/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/heap-data/process_queue.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 04:56:43,851 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 04:56:43,853 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 04:56:43,872 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 04:56:43,872 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 04:56:43,873 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 04:56:43,874 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 04:56:43,875 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 04:56:43,876 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 04:56:43,877 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 04:56:43,877 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 04:56:43,878 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 04:56:43,878 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 04:56:43,879 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 04:56:43,880 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 04:56:43,881 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 04:56:43,881 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 04:56:43,882 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 04:56:43,883 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 04:56:43,885 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 04:56:43,886 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 04:56:43,886 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 04:56:43,887 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 04:56:43,888 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 04:56:43,890 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 04:56:43,890 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 04:56:43,890 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 04:56:43,891 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 04:56:43,891 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 04:56:43,892 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 04:56:43,892 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 04:56:43,893 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 04:56:43,893 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 04:56:43,894 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 04:56:43,894 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 04:56:43,895 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 04:56:43,895 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 04:56:43,895 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 04:56:43,895 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 04:56:43,896 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 04:56:43,897 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 04:56:43,897 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 04:56:43,912 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 04:56:43,913 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 04:56:43,913 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 04:56:43,913 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 04:56:43,914 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 04:56:43,914 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 04:56:43,914 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 04:56:43,914 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 04:56:43,914 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 04:56:43,914 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 04:56:43,915 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 04:56:43,915 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 04:56:43,915 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 04:56:43,915 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 04:56:43,915 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 04:56:43,915 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 04:56:43,915 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 04:56:43,915 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 04:56:43,916 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 04:56:43,916 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 04:56:43,916 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 04:56:43,916 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 04:56:43,916 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 04:56:43,917 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 04:56:43,917 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 04:56:43,917 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 04:56:43,917 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 04:56:43,917 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 04:56:43,917 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 04:56:43,917 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 04:56:43,917 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 04:56:43,918 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 04:56:43,918 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 04:56:43,918 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 04:56:43,918 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 04:56:43,918 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 04:56:43,918 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 04:56:43,918 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 04:56:43,919 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 04:56:43,919 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 04:56:43,919 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 04:56:43,919 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-01 04:56:44,128 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 04:56:44,153 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 04:56:44,155 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 04:56:44,155 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 04:56:44,156 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 04:56:44,157 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/heap-data/process_queue.i [2023-04-01 04:56:45,187 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 04:56:45,444 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 04:56:45,445 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/heap-data/process_queue.i [2023-04-01 04:56:45,458 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e226a2a08/f64011b18df4417e8370a280013d3df6/FLAG8e18eef97 [2023-04-01 04:56:45,469 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e226a2a08/f64011b18df4417e8370a280013d3df6 [2023-04-01 04:56:45,471 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 04:56:45,472 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 04:56:45,473 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 04:56:45,473 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 04:56:45,488 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 04:56:45,488 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 04:56:45" (1/1) ... [2023-04-01 04:56:45,489 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@13ee1f0f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:56:45, skipping insertion in model container [2023-04-01 04:56:45,489 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 04:56:45" (1/1) ... [2023-04-01 04:56:45,494 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 04:56:45,515 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 04:56:45,769 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/heap-data/process_queue.i[23979,23992] [2023-04-01 04:56:45,775 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 04:56:45,780 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 04:56:45,803 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/heap-data/process_queue.i[23979,23992] [2023-04-01 04:56:45,805 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 04:56:45,822 INFO L208 MainTranslator]: Completed translation [2023-04-01 04:56:45,823 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:56:45 WrapperNode [2023-04-01 04:56:45,823 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 04:56:45,824 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 04:56:45,824 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 04:56:45,824 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 04:56:45,830 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:56:45" (1/1) ... [2023-04-01 04:56:45,831 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:56:45" (1/1) ... [2023-04-01 04:56:45,845 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:56:45" (1/1) ... [2023-04-01 04:56:45,845 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:56:45" (1/1) ... [2023-04-01 04:56:45,854 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:56:45" (1/1) ... [2023-04-01 04:56:45,862 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:56:45" (1/1) ... [2023-04-01 04:56:45,873 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:56:45" (1/1) ... [2023-04-01 04:56:45,874 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:56:45" (1/1) ... [2023-04-01 04:56:45,878 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 04:56:45,878 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 04:56:45,878 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 04:56:45,879 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 04:56:45,879 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:56:45" (1/1) ... [2023-04-01 04:56:45,887 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 04:56:45,894 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 04:56:45,911 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 04:56:45,925 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 04:56:45,955 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 04:56:45,955 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 04:56:45,955 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 04:56:45,955 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2023-04-01 04:56:45,955 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2023-04-01 04:56:45,955 INFO L138 BoogieDeclarations]: Found implementation of procedure run_process [2023-04-01 04:56:45,956 INFO L138 BoogieDeclarations]: Found implementation of procedure append_to_queue [2023-04-01 04:56:45,956 INFO L138 BoogieDeclarations]: Found implementation of procedure choose_next [2023-04-01 04:56:45,956 INFO L138 BoogieDeclarations]: Found implementation of procedure check_queue [2023-04-01 04:56:45,956 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 04:56:45,956 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 04:56:45,956 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 04:56:45,956 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 04:56:45,956 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-04-01 04:56:45,956 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-04-01 04:56:45,956 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 04:56:45,956 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 04:56:45,957 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2023-04-01 04:56:45,957 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2023-04-01 04:56:45,957 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2023-04-01 04:56:45,957 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2023-04-01 04:56:45,957 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2023-04-01 04:56:45,957 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2023-04-01 04:56:45,957 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2023-04-01 04:56:45,957 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2023-04-01 04:56:45,957 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2023-04-01 04:56:45,957 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2023-04-01 04:56:45,957 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2023-04-01 04:56:45,958 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2023-04-01 04:56:45,958 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2023-04-01 04:56:45,958 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2023-04-01 04:56:45,958 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2023-04-01 04:56:45,958 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2023-04-01 04:56:45,958 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2023-04-01 04:56:45,958 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2023-04-01 04:56:45,958 INFO L130 BoogieDeclarations]: Found specification of procedure select [2023-04-01 04:56:45,958 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2023-04-01 04:56:45,958 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2023-04-01 04:56:45,958 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2023-04-01 04:56:45,958 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2023-04-01 04:56:45,959 INFO L130 BoogieDeclarations]: Found specification of procedure random [2023-04-01 04:56:45,959 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2023-04-01 04:56:45,959 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2023-04-01 04:56:45,959 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2023-04-01 04:56:45,959 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2023-04-01 04:56:45,959 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2023-04-01 04:56:45,959 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2023-04-01 04:56:45,959 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2023-04-01 04:56:45,959 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2023-04-01 04:56:45,959 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2023-04-01 04:56:45,960 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2023-04-01 04:56:45,960 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2023-04-01 04:56:45,960 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2023-04-01 04:56:45,960 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2023-04-01 04:56:45,960 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2023-04-01 04:56:45,960 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2023-04-01 04:56:45,960 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2023-04-01 04:56:45,960 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2023-04-01 04:56:45,960 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2023-04-01 04:56:45,960 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2023-04-01 04:56:45,960 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2023-04-01 04:56:45,961 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2023-04-01 04:56:45,961 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2023-04-01 04:56:45,961 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2023-04-01 04:56:45,961 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2023-04-01 04:56:45,961 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2023-04-01 04:56:45,961 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2023-04-01 04:56:45,961 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2023-04-01 04:56:45,961 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2023-04-01 04:56:45,961 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2023-04-01 04:56:45,961 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2023-04-01 04:56:45,961 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2023-04-01 04:56:45,961 INFO L130 BoogieDeclarations]: Found specification of procedure free [2023-04-01 04:56:45,961 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2023-04-01 04:56:45,962 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2023-04-01 04:56:45,962 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2023-04-01 04:56:45,962 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2023-04-01 04:56:45,962 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2023-04-01 04:56:45,962 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2023-04-01 04:56:45,962 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2023-04-01 04:56:45,962 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2023-04-01 04:56:45,962 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2023-04-01 04:56:45,962 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2023-04-01 04:56:45,962 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2023-04-01 04:56:45,962 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2023-04-01 04:56:45,962 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2023-04-01 04:56:45,962 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2023-04-01 04:56:45,962 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2023-04-01 04:56:45,963 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2023-04-01 04:56:45,963 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2023-04-01 04:56:45,963 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2023-04-01 04:56:45,963 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2023-04-01 04:56:45,963 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2023-04-01 04:56:45,963 INFO L130 BoogieDeclarations]: Found specification of procedure system [2023-04-01 04:56:45,963 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2023-04-01 04:56:45,963 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2023-04-01 04:56:45,963 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2023-04-01 04:56:45,963 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2023-04-01 04:56:45,963 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2023-04-01 04:56:45,963 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2023-04-01 04:56:45,963 INFO L130 BoogieDeclarations]: Found specification of procedure div [2023-04-01 04:56:45,964 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2023-04-01 04:56:45,964 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2023-04-01 04:56:45,964 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2023-04-01 04:56:45,964 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2023-04-01 04:56:45,964 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2023-04-01 04:56:45,964 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2023-04-01 04:56:45,964 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2023-04-01 04:56:45,964 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2023-04-01 04:56:45,964 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2023-04-01 04:56:45,964 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2023-04-01 04:56:45,964 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2023-04-01 04:56:45,964 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2023-04-01 04:56:45,964 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2023-04-01 04:56:45,965 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2023-04-01 04:56:45,965 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2023-04-01 04:56:45,965 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2023-04-01 04:56:45,965 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2023-04-01 04:56:45,965 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2023-04-01 04:56:45,965 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2023-04-01 04:56:45,965 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2023-04-01 04:56:45,965 INFO L130 BoogieDeclarations]: Found specification of procedure run_process [2023-04-01 04:56:45,965 INFO L130 BoogieDeclarations]: Found specification of procedure append_to_queue [2023-04-01 04:56:45,965 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-04-01 04:56:45,965 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-04-01 04:56:45,966 INFO L130 BoogieDeclarations]: Found specification of procedure choose_next [2023-04-01 04:56:45,966 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 04:56:45,966 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 04:56:45,966 INFO L130 BoogieDeclarations]: Found specification of procedure check_queue [2023-04-01 04:56:45,966 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 04:56:45,966 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-01 04:56:45,966 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-04-01 04:56:45,966 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-04-01 04:56:45,966 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 04:56:45,966 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 04:56:45,966 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 04:56:45,966 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 04:56:46,164 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 04:56:46,166 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 04:56:46,340 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 04:56:46,390 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 04:56:46,390 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-04-01 04:56:46,392 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 04:56:46 BoogieIcfgContainer [2023-04-01 04:56:46,392 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 04:56:46,393 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 04:56:46,393 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 04:56:46,396 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 04:56:46,396 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 04:56:45" (1/3) ... [2023-04-01 04:56:46,397 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b1fcd3a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 04:56:46, skipping insertion in model container [2023-04-01 04:56:46,397 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:56:45" (2/3) ... [2023-04-01 04:56:46,397 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b1fcd3a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 04:56:46, skipping insertion in model container [2023-04-01 04:56:46,397 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 04:56:46" (3/3) ... [2023-04-01 04:56:46,401 INFO L112 eAbstractionObserver]: Analyzing ICFG process_queue.i [2023-04-01 04:56:46,412 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 04:56:46,412 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 04:56:46,441 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 04:56:46,446 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;@3d6df4fc, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 04:56:46,446 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 04:56:46,449 INFO L276 IsEmpty]: Start isEmpty. Operand has 35 states, 21 states have (on average 1.380952380952381) internal successors, (29), 23 states have internal predecessors, (29), 6 states have call successors, (6), 6 states have call predecessors, (6), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-01 04:56:46,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-04-01 04:56:46,455 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:56:46,455 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 04:56:46,456 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting check_queueErr0ASSERT_VIOLATIONERROR_FUNCTION === [check_queueErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:56:46,461 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:56:46,461 INFO L85 PathProgramCache]: Analyzing trace with hash 1490855743, now seen corresponding path program 1 times [2023-04-01 04:56:46,468 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:56:46,468 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [178913210] [2023-04-01 04:56:46,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:56:46,468 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:56:46,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:56:46,836 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 04:56:46,836 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:56:46,836 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [178913210] [2023-04-01 04:56:46,837 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [178913210] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 04:56:46,837 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 04:56:46,838 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-04-01 04:56:46,839 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282829361] [2023-04-01 04:56:46,839 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 04:56:46,842 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-04-01 04:56:46,842 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 04:56:46,875 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-04-01 04:56:46,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-04-01 04:56:46,878 INFO L87 Difference]: Start difference. First operand has 35 states, 21 states have (on average 1.380952380952381) internal successors, (29), 23 states have internal predecessors, (29), 6 states have call successors, (6), 6 states have call predecessors, (6), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 04:56:47,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 04:56:47,128 INFO L93 Difference]: Finished difference Result 77 states and 97 transitions. [2023-04-01 04:56:47,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-01 04:56:47,130 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2023-04-01 04:56:47,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 04:56:47,136 INFO L225 Difference]: With dead ends: 77 [2023-04-01 04:56:47,136 INFO L226 Difference]: Without dead ends: 42 [2023-04-01 04:56:47,139 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-04-01 04:56:47,143 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 7 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 04:56:47,143 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 121 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 04:56:47,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2023-04-01 04:56:47,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2023-04-01 04:56:47,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 27 states have (on average 1.2592592592592593) internal successors, (34), 28 states have internal predecessors, (34), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-01 04:56:47,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 47 transitions. [2023-04-01 04:56:47,179 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 47 transitions. Word has length 15 [2023-04-01 04:56:47,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 04:56:47,179 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 47 transitions. [2023-04-01 04:56:47,180 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 04:56:47,180 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 47 transitions. [2023-04-01 04:56:47,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-04-01 04:56:47,181 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:56:47,181 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 04:56:47,181 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 04:56:47,181 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting check_queueErr0ASSERT_VIOLATIONERROR_FUNCTION === [check_queueErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:56:47,182 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:56:47,182 INFO L85 PathProgramCache]: Analyzing trace with hash -2052782366, now seen corresponding path program 1 times [2023-04-01 04:56:47,182 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:56:47,182 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1392424068] [2023-04-01 04:56:47,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:56:47,183 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:56:47,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:56:47,897 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 04:56:47,898 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:56:47,898 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1392424068] [2023-04-01 04:56:47,898 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1392424068] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 04:56:47,898 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 04:56:47,899 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2023-04-01 04:56:47,899 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [95528857] [2023-04-01 04:56:47,899 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 04:56:47,900 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-04-01 04:56:47,900 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 04:56:47,901 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-04-01 04:56:47,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2023-04-01 04:56:47,902 INFO L87 Difference]: Start difference. First operand 41 states and 47 transitions. Second operand has 11 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 04:56:48,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 04:56:48,363 INFO L93 Difference]: Finished difference Result 89 states and 108 transitions. [2023-04-01 04:56:48,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-04-01 04:56:48,364 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2023-04-01 04:56:48,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 04:56:48,365 INFO L225 Difference]: With dead ends: 89 [2023-04-01 04:56:48,365 INFO L226 Difference]: Without dead ends: 63 [2023-04-01 04:56:48,366 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2023-04-01 04:56:48,366 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 51 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-01 04:56:48,367 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 121 Invalid, 305 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 289 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-01 04:56:48,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2023-04-01 04:56:48,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 56. [2023-04-01 04:56:48,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 39 states have (on average 1.2820512820512822) internal successors, (50), 41 states have internal predecessors, (50), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-04-01 04:56:48,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 67 transitions. [2023-04-01 04:56:48,374 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 67 transitions. Word has length 17 [2023-04-01 04:56:48,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 04:56:48,374 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 67 transitions. [2023-04-01 04:56:48,374 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 04:56:48,374 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 67 transitions. [2023-04-01 04:56:48,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-04-01 04:56:48,375 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:56:48,375 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 04:56:48,375 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-01 04:56:48,375 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting check_queueErr0ASSERT_VIOLATIONERROR_FUNCTION === [check_queueErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:56:48,376 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:56:48,376 INFO L85 PathProgramCache]: Analyzing trace with hash 1603722255, now seen corresponding path program 1 times [2023-04-01 04:56:48,376 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:56:48,376 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1748213942] [2023-04-01 04:56:48,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:56:48,376 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:56:48,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:56:48,939 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 04:56:48,939 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:56:48,939 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1748213942] [2023-04-01 04:56:48,939 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1748213942] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 04:56:48,940 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1390613861] [2023-04-01 04:56:48,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:56:48,940 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 04:56:48,941 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 04:56:48,949 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 04:56:48,990 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 04:56:49,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:56:49,134 INFO L262 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 75 conjunts are in the unsatisfiable core [2023-04-01 04:56:49,152 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 04:56:49,209 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 04:56:49,299 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-04-01 04:56:49,299 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-04-01 04:56:49,311 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2023-04-01 04:56:49,320 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2023-04-01 04:56:49,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:56:49,477 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 28 [2023-04-01 04:56:49,484 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 18 [2023-04-01 04:56:49,491 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 25 [2023-04-01 04:56:49,498 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 11 [2023-04-01 04:56:49,504 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2023-04-01 04:56:49,779 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 04:56:49,780 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 04:56:50,008 WARN L839 $PredicateComparison]: unable to prove that (let ((.cse0 (+ c_main_~new_process~0.offset 8))) (and (forall ((v_ArrVal_124 (Array Int Int))) (= (select (select (store (store |c_#memory_$Pointer$.base| c_main_~new_process~0.base (store (select |c_#memory_$Pointer$.base| c_main_~new_process~0.base) .cse0 (select (select |c_#memory_$Pointer$.base| |c_main_~#queue~0.base|) |c_main_~#queue~0.offset|))) |c_main_~#queue~0.base| (store (select (store |c_#memory_$Pointer$.base| c_main_~new_process~0.base v_ArrVal_124) |c_main_~#queue~0.base|) |c_main_~#queue~0.offset| c_main_~new_process~0.base)) c_main_~new_process~0.base) .cse0) 0)) (= (select (select (let ((.cse1 (store |c_#memory_$Pointer$.offset| c_main_~new_process~0.base (store (select |c_#memory_$Pointer$.offset| c_main_~new_process~0.base) .cse0 (select (select |c_#memory_$Pointer$.offset| |c_main_~#queue~0.base|) |c_main_~#queue~0.offset|))))) (store .cse1 |c_main_~#queue~0.base| (store (select .cse1 |c_main_~#queue~0.base|) |c_main_~#queue~0.offset| c_main_~new_process~0.offset))) c_main_~new_process~0.base) .cse0) 0))) is different from false [2023-04-01 04:56:50,011 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1390613861] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 04:56:50,011 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [900004843] [2023-04-01 04:56:50,032 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-01 04:56:50,036 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 04:56:50,040 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 04:56:50,044 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 04:56:50,044 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 04:56:50,109 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-04-01 04:56:50,370 INFO L197 IcfgInterpreter]: Interpreting procedure check_queue with input of size 29 for LOIs [2023-04-01 04:56:50,419 INFO L197 IcfgInterpreter]: Interpreting procedure append_to_queue with input of size 115 for LOIs [2023-04-01 04:56:50,441 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 04:56:50,444 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 04:56:53,555 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '554#(and (<= 1 |#StackHeapBarrier|) (= |check_queue_#in~q.base| check_queue_~q.base) (= |#NULL.offset| 0) (= check_queue_~q.offset |check_queue_#in~q.offset|) (= |#NULL.base| 0))' at error location [2023-04-01 04:56:53,555 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 04:56:53,555 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 04:56:53,555 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2023-04-01 04:56:53,555 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947439965] [2023-04-01 04:56:53,555 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 04:56:53,556 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-04-01 04:56:53,556 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 04:56:53,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-04-01 04:56:53,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=1078, Unknown=1, NotChecked=66, Total=1260 [2023-04-01 04:56:53,557 INFO L87 Difference]: Start difference. First operand 56 states and 67 transitions. Second operand has 18 states, 12 states have (on average 2.0) internal successors, (24), 13 states have internal predecessors, (24), 5 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 04:56:54,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 04:56:54,247 INFO L93 Difference]: Finished difference Result 118 states and 147 transitions. [2023-04-01 04:56:54,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-04-01 04:56:54,247 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 12 states have (on average 2.0) internal successors, (24), 13 states have internal predecessors, (24), 5 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 20 [2023-04-01 04:56:54,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 04:56:54,248 INFO L225 Difference]: With dead ends: 118 [2023-04-01 04:56:54,248 INFO L226 Difference]: Without dead ends: 78 [2023-04-01 04:56:54,249 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 415 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=179, Invalid=1630, Unknown=1, NotChecked=82, Total=1892 [2023-04-01 04:56:54,250 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 60 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 389 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 416 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 389 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-04-01 04:56:54,250 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 159 Invalid, 416 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 389 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-04-01 04:56:54,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2023-04-01 04:56:54,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 74. [2023-04-01 04:56:54,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 52 states have (on average 1.2692307692307692) internal successors, (66), 55 states have internal predecessors, (66), 12 states have call successors, (12), 9 states have call predecessors, (12), 9 states have return successors, (13), 11 states have call predecessors, (13), 11 states have call successors, (13) [2023-04-01 04:56:54,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 91 transitions. [2023-04-01 04:56:54,272 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 91 transitions. Word has length 20 [2023-04-01 04:56:54,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 04:56:54,272 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 91 transitions. [2023-04-01 04:56:54,272 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 12 states have (on average 2.0) internal successors, (24), 13 states have internal predecessors, (24), 5 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 04:56:54,272 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 91 transitions. [2023-04-01 04:56:54,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-04-01 04:56:54,273 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:56:54,275 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 04:56:54,297 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-04-01 04:56:54,482 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 04:56:54,483 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting check_queueErr0ASSERT_VIOLATIONERROR_FUNCTION === [check_queueErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:56:54,483 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:56:54,483 INFO L85 PathProgramCache]: Analyzing trace with hash -1443538065, now seen corresponding path program 1 times [2023-04-01 04:56:54,483 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:56:54,483 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1472779775] [2023-04-01 04:56:54,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:56:54,483 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:56:54,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:56:54,662 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 04:56:54,663 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:56:54,663 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1472779775] [2023-04-01 04:56:54,663 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1472779775] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 04:56:54,663 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1906775149] [2023-04-01 04:56:54,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:56:54,664 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 04:56:54,664 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 04:56:54,677 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 04:56:54,679 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 04:56:54,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:56:54,824 INFO L262 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 29 conjunts are in the unsatisfiable core [2023-04-01 04:56:54,828 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 04:56:54,872 INFO L321 Elim1Store]: treesize reduction 26, result has 42.2 percent of original size [2023-04-01 04:56:54,873 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 36 treesize of output 74 [2023-04-01 04:56:54,904 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-01 04:56:54,910 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-01 04:56:54,935 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 11 [2023-04-01 04:56:54,937 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 04:56:54,963 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 04:56:54,968 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 04:56:54,968 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-01 04:56:54,968 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1906775149] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 04:56:54,968 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-01 04:56:54,968 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [8] total 11 [2023-04-01 04:56:54,969 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1687579043] [2023-04-01 04:56:54,969 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 04:56:54,969 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-04-01 04:56:54,969 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 04:56:54,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-04-01 04:56:54,970 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2023-04-01 04:56:54,970 INFO L87 Difference]: Start difference. First operand 74 states and 91 transitions. Second operand has 9 states, 5 states have (on average 3.8) internal successors, (19), 8 states have internal predecessors, (19), 4 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 04:56:55,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 04:56:55,223 INFO L93 Difference]: Finished difference Result 149 states and 190 transitions. [2023-04-01 04:56:55,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-01 04:56:55,224 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 5 states have (on average 3.8) internal successors, (19), 8 states have internal predecessors, (19), 4 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) Word has length 29 [2023-04-01 04:56:55,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 04:56:55,225 INFO L225 Difference]: With dead ends: 149 [2023-04-01 04:56:55,225 INFO L226 Difference]: Without dead ends: 90 [2023-04-01 04:56:55,226 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2023-04-01 04:56:55,226 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 35 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 155 SdHoareTripleChecker+Invalid, 147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 04:56:55,227 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 155 Invalid, 147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 139 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 04:56:55,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2023-04-01 04:56:55,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 83. [2023-04-01 04:56:55,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 59 states have (on average 1.271186440677966) internal successors, (75), 63 states have internal predecessors, (75), 13 states have call successors, (13), 9 states have call predecessors, (13), 10 states have return successors, (15), 12 states have call predecessors, (15), 12 states have call successors, (15) [2023-04-01 04:56:55,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 103 transitions. [2023-04-01 04:56:55,249 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 103 transitions. Word has length 29 [2023-04-01 04:56:55,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 04:56:55,250 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 103 transitions. [2023-04-01 04:56:55,250 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 5 states have (on average 3.8) internal successors, (19), 8 states have internal predecessors, (19), 4 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 04:56:55,250 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 103 transitions. [2023-04-01 04:56:55,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-04-01 04:56:55,251 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:56:55,251 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 04:56:55,267 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 04:56:55,457 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 04:56:55,457 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting check_queueErr0ASSERT_VIOLATIONERROR_FUNCTION === [check_queueErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:56:55,457 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:56:55,457 INFO L85 PathProgramCache]: Analyzing trace with hash 332911900, now seen corresponding path program 1 times [2023-04-01 04:56:55,458 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:56:55,458 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [859616260] [2023-04-01 04:56:55,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:56:55,458 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:56:55,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:56:56,083 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 04:56:56,084 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:56:56,084 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [859616260] [2023-04-01 04:56:56,084 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [859616260] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 04:56:56,084 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [330477134] [2023-04-01 04:56:56,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:56:56,084 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 04:56:56,085 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 04:56:56,101 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 04:56:56,104 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 04:56:56,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:56:56,236 INFO L262 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 64 conjunts are in the unsatisfiable core [2023-04-01 04:56:56,239 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 04:56:56,324 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 15 [2023-04-01 04:56:56,374 INFO L321 Elim1Store]: treesize reduction 26, result has 42.2 percent of original size [2023-04-01 04:56:56,374 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 36 treesize of output 74 [2023-04-01 04:56:56,380 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-01 04:56:56,385 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-01 04:56:56,413 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 04:56:56,414 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 5 [2023-04-01 04:56:56,416 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 04:56:56,446 INFO L321 Elim1Store]: treesize reduction 26, result has 42.2 percent of original size [2023-04-01 04:56:56,447 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 36 treesize of output 74 [2023-04-01 04:56:56,453 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-01 04:56:56,459 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-01 04:56:56,470 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 04:56:56,471 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 5 [2023-04-01 04:56:56,474 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-04-01 04:56:56,499 WARN L861 $PredicateComparison]: unable to prove that (let ((.cse1 (= |c_append_to_queue_#in~n.base| |c_append_to_queue_#in~q.base|))) (and (let ((.cse0 (= (select (select |c_#memory_$Pointer$.offset| |c_append_to_queue_#in~q.base|) |c_append_to_queue_#in~q.offset|) |c_append_to_queue_#in~n.offset|))) (or (and .cse0 .cse1) (and (exists ((v_DerPreprocessor_1 (Array Int Int)) (v_DerPreprocessor_2 (Array Int Int))) (and (= |c_append_to_queue_#in~n.offset| (select v_DerPreprocessor_2 |c_append_to_queue_#in~q.offset|)) (= (select |c_#memory_$Pointer$.offset| |c_append_to_queue_#in~n.base|) (select (store (store (store (store |c_#memory_$Pointer$.offset| |c_append_to_queue_#in~n.base| v_DerPreprocessor_1) |c_append_to_queue_#in~q.base| v_DerPreprocessor_2) |c_append_to_queue_#in~n.base| v_DerPreprocessor_1) |c_append_to_queue_#in~q.base| v_DerPreprocessor_2) |c_append_to_queue_#in~n.base|)))) .cse0))) (let ((.cse2 (= |c_append_to_queue_#in~n.base| (select (select |c_#memory_$Pointer$.base| |c_append_to_queue_#in~q.base|) |c_append_to_queue_#in~q.offset|)))) (or (and .cse2 .cse1) (and (exists ((v_DerPreprocessor_3 (Array Int Int)) (v_DerPreprocessor_4 (Array Int Int))) (let ((.cse3 (select (store (store (store (store |c_#memory_$Pointer$.base| |c_append_to_queue_#in~n.base| v_DerPreprocessor_3) |c_append_to_queue_#in~q.base| v_DerPreprocessor_4) |c_append_to_queue_#in~n.base| v_DerPreprocessor_3) |c_append_to_queue_#in~q.base| v_DerPreprocessor_4) |c_append_to_queue_#in~n.base|))) (and (= |c_append_to_queue_#in~n.base| (select v_DerPreprocessor_4 |c_append_to_queue_#in~q.offset|)) (= v_DerPreprocessor_3 .cse3) (= (select |c_#memory_$Pointer$.base| |c_append_to_queue_#in~n.base|) .cse3)))) .cse2))) (exists ((v_ArrVal_374 Int) (v_ArrVal_382 (Array Int Int))) (= (store (store |c_old(#memory_int)| |c_append_to_queue_#in~n.base| (store (select |c_old(#memory_int)| |c_append_to_queue_#in~n.base|) (+ |c_append_to_queue_#in~n.offset| 8) v_ArrVal_374)) |c_append_to_queue_#in~q.base| v_ArrVal_382) |c_#memory_int|)))) is different from true [2023-04-01 04:56:56,530 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 32 [2023-04-01 04:56:56,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:56:56,535 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2023-04-01 04:56:56,583 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-04-01 04:56:56,584 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 108 treesize of output 81 [2023-04-01 04:56:56,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:56:56,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:56:56,592 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 9 [2023-04-01 04:56:56,623 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2023-04-01 04:56:56,625 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 15 treesize of output 11 [2023-04-01 04:56:56,651 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 15 treesize of output 7 [2023-04-01 04:56:56,654 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 04:56:56,654 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 04:56:56,855 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [330477134] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 04:56:56,855 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2118044331] [2023-04-01 04:56:56,857 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-04-01 04:56:56,857 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 04:56:56,857 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 04:56:56,857 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 04:56:56,857 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 04:56:56,872 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-04-01 04:56:57,595 INFO L197 IcfgInterpreter]: Interpreting procedure check_queue with input of size 29 for LOIs [2023-04-01 04:56:57,637 INFO L197 IcfgInterpreter]: Interpreting procedure append_to_queue with input of size 131 for LOIs [2023-04-01 04:56:57,656 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 04:56:57,658 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 04:56:59,857 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1428#(and (<= 1 |#StackHeapBarrier|) (= |check_queue_#in~q.base| check_queue_~q.base) (= |#NULL.offset| 0) (= check_queue_~q.offset |check_queue_#in~q.offset|) (= |#NULL.base| 0))' at error location [2023-04-01 04:56:59,857 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 04:56:59,857 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 04:56:59,857 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 19 [2023-04-01 04:56:59,857 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311493391] [2023-04-01 04:56:59,858 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 04:56:59,858 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-04-01 04:56:59,858 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 04:56:59,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-04-01 04:56:59,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=1350, Unknown=6, NotChecked=74, Total=1560 [2023-04-01 04:56:59,859 INFO L87 Difference]: Start difference. First operand 83 states and 103 transitions. Second operand has 19 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 15 states have internal predecessors, (35), 7 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2023-04-01 04:56:59,983 WARN L861 $PredicateComparison]: unable to prove that (let ((.cse2 (select (select |c_#memory_$Pointer$.offset| |c_append_to_queue_#in~q.base|) |c_append_to_queue_#in~q.offset|)) (.cse1 (= |c_append_to_queue_#in~n.base| |c_append_to_queue_#in~q.base|)) (.cse6 (select (select |c_#memory_$Pointer$.base| |c_append_to_queue_#in~q.base|) |c_append_to_queue_#in~q.offset|)) (.cse5 (select |c_old(#memory_int)| |c_append_to_queue_#in~n.base|))) (and (let ((.cse0 (= .cse2 |c_append_to_queue_#in~n.offset|))) (or (and .cse0 .cse1) (and (exists ((v_DerPreprocessor_1 (Array Int Int)) (v_DerPreprocessor_2 (Array Int Int))) (and (= |c_append_to_queue_#in~n.offset| (select v_DerPreprocessor_2 |c_append_to_queue_#in~q.offset|)) (= (select |c_#memory_$Pointer$.offset| |c_append_to_queue_#in~n.base|) (select (store (store (store (store |c_#memory_$Pointer$.offset| |c_append_to_queue_#in~n.base| v_DerPreprocessor_1) |c_append_to_queue_#in~q.base| v_DerPreprocessor_2) |c_append_to_queue_#in~n.base| v_DerPreprocessor_1) |c_append_to_queue_#in~q.base| v_DerPreprocessor_2) |c_append_to_queue_#in~n.base|)))) .cse0))) (or .cse1 (let ((.cse4 (select |c_#memory_int| .cse6))) (let ((.cse3 (@diff .cse5 .cse4))) (and (or (= .cse3 8) (= .cse4 .cse5)) (= .cse2 0) (= (store .cse5 .cse3 (select .cse4 .cse3)) .cse4)))) (not (= |c_append_to_queue_#in~n.offset| 0))) (let ((.cse7 (= |c_append_to_queue_#in~n.base| .cse6))) (or (and .cse7 .cse1) (and (exists ((v_DerPreprocessor_3 (Array Int Int)) (v_DerPreprocessor_4 (Array Int Int))) (let ((.cse8 (select (store (store (store (store |c_#memory_$Pointer$.base| |c_append_to_queue_#in~n.base| v_DerPreprocessor_3) |c_append_to_queue_#in~q.base| v_DerPreprocessor_4) |c_append_to_queue_#in~n.base| v_DerPreprocessor_3) |c_append_to_queue_#in~q.base| v_DerPreprocessor_4) |c_append_to_queue_#in~n.base|))) (and (= |c_append_to_queue_#in~n.base| (select v_DerPreprocessor_4 |c_append_to_queue_#in~q.offset|)) (= v_DerPreprocessor_3 .cse8) (= (select |c_#memory_$Pointer$.base| |c_append_to_queue_#in~n.base|) .cse8)))) .cse7))) (exists ((v_ArrVal_374 Int) (v_ArrVal_382 (Array Int Int))) (= (store (store |c_old(#memory_int)| |c_append_to_queue_#in~n.base| (store .cse5 (+ |c_append_to_queue_#in~n.offset| 8) v_ArrVal_374)) |c_append_to_queue_#in~q.base| v_ArrVal_382) |c_#memory_int|)))) is different from true [2023-04-01 04:57:00,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 04:57:00,711 INFO L93 Difference]: Finished difference Result 185 states and 238 transitions. [2023-04-01 04:57:00,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-04-01 04:57:00,711 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 15 states have internal predecessors, (35), 7 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) Word has length 32 [2023-04-01 04:57:00,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 04:57:00,713 INFO L225 Difference]: With dead ends: 185 [2023-04-01 04:57:00,713 INFO L226 Difference]: Without dead ends: 117 [2023-04-01 04:57:00,714 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 44 SyntacticMatches, 3 SemanticMatches, 51 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 576 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=240, Invalid=2311, Unknown=7, NotChecked=198, Total=2756 [2023-04-01 04:57:00,715 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 57 mSDsluCounter, 181 mSDsCounter, 0 mSdLazyCounter, 658 mSolverCounterSat, 22 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 208 SdHoareTripleChecker+Invalid, 810 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 658 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 129 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-04-01 04:57:00,715 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 208 Invalid, 810 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 658 Invalid, 1 Unknown, 129 Unchecked, 0.5s Time] [2023-04-01 04:57:00,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2023-04-01 04:57:00,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 107. [2023-04-01 04:57:00,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 78 states have (on average 1.2307692307692308) internal successors, (96), 81 states have internal predecessors, (96), 17 states have call successors, (17), 10 states have call predecessors, (17), 11 states have return successors, (20), 15 states have call predecessors, (20), 16 states have call successors, (20) [2023-04-01 04:57:00,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 133 transitions. [2023-04-01 04:57:00,728 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 133 transitions. Word has length 32 [2023-04-01 04:57:00,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 04:57:00,735 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 133 transitions. [2023-04-01 04:57:00,736 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 15 states have internal predecessors, (35), 7 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2023-04-01 04:57:00,736 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 133 transitions. [2023-04-01 04:57:00,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-04-01 04:57:00,739 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:57:00,739 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 04:57:00,746 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 04:57:00,946 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 04:57:00,947 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting check_queueErr0ASSERT_VIOLATIONERROR_FUNCTION === [check_queueErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:57:00,947 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:57:00,947 INFO L85 PathProgramCache]: Analyzing trace with hash 702786453, now seen corresponding path program 2 times [2023-04-01 04:57:00,947 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:57:00,947 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2119758760] [2023-04-01 04:57:00,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:57:00,948 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:57:00,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:57:02,247 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 04:57:02,247 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:57:02,247 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2119758760] [2023-04-01 04:57:02,247 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2119758760] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 04:57:02,247 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1174352455] [2023-04-01 04:57:02,247 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 04:57:02,248 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 04:57:02,248 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 04:57:02,251 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 04:57:02,293 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 04:57:02,438 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-01 04:57:02,438 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 04:57:02,442 INFO L262 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 121 conjunts are in the unsatisfiable core [2023-04-01 04:57:02,447 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 04:57:02,453 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 04:57:02,498 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:02,499 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 0 case distinctions, treesize of input 17 treesize of output 17 [2023-04-01 04:57:02,506 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 15 [2023-04-01 04:57:02,550 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 04:57:02,617 INFO L321 Elim1Store]: treesize reduction 26, result has 42.2 percent of original size [2023-04-01 04:57:02,617 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 36 treesize of output 74 [2023-04-01 04:57:02,622 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-01 04:57:02,626 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-01 04:57:02,660 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 11 [2023-04-01 04:57:02,663 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 04:57:02,688 INFO L321 Elim1Store]: treesize reduction 26, result has 42.2 percent of original size [2023-04-01 04:57:02,689 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 36 treesize of output 74 [2023-04-01 04:57:02,696 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-01 04:57:02,702 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-01 04:57:02,715 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 11 [2023-04-01 04:57:02,718 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 04:57:02,836 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 32 [2023-04-01 04:57:02,842 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:02,843 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2023-04-01 04:57:03,186 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:03,186 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2023-04-01 04:57:03,192 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:03,192 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 34 [2023-04-01 04:57:03,201 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:03,202 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:03,207 INFO L321 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2023-04-01 04:57:03,208 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 18 [2023-04-01 04:57:03,218 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:03,219 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2023-04-01 04:57:03,284 WARN L861 $PredicateComparison]: unable to prove that (let ((.cse0 (+ |c_append_to_queue_#in~n.offset| 8))) (and (exists ((v_ArrVal_556 (Array Int Int))) (= |c_#memory_$Pointer$.offset| (store (store |c_old(#memory_$Pointer$.offset)| |c_append_to_queue_#in~n.base| (store (select |c_old(#memory_$Pointer$.offset)| |c_append_to_queue_#in~n.base|) .cse0 (select (select |c_old(#memory_$Pointer$.offset)| |c_append_to_queue_#in~q.base|) |c_append_to_queue_#in~q.offset|))) |c_append_to_queue_#in~q.base| (store (select (store |c_old(#memory_$Pointer$.offset)| |c_append_to_queue_#in~n.base| v_ArrVal_556) |c_append_to_queue_#in~q.base|) |c_append_to_queue_#in~q.offset| |c_append_to_queue_#in~n.offset|)))) (exists ((v_ArrVal_552 (Array Int Int))) (= |c_#memory_$Pointer$.base| (store (store |c_old(#memory_$Pointer$.base)| |c_append_to_queue_#in~n.base| (store (select |c_old(#memory_$Pointer$.base)| |c_append_to_queue_#in~n.base|) .cse0 (select (select |c_old(#memory_$Pointer$.base)| |c_append_to_queue_#in~q.base|) |c_append_to_queue_#in~q.offset|))) |c_append_to_queue_#in~q.base| (store (select (store |c_old(#memory_$Pointer$.base)| |c_append_to_queue_#in~n.base| v_ArrVal_552) |c_append_to_queue_#in~q.base|) |c_append_to_queue_#in~q.offset| |c_append_to_queue_#in~n.base|)))) (exists ((v_ArrVal_558 (Array Int Int)) (v_ArrVal_550 (Array Int Int))) (= (store (store |c_old(#memory_int)| |c_append_to_queue_#in~n.base| v_ArrVal_558) |c_append_to_queue_#in~q.base| v_ArrVal_550) |c_#memory_int|)))) is different from true [2023-04-01 04:57:03,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:03,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:03,303 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 25 [2023-04-01 04:57:03,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:03,311 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:03,311 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 28 [2023-04-01 04:57:03,315 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:03,317 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:03,318 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 52 treesize of output 47 [2023-04-01 04:57:03,323 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:03,324 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 52 treesize of output 44 [2023-04-01 04:57:03,330 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 10 treesize of output 9 [2023-04-01 04:57:03,334 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 31 [2023-04-01 04:57:03,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:03,344 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 29 [2023-04-01 04:57:03,350 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2023-04-01 04:57:03,357 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 11 [2023-04-01 04:57:03,673 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 04:57:03,673 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 76 treesize of output 35 [2023-04-01 04:57:03,677 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:03,678 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2023-04-01 04:57:03,713 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 15 treesize of output 7 [2023-04-01 04:57:03,742 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 1 trivial. 1 not checked. [2023-04-01 04:57:03,742 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 04:57:04,134 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1174352455] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 04:57:04,134 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1820606564] [2023-04-01 04:57:04,135 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-04-01 04:57:04,135 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 04:57:04,136 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 04:57:04,136 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 04:57:04,136 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 04:57:04,167 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-04-01 04:57:04,725 INFO L197 IcfgInterpreter]: Interpreting procedure check_queue with input of size 29 for LOIs [2023-04-01 04:57:04,757 INFO L197 IcfgInterpreter]: Interpreting procedure append_to_queue with input of size 131 for LOIs [2023-04-01 04:57:04,773 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 04:57:04,775 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 04:57:07,555 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2052#(and (<= 1 |#StackHeapBarrier|) (= |check_queue_#in~q.base| check_queue_~q.base) (= |#NULL.offset| 0) (= check_queue_~q.offset |check_queue_#in~q.offset|) (= |#NULL.base| 0))' at error location [2023-04-01 04:57:07,556 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 04:57:07,556 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 04:57:07,556 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 32 [2023-04-01 04:57:07,556 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847628930] [2023-04-01 04:57:07,556 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 04:57:07,556 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-04-01 04:57:07,557 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 04:57:07,557 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-04-01 04:57:07,558 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=2508, Unknown=1, NotChecked=100, Total=2756 [2023-04-01 04:57:07,558 INFO L87 Difference]: Start difference. First operand 107 states and 133 transitions. Second operand has 32 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 25 states have internal predecessors, (48), 9 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) [2023-04-01 04:57:13,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 04:57:13,313 INFO L93 Difference]: Finished difference Result 322 states and 417 transitions. [2023-04-01 04:57:13,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2023-04-01 04:57:13,313 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 25 states have internal predecessors, (48), 9 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) Word has length 35 [2023-04-01 04:57:13,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 04:57:13,316 INFO L225 Difference]: With dead ends: 322 [2023-04-01 04:57:13,317 INFO L226 Difference]: Without dead ends: 320 [2023-04-01 04:57:13,319 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 58 SyntacticMatches, 5 SemanticMatches, 94 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1902 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=637, Invalid=8296, Unknown=1, NotChecked=186, Total=9120 [2023-04-01 04:57:13,321 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 379 mSDsluCounter, 372 mSDsCounter, 0 mSdLazyCounter, 1856 mSolverCounterSat, 162 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 380 SdHoareTripleChecker+Valid, 398 SdHoareTripleChecker+Invalid, 2285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 162 IncrementalHoareTripleChecker+Valid, 1856 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 267 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2023-04-01 04:57:13,321 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [380 Valid, 398 Invalid, 2285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [162 Valid, 1856 Invalid, 0 Unknown, 267 Unchecked, 2.2s Time] [2023-04-01 04:57:13,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2023-04-01 04:57:13,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 197. [2023-04-01 04:57:13,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 149 states have (on average 1.2684563758389262) internal successors, (189), 153 states have internal predecessors, (189), 29 states have call successors, (29), 16 states have call predecessors, (29), 18 states have return successors, (36), 27 states have call predecessors, (36), 28 states have call successors, (36) [2023-04-01 04:57:13,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 254 transitions. [2023-04-01 04:57:13,379 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 254 transitions. Word has length 35 [2023-04-01 04:57:13,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 04:57:13,380 INFO L495 AbstractCegarLoop]: Abstraction has 197 states and 254 transitions. [2023-04-01 04:57:13,380 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 25 states have internal predecessors, (48), 9 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) [2023-04-01 04:57:13,380 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 254 transitions. [2023-04-01 04:57:13,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-04-01 04:57:13,381 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:57:13,381 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 04:57:13,388 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-01 04:57:13,587 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 04:57:13,588 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting check_queueErr0ASSERT_VIOLATIONERROR_FUNCTION === [check_queueErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:57:13,588 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:57:13,588 INFO L85 PathProgramCache]: Analyzing trace with hash -1250486660, now seen corresponding path program 3 times [2023-04-01 04:57:13,588 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:57:13,588 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2122594124] [2023-04-01 04:57:13,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:57:13,589 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:57:13,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:57:15,376 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 7 proven. 20 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 04:57:15,377 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:57:15,377 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2122594124] [2023-04-01 04:57:15,377 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2122594124] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 04:57:15,377 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [169612895] [2023-04-01 04:57:15,377 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 04:57:15,377 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 04:57:15,377 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 04:57:15,381 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 04:57:15,383 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-01 04:57:15,559 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 04:57:15,559 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 04:57:15,562 INFO L262 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 136 conjunts are in the unsatisfiable core [2023-04-01 04:57:15,567 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 04:57:15,612 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:15,613 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2023-04-01 04:57:15,617 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 04:57:15,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:15,626 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2023-04-01 04:57:15,665 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 04:57:15,668 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 04:57:15,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:15,782 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:15,783 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 28 [2023-04-01 04:57:15,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:15,788 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 18 [2023-04-01 04:57:15,795 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:15,795 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 29 [2023-04-01 04:57:15,798 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2023-04-01 04:57:15,803 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 11 [2023-04-01 04:57:16,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:16,120 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:16,120 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:16,121 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 30 [2023-04-01 04:57:16,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:16,136 INFO L321 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2023-04-01 04:57:16,137 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 47 treesize of output 49 [2023-04-01 04:57:16,148 INFO L321 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2023-04-01 04:57:16,148 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 15 [2023-04-01 04:57:16,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:16,262 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:16,263 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 32 [2023-04-01 04:57:16,267 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:16,274 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2023-04-01 04:57:16,274 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 75 treesize of output 44 [2023-04-01 04:57:16,679 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 3 proven. 24 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 04:57:16,680 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 04:57:17,805 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [169612895] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 04:57:17,805 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [511365193] [2023-04-01 04:57:17,806 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-04-01 04:57:17,806 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 04:57:17,807 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 04:57:17,807 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 04:57:17,807 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 04:57:17,817 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-04-01 04:57:18,333 INFO L197 IcfgInterpreter]: Interpreting procedure check_queue with input of size 29 for LOIs [2023-04-01 04:57:18,380 INFO L197 IcfgInterpreter]: Interpreting procedure append_to_queue with input of size 131 for LOIs [2023-04-01 04:57:18,395 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 04:57:18,399 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 04:57:21,391 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3087#(and (<= 1 |#StackHeapBarrier|) (= |check_queue_#in~q.base| check_queue_~q.base) (= |#NULL.offset| 0) (= check_queue_~q.offset |check_queue_#in~q.offset|) (= |#NULL.base| 0))' at error location [2023-04-01 04:57:21,392 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 04:57:21,392 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 04:57:21,392 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 18] total 31 [2023-04-01 04:57:21,392 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913239506] [2023-04-01 04:57:21,392 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 04:57:21,393 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2023-04-01 04:57:21,393 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 04:57:21,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2023-04-01 04:57:21,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=2794, Unknown=0, NotChecked=0, Total=2970 [2023-04-01 04:57:21,394 INFO L87 Difference]: Start difference. First operand 197 states and 254 transitions. Second operand has 31 states, 19 states have (on average 2.736842105263158) internal successors, (52), 25 states have internal predecessors, (52), 9 states have call successors, (10), 6 states have call predecessors, (10), 6 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) [2023-04-01 04:57:25,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 04:57:25,813 INFO L93 Difference]: Finished difference Result 572 states and 763 transitions. [2023-04-01 04:57:25,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2023-04-01 04:57:25,814 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 19 states have (on average 2.736842105263158) internal successors, (52), 25 states have internal predecessors, (52), 9 states have call successors, (10), 6 states have call predecessors, (10), 6 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) Word has length 38 [2023-04-01 04:57:25,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 04:57:25,821 INFO L225 Difference]: With dead ends: 572 [2023-04-01 04:57:25,821 INFO L226 Difference]: Without dead ends: 427 [2023-04-01 04:57:25,826 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 61 SyntacticMatches, 6 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2167 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=646, Invalid=7726, Unknown=0, NotChecked=0, Total=8372 [2023-04-01 04:57:25,827 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 171 mSDsluCounter, 648 mSDsCounter, 0 mSdLazyCounter, 1991 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 174 SdHoareTripleChecker+Valid, 700 SdHoareTripleChecker+Invalid, 2051 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 1991 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2023-04-01 04:57:25,827 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [174 Valid, 700 Invalid, 2051 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 1991 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2023-04-01 04:57:25,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 427 states. [2023-04-01 04:57:25,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 427 to 399. [2023-04-01 04:57:25,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 399 states, 305 states have (on average 1.2557377049180327) internal successors, (383), 313 states have internal predecessors, (383), 59 states have call successors, (59), 29 states have call predecessors, (59), 34 states have return successors, (77), 56 states have call predecessors, (77), 58 states have call successors, (77) [2023-04-01 04:57:25,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399 states to 399 states and 519 transitions. [2023-04-01 04:57:25,914 INFO L78 Accepts]: Start accepts. Automaton has 399 states and 519 transitions. Word has length 38 [2023-04-01 04:57:25,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 04:57:25,915 INFO L495 AbstractCegarLoop]: Abstraction has 399 states and 519 transitions. [2023-04-01 04:57:25,915 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 19 states have (on average 2.736842105263158) internal successors, (52), 25 states have internal predecessors, (52), 9 states have call successors, (10), 6 states have call predecessors, (10), 6 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) [2023-04-01 04:57:25,915 INFO L276 IsEmpty]: Start isEmpty. Operand 399 states and 519 transitions. [2023-04-01 04:57:25,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-04-01 04:57:25,919 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:57:25,919 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 04:57:25,925 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-04-01 04:57:26,123 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 04:57:26,124 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting check_queueErr0ASSERT_VIOLATIONERROR_FUNCTION === [check_queueErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:57:26,124 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:57:26,124 INFO L85 PathProgramCache]: Analyzing trace with hash 587851334, now seen corresponding path program 1 times [2023-04-01 04:57:26,124 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:57:26,124 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1754449452] [2023-04-01 04:57:26,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:57:26,124 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:57:26,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:57:26,279 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 04:57:26,280 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:57:26,280 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1754449452] [2023-04-01 04:57:26,280 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1754449452] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 04:57:26,280 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 04:57:26,280 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-04-01 04:57:26,280 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376614338] [2023-04-01 04:57:26,280 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 04:57:26,281 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-04-01 04:57:26,281 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 04:57:26,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-04-01 04:57:26,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2023-04-01 04:57:26,281 INFO L87 Difference]: Start difference. First operand 399 states and 519 transitions. Second operand has 8 states, 5 states have (on average 5.4) internal successors, (27), 7 states have internal predecessors, (27), 4 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2023-04-01 04:57:26,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 04:57:26,502 INFO L93 Difference]: Finished difference Result 467 states and 607 transitions. [2023-04-01 04:57:26,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-01 04:57:26,502 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 5 states have (on average 5.4) internal successors, (27), 7 states have internal predecessors, (27), 4 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 39 [2023-04-01 04:57:26,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 04:57:26,503 INFO L225 Difference]: With dead ends: 467 [2023-04-01 04:57:26,503 INFO L226 Difference]: Without dead ends: 130 [2023-04-01 04:57:26,504 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2023-04-01 04:57:26,504 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 32 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 04:57:26,504 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 75 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 156 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 04:57:26,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2023-04-01 04:57:26,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 120. [2023-04-01 04:57:26,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 86 states have (on average 1.2093023255813953) internal successors, (104), 91 states have internal predecessors, (104), 19 states have call successors, (19), 14 states have call predecessors, (19), 14 states have return successors, (21), 14 states have call predecessors, (21), 18 states have call successors, (21) [2023-04-01 04:57:26,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 144 transitions. [2023-04-01 04:57:26,517 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 144 transitions. Word has length 39 [2023-04-01 04:57:26,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 04:57:26,517 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 144 transitions. [2023-04-01 04:57:26,518 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 5 states have (on average 5.4) internal successors, (27), 7 states have internal predecessors, (27), 4 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2023-04-01 04:57:26,518 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 144 transitions. [2023-04-01 04:57:26,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-04-01 04:57:26,518 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:57:26,518 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 04:57:26,518 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-04-01 04:57:26,518 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting check_queueErr0ASSERT_VIOLATIONERROR_FUNCTION === [check_queueErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:57:26,519 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:57:26,519 INFO L85 PathProgramCache]: Analyzing trace with hash 1355042800, now seen corresponding path program 1 times [2023-04-01 04:57:26,519 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:57:26,519 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [398749987] [2023-04-01 04:57:26,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:57:26,519 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:57:26,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:57:27,405 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 04:57:27,406 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:57:27,406 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [398749987] [2023-04-01 04:57:27,406 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [398749987] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 04:57:27,406 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1939653369] [2023-04-01 04:57:27,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:57:27,406 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 04:57:27,406 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 04:57:27,425 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 04:57:27,426 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-01 04:57:27,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:57:27,597 INFO L262 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 116 conjunts are in the unsatisfiable core [2023-04-01 04:57:27,605 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 04:57:27,609 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 04:57:27,651 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-04-01 04:57:27,651 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-04-01 04:57:27,657 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 14 treesize of output 15 [2023-04-01 04:57:27,704 INFO L321 Elim1Store]: treesize reduction 26, result has 42.2 percent of original size [2023-04-01 04:57:27,704 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 36 treesize of output 74 [2023-04-01 04:57:27,708 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-01 04:57:27,713 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-01 04:57:27,739 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 11 [2023-04-01 04:57:27,742 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 04:57:27,770 INFO L321 Elim1Store]: treesize reduction 26, result has 42.2 percent of original size [2023-04-01 04:57:27,770 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 36 treesize of output 74 [2023-04-01 04:57:27,778 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-01 04:57:27,783 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-01 04:57:27,812 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 11 [2023-04-01 04:57:27,815 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-04-01 04:57:27,898 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 32 [2023-04-01 04:57:27,902 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2023-04-01 04:57:28,459 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 25 [2023-04-01 04:57:28,466 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 04:57:28,467 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 53 treesize of output 39 [2023-04-01 04:57:28,471 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 [2023-04-01 04:57:28,667 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 04:57:28,667 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 04:57:29,556 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1939653369] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 04:57:29,556 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [54680618] [2023-04-01 04:57:29,558 INFO L159 IcfgInterpreter]: Started Sifa with 31 locations of interest [2023-04-01 04:57:29,558 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 04:57:29,559 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 04:57:29,559 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 04:57:29,559 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 04:57:29,594 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-04-01 04:57:30,589 INFO L197 IcfgInterpreter]: Interpreting procedure check_queue with input of size 9 for LOIs [2023-04-01 04:57:30,624 INFO L197 IcfgInterpreter]: Interpreting procedure run_process with input of size 17 for LOIs [2023-04-01 04:57:30,625 INFO L197 IcfgInterpreter]: Interpreting procedure append_to_queue with input of size 35 for LOIs [2023-04-01 04:57:30,630 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 04:57:30,632 INFO L197 IcfgInterpreter]: Interpreting procedure choose_next with input of size 28 for LOIs [2023-04-01 04:57:30,703 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 04:57:32,263 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5554#(and (<= 1 |#StackHeapBarrier|) (= |check_queue_#in~q.base| check_queue_~q.base) (= |#NULL.offset| 0) (= check_queue_~q.offset |check_queue_#in~q.offset|) (= |#NULL.base| 0))' at error location [2023-04-01 04:57:32,263 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 04:57:32,263 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 04:57:32,263 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 21] total 29 [2023-04-01 04:57:32,264 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [931113833] [2023-04-01 04:57:32,264 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 04:57:32,264 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-04-01 04:57:32,264 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 04:57:32,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-04-01 04:57:32,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=2183, Unknown=20, NotChecked=0, Total=2352 [2023-04-01 04:57:32,281 INFO L87 Difference]: Start difference. First operand 120 states and 144 transitions. Second operand has 29 states, 21 states have (on average 2.4285714285714284) internal successors, (51), 24 states have internal predecessors, (51), 9 states have call successors, (11), 6 states have call predecessors, (11), 7 states have return successors, (9), 6 states have call predecessors, (9), 8 states have call successors, (9) [2023-04-01 04:57:36,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 04:57:36,853 INFO L93 Difference]: Finished difference Result 226 states and 292 transitions. [2023-04-01 04:57:36,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2023-04-01 04:57:36,853 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 21 states have (on average 2.4285714285714284) internal successors, (51), 24 states have internal predecessors, (51), 9 states have call successors, (11), 6 states have call predecessors, (11), 7 states have return successors, (9), 6 states have call predecessors, (9), 8 states have call successors, (9) Word has length 40 [2023-04-01 04:57:36,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 04:57:36,855 INFO L225 Difference]: With dead ends: 226 [2023-04-01 04:57:36,855 INFO L226 Difference]: Without dead ends: 171 [2023-04-01 04:57:36,856 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 53 SyntacticMatches, 7 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1501 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=357, Invalid=5158, Unknown=35, NotChecked=0, Total=5550 [2023-04-01 04:57:36,857 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 124 mSDsluCounter, 251 mSDsCounter, 0 mSdLazyCounter, 954 mSolverCounterSat, 54 mSolverCounterUnsat, 24 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 274 SdHoareTripleChecker+Invalid, 1032 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 954 IncrementalHoareTripleChecker+Invalid, 24 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2023-04-01 04:57:36,857 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [124 Valid, 274 Invalid, 1032 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 954 Invalid, 24 Unknown, 0 Unchecked, 3.5s Time] [2023-04-01 04:57:36,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2023-04-01 04:57:36,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 150. [2023-04-01 04:57:36,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 107 states have (on average 1.2149532710280373) internal successors, (130), 114 states have internal predecessors, (130), 24 states have call successors, (24), 17 states have call predecessors, (24), 18 states have return successors, (32), 18 states have call predecessors, (32), 23 states have call successors, (32) [2023-04-01 04:57:36,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 186 transitions. [2023-04-01 04:57:36,874 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 186 transitions. Word has length 40 [2023-04-01 04:57:36,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 04:57:36,875 INFO L495 AbstractCegarLoop]: Abstraction has 150 states and 186 transitions. [2023-04-01 04:57:36,875 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 21 states have (on average 2.4285714285714284) internal successors, (51), 24 states have internal predecessors, (51), 9 states have call successors, (11), 6 states have call predecessors, (11), 7 states have return successors, (9), 6 states have call predecessors, (9), 8 states have call successors, (9) [2023-04-01 04:57:36,875 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 186 transitions. [2023-04-01 04:57:36,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-04-01 04:57:36,876 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:57:36,876 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 04:57:36,881 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-04-01 04:57:37,082 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 04:57:37,082 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting check_queueErr0ASSERT_VIOLATIONERROR_FUNCTION === [check_queueErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:57:37,082 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:57:37,083 INFO L85 PathProgramCache]: Analyzing trace with hash -631825530, now seen corresponding path program 2 times [2023-04-01 04:57:37,083 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:57:37,083 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2145194701] [2023-04-01 04:57:37,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:57:37,083 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:57:37,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:57:38,272 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 04:57:38,273 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:57:38,273 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2145194701] [2023-04-01 04:57:38,273 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2145194701] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 04:57:38,273 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1349260481] [2023-04-01 04:57:38,273 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 04:57:38,273 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 04:57:38,273 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 04:57:38,275 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 04:57:38,276 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-01 04:57:38,447 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-01 04:57:38,447 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 04:57:38,449 INFO L262 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 94 conjunts are in the unsatisfiable core [2023-04-01 04:57:38,453 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 04:57:38,459 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 04:57:38,515 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 15 [2023-04-01 04:57:38,529 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2023-04-01 04:57:38,530 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 20 [2023-04-01 04:57:38,544 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2023-04-01 04:57:38,545 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 20 [2023-04-01 04:57:38,555 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-04-01 04:57:38,555 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-04-01 04:57:38,635 WARN L861 $PredicateComparison]: unable to prove that (let ((.cse0 (+ |c_append_to_queue_#in~n.offset| 8))) (and (exists ((v_ArrVal_1076 Int) (v_ArrVal_1072 (Array Int Int))) (= (store (store |c_old(#memory_int)| |c_append_to_queue_#in~n.base| (store (select |c_old(#memory_int)| |c_append_to_queue_#in~n.base|) .cse0 v_ArrVal_1076)) |c_append_to_queue_#in~q.base| v_ArrVal_1072) |c_#memory_int|)) (exists ((v_ArrVal_1068 (Array Int Int))) (= (store (store |c_old(#memory_$Pointer$.base)| |c_append_to_queue_#in~n.base| (store (select |c_old(#memory_$Pointer$.base)| |c_append_to_queue_#in~n.base|) .cse0 (select (select |c_old(#memory_$Pointer$.base)| |c_append_to_queue_#in~q.base|) |c_append_to_queue_#in~q.offset|))) |c_append_to_queue_#in~q.base| (store (select (store |c_old(#memory_$Pointer$.base)| |c_append_to_queue_#in~n.base| v_ArrVal_1068) |c_append_to_queue_#in~q.base|) |c_append_to_queue_#in~q.offset| |c_append_to_queue_#in~n.base|)) |c_#memory_$Pointer$.base|)) (exists ((v_ArrVal_1071 (Array Int Int))) (= |c_#memory_$Pointer$.offset| (store (store |c_old(#memory_$Pointer$.offset)| |c_append_to_queue_#in~n.base| (store (select |c_old(#memory_$Pointer$.offset)| |c_append_to_queue_#in~n.base|) .cse0 (select (select |c_old(#memory_$Pointer$.offset)| |c_append_to_queue_#in~q.base|) |c_append_to_queue_#in~q.offset|))) |c_append_to_queue_#in~q.base| (store (select (store |c_old(#memory_$Pointer$.offset)| |c_append_to_queue_#in~n.base| v_ArrVal_1071) |c_append_to_queue_#in~q.base|) |c_append_to_queue_#in~q.offset| |c_append_to_queue_#in~n.offset|)))))) is different from true [2023-04-01 04:57:38,647 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 24 [2023-04-01 04:57:38,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:38,652 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 28 [2023-04-01 04:57:38,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:38,657 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 28 [2023-04-01 04:57:38,662 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 25 [2023-04-01 04:57:38,667 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2023-04-01 04:57:38,671 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 11 [2023-04-01 04:57:38,675 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2023-04-01 04:57:38,679 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 29 [2023-04-01 04:57:38,682 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 11 [2023-04-01 04:57:38,686 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2023-04-01 04:57:38,970 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2023-04-01 04:57:38,979 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2023-04-01 04:57:39,027 WARN L861 $PredicateComparison]: unable to prove that (let ((.cse1 (select (select |c_old(#memory_$Pointer$.offset)| |c_choose_next_#in~q.base|) |c_choose_next_#in~q.offset|))) (let ((.cse0 (select (select |c_old(#memory_$Pointer$.base)| |c_choose_next_#in~q.base|) |c_choose_next_#in~q.offset|)) (.cse2 (+ .cse1 8))) (or (not (= (select (select |c_old(#memory_int)| .cse0) (+ .cse1 4)) 1)) (exists ((v_ArrVal_1084 (Array Int Int))) (not (= (select (select (store |c_old(#memory_$Pointer$.offset)| |c_choose_next_#in~q.base| v_ArrVal_1084) .cse0) .cse2) 0))) (exists ((v_ArrVal_1078 (Array Int Int))) (not (= (select (select (store |c_old(#memory_$Pointer$.base)| |c_choose_next_#in~q.base| v_ArrVal_1078) .cse0) .cse2) 0)))))) is different from true [2023-04-01 04:57:39,040 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 2 not checked. [2023-04-01 04:57:39,040 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 04:57:39,740 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2023-04-01 04:57:39,805 WARN L839 $PredicateComparison]: unable to prove that (let ((.cse2 (select (select |c_#memory_$Pointer$.offset| |c_main_~#queue~0.base|) |c_main_~#queue~0.offset|))) (let ((.cse0 (select (select |c_#memory_$Pointer$.base| |c_main_~#queue~0.base|) |c_main_~#queue~0.offset|)) (.cse1 (+ .cse2 8))) (and (or (forall ((v_ArrVal_1104 (Array Int Int)) (v_ArrVal_1103 (Array Int Int))) (or (not (= (store |c_#memory_$Pointer$.offset| .cse0 v_ArrVal_1104) (store |c_#memory_$Pointer$.offset| |c_main_~#queue~0.base| v_ArrVal_1103))) (= (select v_ArrVal_1104 .cse1) 0))) (forall ((v_ArrVal_1107 (Array Int Int)) (v_ArrVal_1106 (Array Int Int))) (not (= (store |c_#memory_$Pointer$.base| |c_main_~#queue~0.base| v_ArrVal_1107) (store |c_#memory_$Pointer$.base| .cse0 v_ArrVal_1106))))) (forall ((v_ArrVal_1107 (Array Int Int)) (v_ArrVal_1106 (Array Int Int))) (or (= (select v_ArrVal_1106 .cse1) 0) (not (= (store |c_#memory_$Pointer$.base| |c_main_~#queue~0.base| v_ArrVal_1107) (store |c_#memory_$Pointer$.base| .cse0 v_ArrVal_1106))))) (= (select (select |c_#memory_int| .cse0) (+ .cse2 4)) 1) (forall ((v_ArrVal_1103 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| |c_main_~#queue~0.base| v_ArrVal_1103) .cse0) .cse1) 0)) (forall ((v_ArrVal_1104 (Array Int Int))) (or (forall ((v_ArrVal_1103 (Array Int Int))) (not (= (store |c_#memory_$Pointer$.offset| .cse0 v_ArrVal_1104) (store |c_#memory_$Pointer$.offset| |c_main_~#queue~0.base| v_ArrVal_1103)))) (= (select v_ArrVal_1104 .cse1) 0))) (forall ((v_ArrVal_1107 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| |c_main_~#queue~0.base| v_ArrVal_1107) .cse0) .cse1) 0))))) is different from false [2023-04-01 04:57:39,806 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1349260481] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 04:57:39,806 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1226762076] [2023-04-01 04:57:39,811 INFO L159 IcfgInterpreter]: Started Sifa with 31 locations of interest [2023-04-01 04:57:39,811 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 04:57:39,811 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 04:57:39,811 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 04:57:39,811 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 04:57:39,821 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-04-01 04:57:40,855 INFO L197 IcfgInterpreter]: Interpreting procedure check_queue with input of size 9 for LOIs [2023-04-01 04:57:40,878 INFO L197 IcfgInterpreter]: Interpreting procedure run_process with input of size 17 for LOIs [2023-04-01 04:57:40,879 INFO L197 IcfgInterpreter]: Interpreting procedure append_to_queue with input of size 35 for LOIs [2023-04-01 04:57:40,884 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 04:57:40,886 INFO L197 IcfgInterpreter]: Interpreting procedure choose_next with input of size 28 for LOIs [2023-04-01 04:57:40,953 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 04:57:42,256 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6348#(and (<= 1 |#StackHeapBarrier|) (= |check_queue_#in~q.base| check_queue_~q.base) (= |#NULL.offset| 0) (= check_queue_~q.offset |check_queue_#in~q.offset|) (= |#NULL.base| 0))' at error location [2023-04-01 04:57:42,257 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 04:57:42,257 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 04:57:42,257 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 21 [2023-04-01 04:57:42,257 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [383034524] [2023-04-01 04:57:42,257 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 04:57:42,257 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-04-01 04:57:42,257 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 04:57:42,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-04-01 04:57:42,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1294, Unknown=4, NotChecked=222, Total=1640 [2023-04-01 04:57:42,258 INFO L87 Difference]: Start difference. First operand 150 states and 186 transitions. Second operand has 21 states, 16 states have (on average 3.125) internal successors, (50), 19 states have internal predecessors, (50), 7 states have call successors, (11), 5 states have call predecessors, (11), 7 states have return successors, (9), 4 states have call predecessors, (9), 7 states have call successors, (9) [2023-04-01 04:57:43,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 04:57:43,845 INFO L93 Difference]: Finished difference Result 216 states and 274 transitions. [2023-04-01 04:57:43,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-04-01 04:57:43,851 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 16 states have (on average 3.125) internal successors, (50), 19 states have internal predecessors, (50), 7 states have call successors, (11), 5 states have call predecessors, (11), 7 states have return successors, (9), 4 states have call predecessors, (9), 7 states have call successors, (9) Word has length 41 [2023-04-01 04:57:43,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 04:57:43,851 INFO L225 Difference]: With dead ends: 216 [2023-04-01 04:57:43,851 INFO L226 Difference]: Without dead ends: 159 [2023-04-01 04:57:43,852 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 63 SyntacticMatches, 7 SemanticMatches, 50 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 604 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=181, Invalid=2176, Unknown=7, NotChecked=288, Total=2652 [2023-04-01 04:57:43,853 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 41 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 549 mSolverCounterSat, 14 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 721 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 549 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 157 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2023-04-01 04:57:43,853 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 152 Invalid, 721 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 549 Invalid, 1 Unknown, 157 Unchecked, 1.2s Time] [2023-04-01 04:57:43,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2023-04-01 04:57:43,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 150. [2023-04-01 04:57:43,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 107 states have (on average 1.2149532710280373) internal successors, (130), 114 states have internal predecessors, (130), 24 states have call successors, (24), 17 states have call predecessors, (24), 18 states have return successors, (31), 18 states have call predecessors, (31), 23 states have call successors, (31) [2023-04-01 04:57:43,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 185 transitions. [2023-04-01 04:57:43,869 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 185 transitions. Word has length 41 [2023-04-01 04:57:43,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 04:57:43,869 INFO L495 AbstractCegarLoop]: Abstraction has 150 states and 185 transitions. [2023-04-01 04:57:43,869 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 16 states have (on average 3.125) internal successors, (50), 19 states have internal predecessors, (50), 7 states have call successors, (11), 5 states have call predecessors, (11), 7 states have return successors, (9), 4 states have call predecessors, (9), 7 states have call successors, (9) [2023-04-01 04:57:43,869 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 185 transitions. [2023-04-01 04:57:43,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2023-04-01 04:57:43,870 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 04:57:43,870 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 04:57:43,876 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-04-01 04:57:44,077 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 04:57:44,077 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting check_queueErr0ASSERT_VIOLATIONERROR_FUNCTION === [check_queueErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 04:57:44,077 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 04:57:44,078 INFO L85 PathProgramCache]: Analyzing trace with hash 647593853, now seen corresponding path program 3 times [2023-04-01 04:57:44,078 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 04:57:44,078 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476077728] [2023-04-01 04:57:44,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 04:57:44,078 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 04:57:44,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 04:57:44,627 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 14 proven. 8 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-01 04:57:44,627 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 04:57:44,627 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1476077728] [2023-04-01 04:57:44,627 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1476077728] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 04:57:44,627 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1085058694] [2023-04-01 04:57:44,627 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 04:57:44,628 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 04:57:44,628 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 04:57:44,629 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 04:57:44,630 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-04-01 04:57:44,984 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 04:57:44,984 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 04:57:44,987 INFO L262 TraceCheckSpWp]: Trace formula consists of 431 conjuncts, 62 conjunts are in the unsatisfiable core [2023-04-01 04:57:44,989 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 04:57:45,104 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 15 [2023-04-01 04:57:45,144 INFO L321 Elim1Store]: treesize reduction 26, result has 42.2 percent of original size [2023-04-01 04:57:45,145 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 36 treesize of output 74 [2023-04-01 04:57:45,154 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-01 04:57:45,166 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-01 04:57:45,199 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 04:57:45,200 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 5 [2023-04-01 04:57:45,201 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 04:57:45,219 INFO L321 Elim1Store]: treesize reduction 26, result has 42.2 percent of original size [2023-04-01 04:57:45,219 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 36 treesize of output 74 [2023-04-01 04:57:45,224 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-01 04:57:45,231 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-04-01 04:57:45,277 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 11 [2023-04-01 04:57:45,280 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 04:57:45,367 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 32 [2023-04-01 04:57:45,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:45,371 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2023-04-01 04:57:45,407 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 63 treesize of output 35 [2023-04-01 04:57:45,411 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:45,413 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 04:57:45,413 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-04-01 04:57:45,474 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 15 treesize of output 7 [2023-04-01 04:57:45,491 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 17 proven. 5 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-01 04:57:45,491 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 04:57:45,686 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1085058694] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 04:57:45,686 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1693577266] [2023-04-01 04:57:45,688 INFO L159 IcfgInterpreter]: Started Sifa with 31 locations of interest [2023-04-01 04:57:45,688 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 04:57:45,688 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 04:57:45,688 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 04:57:45,688 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 04:57:45,697 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs