/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain OctagonDomain -i ../sv-benchmarks/c/list-simple/dll2n_append_equal.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 04:54:04,226 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 04:54:04,228 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 04:54:04,253 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 04:54:04,254 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 04:54:04,255 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 04:54:04,256 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 04:54:04,257 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 04:54:04,259 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 04:54:04,259 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 04:54:04,260 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 04:54:04,261 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 04:54:04,262 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 04:54:04,262 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 04:54:04,263 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 04:54:04,264 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 04:54:04,265 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 04:54:04,266 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 04:54:04,267 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 04:54:04,268 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 04:54:04,270 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 04:54:04,271 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 04:54:04,271 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 04:54:04,272 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 04:54:04,275 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 04:54:04,275 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 04:54:04,275 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 04:54:04,276 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 04:54:04,277 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 04:54:04,277 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 04:54:04,278 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 04:54:04,278 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 04:54:04,279 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 04:54:04,279 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 04:54:04,280 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 04:54:04,280 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 04:54:04,281 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 04:54:04,281 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 04:54:04,281 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 04:54:04,282 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 04:54:04,282 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 04:54:04,283 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 04:54:04,302 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 04:54:04,302 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 04:54:04,302 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 04:54:04,303 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 04:54:04,303 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 04:54:04,303 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 04:54:04,304 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 04:54:04,304 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 04:54:04,304 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 04:54:04,304 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 04:54:04,304 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 04:54:04,305 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 04:54:04,305 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 04:54:04,305 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 04:54:04,305 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 04:54:04,305 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 04:54:04,306 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 04:54:04,306 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 04:54:04,306 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 04:54:04,307 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 04:54:04,307 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 04:54:04,307 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 04:54:04,307 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 04:54:04,307 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 04:54:04,308 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 04:54:04,308 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 04:54:04,308 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 04:54:04,308 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 04:54:04,308 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 04:54:04,309 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 04:54:04,309 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 04:54:04,309 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 04:54:04,309 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 04:54:04,309 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 04:54:04,310 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 04:54:04,310 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 04:54:04,310 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 04:54:04,310 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 04:54:04,310 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 04:54:04,311 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 04:54:04,311 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 04:54:04,311 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-01 04:54:04,556 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 04:54:04,577 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 04:54:04,579 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 04:54:04,580 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 04:54:04,581 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 04:54:04,582 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/list-simple/dll2n_append_equal.i [2023-04-01 04:54:05,783 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 04:54:05,996 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 04:54:05,997 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-simple/dll2n_append_equal.i [2023-04-01 04:54:06,010 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e8ff562cd/f0d183ad5399470d9092ce61f1db4fa5/FLAG2d46e76c8 [2023-04-01 04:54:06,030 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e8ff562cd/f0d183ad5399470d9092ce61f1db4fa5 [2023-04-01 04:54:06,033 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 04:54:06,035 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 04:54:06,038 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 04:54:06,039 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 04:54:06,043 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 04:54:06,043 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 04:54:06" (1/1) ... [2023-04-01 04:54:06,044 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@fffe16b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:54:06, skipping insertion in model container [2023-04-01 04:54:06,045 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 04:54:06" (1/1) ... [2023-04-01 04:54:06,051 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 04:54:06,094 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 04:54:06,399 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-simple/dll2n_append_equal.i[24333,24346] [2023-04-01 04:54:06,407 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 04:54:06,422 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 04:54:06,455 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-simple/dll2n_append_equal.i[24333,24346] [2023-04-01 04:54:06,455 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 04:54:06,481 INFO L208 MainTranslator]: Completed translation [2023-04-01 04:54:06,481 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:54:06 WrapperNode [2023-04-01 04:54:06,482 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 04:54:06,483 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 04:54:06,483 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 04:54:06,483 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 04:54:06,493 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:54:06" (1/1) ... [2023-04-01 04:54:06,494 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:54:06" (1/1) ... [2023-04-01 04:54:06,509 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:54:06" (1/1) ... [2023-04-01 04:54:06,509 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:54:06" (1/1) ... [2023-04-01 04:54:06,524 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:54:06" (1/1) ... [2023-04-01 04:54:06,528 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:54:06" (1/1) ... [2023-04-01 04:54:06,531 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:54:06" (1/1) ... [2023-04-01 04:54:06,533 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:54:06" (1/1) ... [2023-04-01 04:54:06,538 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 04:54:06,539 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 04:54:06,539 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 04:54:06,539 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 04:54:06,540 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:54:06" (1/1) ... [2023-04-01 04:54:06,560 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 04:54:06,570 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 04:54:06,586 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 04:54:06,590 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 04:54:06,619 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 04:54:06,619 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 04:54:06,620 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 04:54:06,620 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2023-04-01 04:54:06,620 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2023-04-01 04:54:06,620 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2023-04-01 04:54:06,620 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-04-01 04:54:06,620 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_create [2023-04-01 04:54:06,620 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_destroy [2023-04-01 04:54:06,620 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_append [2023-04-01 04:54:06,621 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 04:54:06,621 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 04:54:06,621 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 04:54:06,621 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-04-01 04:54:06,621 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-04-01 04:54:06,621 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 04:54:06,621 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 04:54:06,621 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2023-04-01 04:54:06,621 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2023-04-01 04:54:06,622 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2023-04-01 04:54:06,622 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2023-04-01 04:54:06,622 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2023-04-01 04:54:06,622 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2023-04-01 04:54:06,622 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2023-04-01 04:54:06,622 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2023-04-01 04:54:06,622 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2023-04-01 04:54:06,622 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2023-04-01 04:54:06,622 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2023-04-01 04:54:06,623 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2023-04-01 04:54:06,623 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2023-04-01 04:54:06,623 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2023-04-01 04:54:06,623 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2023-04-01 04:54:06,623 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2023-04-01 04:54:06,623 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2023-04-01 04:54:06,623 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2023-04-01 04:54:06,623 INFO L130 BoogieDeclarations]: Found specification of procedure select [2023-04-01 04:54:06,623 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2023-04-01 04:54:06,623 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2023-04-01 04:54:06,624 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2023-04-01 04:54:06,624 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2023-04-01 04:54:06,624 INFO L130 BoogieDeclarations]: Found specification of procedure random [2023-04-01 04:54:06,624 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2023-04-01 04:54:06,624 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2023-04-01 04:54:06,624 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2023-04-01 04:54:06,624 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2023-04-01 04:54:06,624 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2023-04-01 04:54:06,625 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2023-04-01 04:54:06,625 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2023-04-01 04:54:06,625 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2023-04-01 04:54:06,625 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2023-04-01 04:54:06,625 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2023-04-01 04:54:06,625 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2023-04-01 04:54:06,625 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2023-04-01 04:54:06,625 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2023-04-01 04:54:06,625 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2023-04-01 04:54:06,626 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2023-04-01 04:54:06,626 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2023-04-01 04:54:06,626 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2023-04-01 04:54:06,626 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2023-04-01 04:54:06,626 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2023-04-01 04:54:06,626 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2023-04-01 04:54:06,626 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2023-04-01 04:54:06,626 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2023-04-01 04:54:06,627 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2023-04-01 04:54:06,627 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2023-04-01 04:54:06,627 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2023-04-01 04:54:06,627 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2023-04-01 04:54:06,627 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2023-04-01 04:54:06,627 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2023-04-01 04:54:06,627 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2023-04-01 04:54:06,627 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2023-04-01 04:54:06,627 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2023-04-01 04:54:06,628 INFO L130 BoogieDeclarations]: Found specification of procedure free [2023-04-01 04:54:06,628 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2023-04-01 04:54:06,628 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2023-04-01 04:54:06,628 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2023-04-01 04:54:06,628 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2023-04-01 04:54:06,628 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2023-04-01 04:54:06,628 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2023-04-01 04:54:06,628 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2023-04-01 04:54:06,628 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2023-04-01 04:54:06,629 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2023-04-01 04:54:06,629 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2023-04-01 04:54:06,629 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2023-04-01 04:54:06,629 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2023-04-01 04:54:06,629 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2023-04-01 04:54:06,629 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2023-04-01 04:54:06,629 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2023-04-01 04:54:06,629 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2023-04-01 04:54:06,629 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2023-04-01 04:54:06,630 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2023-04-01 04:54:06,630 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2023-04-01 04:54:06,630 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2023-04-01 04:54:06,630 INFO L130 BoogieDeclarations]: Found specification of procedure system [2023-04-01 04:54:06,630 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2023-04-01 04:54:06,630 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2023-04-01 