 56 [2023-03-31 22:56:14,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:56:14,544 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 10 [2023-03-31 22:56:14,751 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 3 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 22:56:14,751 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 22:56:15,510 WARN L839 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_810 (Array Int Int)) (v_sll_prepend_~new_head~1.base_15 Int) (v_ArrVal_807 (Array Int Int)) (v_ArrVal_806 (Array Int Int)) (v_ArrVal_809 (Array Int Int)) (v_ArrVal_808 (Array Int Int))) (or (not (= (select |c_#valid| v_sll_prepend_~new_head~1.base_15) 0)) (= c_main_~data~0 (let ((.cse3 (let ((.cse4 (store |c_#memory_$Pointer$.offset| v_sll_prepend_~new_head~1.base_15 (store v_ArrVal_808 4 (select (select (store |c_#memory_$Pointer$.offset| v_sll_prepend_~new_head~1.base_15 v_ArrVal_808) |c_main_~#s~0.base|) |c_main_~#s~0.offset|))))) (store .cse4 |c_main_~#s~0.base| (store (select .cse4 |c_main_~#s~0.base|) |c_main_~#s~0.offset| 0)))) (.cse0 (store (store |c_#memory_$Pointer$.base| v_sll_prepend_~new_head~1.base_15 (store v_ArrVal_806 4 (select (select (store |c_#memory_$Pointer$.base| v_sll_prepend_~new_head~1.base_15 v_ArrVal_806) |c_main_~#s~0.base|) |c_main_~#s~0.offset|))) |c_main_~#s~0.base| (store (select (store |c_#memory_$Pointer$.base| v_sll_prepend_~new_head~1.base_15 v_ArrVal_810) |c_main_~#s~0.base|) |c_main_~#s~0.offset| v_sll_prepend_~new_head~1.base_15)))) (let ((.cse1 (select (select .cse0 v_sll_prepend_~new_head~1.base_15) 4)) (.cse2 (+ 4 (select (select .cse3 v_sll_prepend_~new_head~1.base_15) 4)))) (select (select (store (store |c_#memory_int| v_sll_prepend_~new_head~1.base_15 v_ArrVal_807) |c_main_~#s~0.base| v_ArrVal_809) (select (select .cse0 .cse1) .cse2)) (select (select .cse3 .cse1) .cse2))))) (<= |c_#StackHeapBarrier| v_sll_prepend_~new_head~1.base_15))) is different from false [2023-03-31 22:56:15,513 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1740401361] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:56:15,513 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [439709108] [2023-03-31 22:56:15,525 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-03-31 22:56:15,525 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 22:56:15,526 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 22:56:15,526 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 22:56:15,526 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 22:56:15,540 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 23 for LOIs [2023-03-31 22:56:15,699 INFO L197 IcfgInterpreter]: Interpreting procedure sll_prepend with input of size 33 for LOIs [2023-03-31 22:56:15,760 INFO L197 IcfgInterpreter]: Interpreting procedure sll_create with input of size 44 for LOIs [2023-03-31 22:56:15,885 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 11 for LOIs [2023-03-31 22:56:15,894 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 22:56:15,896 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 22:56:23,361 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1647#(and (<= 0 |main_~#s~0.base|) (= main_~data~0 1) (= |main_~#s~0.offset| 0) (<= 0 main_~count~0) (= main_~len~0 2) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 22:56:23,362 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 22:56:23,362 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 22:56:23,362 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 52 [2023-03-31 22:56:23,362 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1027470246] [2023-03-31 22:56:23,362 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 22:56:23,362 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2023-03-31 22:56:23,363 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:56:23,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2023-03-31 22:56:23,364 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=5921, Unknown=5, NotChecked=154, Total=6320 [2023-03-31 22:56:23,364 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 52 states, 37 states have (on average 1.3243243243243243) internal successors, (49), 39 states have internal predecessors, (49), 9 states have call successors, (10), 4 states have call predecessors, (10), 11 states have return successors, (11), 11 states have call predecessors, (11), 9 states have call successors, (11) [2023-03-31 22:56:26,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:56:26,941 INFO L93 Difference]: Finished difference Result 64 states and 71 transitions. [2023-03-31 22:56:26,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-03-31 22:56:26,942 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 37 states have (on average 1.3243243243243243) internal successors, (49), 39 states have internal predecessors, (49), 9 states have call successors, (10), 4 states have call predecessors, (10), 11 states have return successors, (11), 11 states have call predecessors, (11), 9 states have call successors, (11) Word has length 41 [2023-03-31 22:56:26,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:56:26,943 INFO L225 Difference]: With dead ends: 64 [2023-03-31 22:56:26,943 INFO L226 Difference]: Without dead ends: 62 [2023-03-31 22:56:26,945 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 40 SyntacticMatches, 4 SemanticMatches, 93 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1816 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=368, Invalid=8373, Unknown=5, NotChecked=184, Total=8930 [2023-03-31 22:56:26,945 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 49 mSDsluCounter, 297 mSDsCounter, 0 mSdLazyCounter, 1320 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 313 SdHoareTripleChecker+Invalid, 1345 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 1320 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2023-03-31 22:56:26,945 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 313 Invalid, 1345 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 1320 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2023-03-31 22:56:26,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2023-03-31 22:56:26,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 47. [2023-03-31 22:56:26,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 32 states have (on average 1.15625) internal successors, (37), 32 states have internal predecessors, (37), 9 states have call successors, (9), 5 states have call predecessors, (9), 5 states have return successors, (9), 9 states have call predecessors, (9), 8 states have call successors, (9) [2023-03-31 22:56:26,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2023-03-31 22:56:26,958 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 41 [2023-03-31 22:56:26,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:56:26,958 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2023-03-31 22:56:26,959 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 37 states have (on average 1.3243243243243243) internal successors, (49), 39 states have internal predecessors, (49), 9 states have call successors, (10), 4 states have call predecessors, (10), 11 states have return successors, (11), 11 states have call predecessors, (11), 9 states have call successors, (11) [2023-03-31 22:56:26,959 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2023-03-31 22:56:26,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-03-31 22:56:26,960 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:56:26,961 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:56:26,967 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-03-31 22:56:27,167 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:56:27,167 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:56:27,168 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:56:27,168 INFO L85 PathProgramCache]: Analyzing trace with hash -431069251, now seen corresponding path program 2 times [2023-03-31 22:56:27,168 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:56:27,168 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922185661] [2023-03-31 22:56:27,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:56:27,168 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:56:27,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:56:28,884 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 5 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-03-31 22:56:28,884 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:56:28,885 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922185661] [2023-03-31 22:56:28,885 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [922185661] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:56:28,885 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1694084331] [2023-03-31 22:56:28,885 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 22:56:28,885 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:56:28,885 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:56:28,886 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 22:56:28,888 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-03-31 22:56:29,100 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-03-31 22:56:29,100 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 22:56:29,103 INFO L262 TraceCheckSpWp]: Trace formula consists of 401 conjuncts, 122 conjunts are in the unsatisfiable core [2023-03-31 22:56:29,107 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 22:56:29,138 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-03-31 22:56:29,188 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-03-31 22:56:29,394 INFO L321 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2023-03-31 22:56:29,394 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 31 treesize of output 18 [2023-03-31 22:56:29,398 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 5 treesize of output 3 [2023-03-31 22:56:29,403 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 [2023-03-31 22:56:29,826 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:56:29,832 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:56:29,833 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 24 [2023-03-31 22:56:29,837 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:56:29,839 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:56:29,852 INFO L321 Elim1Store]: treesize reduction 47, result has 9.6 percent of original size [2023-03-31 22:56:29,852 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 52 treesize of output 49 [2023-03-31 22:56:29,858 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 34 [2023-03-31 22:56:29,864 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 12 treesize of output 11 [2023-03-31 22:56:29,876 INFO L321 Elim1Store]: treesize reduction 4, result has 80.0 percent of original size [2023-03-31 22:56:29,877 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 23 [2023-03-31 22:56:29,886 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 12 treesize of output 11 [2023-03-31 22:56:29,893 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 11 [2023-03-31 22:56:30,069 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:56:30,070 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2023-03-31 22:56:30,260 INFO L321 Elim1Store]: treesize reduction 32, result has 3.0 percent of original size [2023-03-31 22:56:30,260 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 70 treesize of output 28 [2023-03-31 22:56:30,264 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 5 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-03-31 22:56:30,264 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 22:56:30,827 WARN L839 $PredicateComparison]: unable to prove that (forall ((v_sll_prepend_~new_head~1.base_18 Int) (v_ArrVal_982 (Array Int Int)) (v_ArrVal_981 (Array Int Int)) (v_ArrVal_983 (Array Int Int))) (or (not (= (select |c_#valid| v_sll_prepend_~new_head~1.base_18) 0)) (<= |c_#StackHeapBarrier| v_sll_prepend_~new_head~1.base_18) (not (= (select (let ((.cse0 (let ((.cse1 (store |c_#memory_$Pointer$.base| v_sll_prepend_~new_head~1.base_18 (store v_ArrVal_982 4 (select (select (store |c_#memory_$Pointer$.base| v_sll_prepend_~new_head~1.base_18 v_ArrVal_982) |c_main_~#s~0.base|) |c_main_~#s~0.offset|))))) (store .cse1 |c_main_~#s~0.base| (store (select .cse1 |c_main_~#s~0.base|) |c_main_~#s~0.offset| v_sll_prepend_~new_head~1.base_18))))) (select .cse0 (select (select .cse0 v_sll_prepend_~new_head~1.base_18) 4))) (+ (select (select (store (store |c_#memory_$Pointer$.offset| v_sll_prepend_~new_head~1.base_18 (store v_ArrVal_983 4 (select (select (store |c_#memory_$Pointer$.offset| v_sll_prepend_~new_head~1.base_18 v_ArrVal_983) |c_main_~#s~0.base|) |c_main_~#s~0.offset|))) |c_main_~#s~0.base| (store (select (store |c_#memory_$Pointer$.offset| v_sll_prepend_~new_head~1.base_18 v_ArrVal_981) |c_main_~#s~0.base|) |c_main_~#s~0.offset| 0)) v_sll_prepend_~new_head~1.base_18) 4) 4)) 0)))) is different from false [2023-03-31 22:56:30,829 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1694084331] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:56:30,830 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [371317820] [2023-03-31 22:56:30,831 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2023-03-31 22:56:30,831 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 22:56:30,831 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 22:56:30,831 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 22:56:30,832 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 22:56:30,843 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 23 for LOIs [2023-03-31 22:56:30,982 INFO L197 IcfgInterpreter]: Interpreting procedure sll_prepend with input of size 33 for LOIs [2023-03-31 22:56:31,035 INFO L197 IcfgInterpreter]: Interpreting procedure sll_create with input of size 44 for LOIs [2023-03-31 22:56:31,136 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 11 for LOIs [2023-03-31 22:56:31,144 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 22:56:31,146 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 22:56:38,959 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2054#(and (= main_~ptr~0.offset 0) (or (and (<= 0 |main_~#s~0.base|) (= main_~data~0 1) (= |main_~#s~0.offset| 0) (= main_~count~0 0) (= main_~len~0 2) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0)) (and (<= 0 |main_~#s~0.base|) (= main_~data~0 1) (<= 1 main_~count~0) (= |main_~#s~0.offset| 0) (= main_~len~0 2) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))) (= main_~ptr~0.base 0) (not (= (+ main_~len~0 1) main_~count~0)))' at error location [2023-03-31 22:56:38,960 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 22:56:38,960 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 22:56:38,960 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 36 [2023-03-31 22:56:38,960 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29408500] [2023-03-31 22:56:38,960 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 22:56:38,960 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-03-31 22:56:38,960 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:56:38,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-03-31 22:56:38,962 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=3710, Unknown=2, NotChecked=122, Total=4032 [2023-03-31 22:56:38,962 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand has 36 states, 24 states have (on average 1.5) internal successors, (36), 27 states have internal predecessors, (36), 7 states have call successors, (9), 2 states have call predecessors, (9), 8 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) [2023-03-31 22:56:41,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:56:41,459 INFO L93 Difference]: Finished difference Result 57 states and 64 transitions. [2023-03-31 22:56:41,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-03-31 22:56:41,459 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 24 states have (on average 1.5) internal successors, (36), 27 states have internal predecessors, (36), 7 states have call successors, (9), 2 states have call predecessors, (9), 8 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) Word has length 41 [2023-03-31 22:56:41,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:56:41,460 INFO L225 Difference]: With dead ends: 57 [2023-03-31 22:56:41,460 INFO L226 Difference]: Without dead ends: 54 [2023-03-31 22:56:41,461 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 51 SyntacticMatches, 5 SemanticMatches, 76 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1186 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=317, Invalid=5537, Unknown=2, NotChecked=150, Total=6006 [2023-03-31 22:56:41,462 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 45 mSDsluCounter, 383 mSDsCounter, 0 mSdLazyCounter, 785 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 404 SdHoareTripleChecker+Invalid, 794 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 785 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2023-03-31 22:56:41,462 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 404 Invalid, 794 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 785 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2023-03-31 22:56:41,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2023-03-31 22:56:41,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 49. [2023-03-31 22:56:41,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 34 states have (on average 1.1176470588235294) internal successors, (38), 34 states have internal predecessors, (38), 9 states have call successors, (9), 5 states have call predecessors, (9), 5 states have return successors, (9), 9 states have call predecessors, (9), 8 states have call successors, (9) [2023-03-31 22:56:41,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 56 transitions. [2023-03-31 22:56:41,474 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 56 transitions. Word has length 41 [2023-03-31 22:56:41,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:56:41,474 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 56 transitions. [2023-03-31 22:56:41,474 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 24 states have (on average 1.5) internal successors, (36), 27 states have internal predecessors, (36), 7 states have call successors, (9), 2 states have call predecessors, (9), 8 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) [2023-03-31 22:56:41,474 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 56 transitions. [2023-03-31 22:56:41,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-03-31 22:56:41,475 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:56:41,475 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 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] [2023-03-31 22:56:41,481 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-03-31 22:56:41,681 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:56:41,681 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:56:41,681 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:56:41,681 INFO L85 PathProgramCache]: Analyzing trace with hash -1989828149, now seen corresponding path program 3 times [2023-03-31 22:56:41,681 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:56:41,682 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1396679019] [2023-03-31 22:56:41,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:56:41,682 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:56:41,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat