/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_prepend_unequal.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 04:54:38,527 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 04:54:38,529 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 04:54:38,555 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 04:54:38,555 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 04:54:38,556 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 04:54:38,558 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 04:54:38,562 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 04:54:38,563 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 04:54:38,564 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 04:54:38,565 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 04:54:38,565 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 04:54:38,566 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 04:54:38,567 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 04:54:38,567 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 04:54:38,568 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 04:54:38,569 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 04:54:38,570 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 04:54:38,571 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 04:54:38,575 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 04:54:38,580 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 04:54:38,585 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 04:54:38,588 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 04:54:38,589 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 04:54:38,597 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 04:54:38,597 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 04:54:38,597 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 04:54:38,598 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 04:54:38,598 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 04:54:38,599 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 04:54:38,599 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 04:54:38,600 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 04:54:38,600 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 04:54:38,601 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 04:54:38,602 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 04:54:38,602 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 04:54:38,602 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 04:54:38,602 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 04:54:38,603 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 04:54:38,603 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 04:54:38,604 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 04:54:38,606 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 04:54:38,643 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 04:54:38,644 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 04:54:38,645 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 04:54:38,645 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 04:54:38,646 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 04:54:38,646 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 04:54:38,646 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 04:54:38,646 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 04:54:38,646 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 04:54:38,646 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 04:54:38,646 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 04:54:38,646 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 04:54:38,646 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 04:54:38,646 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 04:54:38,647 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 04:54:38,647 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 04:54:38,647 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 04:54:38,647 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 04:54:38,647 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 04:54:38,647 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 04:54:38,647 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 04:54:38,647 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 04:54:38,648 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 04:54:38,648 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 04:54:38,648 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 04:54:38,648 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 04:54:38,648 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 04:54:38,648 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 04:54:38,648 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 04:54:38,648 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 04:54:38,648 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 04:54:38,648 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 04:54:38,649 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 04:54:38,649 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 04:54:38,649 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 04:54:38,649 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 04:54:38,649 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 04:54:38,649 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 04:54:38,649 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 04:54:38,649 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 04:54:38,650 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 04:54:38,650 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-01 04:54:38,883 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 04:54:38,917 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 04:54:38,920 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 04:54:38,921 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 04:54:38,922 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 04:54:38,923 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/list-simple/dll2n_prepend_unequal.i [2023-04-01 04:54:40,097 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 04:54:40,363 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 04:54:40,363 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-simple/dll2n_prepend_unequal.i [2023-04-01 04:54:40,373 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2d6e860cd/a12b1a74aeb94122b25cd13f1cc69f6c/FLAG874847f09 [2023-04-01 04:54:40,384 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2d6e860cd/a12b1a74aeb94122b25cd13f1cc69f6c [2023-04-01 04:54:40,387 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 04:54:40,388 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 04:54:40,389 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 04:54:40,389 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 04:54:40,392 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 04:54:40,393 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 04:54:40" (1/1) ... [2023-04-01 04:54:40,394 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4bb9460c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:54:40, skipping insertion in model container [2023-04-01 04:54:40,394 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 04:54:40" (1/1) ... [2023-04-01 04:54:40,400 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 04:54:40,435 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 04:54:40,691 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_prepend_unequal.i[24450,24463] [2023-04-01 04:54:40,698 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 04:54:40,710 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 04:54:40,757 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_prepend_unequal.i[24450,24463] [2023-04-01 04:54:40,758 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 04:54:40,785 INFO L208 MainTranslator]: Completed translation [2023-04-01 04:54:40,786 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:54:40 WrapperNode [2023-04-01 04:54:40,786 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 04:54:40,787 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 04:54:40,787 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 04:54:40,787 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 04:54:40,798 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:54:40" (1/1) ... [2023-04-01 04:54:40,798 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:54:40" (1/1) ... [2023-04-01 04:54:40,809 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:54:40" (1/1) ... [2023-04-01 04:54:40,810 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:54:40" (1/1) ... [2023-04-01 04:54:40,824 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:54:40" (1/1) ... [2023-04-01 04:54:40,828 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:54:40" (1/1) ... [2023-04-01 04:54:40,831 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:54:40" (1/1) ... [2023-04-01 04:54:40,832 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:54:40" (1/1) ... [2023-04-01 04:54:40,838 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 04:54:40,839 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 04:54:40,839 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 04:54:40,839 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 04:54:40,840 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:54:40" (1/1) ... [2023-04-01 04:54:40,845 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 04:54:40,857 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 04:54:40,874 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 04:54:40,891 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 04:54:40,918 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 04:54:40,919 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 04:54:40,919 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 04:54:40,919 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2023-04-01 04:54:40,923 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2023-04-01 04:54:40,924 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2023-04-01 04:54:40,924 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-04-01 04:54:40,924 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_create [2023-04-01 04:54:40,924 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_destroy [2023-04-01 04:54:40,925 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_prepend [2023-04-01 04:54:40,925 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 04:54:40,925 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 04:54:40,925 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 04:54:40,925 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-04-01 04:54:40,925 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-04-01 04:54:40,926 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 04:54:40,926 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 04:54:40,926 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2023-04-01 04:54:40,926 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2023-04-01 04:54:40,926 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2023-04-01 04:54:40,926 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2023-04-01 04:54:40,926 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2023-04-01 04:54:40,926 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2023-04-01 04:54:40,926 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2023-04-01 04:54:40,926 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2023-04-01 04:54:40,927 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2023-04-01 04:54:40,927 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2023-04-01 04:54:40,927 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2023-04-01 04:54:40,927 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2023-04-01 04:54:40,928 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2023-04-01 04:54:40,928 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2023-04-01 04:54:40,928 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2023-04-01 04:54:40,928 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2023-04-01 04:54:40,928 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2023-04-01 04:54:40,928 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2023-04-01 04:54:40,928 INFO L130 BoogieDeclarations]: Found specification of procedure select [2023-04-01 04:54:40,929 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2023-04-01 04:54:40,929 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2023-04-01 04:54:40,929 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2023-04-01 04:54:40,929 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2023-04-01 04:54:40,929 INFO L130 BoogieDeclarations]: Found specification of procedure random [2023-04-01 04:54:40,929 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2023-04-01 04:54:40,929 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2023-04-01 04:54:40,930 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2023-04-01 04:54:40,930 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2023-04-01 04:54:40,930 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2023-04-01 04:54:40,931 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2023-04-01 04:54:40,931 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2023-04-01 04:54:40,931 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2023-04-01 04:54:40,931 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2023-04-01 04:54:40,931 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2023-04-01 04:54:40,931 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2023-04-01 04:54:40,931 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2023-04-01 04:54:40,931 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2023-04-01 04:54:40,931 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2023-04-01 04:54:40,932 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2023-04-01 04:54:40,932 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2023-04-01 04:54:40,932 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2023-04-01 04:54:40,932 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2023-04-01 04:54:40,932 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2023-04-01 04:54:40,932 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2023-04-01 04:54:40,932 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2023-04-01 04:54:40,932 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2023-04-01 04:54:40,932 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2023-04-01 04:54:40,933 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2023-04-01 04:54:40,933 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2023-04-01 04:54:40,933 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2023-04-01 04:54:40,933 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2023-04-01 04:54:40,933 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2023-04-01 04:54:40,933 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2023-04-01 04:54:40,933 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2023-04-01 04:54:40,933 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2023-04-01 04:54:40,934 INFO L130 BoogieDeclarations]: Found specification of procedure free [2023-04-01 04:54:40,934 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2023-04-01 04:54:40,934 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2023-04-01 04:54:40,934 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2023-04-01 04:54:40,934 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2023-04-01 04:54:40,934 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2023-04-01 04:54:40,934 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2023-04-01 04:54:40,934 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2023-04-01 04:54:40,934 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2023-04-01 04:54:40,934 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2023-04-01 04:54:40,934 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2023-04-01 04:54:40,934 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2023-04-01 04:54:40,934 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2023-04-01 04:54:40,934 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2023-04-01 04:54:40,934 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2023-04-01 04:54:40,935 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2023-04-01 04:54:40,935 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2023-04-01 04:54:40,935 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2023-04-01 04:54:40,935 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2023-04-01 04:54:40,935 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2023-04-01 04:54:40,935 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2023-04-01 04:54:40,935 INFO L130 BoogieDeclarations]: Found specification of procedure system [2023-04-01 04:54:40,935 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2023-04-01 04:54:40,935 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2023-04-01 04:54:40,935 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2023-04-01 04:54:40,935 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2023-04-01 04:54:40,935 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2023-04-01 04:54:40,935 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2023-04-01 04:54:40,935 INFO L130 BoogieDeclarations]: Found specification of procedure div [2023-04-01 04:54:40,936 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2023-04-01 04:54:40,936 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2023-04-01 04:54:40,936 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2023-04-01 04:54:40,936 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2023-04-01 04:54:40,936 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2023-04-01 04:54:40,936 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2023-04-01 04:54:40,936 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2023-04-01 04:54:40,936 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2023-04-01 04:54:40,936 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2023-04-01 04:54:40,936 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2023-04-01 04:54:40,936 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2023-04-01 04:54:40,936 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2023-04-01 04:54:40,936 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2023-04-01 04:54:40,936 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2023-04-01 04:54:40,937 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2023-04-01 04:54:40,937 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2023-04-01 04:54:40,937 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2023-04-01 04:54:40,937 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2023-04-01 04:54:40,937 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2023-04-01 04:54:40,937 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2023-04-01 04:54:40,937 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2023-04-01 04:54:40,937 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-04-01 04:54:40,937 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-04-01 04:54:40,938 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-04-01 04:54:40,938 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 04:54:40,938 INFO L130 BoogieDeclarations]: Found specification of procedure dll_create [2023-04-01 04:54:40,938 INFO L130 BoogieDeclarations]: Found specification of procedure dll_destroy [2023-04-01 04:54:40,938 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-04-01 04:54:40,938 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 04:54:40,938 INFO L130 BoogieDeclarations]: Found specification of procedure dll_prepend [2023-04-01 04:54:40,938 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 04:54:40,938 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-01 04:54:40,938 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-04-01 04:54:40,939 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 04:54:40,939 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 04:54:40,939 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 04:54:40,939 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 04:54:41,190 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 04:54:41,191 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 04:54:41,242 INFO L771 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2023-04-01 04:54:41,393 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 04:54:41,491 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 04:54:41,491 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-04-01 04:54:41,493 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 04:54:41 BoogieIcfgContainer [2023-04-01 04:54:41,494 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 04:54:41,524 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 04:54:41,525 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 04:54:41,527 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 04:54:41,527 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 04:54:40" (1/3) ... [2023-04-01 04:54:41,528 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8a1f280 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 04:54:41, skipping insertion in model container [2023-04-01 04:54:41,528 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:54:40" (2/3) ... [2023-04-01 04:54:41,528 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8a1f280 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 04:54:41, skipping insertion in model container [2023-04-01 04:54:41,528 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 04:54:41" (3/3) ... [2023-04-01 04:54:41,530 INFO L112 eAbstractionObserver]: Analyzing ICFG dll2n_prepend_unequal.i [2023-04-01 04:54:41,546 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 04:54:41,546 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 04:54:41,599 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 04:54:41,606 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;@6a656205, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 04:54:41,606 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 04:54:41,610 INFO L276 IsEmpty]: Start isEmpty. Operand has 41 states, 25 states have (on average 1.36) internal successors, (34), 27 states have internal predecessors, (34), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-01 04:54:41,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-04-01 04:54:41,617 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:54:41,618 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] [2023-04-01 04:54:41,618 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:54:41,624 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:54:41,625 INFO L85 PathProgramCache]: Analyzing trace with hash 2120952381, now seen corresponding path program 1 times [2023-04-01 04:54:41,633 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:54:41,634 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928406445] [2023-04-01 04:54:41,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:54:41,634 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:54:41,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:54:42,074 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 04:54:42,075 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:54:42,075 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [928406445] [2023-04-01 04:54:42,075 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [928406445] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 04:54:42,076 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 04:54:42,076 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-01 04:54:42,077 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125394639] [2023-04-01 04:54:42,078 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 04:54:42,081 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-01 04:54:42,082 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 04:54:42,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-01 04:54:42,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-01 04:54:42,120 INFO L87 Difference]: Start difference. First operand has 41 states, 25 states have (on average 1.36) internal successors, (34), 27 states have internal predecessors, (34), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 5 states, 3 states have (on average 4.333333333333333) internal successors, (13), 5 states have internal predecessors, (13), 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 04:54:42,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 04:54:42,271 INFO L93 Difference]: Finished difference Result 75 states and 89 transitions. [2023-04-01 04:54:42,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-04-01 04:54:42,273 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 4.333333333333333) internal successors, (13), 5 states have internal predecessors, (13), 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 22 [2023-04-01 04:54:42,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 04:54:42,279 INFO L225 Difference]: With dead ends: 75 [2023-04-01 04:54:42,279 INFO L226 Difference]: Without dead ends: 31 [2023-04-01 04:54:42,282 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 04:54:42,288 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 17 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 04:54:42,289 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 129 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 04:54:42,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-04-01 04:54:42,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2023-04-01 04:54:42,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 19 states have internal predecessors, (23), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 04:54:42,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2023-04-01 04:54:42,326 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 22 [2023-04-01 04:54:42,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 04:54:42,327 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2023-04-01 04:54:42,327 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 4.333333333333333) internal successors, (13), 5 states have internal predecessors, (13), 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 04:54:42,328 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2023-04-01 04:54:42,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-04-01 04:54:42,329 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:54:42,329 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 04:54:42,329 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 04:54:42,330 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:54:42,331 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:54:42,332 INFO L85 PathProgramCache]: Analyzing trace with hash 1247330884, now seen corresponding path program 1 times [2023-04-01 04:54:42,332 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:54:42,332 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1562699451] [2023-04-01 04:54:42,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:54:42,332 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:54:42,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:54:42,606 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 04:54:42,606 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:54:42,606 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1562699451] [2023-04-01 04:54:42,606 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1562699451] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 04:54:42,607 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1833811954] [2023-04-01 04:54:42,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:54:42,607 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 04:54:42,607 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 04:54:42,615 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 04:54:42,633 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 04:54:42,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:54:42,889 INFO L262 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 5 conjunts are in the unsatisfiable core [2023-04-01 04:54:42,894 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 04:54:42,970 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 04:54:42,970 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 04:54:43,092 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 04:54:43,095 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1833811954] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 04:54:43,096 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1247369354] [2023-04-01 04:54:43,116 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-04-01 04:54:43,117 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 04:54:43,120 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 04:54:43,124 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 04:54:43,125 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 04:54:43,212 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-04-01 04:54:43,888 INFO L197 IcfgInterpreter]: Interpreting procedure dll_prepend with input of size 40 for LOIs [2023-04-01 04:54:44,123 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 40 for LOIs [2023-04-01 04:54:44,157 INFO L197 IcfgInterpreter]: Interpreting procedure dll_create with input of size 44 for LOIs [2023-04-01 04:54:44,374 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 04:54:44,378 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 04:54:46,337 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '362#(and (= main_~data~0 1) (<= 1 |#StackHeapBarrier|) (= |main_~#s~0.offset| 0) (= main_~ptr~0.base (select (select |#memory_$Pointer$.base| |main_~#s~0.base|) 0)) (= main_~len~0 2) (= |#NULL.offset| 0) (= 5 main_~uneq~0) (= (select (select |#memory_$Pointer$.offset| |main_~#s~0.base|) 0) main_~ptr~0.offset) (<= (+ |#StackHeapBarrier| 1) |main_~#s~0.base|) (not (= (select (select |#memory_int| main_~ptr~0.base) main_~ptr~0.offset) 5)) (= |#NULL.base| 0))' at error location [2023-04-01 04:54:46,338 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 04:54:46,338 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 04:54:46,338 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-04-01 04:54:46,339 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939246597] [2023-04-01 04:54:46,339 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 04:54:46,339 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-04-01 04:54:46,340 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 04:54:46,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-04-01 04:54:46,342 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=993, Unknown=0, NotChecked=0, Total=1122 [2023-04-01 04:54:46,342 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand has 12 states, 8 states have (on average 4.0) internal successors, (32), 12 states have internal predecessors, (32), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 2 states have call predecessors, (7), 4 states have call successors, (7) [2023-04-01 04:54:46,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 04:54:46,507 INFO L93 Difference]: Finished difference Result 52 states and 58 transitions. [2023-04-01 04:54:46,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-01 04:54:46,507 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 8 states have (on average 4.0) internal successors, (32), 12 states have internal predecessors, (32), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 2 states have call predecessors, (7), 4 states have call successors, (7) Word has length 25 [2023-04-01 04:54:46,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 04:54:46,508 INFO L225 Difference]: With dead ends: 52 [2023-04-01 04:54:46,508 INFO L226 Difference]: Without dead ends: 34 [2023-04-01 04:54:46,509 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=145, Invalid=1115, Unknown=0, NotChecked=0, Total=1260 [2023-04-01 04:54:46,510 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 15 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 04:54:46,510 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 128 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 04:54:46,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-04-01 04:54:46,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2023-04-01 04:54:46,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 22 states have internal predecessors, (26), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 04:54:46,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2023-04-01 04:54:46,517 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 25 [2023-04-01 04:54:46,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 04:54:46,518 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2023-04-01 04:54:46,518 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 8 states have (on average 4.0) internal successors, (32), 12 states have internal predecessors, (32), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 2 states have call predecessors, (7), 4 states have call successors, (7) [2023-04-01 04:54:46,518 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2023-04-01 04:54:46,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-04-01 04:54:46,519 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:54:46,519 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] [2023-04-01 04:54:46,529 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 04:54:46,721 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 04:54:46,721 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:54:46,722 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:54:46,722 INFO L85 PathProgramCache]: Analyzing trace with hash -1603839779, now seen corresponding path program 2 times [2023-04-01 04:54:46,722 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:54:46,722 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [314380392] [2023-04-01 04:54:46,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:54:46,722 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:54:46,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:54:48,458 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 04:54:48,459 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:54:48,459 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [314380392] [2023-04-01 04:54:48,459 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [314380392] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 04:54:48,459 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 04:54:48,459 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2023-04-01 04:54:48,459 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1299232071] [2023-04-01 04:54:48,459 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 04:54:48,460 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-04-01 04:54:48,460 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 04:54:48,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-04-01 04:54:48,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2023-04-01 04:54:48,461 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand has 16 states, 10 states have (on average 1.9) internal successors, (19), 12 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 04:54:48,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 04:54:48,897 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2023-04-01 04:54:48,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-04-01 04:54:48,905 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 10 states have (on average 1.9) internal successors, (19), 12 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 28 [2023-04-01 04:54:48,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 04:54:48,907 INFO L225 Difference]: With dead ends: 34 [2023-04-01 04:54:48,907 INFO L226 Difference]: Without dead ends: 32 [2023-04-01 04:54:48,908 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=55, Invalid=365, Unknown=0, NotChecked=0, Total=420 [2023-04-01 04:54:48,909 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 23 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 305 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 310 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 305 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-01 04:54:48,909 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 97 Invalid, 310 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 305 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-01 04:54:48,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-04-01 04:54:48,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2023-04-01 04:54:48,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 states have internal predecessors, (25), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 04:54:48,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2023-04-01 04:54:48,915 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 28 [2023-04-01 04:54:48,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 04:54:48,915 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2023-04-01 04:54:48,915 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 10 states have (on average 1.9) internal successors, (19), 12 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 04:54:48,916 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2023-04-01 04:54:48,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-04-01 04:54:48,916 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:54:48,916 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 04:54:48,917 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-04-01 04:54:48,917 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:54:48,917 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:54:48,917 INFO L85 PathProgramCache]: Analyzing trace with hash 603363593, now seen corresponding path program 1 times [2023-04-01 04:54:48,917 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:54:48,917 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1483029171] [2023-04-01 04:54:48,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:54:48,918 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:54:48,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:54:50,118 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 04:54:50,118 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:54:50,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1483029171] [2023-04-01 04:54:50,119 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1483029171] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 04:54:50,119 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 04:54:50,119 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2023-04-01 04:54:50,119 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998468621] [2023-04-01 04:54:50,119 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 04:54:50,119 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-04-01 04:54:50,120 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 04:54:50,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-04-01 04:54:50,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=239, Unknown=0, NotChecked=0, Total=272 [2023-04-01 04:54:50,121 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand has 17 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 13 states have internal predecessors, (21), 4 states have call successors, (5), 2 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 04:54:50,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 04:54:50,563 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2023-04-01 04:54:50,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-04-01 04:54:50,564 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 13 states have internal predecessors, (21), 4 states have call successors, (5), 2 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 30 [2023-04-01 04:54:50,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 04:54:50,565 INFO L225 Difference]: With dead ends: 39 [2023-04-01 04:54:50,565 INFO L226 Difference]: Without dead ends: 36 [2023-04-01 04:54:50,566 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2023-04-01 04:54:50,568 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 34 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 327 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-01 04:54:50,572 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 107 Invalid, 332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 327 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-01 04:54:50,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-04-01 04:54:50,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 33. [2023-04-01 04:54:50,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 states have internal predecessors, (26), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 04:54:50,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2023-04-01 04:54:50,589 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 30 [2023-04-01 04:54:50,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 04:54:50,589 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2023-04-01 04:54:50,590 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 13 states have internal predecessors, (21), 4 states have call successors, (5), 2 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 04:54:50,590 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2023-04-01 04:54:50,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-04-01 04:54:50,591 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:54:50,591 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 04:54:50,592 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-04-01 04:54:50,592 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:54:50,593 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:54:50,593 INFO L85 PathProgramCache]: Analyzing trace with hash 603277816, now seen corresponding path program 1 times [2023-04-01 04:54:50,593 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:54:50,593 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [82257394] [2023-04-01 04:54:50,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:54:50,594 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:54:50,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:54:53,314 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 04:54:53,314 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:54:53,314 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [82257394] [2023-04-01 04:54:53,314 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [82257394] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 04:54:53,314 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1053907163] [2023-04-01 04:54:53,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:54:53,315 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 04:54:53,315 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 04:54:53,316 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 04:54:53,320 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 04:54:53,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:54:53,538 INFO L262 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 148 conjunts are in the unsatisfiable core [2023-04-01 04:54:53,550 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 04:54:53,578 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-04-01 04:54:53,619 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-04-01 04:54:53,823 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 28 [2023-04-01 04:54:53,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:54:53,832 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2023-04-01 04:54:53,839 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:54:53,840 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2023-04-01 04:54:53,847 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:54:53,848 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2023-04-01 04:54:54,050 INFO L321 Elim1Store]: treesize reduction 48, result has 23.8 percent of original size [2023-04-01 04:54:54,051 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 30 [2023-04-01 04:54:54,240 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 45 treesize of output 25 [2023-04-01 04:54:54,250 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-04-01 04:54:54,250 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 10 [2023-04-01 04:54:54,258 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3