04:54:06,630 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2023-04-01 04:54:06,630 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2023-04-01 04:54:06,631 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2023-04-01 04:54:06,631 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2023-04-01 04:54:06,631 INFO L130 BoogieDeclarations]: Found specification of procedure div [2023-04-01 04:54:06,631 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2023-04-01 04:54:06,631 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2023-04-01 04:54:06,631 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2023-04-01 04:54:06,631 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2023-04-01 04:54:06,631 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2023-04-01 04:54:06,631 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2023-04-01 04:54:06,632 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2023-04-01 04:54:06,632 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2023-04-01 04:54:06,632 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2023-04-01 04:54:06,632 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2023-04-01 04:54:06,632 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2023-04-01 04:54:06,632 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2023-04-01 04:54:06,632 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2023-04-01 04:54:06,632 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2023-04-01 04:54:06,632 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2023-04-01 04:54:06,633 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2023-04-01 04:54:06,633 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2023-04-01 04:54:06,633 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2023-04-01 04:54:06,633 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2023-04-01 04:54:06,633 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2023-04-01 04:54:06,633 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2023-04-01 04:54:06,633 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-04-01 04:54:06,633 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-04-01 04:54:06,633 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-04-01 04:54:06,634 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 04:54:06,634 INFO L130 BoogieDeclarations]: Found specification of procedure dll_create [2023-04-01 04:54:06,634 INFO L130 BoogieDeclarations]: Found specification of procedure dll_destroy [2023-04-01 04:54:06,634 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-04-01 04:54:06,634 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 04:54:06,634 INFO L130 BoogieDeclarations]: Found specification of procedure dll_append [2023-04-01 04:54:06,634 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 04:54:06,634 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-01 04:54:06,635 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-04-01 04:54:06,635 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 04:54:06,635 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 04:54:06,635 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 04:54:06,635 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 04:54:06,831 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 04:54:06,833 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 04:54:06,928 INFO L771 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2023-04-01 04:54:07,149 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 04:54:07,210 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 04:54:07,211 INFO L302 CfgBuilder]: Removed 4 assume(true) statements. [2023-04-01 04:54:07,213 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 04:54:07 BoogieIcfgContainer [2023-04-01 04:54:07,213 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 04:54:07,215 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 04:54:07,215 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 04:54:07,223 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 04:54:07,223 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 04:54:06" (1/3) ... [2023-04-01 04:54:07,224 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47ba577 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 04:54:07, skipping insertion in model container [2023-04-01 04:54:07,224 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:54:06" (2/3) ... [2023-04-01 04:54:07,225 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47ba577 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 04:54:07, skipping insertion in model container [2023-04-01 04:54:07,225 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 04:54:07" (3/3) ... [2023-04-01 04:54:07,229 INFO L112 eAbstractionObserver]: Analyzing ICFG dll2n_append_equal.i [2023-04-01 04:54:07,247 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 04:54:07,248 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 04:54:07,301 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 04:54:07,308 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;@65e1350a, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 04:54:07,308 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 04:54:07,312 INFO L276 IsEmpty]: Start isEmpty. Operand has 44 states, 28 states have (on average 1.3571428571428572) internal successors, (38), 29 states have internal predecessors, (38), 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 04:54:07,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-04-01 04:54:07,321 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:54:07,322 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 04:54:07,323 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:54:07,329 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:54:07,330 INFO L85 PathProgramCache]: Analyzing trace with hash -1972015361, now seen corresponding path program 1 times [2023-04-01 04:54:07,339 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:54:07,339 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [70291089] [2023-04-01 04:54:07,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:54:07,340 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:54:07,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:54:07,830 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 04:54:07,830 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:54:07,831 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [70291089] [2023-04-01 04:54:07,831 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [70291089] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 04:54:07,831 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 04:54:07,831 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-01 04:54:07,833 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [121287953] [2023-04-01 04:54:07,833 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 04:54:07,837 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-01 04:54:07,837 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 04:54:07,866 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-01 04:54:07,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-01 04:54:07,869 INFO L87 Difference]: Start difference. First operand has 44 states, 28 states have (on average 1.3571428571428572) internal successors, (38), 29 states have internal predecessors, (38), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 5 states, 3 states have (on average 5.333333333333333) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2023-04-01 04:54:07,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 04:54:07,988 INFO L93 Difference]: Finished difference Result 81 states and 100 transitions. [2023-04-01 04:54:07,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-04-01 04:54:07,990 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 5.333333333333333) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 25 [2023-04-01 04:54:07,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 04:54:07,997 INFO L225 Difference]: With dead ends: 81 [2023-04-01 04:54:07,997 INFO L226 Difference]: Without dead ends: 35 [2023-04-01 04:54:08,003 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 04:54:08,009 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 13 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 04:54:08,011 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 150 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 04:54:08,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-04-01 04:54:08,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2023-04-01 04:54:08,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 22 states have internal predecessors, (27), 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 04:54:08,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2023-04-01 04:54:08,049 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 25 [2023-04-01 04:54:08,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 04:54:08,050 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2023-04-01 04:54:08,050 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 5.333333333333333) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2023-04-01 04:54:08,051 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2023-04-01 04:54:08,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-04-01 04:54:08,056 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:54:08,056 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 04:54:08,057 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 04:54:08,057 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:54:08,058 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:54:08,058 INFO L85 PathProgramCache]: Analyzing trace with hash 1149101964, now seen corresponding path program 1 times [2023-04-01 04:54:08,058 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:54:08,058 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1567887835] [2023-04-01 04:54:08,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:54:08,059 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:54:08,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:54:08,288 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 04:54:08,288 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:54:08,288 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1567887835] [2023-04-01 04:54:08,288 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1567887835] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 04:54:08,288 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2037191300] [2023-04-01 04:54:08,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:54:08,289 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 04:54:08,289 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 04:54:08,293 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 04:54:08,311 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 04:54:08,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:54:08,489 INFO L262 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 5 conjunts are in the unsatisfiable core [2023-04-01 04:54:08,496 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 04:54:08,598 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 04:54:08,599 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 04:54:08,711 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 04:54:08,712 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2037191300] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 04:54:08,712 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1918123374] [2023-04-01 04:54:08,730 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-04-01 04:54:08,730 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 04:54:08,733 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 04:54:08,738 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 04:54:08,739 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 04:54:08,801 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-04-01 04:54:09,358 INFO L197 IcfgInterpreter]: Interpreting procedure dll_append with input of size 35 for LOIs [2023-04-01 04:54:09,603 INFO L197 IcfgInterpreter]: Interpreting procedure dll_create with input of size 44 for LOIs [2023-04-01 04:54:10,021 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 11 for LOIs [2023-04-01 04:54:10,036 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 04:54:10,040 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 04:54:11,396 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '421#(and (= main_~data~0 1) (<= 1 |#StackHeapBarrier|) (= |main_~#s~0.offset| 0) (= main_~count~0 0) (= main_~ptr~0.offset 0) (= (select (select |#memory_$Pointer$.offset| |main_~#s~0.base|) 0) 0) (= main_~len~0 2) (= main_~ptr~0.base 0) (= |#NULL.offset| 0) (<= (+ |#StackHeapBarrier| 1) |main_~#s~0.base|) (= (select (select |#memory_$Pointer$.base| |main_~#s~0.base|) 0) 0) (= |#NULL.base| 0))' at error location [2023-04-01 04:54:11,396 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 04:54:11,396 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 04:54:11,396 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-04-01 04:54:11,397 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22641489] [2023-04-01 04:54:11,397 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 04:54:11,398 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-04-01 04:54:11,398 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 04:54:11,399 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-04-01 04:54:11,400 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=1048, Unknown=0, NotChecked=0, Total=1190 [2023-04-01 04:54:11,400 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand has 12 states, 8 states have (on average 4.25) internal successors, (34), 12 states have internal predecessors, (34), 7 states have call successors, (11), 2 states have call predecessors, (11), 4 states have return successors, (10), 5 states have call predecessors, (10), 7 states have call successors, (10) [2023-04-01 04:54:11,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 04:54:11,496 INFO L93 Difference]: Finished difference Result 60 states and 71 transitions. [2023-04-01 04:54:11,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-01 04:54:11,497 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 8 states have (on average 4.25) internal successors, (34), 12 states have internal predecessors, (34), 7 states have call successors, (11), 2 states have call predecessors, (11), 4 states have return successors, (10), 5 states have call predecessors, (10), 7 states have call successors, (10) Word has length 32 [2023-04-01 04:54:11,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 04:54:11,498 INFO L225 Difference]: With dead ends: 60 [2023-04-01 04:54:11,498 INFO L226 Difference]: Without dead ends: 38 [2023-04-01 04:54:11,499 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 459 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=158, Invalid=1174, Unknown=0, NotChecked=0, Total=1332 [2023-04-01 04:54:11,500 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 20 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 04:54:11,501 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 131 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 04:54:11,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-04-01 04:54:11,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2023-04-01 04:54:11,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 24 states have internal predecessors, (29), 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 04:54:11,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 42 transitions. [2023-04-01 04:54:11,507 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 42 transitions. Word has length 32 [2023-04-01 04:54:11,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 04:54:11,508 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 42 transitions. [2023-04-01 04:54:11,508 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 8 states have (on average 4.25) internal successors, (34), 12 states have internal predecessors, (34), 7 states have call successors, (11), 2 states have call predecessors, (11), 4 states have return successors, (10), 5 states have call predecessors, (10), 7 states have call successors, (10) [2023-04-01 04:54:11,508 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 42 transitions. [2023-04-01 04:54:11,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-04-01 04:54:11,509 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:54:11,509 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 04:54:11,521 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 04:54:11,716 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 04:54:11,717 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:54:11,717 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:54:11,717 INFO L85 PathProgramCache]: Analyzing trace with hash 1971594847, now seen corresponding path program 2 times [2023-04-01 04:54:11,717 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:54:11,718 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1036342816] [2023-04-01 04:54:11,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:54:11,718 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:54:11,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:54:12,138 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 04:54:12,139 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:54:12,141 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1036342816] [2023-04-01 04:54:12,141 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1036342816] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 04:54:12,141 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 04:54:12,141 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2023-04-01 04:54:12,141 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1938949556] [2023-04-01 04:54:12,141 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 04:54:12,142 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-04-01 04:54:12,142 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 04:54:12,142 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-04-01 04:54:12,143 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2023-04-01 04:54:12,143 INFO L87 Difference]: Start difference. First operand 36 states and 42 transitions. Second operand has 10 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 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 04:54:12,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 04:54:12,284 INFO L93 Difference]: Finished difference Result 51 states and 58 transitions. [2023-04-01 04:54:12,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-01 04:54:12,284 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 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 39 [2023-04-01 04:54:12,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 04:54:12,286 INFO L225 Difference]: With dead ends: 51 [2023-04-01 04:54:12,286 INFO L226 Difference]: Without dead ends: 48 [2023-04-01 04:54:12,286 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2023-04-01 04:54:12,287 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 31 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 161 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 04:54:12,287 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 161 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 04:54:12,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2023-04-01 04:54:12,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 40. [2023-04-01 04:54:12,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 27 states have internal predecessors, (32), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2023-04-01 04:54:12,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 46 transitions. [2023-04-01 04:54:12,294 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 46 transitions. Word has length 39 [2023-04-01 04:54:12,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 04:54:12,294 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 46 transitions. [2023-04-01 04:54:12,294 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 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 04:54:12,295 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 46 transitions. [2023-04-01 04:54:12,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-04-01 04:54:12,295 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:54:12,296 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 04:54:12,296 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-04-01 04:54:12,296 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:54:12,296 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:54:12,296 INFO L85 PathProgramCache]: Analyzing trace with hash 1971526368, now seen corresponding path program 1 times [2023-04-01 04:54:12,296 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:54:12,297 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1164881876] [2023-04-01 04:54:12,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:54:12,297 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:54:12,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:54:12,862 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 04:54:12,862 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:54:12,862 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1164881876] [2023-04-01 04:54:12,864 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1164881876] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 04:54:12,865 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [926131532] [2023-04-01 04:54:12,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:54:12,866 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 04:54:12,866 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 04:54:12,867 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 04:54:12,894 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 04:54:13,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:54:13,095 INFO L262 TraceCheckSpWp]: Trace formula consists of 447 conjuncts, 36 conjunts are in the unsatisfiable core [2023-04-01 04:54:13,098 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 04:54:13,219 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 04:54:13,277 WARN L861 $PredicateComparison]: unable to prove that (exists ((node_create_~temp~0.base Int)) (and (<= (+ node_create_~temp~0.base 1) |c_#StackHeapBarrier|) (exists ((v_ArrVal_473 (Array Int Int))) (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| node_create_~temp~0.base v_ArrVal_473))))) is different from true [2023-04-01 04:54:13,425 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 1 not checked. [2023-04-01 04:54:13,425 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 04:54:13,491 WARN L839 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_479 (Array Int Int)) (v_node_create_~temp~0.base_24 Int)) (or (<= |c_#StackHeapBarrier| v_node_create_~temp~0.base_24) (not (= 0 (select (select (store |c_#memory_$Pointer$.base| v_node_create_~temp~0.base_24 v_ArrVal_479) |c_main_~#s~0.base|) |c_main_~#s~0.offset|))))) is different from false [2023-04-01 04:54:13,493 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [926131532] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 04:54:13,493 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [900834689] [2023-04-01 04:54:13,501 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-04-01 04:54:13,501 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 04:54:13,502 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 04:54:13,502 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 04:54:13,502 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 04:54:13,524 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-04-01 04:54:13,854 INFO L197 IcfgInterpreter]: Interpreting procedure dll_append with input of size 35 for LOIs [2023-04-01 04:54:14,027 INFO L197 IcfgInterpreter]: Interpreting procedure dll_create with input of size 44 for LOIs [2023-04-01 04:54:14,342 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 11 for LOIs [2023-04-01 04:54:14,355 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 04:54:14,358 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 04:54:15,929 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '892#(and (= main_~data~0 1) (<= 1 |#StackHeapBarrier|) (= |main_~#s~0.offset| 0) (= main_~count~0 0) (= main_~ptr~0.base (select (select |#memory_$Pointer$.base| |main_~#s~0.base|) 0)) (= main_~len~0 2) (not (= (select (select |#memory_int| main_~ptr~0.base) main_~ptr~0.offset) 1)) (= |#NULL.offset| 0) (or (not (= main_~ptr~0.offset 0)) (not (= main_~ptr~0.base 0))) (= (select (select |#memory_$Pointer$.offset| |main_~#s~0.base|) 0) main_~ptr~0.offset) (<= (+ |#StackHeapBarrier| 1) |main_~#s~0.base|) (= |#NULL.base| 0))' at error location [2023-04-01 04:54:15,929 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 04:54:15,929 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 04:54:15,929 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 25 [2023-04-01 04:54:15,930 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550307614] [2023-04-01 04:54:15,930 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 04:54:15,931 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-04-01 04:54:15,931 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 04:54:15,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-04-01 04:54:15,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=2049, Unknown=26, NotChecked=186, Total=2450 [2023-04-01 04:54:15,935 INFO L87 Difference]: Start difference. First operand 40 states and 46 transitions. Second operand has 25 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 19 states have internal predecessors, (32), 7 states have call successors, (9), 2 states have call predecessors, (9), 7 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2023-04-01 04:54:16,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 04:54:16,519 INFO L93 Difference]: Finished difference Result 45 states and 52 transitions. [2023-04-01 04:54:16,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-04-01 04:54:16,519 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 19 states have internal predecessors, (32), 7 states have call successors, (9), 2 states have call predecessors, (9), 7 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) Word has length 39 [2023-04-01 04:54:16,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 04:54:16,520 INFO L225 Difference]: With dead ends: 45 [2023-04-01 04:54:16,520 INFO L226 Difference]: Without dead ends: 36 [2023-04-01 04:54:16,522 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 751 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=226, Invalid=2725, Unknown=27, NotChecked=214, Total=3192 [2023-04-01 04:54:16,523 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 19 mSDsluCounter, 251 mSDsCounter, 0 mSdLazyCounter, 453 mSolverCounterSat, 8 mSolverCounterUnsat, 10 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 275 SdHoareTripleChecker+Invalid, 512 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 453 IncrementalHoareTripleChecker+Invalid, 10 IncrementalHoareTripleChecker+Unknown, 41 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-01 04:54:16,523 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 275 Invalid, 512 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 453 Invalid, 10 Unknown, 41 Unchecked, 0.4s Time] [2023-04-01 04:54:16,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-04-01 04:54:16,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2023-04-01 04:54:16,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 24 states have (on average 1.1666666666666667) internal successors, (28), 24 states have internal predecessors, (28), 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 04:54:16,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2023-04-01 04:54:16,529 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 39 [2023-04-01 04:54:16,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 04:54:16,529 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2023-04-01 04:54:16,529 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 19 states have internal predecessors, (32), 7 states have call successors, (9), 2 states have call predecessors, (9), 7 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2023-04-01 04:54:16,529 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2023-04-01 04:54:16,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-04-01 04:54:16,530 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:54:16,530 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 04:54:16,540 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 04:54:16,737 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2023-04-01 04:54:16,738 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:54:16,738 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:54:16,738 INFO L85 PathProgramCache]: Analyzing trace with hash 1502426713, now seen corresponding path program 1 times [2023-04-01 04:54:16,738 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:54:16,738 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [30256819] [2023-04-01 04:54:16,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:54:16,739 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:54:16,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:54:17,790 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 04:54:17,790 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:54:17,790 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [30256819] [2023-04-01 04:54:17,790 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [30256819] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 04:54:17,790 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [789597745] [2023-04-01 04:54:17,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:54:17,791 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 04:54:17,791 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 04:54:17,792 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 04:54:17,814 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 04:54:18,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:54:18,027 INFO L262 TraceCheckSpWp]: Trace formula consists of 473 conjuncts, 43 conjunts are in the unsatisfiable core [2023-04-01 04:54:18,034 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 04:54:18,228 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 04:54:18,292 WARN L861 $PredicateComparison]: unable to prove that (and (< |c_node_create_#res.base| |c_#StackHeapBarrier|) (exists ((v_ArrVal_712 (Array Int Int))) (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| |c_node_create_#res.base| v_ArrVal_712)))) is different from true [2023-04-01 04:54:18,299 WARN L861 $PredicateComparison]: unable to prove that (and (< |c_dll_append_#t~ret7.base| |c_#StackHeapBarrier|) (exists ((v_ArrVal_712 (Array Int Int))) (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| |c_dll_append_#t~ret7.base| v_ArrVal_712)))) is different from true [2023-04-01 04:54:18,305 WARN L861 $PredicateComparison]: unable to prove that (and (exists ((v_ArrVal_712 (Array Int Int))) (= (store |c_old(#memory_$Pointer$.base)| c_dll_append_~new_last~0.base v_ArrVal_712) |c_#memory_$Pointer$.base|)) (< c_dll_append_~new_last~0.base |c_#StackHeapBarrier|)) is different from true [2023-04-01 04:54:18,415 WARN L861 $PredicateComparison]: unable to prove that (exists ((dll_append_~new_last~0.base Int) (dll_append_~last~0.base Int) (dll_append_~last~0.offset Int)) (and (< dll_append_~new_last~0.base |c_#StackHeapBarrier|) (exists ((v_ArrVal_712 (Array Int Int)) (v_ArrVal_716 (Array Int Int))) (let ((.cse2 (store |c_old(#memory_$Pointer$.base)| dll_append_~new_last~0.base v_ArrVal_712))) (let ((.cse0 (select .cse2 dll_append_~last~0.base)) (.cse1 (+ dll_append_~last~0.offset 4))) (and (= (select .cse0 .cse1) 0) (= |c_#memory_$Pointer$.base| (store (store .cse2 dll_append_~last~0.base (store .cse0 .cse1 dll_append_~new_last~0.base)) dll_append_~new_last~0.base v_ArrVal_716)))))))) is different from true [2023-04-01 04:54:18,435 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:54:18,479 INFO L321 Elim1Store]: treesize reduction 59, result has 43.8 percent of original size [2023-04-01 04:54:18,479 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 81 treesize of output 130 [2023-04-01 04:54:18,488 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 37 [2023-04-01 04:54:18,615 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 67 treesize of output 35 [2023-04-01 04:54:18,662 INFO L321 Elim1Store]: treesize reduction 46, result has 47.1 percent of original size [2023-04-01 04:54:18,663 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 342 treesize of output 374 [2023-04-01 04:54:18,846 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 13 treesize of output 9 [2023-04-01 04:54:18,862 INFO L321 Elim1Store]: treesize reduction 83, result has 1.2 percent of original size [2023-04-01 04:54:18,862 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 170 treesize of output 1 [2023-04-01 04:54:18,865 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 16 treesize of output 8 [2023-04-01 04:54:18,867 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 1 not checked. [2023-04-01 04:54:18,868 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 04:54:18,957 WARN L839 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_729 (Array Int Int)) (v_dll_append_~last~0.offset_8 Int) (v_dll_append_~last~0.base_8 Int) (v_dll_append_~new_last~0.base_12 Int) (v_ArrVal_730 (Array Int Int))) (let ((.cse0 (store |c_#memory_$Pointer$.base| v_dll_append_~new_last~0.base_12 v_ArrVal_729))) (let ((.cse1 (select .cse0 v_dll_append_~last~0.base_8)) (.cse2 (+ v_dll_append_~last~0.offset_8 4))) (or (not (= (select (select (store (store .cse0 v_dll_append_~last~0.base_8 (store .cse1 .cse2 v_dll_append_~new_last~0.base_12)) v_dll_append_~new_last~0.base_12 v_ArrVal_730) |c_main_~#s~0.base|) |c_main_~#s~0.offset|) 0)) (not (= (select .cse1 .cse2) 0)) (<= |c_#StackHeapBarrier| v_dll_append_~new_last~0.base_12))))) is different from false [2023-04-01 04:54:18,959 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [789597745] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 04:54:18,959 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [38691082] [2023-04-01 04:54:18,962 INFO L159 IcfgInterpreter]: Started Sifa with 31 locations of interest [2023-04-01 04:54:18,962 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 04:54:18,962 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 04:54:18,962 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 04:54:18,963 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 04:54:18,979 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-04-01 04:54:19,289 INFO L197 IcfgInterpreter]: Interpreting procedure dll_append with input of size 35 for LOIs [2023-04-01 04:54:19,461 INFO L197 IcfgInterpreter]: Interpreting procedure dll_create with input of size 44 for LOIs [2023-04-01 04:54:19,754 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 11 for LOIs [2023-04-01 04:54:19,765 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 04:54:19,768 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 04:54:26,945 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1224#(and (= main_~data~0 1) (<= 1 |#StackHeapBarrier|) (= |main_~#s~0.offset| 0) (= main_~count~0 0) (= main_~ptr~0.offset 0) (= (select (select |#memory_$Pointer$.offset| |main_~#s~0.base|) 0) 0) (= main_~len~0 2) (= main_~ptr~0.base 0) (= |#NULL.offset| 0) (<= (+ |#StackHeapBarrier| 1) |main_~#s~0.base|) (= (select (select |#memory_$Pointer$.base| |main_~#s~0.base|) 0) 0) (= |#NULL.base| 0))' at error location [2023-04-01 04:54:26,945 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 04:54:26,945 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 04:54:26,945 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 35 [2023-04-01 04:54:26,945 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777480903] [2023-04-01 04:54:26,946 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 04:54:26,946 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-04-01 04:54:26,946 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 04:54:26,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-04-01 04:54:26,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=2994, Unknown=11, NotChecked=570, Total=3782 [2023-04-01 04:54:26,948 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand has 35 states, 25 states have (on average 1.76) internal successors, (44), 27 states have internal predecessors, (44), 6 states have call successors, (8), 3 states have call predecessors, (8), 9 states have return successors, (10), 8 states have call predecessors, (10), 6 states have call successors, (10) [2023-04-01 04:54:30,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 04:54:30,493 INFO L93 Difference]: Finished difference Result 54 states and 61 transitions. [2023-04-01 04:54:30,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-04-01 04:54:30,494 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 25 states have (on average 1.76) internal successors, (44), 27 states have internal predecessors, (44), 6 states have call successors, (8), 3 states have call predecessors, (8), 9 states have return successors, (10), 8 states have call predecessors, (10), 6 states have call successors, (10) Word has length 42 [2023-04-01 04:54:30,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 04:54:30,495 INFO L225 Difference]: With dead ends: 54 [2023-04-01 04:54:30,495 INFO L226 Difference]: Without dead ends: 51 [2023-04-01 04:54:30,497 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 5 IntricatePredicates, 0 DeprecatedPredicates, 1174 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=308, Invalid=5247, Unknown=15, NotChecked=750, Total=6320 [2023-04-01 04:54:30,498 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 50 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 713 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 264 SdHoareTripleChecker+Invalid, 947 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 713 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 222 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2023-04-01 04:54:30,498 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 264 Invalid, 947 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 713 Invalid, 0 Unknown, 222 Unchecked, 1.6s Time] [2023-04-01 04:54:30,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2023-04-01 04:54:30,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 43. [2023-04-01 04:54:30,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 30 states have internal predecessors, (35), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2023-04-01 04:54:30,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2023-04-01 04:54:30,506 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 42 [2023-04-01 04:54:30,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 04:54:30,506 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2023-04-01 04:54:30,507 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 25 states have (on average 1.76) internal successors, (44), 27 states have internal predecessors, (44), 6 states have call successors, (8), 3 states have call predecessors, (8), 9 states have return successors, (10), 8 states have call predecessors, (10), 6 states have call successors, (10) [2023-04-01 04:54:30,507 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2023-04-01 04:54:30,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-04-01 04:54:30,508 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:54:30,508 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 04:54:30,516 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-01 04:54:30,713 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 04:54:30,713 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:54:30,713 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:54:30,713 INFO L85 PathProgramCache]: Analyzing trace with hash 1502358234, now seen corresponding path program 1 times [2023-04-01 04:54:30,714 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:54:30,714 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1480375738] [2023-04-01 04:54:30,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:54:30,714 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:54:30,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:54:34,962 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 04:54:34,962 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:54:34,962 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1480375738] [2023-04-01 04:54:34,962 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1480375738] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 04:54:34,962 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2055816341] [2023-04-01 04:54:34,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:54:34,963 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 04:54:34,963 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 04:54:34,963 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 04:54:34,965 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 04:54:35,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:54:35,637 INFO L262 TraceCheckSpWp]: Trace formula consists of 472 conjuncts, 98 conjunts are in the unsatisfiable core [2023-04-01 04:54:35,643 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 04:54:35,774 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-04-01 04:54:36,474 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2023-04-01 04:54:36,475 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 17 treesize of output 21 [2023-04-01 04:54:36,650 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2023-04-01 04:54:36,659 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 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 14 treesize of output 14 [2023-04-01 04:54:36,690 INFO L321 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-04-01 04:54:36,690 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 36 treesize of output 35 [2023-04-01 04:54:37,332 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 04:54:37,332 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 51 treesize of output 22 [2023-04-01 04:54:37,343 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 04:54:37,801 WARN L861 $PredicateComparison]: unable to prove that (exists ((node_create_~temp~0.base Int)) (and (< node_create_~temp~0.base |c_#StackHeapBarrier|) (= (select |c_old(#valid)| node_create_~temp~0.base) 0) (exists ((v_ArrVal_975 (Array Int Int))) (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| node_create_~temp~0.base v_ArrVal_975))) (exists ((v_ArrVal_976 (Array Int Int))) (= |c_#memory_$Pointer$.offset| (store |c_old(#memory_$Pointer$.offset)| node_create_~temp~0.base v_ArrVal_976))))) is different from true [2023-04-01 04:54:38,226 WARN L861 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_975 (Array Int Int)) (v_ArrVal_976 (Array Int Int)) (node_create_~temp~0.base Int)) (and (< node_create_~temp~0.base |c_#StackHeapBarrier|) (= (select |c_old(#valid)| node_create_~temp~0.base) 0) (= (select (let ((.cse0 (store |c_old(#memory_$Pointer$.base)| node_create_~temp~0.base v_ArrVal_975))) (select .cse0 (select (select .cse0 |c_dll_append_#in~head.base|) |c_dll_append_#in~head.offset|))) (+ (select (select (store |c_old(#memory_$Pointer$.offset)| node_create_~temp~0.base v_ArrVal_976) |c_dll_append_#in~head.base|) |c_dll_append_#in~head.offset|) 4)) |c_dll_append_#t~mem11.base|))) is different from true [2023-04-01 04:54:38,464 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2023-04-01 04:54:38,465 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 04:54:38,796 WARN L839 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_988 (Array Int Int)) (v_ArrVal_987 (Array Int Int)) (v_node_create_~temp~0.base_34 Int)) (or (not (= (select (let ((.cse0 (store |c_#memory_$Pointer$.base| v_node_create_~temp~0.base_34 v_ArrVal_987))) (select .cse0 (select (select .cse0 |c_main_~#s~0.base|) |c_main_~#s~0.offset|))) (+ 4 (select (select (store |c_#memory_$Pointer$.offset| v_node_create_~temp~0.base_34 v_ArrVal_988) |c_main_~#s~0.base|) |c_main_~#s~0.offset|))) 0)) (not (= (select |c_#valid| v_node_create_~temp~0.base_34) 0)) (<= |c_#StackHeapBarrier| v_node_create_~temp~0.base_34))) is different from false [2023-04-01 04:54:38,798 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2055816341] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 04:54:38,798 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [901027814] [2023-04-01 04:54:38,800 INFO L159 IcfgInterpreter]: Started Sifa with 31 locations of interest [2023-04-01 04:54:38,800 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 04:54:38,801 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 04:54:38,801 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 04:54:38,801 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 04:54:38,818 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-04-01 04:54:39,049 INFO L197 IcfgInterpreter]: Interpreting procedure dll_append with input of size 35 for LOIs [2023-04-01 04:54:39,252 INFO L197 IcfgInterpreter]: Interpreting procedure dll_create with input of size 44 for LOIs [2023-04-01 04:54:39,519 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 11 for LOIs [2023-04-01 04:54:39,532 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 04:54:39,536 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 04:54:51,208 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1613#(and (= main_~data~0 1) (<= 1 |#StackHeapBarrier|) (= |main_~#s~0.offset| 0) (= main_~count~0 0) (= main_~ptr~0.base (select (select |#memory_$Pointer$.base| |main_~#s~0.base|) 0)) (= main_~len~0 2) (not (= (select (select |#memory_int| main_~ptr~0.base) main_~ptr~0.offset) 1)) (= |#NULL.offset| 0) (or (not (= main_~ptr~0.offset 0)) (not (= main_~ptr~0.base 0))) (= (select (select |#memory_$Pointer$.offset| |main_~#s~0.base|) 0) main_~ptr~0.offset) (<= (+ |#StackHeapBarrier| 1) |main_~#s~0.base|) (= |#NULL.base| 0))' at error location [2023-04-01 04:54:51,209 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 04:54:51,209 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 04:54:51,209 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 23] total 47 [2023-04-01 04:54:51,209 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [244838082] [2023-04-01 04:54:51,209 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 04:54:51,209 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2023-04-01 04:54:51,209 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 04:54:51,210 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2023-04-01 04:54:51,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=270, Invalid=4842, Unknown=12, NotChecked=426, Total=5550 [2023-04-01 04:54:51,212 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand has 47 states, 33 states have (on average 1.696969696969697) internal successors, (56), 36 states have internal predecessors, (56), 10 states have call successors, (12), 4 states have call predecessors, (12), 11 states have return successors, (11), 11 states have call predecessors, (11), 10 states have call successors, (11) [2023-04-01 04:54:59,687 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 04:55:02,638 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 04:55:06,083 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 04:55:07,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 04:55:07,032 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2023-04-01 04:55:07,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-04-01 04:55:07,033 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 33 states have (on average 1.696969696969697) internal successors, (56), 36 states have internal predecessors, (56), 10 states have call successors, (12), 4 states have call predecessors, (12), 11 states have return successors, (11), 11 states have call predecessors, (11), 10 states have call successors, (11) Word has length 42 [2023-04-01 04:55:07,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 04:55:07,034 INFO L225 Difference]: With dead ends: 50 [2023-04-01 04:55:07,034 INFO L226 Difference]: Without dead ends: 40 [2023-04-01 04:55:07,036 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 2133 ImplicationChecksByTransitivity, 22.7s TimeCoverageRelationStatistics Valid=422, Invalid=7756, Unknown=24, NotChecked=540, Total=8742 [2023-04-01 04:55:07,037 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 37 mSDsluCounter, 344 mSDsCounter, 0 mSdLazyCounter, 965 mSolverCounterSat, 10 mSolverCounterUnsat, 11 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 365 SdHoareTripleChecker+Invalid, 1082 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 965 IncrementalHoareTripleChecker+Invalid, 11 IncrementalHoareTripleChecker+Unknown, 96 IncrementalHoareTripleChecker+Unchecked, 9.0s IncrementalHoareTripleChecker+Time [2023-04-01 04:55:07,037 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 365 Invalid, 1082 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 965 Invalid, 11 Unknown, 96 Unchecked, 9.0s Time] [2023-04-01 04:55:07,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2023-04-01 04:55:07,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 38. [2023-04-01 04:55:07,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 26 states have internal predecessors, (30), 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 04:55:07,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2023-04-01 04:55:07,045 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 42 [2023-04-01 04:55:07,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 04:55:07,045 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2023-04-01 04:55:07,045 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 33 states have (on average 1.696969696969697) internal successors, (56), 36 states have internal predecessors, (56), 10 states have call successors, (12), 4 states have call predecessors, (12), 11 states have return successors, (11), 11 states have call predecessors, (11), 10 states have call successors, (11) [2023-04-01 04:55:07,046 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2023-04-01 04:55:07,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2023-04-01 04:55:07,049 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:55:07,049 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 04:55:07,061 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-04-01 04:55:07,258 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 04:55:07,258 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:55:07,259 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:55:07,259 INFO L85 PathProgramCache]: Analyzing trace with hash 1504266676, now seen corresponding path program 1 times [2023-04-01 04:55:07,259 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:55:07,259 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2117724018] [2023-04-01 04:55:07,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:55:07,259 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:55:07,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat