/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain EqDomain -i ../sv-benchmarks/c/list-simple/sll2n_prepend_equal.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 10:59:12,425 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 10:59:12,427 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 10:59:12,463 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 10:59:12,463 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 10:59:12,465 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 10:59:12,468 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 10:59:12,470 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 10:59:12,470 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 10:59:12,475 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 10:59:12,475 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 10:59:12,476 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 10:59:12,476 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 10:59:12,476 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 10:59:12,477 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 10:59:12,477 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 10:59:12,478 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 10:59:12,479 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 10:59:12,481 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 10:59:12,485 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 10:59:12,486 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 10:59:12,488 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 10:59:12,489 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 10:59:12,490 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 10:59:12,493 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 10:59:12,493 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 10:59:12,493 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 10:59:12,494 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 10:59:12,494 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 10:59:12,495 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 10:59:12,495 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 10:59:12,495 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 10:59:12,496 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 10:59:12,497 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 10:59:12,497 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 10:59:12,497 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 10:59:12,498 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 10:59:12,498 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 10:59:12,498 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 10:59:12,498 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 10:59:12,499 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 10:59:12,500 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-01 10:59:12,524 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 10:59:12,524 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 10:59:12,524 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 10:59:12,525 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 10:59:12,525 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 10:59:12,525 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 10:59:12,525 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 10:59:12,525 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 10:59:12,525 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 10:59:12,526 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 10:59:12,526 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 10:59:12,526 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 10:59:12,526 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 10:59:12,526 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 10:59:12,526 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 10:59:12,527 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 10:59:12,527 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 10:59:12,527 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 10:59:12,527 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 10:59:12,527 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 10:59:12,527 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 10:59:12,527 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 10:59:12,527 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 10:59:12,527 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 10:59:12,528 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 10:59:12,528 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 10:59:12,528 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 10:59:12,528 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 10:59:12,528 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 10:59:12,528 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 10:59:12,528 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 10:59:12,529 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 10:59:12,529 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 10:59:12,529 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 10:59:12,529 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 10:59:12,529 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 10:59:12,529 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 10:59:12,529 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 10:59:12,529 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 10:59:12,529 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 10:59:12,529 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 10:59:12,529 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> EqDomain [2023-04-01 10:59:12,700 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 10:59:12,716 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 10:59:12,718 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 10:59:12,718 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 10:59:12,719 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 10:59:12,720 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/list-simple/sll2n_prepend_equal.i [2023-04-01 10:59:13,743 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 10:59:13,873 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 10:59:13,873 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-simple/sll2n_prepend_equal.i [2023-04-01 10:59:13,880 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fd07631de/ea4419d255b24bf7bad98cea54e701af/FLAG8554ac331 [2023-04-01 10:59:13,889 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fd07631de/ea4419d255b24bf7bad98cea54e701af [2023-04-01 10:59:13,890 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 10:59:13,891 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 10:59:13,893 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 10:59:13,893 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 10:59:13,896 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 10:59:13,896 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 10:59:13" (1/1) ... [2023-04-01 10:59:13,897 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@11b0b17b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:59:13, skipping insertion in model container [2023-04-01 10:59:13,897 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 10:59:13" (1/1) ... [2023-04-01 10:59:13,901 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 10:59:13,927 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 10:59:14,085 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] [2023-04-01 10:59:14,088 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 10:59:14,093 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 10:59:14,117 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] [2023-04-01 10:59:14,117 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 10:59:14,136 INFO L208 MainTranslator]: Completed translation [2023-04-01 10:59:14,136 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:59:14 WrapperNode [2023-04-01 10:59:14,136 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 10:59:14,137 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 10:59:14,137 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 10:59:14,137 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 10:59:14,144 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:59:14" (1/1) ... [2023-04-01 10:59:14,144 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:59:14" (1/1) ... [2023-04-01 10:59:14,164 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:59:14" (1/1) ... [2023-04-01 10:59:14,165 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:59:14" (1/1) ... [2023-04-01 10:59:14,177 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:59:14" (1/1) ... [2023-04-01 10:59:14,187 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:59:14" (1/1) ... [2023-04-01 10:59:14,191 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:59:14" (1/1) ... [2023-04-01 10:59:14,192 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:59:14" (1/1) ... [2023-04-01 10:59:14,195 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 10:59:14,196 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 10:59:14,196 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 10:59:14,196 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 10:59:14,196 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:59:14" (1/1) ... [2023-04-01 10:59:14,205 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 10:59:14,212 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 10:59:14,242 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-01 10:59:14,258 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-01 10:59:14,274 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 10:59:14,274 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 10:59:14,274 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 10:59:14,275 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2023-04-01 10:59:14,275 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2023-04-01 10:59:14,275 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2023-04-01 10:59:14,275 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-04-01 10:59:14,275 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_create [2023-04-01 10:59:14,275 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_destroy [2023-04-01 10:59:14,275 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_prepend [2023-04-01 10:59:14,275 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 10:59:14,275 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 10:59:14,275 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 10:59:14,275 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-04-01 10:59:14,275 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-04-01 10:59:14,276 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 10:59:14,276 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 10:59:14,276 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2023-04-01 10:59:14,276 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2023-04-01 10:59:14,276 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2023-04-01 10:59:14,276 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2023-04-01 10:59:14,276 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2023-04-01 10:59:14,276 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2023-04-01 10:59:14,276 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2023-04-01 10:59:14,276 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2023-04-01 10:59:14,276 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2023-04-01 10:59:14,276 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2023-04-01 10:59:14,277 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2023-04-01 10:59:14,277 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2023-04-01 10:59:14,277 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2023-04-01 10:59:14,277 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2023-04-01 10:59:14,277 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2023-04-01 10:59:14,277 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2023-04-01 10:59:14,277 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2023-04-01 10:59:14,277 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2023-04-01 10:59:14,277 INFO L130 BoogieDeclarations]: Found specification of procedure select [2023-04-01 10:59:14,277 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2023-04-01 10:59:14,277 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2023-04-01 10:59:14,277 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2023-04-01 10:59:14,277 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2023-04-01 10:59:14,278 INFO L130 BoogieDeclarations]: Found specification of procedure random [2023-04-01 10:59:14,278 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2023-04-01 10:59:14,278 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2023-04-01 10:59:14,278 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2023-04-01 10:59:14,278 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2023-04-01 10:59:14,278 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2023-04-01 10:59:14,278 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2023-04-01 10:59:14,278 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2023-04-01 10:59:14,278 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2023-04-01 10:59:14,278 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2023-04-01 10:59:14,278 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2023-04-01 10:59:14,278 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2023-04-01 10:59:14,278 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2023-04-01 10:59:14,279 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2023-04-01 10:59:14,279 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2023-04-01 10:59:14,279 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2023-04-01 10:59:14,279 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2023-04-01 10:59:14,279 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2023-04-01 10:59:14,279 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2023-04-01 10:59:14,279 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2023-04-01 10:59:14,279 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2023-04-01 10:59:14,279 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2023-04-01 10:59:14,279 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2023-04-01 10:59:14,279 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2023-04-01 10:59:14,279 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2023-04-01 10:59:14,279 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2023-04-01 10:59:14,280 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2023-04-01 10:59:14,280 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2023-04-01 10:59:14,280 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2023-04-01 10:59:14,280 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2023-04-01 10:59:14,280 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2023-04-01 10:59:14,280 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2023-04-01 10:59:14,280 INFO L130 BoogieDeclarations]: Found specification of procedure free [2023-04-01 10:59:14,280 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2023-04-01 10:59:14,280 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2023-04-01 10:59:14,280 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2023-04-01 10:59:14,280 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2023-04-01 10:59:14,280 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2023-04-01 10:59:14,280 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2023-04-01 10:59:14,281 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2023-04-01 10:59:14,281 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2023-04-01 10:59:14,281 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2023-04-01 10:59:14,281 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2023-04-01 10:59:14,281 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2023-04-01 10:59:14,281 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2023-04-01 10:59:14,281 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2023-04-01 10:59:14,281 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2023-04-01 10:59:14,281 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2023-04-01 10:59:14,281 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2023-04-01 10:59:14,281 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2023-04-01 10:59:14,281 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2023-04-01 10:59:14,281 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2023-04-01 10:59:14,281 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2023-04-01 10:59:14,282 INFO L130 BoogieDeclarations]: Found specification of procedure system [2023-04-01 10:59:14,282 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2023-04-01 10:59:14,282 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2023-04-01 10:59:14,282 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2023-04-01 10:59:14,282 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2023-04-01 10:59:14,282 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2023-04-01 10:59:14,282 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2023-04-01 10:59:14,282 INFO L130 BoogieDeclarations]: Found specification of procedure div [2023-04-01 10:59:14,282 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2023-04-01 10:59:14,282 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2023-04-01 10:59:14,282 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2023-04-01 10:59:14,282 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2023-04-01 10:59:14,282 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2023-04-01 10:59:14,282 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2023-04-01 10:59:14,283 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2023-04-01 10:59:14,283 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2023-04-01 10:59:14,283 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2023-04-01 10:59:14,283 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2023-04-01 10:59:14,283 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2023-04-01 10:59:14,283 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2023-04-01 10:59:14,283 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2023-04-01 10:59:14,283 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2023-04-01 10:59:14,283 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2023-04-01 10:59:14,283 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2023-04-01 10:59:14,283 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2023-04-01 10:59:14,283 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2023-04-01 10:59:14,283 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2023-04-01 10:59:14,284 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2023-04-01 10:59:14,284 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2023-04-01 10:59:14,284 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-04-01 10:59:14,284 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-04-01 10:59:14,284 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-04-01 10:59:14,284 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 10:59:14,284 INFO L130 BoogieDeclarations]: Found specification of procedure sll_create [2023-04-01 10:59:14,284 INFO L130 BoogieDeclarations]: Found specification of procedure sll_destroy [2023-04-01 10:59:14,284 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-04-01 10:59:14,284 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 10:59:14,284 INFO L130 BoogieDeclarations]: Found specification of procedure sll_prepend [2023-04-01 10:59:14,284 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 10:59:14,284 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-01 10:59:14,285 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-04-01 10:59:14,285 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 10:59:14,285 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 10:59:14,285 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 10:59:14,285 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 10:59:14,439 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 10:59:14,440 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 10:59:14,473 INFO L771 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2023-04-01 10:59:14,593 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 10:59:14,661 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 10:59:14,661 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-04-01 10:59:14,690 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 10:59:14 BoogieIcfgContainer [2023-04-01 10:59:14,690 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 10:59:14,692 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 10:59:14,692 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 10:59:14,694 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 10:59:14,694 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 10:59:13" (1/3) ... [2023-04-01 10:59:14,695 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@78678ce3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 10:59:14, skipping insertion in model container [2023-04-01 10:59:14,695 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:59:14" (2/3) ... [2023-04-01 10:59:14,695 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@78678ce3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 10:59:14, skipping insertion in model container [2023-04-01 10:59:14,695 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 10:59:14" (3/3) ... [2023-04-01 10:59:14,696 INFO L112 eAbstractionObserver]: Analyzing ICFG sll2n_prepend_equal.i [2023-04-01 10:59:14,709 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 10:59:14,709 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 10:59:14,761 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 10:59:14,767 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;@33401c05, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 10:59:14,768 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 10:59:14,770 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) [2023-04-01 10:59:14,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-04-01 10:59:14,776 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 10:59:14,776 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 10:59:14,777 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 10:59:14,782 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 10:59:14,783 INFO L85 PathProgramCache]: Analyzing trace with hash -22140358, now seen corresponding path program 1 times [2023-04-01 10:59:14,789 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 10:59:14,789 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1627177946] [2023-04-01 10:59:14,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 10:59:14,790 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 10:59:14,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:59:15,069 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 10:59:15,070 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 10:59:15,070 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1627177946] [2023-04-01 10:59:15,070 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1627177946] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 10:59:15,070 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 10:59:15,070 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-01 10:59:15,071 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1533340767] [2023-04-01 10:59:15,072 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 10:59:15,074 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-01 10:59:15,074 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 10:59:15,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-01 10:59:15,098 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-01 10:59:15,100 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) [2023-04-01 10:59:15,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 10:59:15,170 INFO L93 Difference]: Finished difference Result 71 states and 83 transitions. [2023-04-01 10:59:15,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-04-01 10:59:15,172 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 [2023-04-01 10:59:15,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 10:59:15,176 INFO L225 Difference]: With dead ends: 71 [2023-04-01 10:59:15,176 INFO L226 Difference]: Without dead ends: 30 [2023-04-01 10:59:15,178 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-04-01 10:59:15,181 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 [2023-04-01 10:59:15,182 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] [2023-04-01 10:59:15,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-04-01 10:59:15,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2023-04-01 10:59:15,213 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) [2023-04-01 10:59:15,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2023-04-01 10:59:15,216 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 23 [2023-04-01 10:59:15,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 10:59:15,217 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2023-04-01 10:59:15,217 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) [2023-04-01 10:59:15,217 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2023-04-01 10:59:15,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-04-01 10:59:15,218 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 10:59:15,219 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] [2023-04-01 10:59:15,219 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 10:59:15,219 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 10:59:15,220 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 10:59:15,220 INFO L85 PathProgramCache]: Analyzing trace with hash 1194645047, now seen corresponding path program 1 times [2023-04-01 10:59:15,220 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 10:59:15,220 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [385563306] [2023-04-01 10:59:15,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 10:59:15,221 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 10:59:15,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:59:15,358 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 10:59:15,358 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 10:59:15,359 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [385563306] [2023-04-01 10:59:15,359 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [385563306] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 10:59:15,359 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [621490317] [2023-04-01 10:59:15,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 10:59:15,359 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 10:59:15,359 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 10:59:15,362 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 10:59:15,400 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-01 10:59:15,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:59:15,517 INFO L262 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 5 conjunts are in the unsatisfiable core [2023-04-01 10:59:15,521 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 10:59:15,570 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 10:59:15,571 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 10:59:15,654 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 10:59:15,654 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [621490317] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 10:59:15,654 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1691190672] [2023-04-01 10:59:15,687 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-01 10:59:15,687 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 10:59:15,689 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 10:59:15,692 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 10:59:15,692 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 10:59:15,777 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 49 for LOIs [2023-04-01 10:59:16,373 INFO L197 IcfgInterpreter]: Interpreting procedure sll_prepend with input of size 72 for LOIs [2023-04-01 10:59:16,479 INFO L197 IcfgInterpreter]: Interpreting procedure sll_create with input of size 68 for LOIs [2023-04-01 10:59:16,790 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 27 for LOIs [2023-04-01 10:59:16,798 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 10:59:16,825 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 10:59:22,975 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '386#(and (= main_~data~0 1) (= (select |old(#valid)| |main_~#s~0.base|) 0) (= |main_~#s~0.offset| 0) (= main_~count~0 0) (= (select |old(#valid)| 1) 1) (= (select |old(#length)| 1) 2) (= (select |old(#valid)| 0) 0) (= main_~ptr~0.base (select (select |#memory_$Pointer$.base| |main_~#s~0.base|) 0)) (not (= |#StackHeapBarrier| 0)) (= main_~len~0 2) (= main_~temp~2.base (select (select |#memory_$Pointer$.base| main_~ptr~0.base) (+ main_~ptr~0.offset 4))) (not (= (select (select |#memory_int| main_~ptr~0.base) main_~ptr~0.offset) 1)) (= (select (select |old(#memory_int)| 1) 0) 48) (= 22 (select |old(#length)| 2)) (not (= |main_~#s~0.base| 0)) (= |#NULL.offset| 0) (or (not (= main_~ptr~0.offset 0)) (not (= main_~ptr~0.base 0))) (= (select (select |old(#memory_int)| 1) 1) 0) (= (select (select |#memory_$Pointer$.offset| |main_~#s~0.base|) 0) main_~ptr~0.offset) (= (select |old(#valid)| 2) 1) (= (select (select |#memory_$Pointer$.offset| main_~ptr~0.base) (+ main_~ptr~0.offset 4)) main_~temp~2.offset) (not (= |main_~#s~0.base| |#StackHeapBarrier|)) (= |#NULL.base| 0))' at error location [2023-04-01 10:59:22,975 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 10:59:22,975 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 10:59:22,976 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-04-01 10:59:22,976 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [116521242] [2023-04-01 10:59:22,976 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 10:59:22,977 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-04-01 10:59:22,977 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 10:59:22,977 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-04-01 10:59:22,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1071, Unknown=0, NotChecked=0, Total=1190 [2023-04-01 10:59:22,979 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) [2023-04-01 10:59:23,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 10:59:23,071 INFO L93 Difference]: Finished difference Result 50 states and 57 transitions. [2023-04-01 10:59:23,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-01 10:59:23,072 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 [2023-04-01 10:59:23,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 10:59:23,072 INFO L225 Difference]: With dead ends: 50 [2023-04-01 10:59:23,073 INFO L226 Difference]: Without dead ends: 33 [2023-04-01 10:59:23,073 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 439 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=135, Invalid=1197, Unknown=0, NotChecked=0, Total=1332 [2023-04-01 10:59:23,074 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 [2023-04-01 10:59:23,074 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] [2023-04-01 10:59:23,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-04-01 10:59:23,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2023-04-01 10:59:23,077 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) [2023-04-01 10:59:23,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2023-04-01 10:59:23,078 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 30 [2023-04-01 10:59:23,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 10:59:23,078 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2023-04-01 10:59:23,078 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) [2023-04-01 10:59:23,078 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2023-04-01 10:59:23,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-04-01 10:59:23,079 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 10:59:23,079 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] [2023-04-01 10:59:23,085 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-01 10:59:23,285 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 10:59:23,288 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 10:59:23,288 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 10:59:23,288 INFO L85 PathProgramCache]: Analyzing trace with hash -1905187942, now seen corresponding path program 2 times [2023-04-01 10:59:23,288 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 10:59:23,288 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1266464084] [2023-04-01 10:59:23,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 10:59:23,289 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 10:59:23,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:59:24,110 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-04-01 10:59:24,110 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 10:59:24,110 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1266464084] [2023-04-01 10:59:24,110 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1266464084] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 10:59:24,110 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 10:59:24,110 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2023-04-01 10:59:24,110 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [345114171] [2023-04-01 10:59:24,111 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 10:59:24,111 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-04-01 10:59:24,111 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 10:59:24,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-04-01 10:59:24,111 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2023-04-01 10:59:24,112 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) [2023-04-01 10:59:24,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 10:59:24,341 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2023-04-01 10:59:24,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-04-01 10:59:24,342 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 [2023-04-01 10:59:24,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 10:59:24,342 INFO L225 Difference]: With dead ends: 38 [2023-04-01 10:59:24,342 INFO L226 Difference]: Without dead ends: 36 [2023-04-01 10:59:24,343 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2023-04-01 10:59:24,343 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 [2023-04-01 10:59:24,344 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] [2023-04-01 10:59:24,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-04-01 10:59:24,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 33. [2023-04-01 10:59:24,349 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) [2023-04-01 10:59:24,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2023-04-01 10:59:24,350 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 37 [2023-04-01 10:59:24,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 10:59:24,350 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2023-04-01 10:59:24,350 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) [2023-04-01 10:59:24,350 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2023-04-01 10:59:24,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-04-01 10:59:24,351 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 10:59:24,351 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] [2023-04-01 10:59:24,351 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-04-01 10:59:24,351 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 10:59:24,352 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 10:59:24,352 INFO L85 PathProgramCache]: Analyzing trace with hash -1905136761, now seen corresponding path program 1 times [2023-04-01 10:59:24,352 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 10:59:24,352 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1257193075] [2023-04-01 10:59:24,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 10:59:24,352 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 10:59:24,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:59:24,566 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-04-01 10:59:24,566 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 10:59:24,566 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1257193075] [2023-04-01 10:59:24,568 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1257193075] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 10:59:24,568 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 10:59:24,568 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2023-04-01 10:59:24,569 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092582287] [2023-04-01 10:59:24,569 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 10:59:24,569 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-04-01 10:59:24,569 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 10:59:24,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-04-01 10:59:24,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2023-04-01 10:59:24,570 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) [2023-04-01 10:59:24,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 10:59:24,679 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2023-04-01 10:59:24,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-01 10:59:24,679 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 [2023-04-01 10:59:24,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 10:59:24,680 INFO L225 Difference]: With dead ends: 36 [2023-04-01 10:59:24,680 INFO L226 Difference]: Without dead ends: 33 [2023-04-01 10:59:24,680 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 [2023-04-01 10:59:24,680 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 [2023-04-01 10:59:24,681 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] [2023-04-01 10:59:24,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-04-01 10:59:24,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2023-04-01 10:59:24,684 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) [2023-04-01 10:59:24,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2023-04-01 10:59:24,686 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 37 [2023-04-01 10:59:24,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 10:59:24,687 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2023-04-01 10:59:24,687 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) [2023-04-01 10:59:24,687 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2023-04-01 10:59:24,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-04-01 10:59:24,689 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 10:59:24,689 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] [2023-04-01 10:59:24,689 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-04-01 10:59:24,689 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 10:59:24,690 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 10:59:24,690 INFO L85 PathProgramCache]: Analyzing trace with hash -1229497579, now seen corresponding path program 1 times [2023-04-01 10:59:24,690 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 10:59:24,690 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2123071241] [2023-04-01 10:59:24,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 10:59:24,690 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 10:59:24,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:59:27,209 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 8 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 10:59:27,210 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 10:59:27,210 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2123071241] [2023-04-01 10:59:27,210 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2123071241] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 10:59:27,210 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1083817609] [2023-04-01 10:59:27,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 10:59:27,210 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 10:59:27,210 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 10:59:27,214 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 10:59:27,218 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-01 10:59:27,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:59:27,364 INFO L262 TraceCheckSpWp]: Trace formula consists of 389 conjuncts, 132 conjunts are in the unsatisfiable core [2023-04-01 10:59:27,368 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 10:59:27,473 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-04-01 10:59:27,495 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 10:59:27,520 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2023-04-01 10:59:27,698 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 [2023-04-01 10:59:27,701 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 [2023-04-01 10:59:27,705 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-04-01 10:59:27,708 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-04-01 10:59:28,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 10:59:28,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 10:59:28,147 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 [2023-04-01 10:59:28,162 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 10:59:28,164 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 10:59:28,165 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 10:59:28,166 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 [2023-04-01 10:59:28,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 10:59:28,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 10:59:28,176 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 [2023-04-01 10:59:28,186 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 10 treesize of output 9 [2023-04-01 10:59:28,199 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 41 treesize of output 32 [2023-04-01 10:59:28,212 INFO L321 Elim1Store]: treesize reduction 4, result has 80.0 percent of original size [2023-04-01 10:59:28,213 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 [2023-04-01 10:59:28,219 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 [2023-04-01 10:59:28,233 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 [2023-04-01 10:59:28,418 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 10:59:28,418 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 [2023-04-01 10:59:28,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 10:59:28,425 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 [2023-04-01 10:59:28,554 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 8 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 10:59:28,554 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 10:59:29,074 WARN L839 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_447 (Array Int Int)) (v_ArrVal_446 (Array Int Int)) (v_ArrVal_448 (Array Int Int)) (v_sll_prepend_~new_head~1.base_9 Int) (v_ArrVal_445 (Array Int Int)) (v_ArrVal_444 (Array Int Int))) (or (not (= (select |c_#valid| v_sll_prepend_~new_head~1.base_9) 0)) (<= |c_#StackHeapBarrier| v_sll_prepend_~new_head~1.base_9) (= c_main_~data~0 (select (select (store (store |c_#memory_int| v_sll_prepend_~new_head~1.base_9 v_ArrVal_447) |c_main_~#s~0.base| v_ArrVal_448) (select (select (let ((.cse0 (store |c_#memory_$Pointer$.base| v_sll_prepend_~new_head~1.base_9 (store v_ArrVal_444 4 (select (select (store |c_#memory_$Pointer$.base| v_sll_prepend_~new_head~1.base_9 v_ArrVal_444) |c_main_~#s~0.base|) |c_main_~#s~0.offset|))))) (store .cse0 |c_main_~#s~0.base| (store (select .cse0 |c_main_~#s~0.base|) |c_main_~#s~0.offset| v_sll_prepend_~new_head~1.base_9))) v_sll_prepend_~new_head~1.base_9) 4)) (select (select (store (store |c_#memory_$Pointer$.offset| v_sll_prepend_~new_head~1.base_9 (store v_ArrVal_445 4 (select (select (store |c_#memory_$Pointer$.offset| v_sll_prepend_~new_head~1.base_9 v_ArrVal_445) |c_main_~#s~0.base|) |c_main_~#s~0.offset|))) |c_main_~#s~0.base| (store (select (store |c_#memory_$Pointer$.offset| v_sll_prepend_~new_head~1.base_9 v_ArrVal_446) |c_main_~#s~0.base|) |c_main_~#s~0.offset| 0)) v_sll_prepend_~new_head~1.base_9) 4))))) is different from false [2023-04-01 10:59:29,080 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1083817609] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 10:59:29,081 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1895841009] [2023-04-01 10:59:29,086 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-01 10:59:29,086 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 10:59:29,086 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 10:59:29,086 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 10:59:29,087 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 10:59:29,125 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 49 for LOIs [2023-04-01 10:59:29,544 INFO L197 IcfgInterpreter]: Interpreting procedure sll_prepend with input of size 72 for LOIs [2023-04-01 10:59:29,622 INFO L197 IcfgInterpreter]: Interpreting procedure sll_create with input of size 68 for LOIs [2023-04-01 10:59:29,835 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 27 for LOIs [2023-04-01 10:59:29,843 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 10:59:29,845 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 10:59:37,746 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '962#(and (= main_~data~0 1) (= (select |old(#valid)| |main_~#s~0.base|) 0) (= |main_~#s~0.offset| 0) (= (select |old(#valid)| 1) 1) (= (select |old(#length)| 1) 2) (= (select |old(#valid)| 0) 0) (not (= |#StackHeapBarrier| 0)) (= main_~len~0 2) (= main_~temp~2.base (select (select |#memory_$Pointer$.base| main_~ptr~0.base) (+ main_~ptr~0.offset 4))) (not (= (select (select |#memory_int| main_~ptr~0.base) main_~ptr~0.offset) 1)) (= (select (select |old(#memory_int)| 1) 0) 48) (= 22 (select |old(#length)| 2)) (not (= |main_~#s~0.base| 0)) (= |#NULL.offset| 0) (= (select (select |old(#memory_int)| 1) 1) 0) (= (select |old(#valid)| 2) 1) (= (select (select |#memory_$Pointer$.offset| main_~ptr~0.base) (+ main_~ptr~0.offset 4)) main_~temp~2.offset) (not (= |main_~#s~0.base| |#StackHeapBarrier|)) (= |#NULL.base| 0))' at error location [2023-04-01 10:59:37,746 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 10:59:37,746 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 10:59:37,746 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 34 [2023-04-01 10:59:37,746 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847833792] [2023-04-01 10:59:37,747 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 10:59:37,747 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2023-04-01 10:59:37,747 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 10:59:37,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2023-04-01 10:59:37,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=3486, Unknown=3, NotChecked=118, Total=3782 [2023-04-01 10:59:37,749 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) [2023-04-01 10:59:40,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 10:59:40,316 INFO L93 Difference]: Finished difference Result 42 states and 45 transitions. [2023-04-01 10:59:40,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-04-01 10:59:40,317 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 [2023-04-01 10:59:40,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 10:59:40,321 INFO L225 Difference]: With dead ends: 42 [2023-04-01 10:59:40,321 INFO L226 Difference]: Without dead ends: 40 [2023-04-01 10:59:40,323 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 73 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1044 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=280, Invalid=5123, Unknown=3, NotChecked=144, Total=5550 [2023-04-01 10:59:40,325 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 65 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 672 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 680 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 672 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2023-04-01 10:59:40,327 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 191 Invalid, 680 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 672 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2023-04-01 10:59:40,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2023-04-01 10:59:40,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 35. [2023-04-01 10:59:40,346 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) [2023-04-01 10:59:40,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 40 transitions. [2023-04-01 10:59:40,347 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 40 transitions. Word has length 39 [2023-04-01 10:59:40,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 10:59:40,347 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 40 transitions. [2023-04-01 10:59:40,348 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) [2023-04-01 10:59:40,348 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 40 transitions. [2023-04-01 10:59:40,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-04-01 10:59:40,349 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 10:59:40,349 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 10:59:40,356 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-01 10:59:40,555 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 [2023-04-01 10:59:40,555 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 10:59:40,555 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 10:59:40,556 INFO L85 PathProgramCache]: Analyzing trace with hash -1229446398, now seen corresponding path program 1 times [2023-04-01 10:59:40,556 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 10:59:40,556 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [903334781] [2023-04-01 10:59:40,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 10:59:40,556 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 10:59:40,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:59:41,678 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 10:59:41,678 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 10:59:41,678 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [903334781] [2023-04-01 10:59:41,678 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [903334781] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 10:59:41,678 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [800923003] [2023-04-01 10:59:41,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 10:59:41,679 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 10:59:41,679 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 10:59:41,692 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 10:59:41,698 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-01 10:59:41,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:59:41,840 INFO L262 TraceCheckSpWp]: Trace formula consists of 386 conjuncts, 70 conjunts are in the unsatisfiable core [2023-04-01 10:59:41,843 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 10:59:42,046 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 4 [2023-04-01 10:59:42,403 INFO L321 Elim1Store]: treesize reduction 26, result has 42.2 percent of original size [2023-04-01 10:59:42,403 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 [2023-04-01 10:59:42,415 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 [2023-04-01 10:59:42,427 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 [2023-04-01 10:59:42,468 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 [2023-04-01 10:59:42,474 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 [2023-04-01 10:59:42,615 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 10:59:42,620 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 10:59:42,620 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 [2023-04-01 10:59:42,625 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 [2023-04-01 10:59:42,633 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 [2023-04-01 10:59:42,710 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-04-01 10:59:42,794 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 10:59:42,795 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 [2023-04-01 10:59:42,801 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 10:59:42,802 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 10:59:43,179 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 [2023-04-01 10:59:43,181 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [800923003] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 10:59:43,182 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [443334302] [2023-04-01 10:59:43,183 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2023-04-01 10:59:43,183 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 10:59:43,183 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 10:59:43,183 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 10:59:43,183 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 10:59:43,207 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 49 for LOIs [2023-04-01 10:59:43,740 INFO L197 IcfgInterpreter]: Interpreting procedure sll_prepend with input of size 72 for LOIs [2023-04-01 10:59:43,822 INFO L197 IcfgInterpreter]: Interpreting procedure sll_create with input of size 68 for LOIs [2023-04-01 10:59:44,067 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 27 for LOIs [2023-04-01 10:59:44,080 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 10:59:44,082 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 10:59:52,772 WARN L223 SmtUtils]: Spent 5.44s on a formula simplification that was a NOOP. DAG size: 83 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-04-01 10:59:54,080 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1296#(and (or (and (= main_~data~0 1) (= (select |old(#valid)| |main_~#s~0.base|) 0) (= |main_~#s~0.offset| 0) (= main_~count~0 0) (= (select |old(#valid)| 1) 1) (= (select |old(#length)| 1) 2) (= (select |old(#valid)| 0) 0) (= (select (select |#memory_$Pointer$.offset| |main_~#s~0.base|) 0) 0) (not (= |#StackHeapBarrier| 0)) (= main_~len~0 2) (= (select (select |old(#memory_int)| 1) 0) 48) (= 22 (select |old(#length)| 2)) (not (= |main_~#s~0.base| 0)) (= |#NULL.offset| 0) (= (select (select |old(#memory_int)| 1) 1) 0) (= (select |old(#valid)| 2) 1) (= (select (select |#memory_$Pointer$.base| |main_~#s~0.base|) 0) 0) (not (= |main_~#s~0.base| |#StackHeapBarrier|)) (= |#NULL.base| 0)) (and (= main_~data~0 1) (= (select |old(#valid)| |main_~#s~0.base|) 0) (= |main_~#s~0.offset| 0) (= (select |old(#valid)| 1) 1) (= (select |old(#length)| 1) 2) (= (select |old(#valid)| 0) 0) (= 0 main_~temp~2.offset) (not (= |#StackHeapBarrier| 0)) (= main_~len~0 2) (= (select (select |old(#memory_int)| 1) 0) 48) (= 22 (select |old(#length)| 2)) (= main_~temp~2.base 0) (not (= |main_~#s~0.base| 0)) (= |#NULL.offset| 0) (= (select (select |old(#memory_int)| 1) 1) 0) (= (select |old(#valid)| 2) 1) (not (= |main_~#s~0.base| |#StackHeapBarrier|)) (= |#NULL.base| 0))) (= main_~ptr~0.offset 0) (= main_~ptr~0.base 0) (not (= (+ main_~len~0 1) main_~count~0)))' at error location [2023-04-01 10:59:54,081 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 10:59:54,081 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 10:59:54,081 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 29 [2023-04-01 10:59:54,081 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547686974] [2023-04-01 10:59:54,081 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 10:59:54,081 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-04-01 10:59:54,081 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 10:59:54,082 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-04-01 10:59:54,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=2805, Unknown=2, NotChecked=106, Total=3080 [2023-04-01 10:59:54,083 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) [2023-04-01 10:59:55,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 10:59:55,159 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2023-04-01 10:59:55,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-04-01 10:59:55,159 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 [2023-04-01 10:59:55,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 10:59:55,160 INFO L225 Difference]: With dead ends: 38 [2023-04-01 10:59:55,160 INFO L226 Difference]: Without dead ends: 35 [2023-04-01 10:59:55,161 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 862 ImplicationChecksByTransitivity, 11.8s TimeCoverageRelationStatistics Valid=248, Invalid=3914, Unknown=2, NotChecked=126, Total=4290 [2023-04-01 10:59:55,161 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 54 mSDsluCounter, 242 mSDsCounter, 0 mSdLazyCounter, 493 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 493 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-04-01 10:59:55,162 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 261 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 493 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-04-01 10:59:55,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-04-01 10:59:55,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2023-04-01 10:59:55,166 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) [2023-04-01 10:59:55,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2023-04-01 10:59:55,166 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 39 [2023-04-01 10:59:55,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 10:59:55,166 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2023-04-01 10:59:55,167 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) [2023-04-01 10:59:55,167 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2023-04-01 10:59:55,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-04-01 10:59:55,167 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 10:59:55,167 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] [2023-04-01 10:59:55,173 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-04-01 10:59:55,372 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 [2023-04-01 10:59:55,373 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 10:59:55,373 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 10:59:55,373 INFO L85 PathProgramCache]: Analyzing trace with hash -431120432, now seen corresponding path program 2 times [2023-04-01 10:59:55,373 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 10:59:55,373 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1441754133] [2023-04-01 10:59:55,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 10:59:55,374 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 10:59:55,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 10:59:59,693 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 3 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 10:59:59,693 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 10:59:59,693 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1441754133] [2023-04-01 10:59:59,693 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1441754133] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 10:59:59,693 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2073180406] [2023-04-01 10:59:59,693 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 10:59:59,693 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 10:59:59,694 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 10:59:59,695 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 10:59:59,697 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-01 10:59:59,941 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-01 10:59:59,941 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 10:59:59,945 INFO L262 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 189 conjunts are in the unsatisfiable core [2023-04-01 10:59:59,950 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 10:59:59,957 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-04-01 11:00:00,024 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 [2023-04-01 11:00:00,125 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 11:00:00,345 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2023-04-01 11:00:00,793 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 11:00:00,794 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 [2023-04-01 11:00:00,952 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 11:00:00,967 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 11:00:00,967 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 [2023-04-01 11:00:00,975 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 11:00:01,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 11:00:01,316 INFO L321 Elim1Store]: treesize reduction 64, result has 26.4 percent of original size [2023-04-01 11:00:01,316 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 41 treesize of output 45 [2023-04-01 11:00:01,675 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 11:00:01,675 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 84 treesize of output 39 [2023-04-01 11:00:01,683 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-04-01 11:00:01,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 11:00:01,692 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 [2023-04-01 11:00:01,697 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 11:00:01,698 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 [2023-04-01 11:00:02,420 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 11:00:02,424 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 11:00:02,439 INFO L321 Elim1Store]: treesize reduction 47, result has 9.6 percent of original size [2023-04-01 11:00:02,439 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 107 treesize of output 82 [2023-04-01 11:00:02,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 11:00:02,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 11:00:02,450 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 4 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 [2023-04-01 11:00:02,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 11:00:02,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 11:00:02,471 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 11:00:02,472 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 11:00:02,473 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 [2023-04-01 11:00:02,480 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 88 treesize of output 69 [2023-04-01 11:00:02,485 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 [2023-04-01 11:00:02,495 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 [2023-04-01 11:00:02,511 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 11:00:02,512 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 11:00:02,514 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 11:00:02,521 INFO L321 Elim1Store]: treesize reduction 4, result has 83.3 percent of original size [2023-04-01 11:00:02,522 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 [2023-04-01 11:00:02,537 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 [2023-04-01 11:00:03,444 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-04-01 11:00:03,444 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 143 treesize of output 57 [2023-04-01 11:00:03,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 11:00:03,454 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 11:00:03,455 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 [2023-04-01 11:00:03,802 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 3 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:00:03,803 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:00:05,119 WARN L839 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_810 (Array Int Int)) (v_ArrVal_812 (Array Int Int)) (v_ArrVal_811 (Array Int Int)) (v_sll_prepend_~new_head~1.base_15 Int) (v_ArrVal_809 (Array Int Int)) (v_ArrVal_808 (Array Int Int))) (or (not (= (select |c_#valid| v_sll_prepend_~new_head~1.base_15) 0)) (= c_main_~data~0 (let ((.cse3 (let ((.cse4 (store |c_#memory_$Pointer$.offset| v_sll_prepend_~new_head~1.base_15 (store v_ArrVal_810 4 (select (select (store |c_#memory_$Pointer$.offset| v_sll_prepend_~new_head~1.base_15 v_ArrVal_810) |c_main_~#s~0.base|) |c_main_~#s~0.offset|))))) (store .cse4 |c_main_~#s~0.base| (store (select .cse4 |c_main_~#s~0.base|) |c_main_~#s~0.offset| 0)))) (.cse0 (store (store |c_#memory_$Pointer$.base| v_sll_prepend_~new_head~1.base_15 (store v_ArrVal_812 4 (select (select (store |c_#memory_$Pointer$.base| v_sll_prepend_~new_head~1.base_15 v_ArrVal_812) |c_main_~#s~0.base|) |c_main_~#s~0.offset|))) |c_main_~#s~0.base| (store (select (store |c_#memory_$Pointer$.base| v_sll_prepend_~new_head~1.base_15 v_ArrVal_808) |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 (+ (select (select .cse3 v_sll_prepend_~new_head~1.base_15) 4) 4))) (select (select (store (store |c_#memory_int| v_sll_prepend_~new_head~1.base_15 v_ArrVal_809) |c_main_~#s~0.base| v_ArrVal_811) (select (select .cse0 .cse1) .cse2)) (select (select .cse3 .cse1) .cse2))))) (<= |c_#StackHeapBarrier| v_sll_prepend_~new_head~1.base_15))) is different from false [2023-04-01 11:00:05,121 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2073180406] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:00:05,122 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1201549798] [2023-04-01 11:00:05,124 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-04-01 11:00:05,124 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:00:05,125 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:00:05,125 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:00:05,125 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:00:05,157 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 49 for LOIs [2023-04-01 11:00:05,615 INFO L197 IcfgInterpreter]: Interpreting procedure sll_prepend with input of size 72 for LOIs [2023-04-01 11:00:05,694 INFO L197 IcfgInterpreter]: Interpreting procedure sll_create with input of size 68 for LOIs [2023-04-01 11:00:05,940 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 27 for LOIs [2023-04-01 11:00:05,950 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:00:05,954 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:00:14,672 WARN L223 SmtUtils]: Spent 5.09s on a formula simplification that was a NOOP. DAG size: 83 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-04-01 11:00:15,545 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1658#(and (= main_~data~0 1) (= (select |old(#valid)| |main_~#s~0.base|) 0) (= |main_~#s~0.offset| 0) (= (select |old(#valid)| 1) 1) (= (select |old(#length)| 1) 2) (= (select |old(#valid)| 0) 0) (not (= |#StackHeapBarrier| 0)) (= main_~len~0 2) (= main_~temp~2.base (select (select |#memory_$Pointer$.base| main_~ptr~0.base) (+ main_~ptr~0.offset 4))) (not (= (select (select |#memory_int| main_~ptr~0.base) main_~ptr~0.offset) 1)) (= (select (select |old(#memory_int)| 1) 0) 48) (= 22 (select |old(#length)| 2)) (not (= |main_~#s~0.base| 0)) (= |#NULL.offset| 0) (= (select (select |old(#memory_int)| 1) 1) 0) (= (select |old(#valid)| 2) 1) (= (select (select |#memory_$Pointer$.offset| main_~ptr~0.base) (+ main_~ptr~0.offset 4)) main_~temp~2.offset) (not (= |main_~#s~0.base| |#StackHeapBarrier|)) (= |#NULL.base| 0))' at error location [2023-04-01 11:00:15,545 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:00:15,545 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 11:00:15,546 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 52 [2023-04-01 11:00:15,546 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1141736355] [2023-04-01 11:00:15,546 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 11:00:15,546 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2023-04-01 11:00:15,546 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:00:15,547 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2023-04-01 11:00:15,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=6232, Unknown=7, NotChecked=158, Total=6642 [2023-04-01 11:00:15,550 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) [2023-04-01 11:00:18,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:00:18,936 INFO L93 Difference]: Finished difference Result 64 states and 71 transitions. [2023-04-01 11:00:18,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-04-01 11:00:18,937 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 [2023-04-01 11:00:18,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:00:18,937 INFO L225 Difference]: With dead ends: 64 [2023-04-01 11:00:18,937 INFO L226 Difference]: Without dead ends: 62 [2023-04-01 11:00:18,939 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 93 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1871 ImplicationChecksByTransitivity, 16.6s TimeCoverageRelationStatistics Valid=365, Invalid=8374, Unknown=7, NotChecked=184, Total=8930 [2023-04-01 11:00:18,939 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 63 mSDsluCounter, 273 mSDsCounter, 0 mSdLazyCounter, 1231 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 289 SdHoareTripleChecker+Invalid, 1248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 1231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2023-04-01 11:00:18,939 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 289 Invalid, 1248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 1231 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2023-04-01 11:00:18,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2023-04-01 11:00:18,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 47. [2023-04-01 11:00:18,946 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) [2023-04-01 11:00:18,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2023-04-01 11:00:18,947 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 41 [2023-04-01 11:00:18,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:00:18,947 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2023-04-01 11:00:18,947 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) [2023-04-01 11:00:18,947 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2023-04-01 11:00:18,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-04-01 11:00:18,948 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:00:18,948 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] [2023-04-01 11:00:18,958 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-01 11:00:19,157 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 [2023-04-01 11:00:19,158 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:00:19,159 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:00:19,159 INFO L85 PathProgramCache]: Analyzing trace with hash -431069251, now seen corresponding path program 2 times [2023-04-01 11:00:19,159 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:00:19,159 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1576993722] [2023-04-01 11:00:19,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:00:19,159 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:00:19,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat