./Ultimate.py --spec ../sv-benchmarks/c/properties/valid-memsafety.prp --file ../sv-benchmarks/c/memsafety-ext2/split_list_test05-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version e19ca921 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerMemDerefMemtrack.xml -i ../sv-benchmarks/c/memsafety-ext2/split_list_test05-2.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash db322df1d89bf1549765f136e3e3b8000484c0c3108c31998992cf725d6dcc20 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-e19ca92 [2021-12-22 16:33:12,793 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-22 16:33:12,794 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-22 16:33:12,836 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-22 16:33:12,836 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-22 16:33:12,837 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-22 16:33:12,838 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-22 16:33:12,839 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-22 16:33:12,841 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-22 16:33:12,841 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-22 16:33:12,842 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-22 16:33:12,843 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-22 16:33:12,843 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-22 16:33:12,844 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-22 16:33:12,845 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-22 16:33:12,846 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-22 16:33:12,846 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-22 16:33:12,851 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-22 16:33:12,855 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-22 16:33:12,858 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-22 16:33:12,862 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-22 16:33:12,863 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-22 16:33:12,864 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-22 16:33:12,865 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-22 16:33:12,867 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-22 16:33:12,869 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-22 16:33:12,869 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-22 16:33:12,870 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-22 16:33:12,871 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-22 16:33:12,871 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-22 16:33:12,872 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-22 16:33:12,873 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-22 16:33:12,874 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-22 16:33:12,875 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-22 16:33:12,876 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-22 16:33:12,877 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-22 16:33:12,877 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-22 16:33:12,878 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-22 16:33:12,878 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-22 16:33:12,878 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-22 16:33:12,879 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-22 16:33:12,880 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-12-22 16:33:12,915 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-22 16:33:12,916 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-22 16:33:12,916 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-22 16:33:12,916 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-22 16:33:12,917 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-22 16:33:12,917 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-22 16:33:12,918 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-22 16:33:12,918 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-22 16:33:12,918 INFO L138 SettingsManager]: * Use SBE=true [2021-12-22 16:33:12,918 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-22 16:33:12,919 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-22 16:33:12,920 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-22 16:33:12,920 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-22 16:33:12,920 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-22 16:33:12,920 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-22 16:33:12,921 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-22 16:33:12,921 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-22 16:33:12,921 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-12-22 16:33:12,921 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-22 16:33:12,921 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-22 16:33:12,922 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-22 16:33:12,922 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-22 16:33:12,922 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-22 16:33:12,922 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-22 16:33:12,922 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-22 16:33:12,923 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 16:33:12,923 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-22 16:33:12,923 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-22 16:33:12,923 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-22 16:33:12,923 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-22 16:33:12,924 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-22 16:33:12,924 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> db322df1d89bf1549765f136e3e3b8000484c0c3108c31998992cf725d6dcc20 [2021-12-22 16:33:13,153 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-22 16:33:13,183 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-22 16:33:13,186 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-22 16:33:13,187 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-22 16:33:13,188 INFO L275 PluginConnector]: CDTParser initialized [2021-12-22 16:33:13,189 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/memsafety-ext2/split_list_test05-2.i [2021-12-22 16:33:13,243 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/72f05960d/a735dc8c8ce34057bcfd1dac36ac7e66/FLAG5e196f49f [2021-12-22 16:33:13,670 INFO L306 CDTParser]: Found 1 translation units. [2021-12-22 16:33:13,671 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/memsafety-ext2/split_list_test05-2.i [2021-12-22 16:33:13,681 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/72f05960d/a735dc8c8ce34057bcfd1dac36ac7e66/FLAG5e196f49f [2021-12-22 16:33:13,691 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/72f05960d/a735dc8c8ce34057bcfd1dac36ac7e66 [2021-12-22 16:33:13,693 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-22 16:33:13,694 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-22 16:33:13,698 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-22 16:33:13,698 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-22 16:33:13,705 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-22 16:33:13,706 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 04:33:13" (1/1) ... [2021-12-22 16:33:13,707 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@d9d5f33 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:33:13, skipping insertion in model container [2021-12-22 16:33:13,708 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 04:33:13" (1/1) ... [2021-12-22 16:33:13,714 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-22 16:33:13,742 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-22 16:33:14,005 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 16:33:14,014 INFO L203 MainTranslator]: Completed pre-run [2021-12-22 16:33:14,096 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 16:33:14,124 INFO L208 MainTranslator]: Completed translation [2021-12-22 16:33:14,125 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:33:14 WrapperNode [2021-12-22 16:33:14,125 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-22 16:33:14,126 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-22 16:33:14,127 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-22 16:33:14,128 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-22 16:33:14,134 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:33:14" (1/1) ... [2021-12-22 16:33:14,168 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:33:14" (1/1) ... [2021-12-22 16:33:14,198 INFO L137 Inliner]: procedures = 125, calls = 95, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 302 [2021-12-22 16:33:14,199 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-22 16:33:14,200 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-22 16:33:14,200 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-22 16:33:14,200 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-22 16:33:14,213 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:33:14" (1/1) ... [2021-12-22 16:33:14,213 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:33:14" (1/1) ... [2021-12-22 16:33:14,230 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:33:14" (1/1) ... [2021-12-22 16:33:14,232 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:33:14" (1/1) ... [2021-12-22 16:33:14,243 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:33:14" (1/1) ... [2021-12-22 16:33:14,264 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:33:14" (1/1) ... [2021-12-22 16:33:14,266 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:33:14" (1/1) ... [2021-12-22 16:33:14,269 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-22 16:33:14,277 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-22 16:33:14,277 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-22 16:33:14,277 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-22 16:33:14,278 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:33:14" (1/1) ... [2021-12-22 16:33:14,287 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 16:33:14,298 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 16:33:14,313 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) [2021-12-22 16:33:14,340 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 [2021-12-22 16:33:14,358 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-12-22 16:33:14,358 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-12-22 16:33:14,359 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-22 16:33:14,359 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-22 16:33:14,359 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-12-22 16:33:14,359 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-12-22 16:33:14,359 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-22 16:33:14,360 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-22 16:33:14,360 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-22 16:33:14,360 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-22 16:33:14,360 INFO L130 BoogieDeclarations]: Found specification of procedure append [2021-12-22 16:33:14,360 INFO L138 BoogieDeclarations]: Found implementation of procedure append [2021-12-22 16:33:14,452 INFO L234 CfgBuilder]: Building ICFG [2021-12-22 16:33:14,453 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-22 16:33:15,017 INFO L275 CfgBuilder]: Performing block encoding [2021-12-22 16:33:15,024 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-22 16:33:15,025 INFO L299 CfgBuilder]: Removed 11 assume(true) statements. [2021-12-22 16:33:15,027 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 04:33:15 BoogieIcfgContainer [2021-12-22 16:33:15,027 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-22 16:33:15,028 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-22 16:33:15,029 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-22 16:33:15,031 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-22 16:33:15,032 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 04:33:13" (1/3) ... [2021-12-22 16:33:15,032 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c4dbca3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 04:33:15, skipping insertion in model container [2021-12-22 16:33:15,033 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:33:14" (2/3) ... [2021-12-22 16:33:15,033 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c4dbca3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 04:33:15, skipping insertion in model container [2021-12-22 16:33:15,033 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 04:33:15" (3/3) ... [2021-12-22 16:33:15,034 INFO L111 eAbstractionObserver]: Analyzing ICFG split_list_test05-2.i [2021-12-22 16:33:15,039 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-22 16:33:15,039 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 147 error locations. [2021-12-22 16:33:15,075 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-22 16:33:15,081 INFO L339 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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, mLoopAccelerationTechnique=FAST_UPR [2021-12-22 16:33:15,081 INFO L340 AbstractCegarLoop]: Starting to check reachability of 147 error locations. [2021-12-22 16:33:15,098 INFO L276 IsEmpty]: Start isEmpty. Operand has 323 states, 159 states have (on average 2.138364779874214) internal successors, (340), 308 states have internal predecessors, (340), 15 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-12-22 16:33:15,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-12-22 16:33:15,103 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:33:15,103 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-12-22 16:33:15,104 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 143 more)] === [2021-12-22 16:33:15,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:33:15,114 INFO L85 PathProgramCache]: Analyzing trace with hash 29857, now seen corresponding path program 1 times [2021-12-22 16:33:15,120 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:33:15,121 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1758048333] [2021-12-22 16:33:15,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:33:15,122 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:33:15,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:15,258 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:33:15,258 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:33:15,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1758048333] [2021-12-22 16:33:15,259 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1758048333] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:33:15,259 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:33:15,260 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 16:33:15,262 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [62729721] [2021-12-22 16:33:15,262 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:33:15,266 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 16:33:15,267 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:33:15,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 16:33:15,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 16:33:15,302 INFO L87 Difference]: Start difference. First operand has 323 states, 159 states have (on average 2.138364779874214) internal successors, (340), 308 states have internal predecessors, (340), 15 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:33:15,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:33:15,635 INFO L93 Difference]: Finished difference Result 548 states and 601 transitions. [2021-12-22 16:33:15,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 16:33:15,638 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2021-12-22 16:33:15,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:33:15,656 INFO L225 Difference]: With dead ends: 548 [2021-12-22 16:33:15,656 INFO L226 Difference]: Without dead ends: 546 [2021-12-22 16:33:15,658 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 16:33:15,662 INFO L933 BasicCegarLoop]: 245 mSDtfsCounter, 246 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 255 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 246 SdHoareTripleChecker+Valid, 449 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 255 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 16:33:15,663 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [246 Valid, 449 Invalid, 258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 255 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-22 16:33:15,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 546 states. [2021-12-22 16:33:15,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 546 to 407. [2021-12-22 16:33:15,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 407 states, 246 states have (on average 2.089430894308943) internal successors, (514), 392 states have internal predecessors, (514), 15 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-12-22 16:33:15,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 407 states to 407 states and 544 transitions. [2021-12-22 16:33:15,740 INFO L78 Accepts]: Start accepts. Automaton has 407 states and 544 transitions. Word has length 3 [2021-12-22 16:33:15,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:33:15,740 INFO L470 AbstractCegarLoop]: Abstraction has 407 states and 544 transitions. [2021-12-22 16:33:15,741 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:33:15,741 INFO L276 IsEmpty]: Start isEmpty. Operand 407 states and 544 transitions. [2021-12-22 16:33:15,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-12-22 16:33:15,741 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:33:15,742 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-12-22 16:33:15,742 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-22 16:33:15,742 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 143 more)] === [2021-12-22 16:33:15,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:33:15,743 INFO L85 PathProgramCache]: Analyzing trace with hash 29858, now seen corresponding path program 1 times [2021-12-22 16:33:15,743 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:33:15,743 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1013843994] [2021-12-22 16:33:15,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:33:15,744 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:33:15,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:15,779 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:33:15,779 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:33:15,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1013843994] [2021-12-22 16:33:15,780 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1013843994] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:33:15,780 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:33:15,780 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 16:33:15,780 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765528273] [2021-12-22 16:33:15,781 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:33:15,782 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 16:33:15,782 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:33:15,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 16:33:15,783 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 16:33:15,783 INFO L87 Difference]: Start difference. First operand 407 states and 544 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:33:15,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:33:15,938 INFO L93 Difference]: Finished difference Result 408 states and 547 transitions. [2021-12-22 16:33:15,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 16:33:15,938 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2021-12-22 16:33:15,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:33:15,941 INFO L225 Difference]: With dead ends: 408 [2021-12-22 16:33:15,941 INFO L226 Difference]: Without dead ends: 408 [2021-12-22 16:33:15,941 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 16:33:15,942 INFO L933 BasicCegarLoop]: 352 mSDtfsCounter, 6 mSDsluCounter, 215 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 567 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 16:33:15,943 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 567 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 16:33:15,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2021-12-22 16:33:15,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 405. [2021-12-22 16:33:15,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 405 states, 246 states have (on average 2.0813008130081303) internal successors, (512), 390 states have internal predecessors, (512), 15 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-12-22 16:33:15,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 405 states to 405 states and 542 transitions. [2021-12-22 16:33:15,959 INFO L78 Accepts]: Start accepts. Automaton has 405 states and 542 transitions. Word has length 3 [2021-12-22 16:33:15,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:33:15,960 INFO L470 AbstractCegarLoop]: Abstraction has 405 states and 542 transitions. [2021-12-22 16:33:15,960 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:33:15,960 INFO L276 IsEmpty]: Start isEmpty. Operand 405 states and 542 transitions. [2021-12-22 16:33:15,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-12-22 16:33:15,961 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:33:15,961 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:33:15,961 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-22 16:33:15,961 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting appendErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 143 more)] === [2021-12-22 16:33:15,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:33:15,962 INFO L85 PathProgramCache]: Analyzing trace with hash 1117386190, now seen corresponding path program 1 times [2021-12-22 16:33:15,962 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:33:15,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1152738184] [2021-12-22 16:33:15,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:33:15,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:33:15,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:16,008 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:33:16,008 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:33:16,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1152738184] [2021-12-22 16:33:16,009 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1152738184] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:33:16,009 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:33:16,009 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 16:33:16,009 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [395601803] [2021-12-22 16:33:16,009 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:33:16,010 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 16:33:16,010 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:33:16,010 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 16:33:16,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 16:33:16,011 INFO L87 Difference]: Start difference. First operand 405 states and 542 transitions. Second operand has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:33:16,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:33:16,192 INFO L93 Difference]: Finished difference Result 400 states and 537 transitions. [2021-12-22 16:33:16,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 16:33:16,192 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-12-22 16:33:16,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:33:16,194 INFO L225 Difference]: With dead ends: 400 [2021-12-22 16:33:16,194 INFO L226 Difference]: Without dead ends: 400 [2021-12-22 16:33:16,195 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 16:33:16,196 INFO L933 BasicCegarLoop]: 322 mSDtfsCounter, 43 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 496 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 16:33:16,196 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 496 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 156 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-22 16:33:16,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 400 states. [2021-12-22 16:33:16,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 400 to 400. [2021-12-22 16:33:16,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 400 states, 246 states have (on average 2.0609756097560976) internal successors, (507), 385 states have internal predecessors, (507), 15 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-12-22 16:33:16,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 537 transitions. [2021-12-22 16:33:16,207 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 537 transitions. Word has length 10 [2021-12-22 16:33:16,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:33:16,208 INFO L470 AbstractCegarLoop]: Abstraction has 400 states and 537 transitions. [2021-12-22 16:33:16,208 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:33:16,208 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 537 transitions. [2021-12-22 16:33:16,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-12-22 16:33:16,209 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:33:16,209 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:33:16,209 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-12-22 16:33:16,209 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting appendErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 143 more)] === [2021-12-22 16:33:16,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:33:16,210 INFO L85 PathProgramCache]: Analyzing trace with hash 1117386191, now seen corresponding path program 1 times [2021-12-22 16:33:16,210 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:33:16,210 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [256306492] [2021-12-22 16:33:16,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:33:16,211 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:33:16,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:16,255 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:33:16,255 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:33:16,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [256306492] [2021-12-22 16:33:16,256 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [256306492] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:33:16,256 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:33:16,256 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 16:33:16,256 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500047101] [2021-12-22 16:33:16,256 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:33:16,257 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 16:33:16,257 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:33:16,257 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 16:33:16,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 16:33:16,258 INFO L87 Difference]: Start difference. First operand 400 states and 537 transitions. Second operand has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:33:16,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:33:16,431 INFO L93 Difference]: Finished difference Result 395 states and 532 transitions. [2021-12-22 16:33:16,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 16:33:16,432 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-12-22 16:33:16,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:33:16,434 INFO L225 Difference]: With dead ends: 395 [2021-12-22 16:33:16,434 INFO L226 Difference]: Without dead ends: 395 [2021-12-22 16:33:16,434 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 16:33:16,435 INFO L933 BasicCegarLoop]: 322 mSDtfsCounter, 38 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 509 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 16:33:16,436 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 509 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 138 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-22 16:33:16,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 395 states. [2021-12-22 16:33:16,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 395 to 395. [2021-12-22 16:33:16,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 395 states, 246 states have (on average 2.040650406504065) internal successors, (502), 380 states have internal predecessors, (502), 15 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-12-22 16:33:16,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 532 transitions. [2021-12-22 16:33:16,446 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 532 transitions. Word has length 10 [2021-12-22 16:33:16,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:33:16,446 INFO L470 AbstractCegarLoop]: Abstraction has 395 states and 532 transitions. [2021-12-22 16:33:16,447 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:33:16,447 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 532 transitions. [2021-12-22 16:33:16,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-22 16:33:16,447 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:33:16,447 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:33:16,448 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-12-22 16:33:16,448 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting appendErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 143 more)] === [2021-12-22 16:33:16,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:33:16,449 INFO L85 PathProgramCache]: Analyzing trace with hash 279233943, now seen corresponding path program 1 times [2021-12-22 16:33:16,449 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:33:16,449 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1402269850] [2021-12-22 16:33:16,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:33:16,449 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:33:16,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:16,532 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:33:16,532 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:33:16,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1402269850] [2021-12-22 16:33:16,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1402269850] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:33:16,533 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:33:16,533 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-22 16:33:16,533 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302531488] [2021-12-22 16:33:16,533 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:33:16,534 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-22 16:33:16,534 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:33:16,534 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-22 16:33:16,534 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-12-22 16:33:16,535 INFO L87 Difference]: Start difference. First operand 395 states and 532 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:33:17,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:33:17,021 INFO L93 Difference]: Finished difference Result 523 states and 574 transitions. [2021-12-22 16:33:17,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-22 16:33:17,022 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-12-22 16:33:17,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:33:17,024 INFO L225 Difference]: With dead ends: 523 [2021-12-22 16:33:17,024 INFO L226 Difference]: Without dead ends: 523 [2021-12-22 16:33:17,024 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-12-22 16:33:17,025 INFO L933 BasicCegarLoop]: 185 mSDtfsCounter, 318 mSDsluCounter, 612 mSDsCounter, 0 mSdLazyCounter, 723 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 318 SdHoareTripleChecker+Valid, 797 SdHoareTripleChecker+Invalid, 762 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 723 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-22 16:33:17,025 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [318 Valid, 797 Invalid, 762 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 723 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-22 16:33:17,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 523 states. [2021-12-22 16:33:17,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 523 to 387. [2021-12-22 16:33:17,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 387 states, 246 states have (on average 2.008130081300813) internal successors, (494), 372 states have internal predecessors, (494), 15 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-12-22 16:33:17,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 387 states to 387 states and 524 transitions. [2021-12-22 16:33:17,037 INFO L78 Accepts]: Start accepts. Automaton has 387 states and 524 transitions. Word has length 11 [2021-12-22 16:33:17,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:33:17,039 INFO L470 AbstractCegarLoop]: Abstraction has 387 states and 524 transitions. [2021-12-22 16:33:17,039 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:33:17,040 INFO L276 IsEmpty]: Start isEmpty. Operand 387 states and 524 transitions. [2021-12-22 16:33:17,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-22 16:33:17,041 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:33:17,041 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:33:17,041 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-12-22 16:33:17,041 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting appendErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 143 more)] === [2021-12-22 16:33:17,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:33:17,049 INFO L85 PathProgramCache]: Analyzing trace with hash 279233944, now seen corresponding path program 1 times [2021-12-22 16:33:17,049 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:33:17,049 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1981231236] [2021-12-22 16:33:17,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:33:17,049 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:33:17,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:17,165 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:33:17,165 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:33:17,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1981231236] [2021-12-22 16:33:17,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1981231236] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:33:17,166 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:33:17,166 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-22 16:33:17,166 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353645530] [2021-12-22 16:33:17,166 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:33:17,167 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-22 16:33:17,167 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:33:17,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-22 16:33:17,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-12-22 16:33:17,168 INFO L87 Difference]: Start difference. First operand 387 states and 524 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:33:17,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:33:17,728 INFO L93 Difference]: Finished difference Result 513 states and 564 transitions. [2021-12-22 16:33:17,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-22 16:33:17,728 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-12-22 16:33:17,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:33:17,730 INFO L225 Difference]: With dead ends: 513 [2021-12-22 16:33:17,730 INFO L226 Difference]: Without dead ends: 513 [2021-12-22 16:33:17,731 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-12-22 16:33:17,731 INFO L933 BasicCegarLoop]: 133 mSDtfsCounter, 802 mSDsluCounter, 307 mSDsCounter, 0 mSdLazyCounter, 756 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 802 SdHoareTripleChecker+Valid, 440 SdHoareTripleChecker+Invalid, 817 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 756 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-22 16:33:17,732 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [802 Valid, 440 Invalid, 817 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 756 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-22 16:33:17,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 513 states. [2021-12-22 16:33:17,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 513 to 378. [2021-12-22 16:33:17,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 378 states, 246 states have (on average 1.967479674796748) internal successors, (484), 363 states have internal predecessors, (484), 15 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-12-22 16:33:17,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 514 transitions. [2021-12-22 16:33:17,742 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 514 transitions. Word has length 11 [2021-12-22 16:33:17,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:33:17,742 INFO L470 AbstractCegarLoop]: Abstraction has 378 states and 514 transitions. [2021-12-22 16:33:17,743 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:33:17,743 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 514 transitions. [2021-12-22 16:33:17,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-12-22 16:33:17,743 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:33:17,744 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:33:17,744 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-12-22 16:33:17,744 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting appendErr23REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 143 more)] === [2021-12-22 16:33:17,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:33:17,745 INFO L85 PathProgramCache]: Analyzing trace with hash 1620146378, now seen corresponding path program 1 times [2021-12-22 16:33:17,745 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:33:17,745 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2042259297] [2021-12-22 16:33:17,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:33:17,745 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:33:17,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:17,910 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:33:17,910 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:33:17,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2042259297] [2021-12-22 16:33:17,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2042259297] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:33:17,911 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:33:17,911 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-12-22 16:33:17,911 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601388019] [2021-12-22 16:33:17,911 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:33:17,912 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-22 16:33:17,912 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:33:17,912 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-22 16:33:17,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-12-22 16:33:17,913 INFO L87 Difference]: Start difference. First operand 378 states and 514 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:33:18,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:33:18,215 INFO L93 Difference]: Finished difference Result 398 states and 537 transitions. [2021-12-22 16:33:18,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-22 16:33:18,216 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-12-22 16:33:18,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:33:18,218 INFO L225 Difference]: With dead ends: 398 [2021-12-22 16:33:18,218 INFO L226 Difference]: Without dead ends: 398 [2021-12-22 16:33:18,218 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2021-12-22 16:33:18,219 INFO L933 BasicCegarLoop]: 314 mSDtfsCounter, 32 mSDsluCounter, 1268 mSDsCounter, 0 mSdLazyCounter, 375 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 1582 SdHoareTripleChecker+Invalid, 383 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 375 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 16:33:18,219 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 1582 Invalid, 383 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 375 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-22 16:33:18,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398 states. [2021-12-22 16:33:18,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398 to 386. [2021-12-22 16:33:18,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 386 states, 253 states have (on average 1.9446640316205535) internal successors, (492), 370 states have internal predecessors, (492), 16 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2021-12-22 16:33:18,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 386 states to 386 states and 524 transitions. [2021-12-22 16:33:18,229 INFO L78 Accepts]: Start accepts. Automaton has 386 states and 524 transitions. Word has length 20 [2021-12-22 16:33:18,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:33:18,230 INFO L470 AbstractCegarLoop]: Abstraction has 386 states and 524 transitions. [2021-12-22 16:33:18,230 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:33:18,230 INFO L276 IsEmpty]: Start isEmpty. Operand 386 states and 524 transitions. [2021-12-22 16:33:18,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-12-22 16:33:18,231 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:33:18,231 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:33:18,231 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-12-22 16:33:18,231 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting appendErr23REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 143 more)] === [2021-12-22 16:33:18,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:33:18,232 INFO L85 PathProgramCache]: Analyzing trace with hash 248818477, now seen corresponding path program 1 times [2021-12-22 16:33:18,232 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:33:18,232 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2089127335] [2021-12-22 16:33:18,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:33:18,233 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:33:18,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:18,402 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:33:18,403 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:33:18,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2089127335] [2021-12-22 16:33:18,403 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2089127335] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:33:18,403 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:33:18,404 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-12-22 16:33:18,404 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [879635250] [2021-12-22 16:33:18,404 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:33:18,405 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-22 16:33:18,405 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:33:18,405 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-22 16:33:18,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-12-22 16:33:18,406 INFO L87 Difference]: Start difference. First operand 386 states and 524 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:33:19,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:33:19,005 INFO L93 Difference]: Finished difference Result 526 states and 579 transitions. [2021-12-22 16:33:19,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-22 16:33:19,006 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-12-22 16:33:19,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:33:19,008 INFO L225 Difference]: With dead ends: 526 [2021-12-22 16:33:19,008 INFO L226 Difference]: Without dead ends: 526 [2021-12-22 16:33:19,008 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-12-22 16:33:19,009 INFO L933 BasicCegarLoop]: 206 mSDtfsCounter, 751 mSDsluCounter, 1136 mSDsCounter, 0 mSdLazyCounter, 935 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 766 SdHoareTripleChecker+Valid, 1342 SdHoareTripleChecker+Invalid, 955 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 935 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-22 16:33:19,009 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [766 Valid, 1342 Invalid, 955 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 935 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-22 16:33:19,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 526 states. [2021-12-22 16:33:19,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 526 to 389. [2021-12-22 16:33:19,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 389 states, 256 states have (on average 1.93359375) internal successors, (495), 373 states have internal predecessors, (495), 16 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2021-12-22 16:33:19,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 389 states to 389 states and 527 transitions. [2021-12-22 16:33:19,018 INFO L78 Accepts]: Start accepts. Automaton has 389 states and 527 transitions. Word has length 22 [2021-12-22 16:33:19,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:33:19,019 INFO L470 AbstractCegarLoop]: Abstraction has 389 states and 527 transitions. [2021-12-22 16:33:19,019 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:33:19,019 INFO L276 IsEmpty]: Start isEmpty. Operand 389 states and 527 transitions. [2021-12-22 16:33:19,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-12-22 16:33:19,020 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:33:19,020 INFO L514 BasicCegarLoop]: trace histogram [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, 1] [2021-12-22 16:33:19,020 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-12-22 16:33:19,020 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting appendErr23REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 143 more)] === [2021-12-22 16:33:19,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:33:19,021 INFO L85 PathProgramCache]: Analyzing trace with hash -1532217100, now seen corresponding path program 1 times [2021-12-22 16:33:19,021 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:33:19,021 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [558512561] [2021-12-22 16:33:19,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:33:19,022 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:33:19,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:19,244 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-22 16:33:19,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:19,511 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:33:19,511 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:33:19,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [558512561] [2021-12-22 16:33:19,512 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [558512561] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:33:19,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1914572144] [2021-12-22 16:33:19,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:33:19,512 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 16:33:19,512 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 16:33:19,514 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) [2021-12-22 16:33:19,541 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-22 16:33:19,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:19,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 66 conjunts are in the unsatisfiable core [2021-12-22 16:33:19,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:33:19,733 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 [2021-12-22 16:33:20,062 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-22 16:33:20,068 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-22 16:33:20,161 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-22 16:33:20,161 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 16 treesize of output 22 [2021-12-22 16:33:20,176 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-22 16:33:20,176 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 16 treesize of output 22 [2021-12-22 16:33:20,197 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 3 [2021-12-22 16:33:20,212 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 3 [2021-12-22 16:33:20,336 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-22 16:33:20,336 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 26 [2021-12-22 16:33:20,353 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-22 16:33:20,353 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 26 [2021-12-22 16:33:20,392 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 11 [2021-12-22 16:33:20,643 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:33:20,650 INFO L353 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2021-12-22 16:33:20,650 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 29 treesize of output 28 [2021-12-22 16:33:20,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:33:20,839 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 26 treesize of output 28 [2021-12-22 16:33:20,856 INFO L353 Elim1Store]: treesize reduction 8, result has 65.2 percent of original size [2021-12-22 16:33:20,857 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 22 treesize of output 24 [2021-12-22 16:33:20,930 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 46 treesize of output 44 [2021-12-22 16:33:20,936 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 35 treesize of output 35 [2021-12-22 16:33:21,119 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 46 treesize of output 44 [2021-12-22 16:33:21,124 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 35 treesize of output 35 [2021-12-22 16:33:21,200 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 46 treesize of output 44 [2021-12-22 16:33:21,206 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 35 treesize of output 35 [2021-12-22 16:33:21,275 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:33:21,276 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 21 [2021-12-22 16:33:21,280 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:33:21,281 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 14 [2021-12-22 16:33:21,308 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:33:21,308 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:33:21,390 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_329 (Array Int Int)) (v_ArrVal_330 (Array Int Int))) (let ((.cse0 (+ c_append_~head.offset 4))) (<= (+ 9 (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_330) c_append_~head.base) .cse0)) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_329) c_append_~head.base) .cse0))))) (forall ((v_ArrVal_330 (Array Int Int))) (<= 0 (+ 5 (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_330) c_append_~head.base) (+ c_append_~head.offset 4)))))) is different from false [2021-12-22 16:33:21,895 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:21,896 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 82 treesize of output 83 [2021-12-22 16:33:21,904 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:21,904 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 83 treesize of output 73 [2021-12-22 16:33:21,909 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:33:21,917 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:21,917 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 103 treesize of output 103 [2021-12-22 16:33:21,924 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:33:21,932 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:21,932 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 152 treesize of output 140 [2021-12-22 16:33:21,953 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:21,954 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 216 treesize of output 230 [2021-12-22 16:33:21,964 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 230 treesize of output 206 [2021-12-22 16:33:21,974 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 206 treesize of output 186 [2021-12-22 16:33:23,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1914572144] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:33:23,296 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:33:23,296 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 26 [2021-12-22 16:33:23,296 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948206160] [2021-12-22 16:33:23,296 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:33:23,296 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-22 16:33:23,297 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:33:23,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-22 16:33:23,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=896, Unknown=4, NotChecked=60, Total=1056 [2021-12-22 16:33:23,297 INFO L87 Difference]: Start difference. First operand 389 states and 527 transitions. Second operand has 27 states, 26 states have (on average 2.576923076923077) internal successors, (67), 23 states have internal predecessors, (67), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-22 16:33:25,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:33:25,870 INFO L93 Difference]: Finished difference Result 454 states and 616 transitions. [2021-12-22 16:33:25,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-12-22 16:33:25,871 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.576923076923077) internal successors, (67), 23 states have internal predecessors, (67), 4 states have call successors, (4), 4 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 37 [2021-12-22 16:33:25,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:33:25,874 INFO L225 Difference]: With dead ends: 454 [2021-12-22 16:33:25,874 INFO L226 Difference]: Without dead ends: 454 [2021-12-22 16:33:25,874 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 1 IntricatePredicates, 1 DeprecatedPredicates, 379 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=273, Invalid=1889, Unknown=4, NotChecked=90, Total=2256 [2021-12-22 16:33:25,875 INFO L933 BasicCegarLoop]: 317 mSDtfsCounter, 127 mSDsluCounter, 3866 mSDsCounter, 0 mSdLazyCounter, 2608 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 4183 SdHoareTripleChecker+Invalid, 3696 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 2608 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1043 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-12-22 16:33:25,875 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [127 Valid, 4183 Invalid, 3696 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 2608 Invalid, 0 Unknown, 1043 Unchecked, 1.4s Time] [2021-12-22 16:33:25,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 454 states. [2021-12-22 16:33:25,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 454 to 445. [2021-12-22 16:33:25,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 445 states, 306 states have (on average 1.8169934640522876) internal successors, (556), 425 states have internal predecessors, (556), 19 states have call successors, (19), 4 states have call predecessors, (19), 4 states have return successors, (36), 17 states have call predecessors, (36), 19 states have call successors, (36) [2021-12-22 16:33:25,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 611 transitions. [2021-12-22 16:33:25,889 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 611 transitions. Word has length 37 [2021-12-22 16:33:25,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:33:25,889 INFO L470 AbstractCegarLoop]: Abstraction has 445 states and 611 transitions. [2021-12-22 16:33:25,889 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 2.576923076923077) internal successors, (67), 23 states have internal predecessors, (67), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-22 16:33:25,889 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 611 transitions. [2021-12-22 16:33:25,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-12-22 16:33:25,890 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:33:25,891 INFO L514 BasicCegarLoop]: trace histogram [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, 1] [2021-12-22 16:33:25,916 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-12-22 16:33:26,115 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 16:33:26,116 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting appendErr22REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 143 more)] === [2021-12-22 16:33:26,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:33:26,116 INFO L85 PathProgramCache]: Analyzing trace with hash -1532217101, now seen corresponding path program 1 times [2021-12-22 16:33:26,117 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:33:26,117 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1762103044] [2021-12-22 16:33:26,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:33:26,117 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:33:26,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:26,343 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-22 16:33:26,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:26,515 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:33:26,516 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:33:26,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1762103044] [2021-12-22 16:33:26,516 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1762103044] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:33:26,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [619624360] [2021-12-22 16:33:26,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:33:26,516 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 16:33:26,516 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 16:33:26,517 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) [2021-12-22 16:33:26,534 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-22 16:33:26,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:26,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 47 conjunts are in the unsatisfiable core [2021-12-22 16:33:26,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:33:26,649 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 [2021-12-22 16:33:26,879 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-22 16:33:26,937 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-22 16:33:26,937 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 16 treesize of output 22 [2021-12-22 16:33:26,948 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 3 [2021-12-22 16:33:27,035 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-22 16:33:27,035 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 26 [2021-12-22 16:33:27,155 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:33:27,162 INFO L353 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2021-12-22 16:33:27,162 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 29 treesize of output 28 [2021-12-22 16:33:27,346 INFO L353 Elim1Store]: treesize reduction 54, result has 36.5 percent of original size [2021-12-22 16:33:27,346 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 28 treesize of output 45 [2021-12-22 16:33:27,402 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 38 treesize of output 36 [2021-12-22 16:33:27,539 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 38 treesize of output 36 [2021-12-22 16:33:27,585 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 38 treesize of output 36 [2021-12-22 16:33:27,634 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:33:27,635 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 13 [2021-12-22 16:33:27,670 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:33:27,670 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:33:27,936 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:27,936 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 34 [2021-12-22 16:33:27,945 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:27,945 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 170 treesize of output 122 [2021-12-22 16:33:27,950 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 86 treesize of output 78 [2021-12-22 16:33:27,955 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 40 treesize of output 36 [2021-12-22 16:33:28,731 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [619624360] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:33:28,731 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:33:28,731 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 27 [2021-12-22 16:33:28,731 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671665574] [2021-12-22 16:33:28,731 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:33:28,732 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-12-22 16:33:28,732 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:33:28,732 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-12-22 16:33:28,732 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=940, Unknown=10, NotChecked=0, Total=1056 [2021-12-22 16:33:28,733 INFO L87 Difference]: Start difference. First operand 445 states and 611 transitions. Second operand has 28 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 24 states have internal predecessors, (67), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-22 16:33:29,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:33:29,824 INFO L93 Difference]: Finished difference Result 482 states and 647 transitions. [2021-12-22 16:33:29,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-12-22 16:33:29,825 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 24 states have internal predecessors, (67), 4 states have call successors, (4), 4 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 37 [2021-12-22 16:33:29,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:33:29,829 INFO L225 Difference]: With dead ends: 482 [2021-12-22 16:33:29,829 INFO L226 Difference]: Without dead ends: 482 [2021-12-22 16:33:29,830 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 361 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=172, Invalid=1378, Unknown=10, NotChecked=0, Total=1560 [2021-12-22 16:33:29,830 INFO L933 BasicCegarLoop]: 308 mSDtfsCounter, 81 mSDsluCounter, 3767 mSDsCounter, 0 mSdLazyCounter, 1679 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 4075 SdHoareTripleChecker+Invalid, 2443 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 1679 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 743 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-12-22 16:33:29,830 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 4075 Invalid, 2443 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 1679 Invalid, 0 Unknown, 743 Unchecked, 0.8s Time] [2021-12-22 16:33:29,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 482 states. [2021-12-22 16:33:29,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 482 to 476. [2021-12-22 16:33:29,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 476 states, 335 states have (on average 1.7552238805970148) internal successors, (588), 455 states have internal predecessors, (588), 19 states have call successors, (19), 5 states have call predecessors, (19), 6 states have return successors, (36), 17 states have call predecessors, (36), 19 states have call successors, (36) [2021-12-22 16:33:29,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476 states to 476 states and 643 transitions. [2021-12-22 16:33:29,848 INFO L78 Accepts]: Start accepts. Automaton has 476 states and 643 transitions. Word has length 37 [2021-12-22 16:33:29,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:33:29,848 INFO L470 AbstractCegarLoop]: Abstraction has 476 states and 643 transitions. [2021-12-22 16:33:29,849 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 24 states have internal predecessors, (67), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-22 16:33:29,849 INFO L276 IsEmpty]: Start isEmpty. Operand 476 states and 643 transitions. [2021-12-22 16:33:29,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-22 16:33:29,853 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:33:29,853 INFO L514 BasicCegarLoop]: 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] [2021-12-22 16:33:29,883 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-22 16:33:30,067 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-12-22 16:33:30,067 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting appendErr23REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 143 more)] === [2021-12-22 16:33:30,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:33:30,068 INFO L85 PathProgramCache]: Analyzing trace with hash -568836631, now seen corresponding path program 1 times [2021-12-22 16:33:30,068 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:33:30,068 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724315143] [2021-12-22 16:33:30,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:33:30,068 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:33:30,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:30,303 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-22 16:33:30,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:30,555 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:33:30,556 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:33:30,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1724315143] [2021-12-22 16:33:30,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1724315143] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:33:30,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [886513713] [2021-12-22 16:33:30,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:33:30,556 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 16:33:30,557 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 16:33:30,557 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) [2021-12-22 16:33:30,558 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-22 16:33:30,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:30,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 64 conjunts are in the unsatisfiable core [2021-12-22 16:33:30,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:33:30,679 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 [2021-12-22 16:33:30,919 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-22 16:33:30,923 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-22 16:33:30,985 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-22 16:33:30,987 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 16 treesize of output 22 [2021-12-22 16:33:31,000 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-22 16:33:31,000 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 16 treesize of output 22 [2021-12-22 16:33:31,016 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 3 [2021-12-22 16:33:31,028 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 3 [2021-12-22 16:33:31,131 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-22 16:33:31,132 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 26 [2021-12-22 16:33:31,147 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-22 16:33:31,147 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 26 [2021-12-22 16:33:31,196 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 11 [2021-12-22 16:33:31,379 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:33:31,387 INFO L353 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2021-12-22 16:33:31,387 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 29 treesize of output 28 [2021-12-22 16:33:31,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:33:31,583 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 26 treesize of output 28 [2021-12-22 16:33:31,593 INFO L353 Elim1Store]: treesize reduction 8, result has 65.2 percent of original size [2021-12-22 16:33:31,594 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 22 treesize of output 24 [2021-12-22 16:33:31,682 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 46 treesize of output 44 [2021-12-22 16:33:31,687 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 35 treesize of output 35 [2021-12-22 16:33:31,824 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 46 treesize of output 44 [2021-12-22 16:33:31,828 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 35 treesize of output 35 [2021-12-22 16:33:31,876 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 46 treesize of output 44 [2021-12-22 16:33:31,880 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 35 treesize of output 35 [2021-12-22 16:33:31,939 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:33:31,940 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 21 [2021-12-22 16:33:31,944 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:33:31,944 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 14 [2021-12-22 16:33:31,978 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:33:31,978 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:33:32,037 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_706 (Array Int Int)) (v_ArrVal_705 (Array Int Int))) (let ((.cse0 (+ c_append_~head.offset 4))) (<= (+ 9 (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_705) c_append_~head.base) .cse0)) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_706) c_append_~head.base) .cse0))))) (forall ((v_ArrVal_705 (Array Int Int))) (<= 0 (+ 5 (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_705) c_append_~head.base) (+ c_append_~head.offset 4)))))) is different from false [2021-12-22 16:33:32,497 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:32,498 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 82 treesize of output 83 [2021-12-22 16:33:32,506 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:32,507 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 83 treesize of output 73 [2021-12-22 16:33:32,511 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:33:32,517 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:32,517 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 103 treesize of output 103 [2021-12-22 16:33:32,523 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:33:32,530 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:32,530 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 152 treesize of output 140 [2021-12-22 16:33:32,549 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:32,549 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 216 treesize of output 230 [2021-12-22 16:33:32,556 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 230 treesize of output 206 [2021-12-22 16:33:32,563 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 206 treesize of output 186 [2021-12-22 16:33:34,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [886513713] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:33:34,019 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:33:34,019 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 26 [2021-12-22 16:33:34,019 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846228632] [2021-12-22 16:33:34,019 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:33:34,020 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-22 16:33:34,020 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:33:34,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-22 16:33:34,020 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=897, Unknown=4, NotChecked=60, Total=1056 [2021-12-22 16:33:34,021 INFO L87 Difference]: Start difference. First operand 476 states and 643 transitions. Second operand has 27 states, 26 states have (on average 2.730769230769231) internal successors, (71), 23 states have internal predecessors, (71), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-22 16:33:35,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:33:35,536 INFO L93 Difference]: Finished difference Result 515 states and 692 transitions. [2021-12-22 16:33:35,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-22 16:33:35,536 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.730769230769231) internal successors, (71), 23 states have internal predecessors, (71), 4 states have call successors, (4), 4 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 39 [2021-12-22 16:33:35,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:33:35,540 INFO L225 Difference]: With dead ends: 515 [2021-12-22 16:33:35,540 INFO L226 Difference]: Without dead ends: 515 [2021-12-22 16:33:35,541 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=190, Invalid=1616, Unknown=4, NotChecked=82, Total=1892 [2021-12-22 16:33:35,542 INFO L933 BasicCegarLoop]: 314 mSDtfsCounter, 61 mSDsluCounter, 3378 mSDsCounter, 0 mSdLazyCounter, 2047 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 3692 SdHoareTripleChecker+Invalid, 2796 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 2047 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 715 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-12-22 16:33:35,542 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 3692 Invalid, 2796 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 2047 Invalid, 0 Unknown, 715 Unchecked, 0.9s Time] [2021-12-22 16:33:35,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 515 states. [2021-12-22 16:33:35,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 515 to 493. [2021-12-22 16:33:35,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 493 states, 351 states have (on average 1.735042735042735) internal successors, (609), 470 states have internal predecessors, (609), 20 states have call successors, (20), 6 states have call predecessors, (20), 6 states have return successors, (38), 18 states have call predecessors, (38), 20 states have call successors, (38) [2021-12-22 16:33:35,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 493 states to 493 states and 667 transitions. [2021-12-22 16:33:35,568 INFO L78 Accepts]: Start accepts. Automaton has 493 states and 667 transitions. Word has length 39 [2021-12-22 16:33:35,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:33:35,568 INFO L470 AbstractCegarLoop]: Abstraction has 493 states and 667 transitions. [2021-12-22 16:33:35,568 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 2.730769230769231) internal successors, (71), 23 states have internal predecessors, (71), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-22 16:33:35,569 INFO L276 IsEmpty]: Start isEmpty. Operand 493 states and 667 transitions. [2021-12-22 16:33:35,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-22 16:33:35,573 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:33:35,573 INFO L514 BasicCegarLoop]: 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] [2021-12-22 16:33:35,596 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-12-22 16:33:35,795 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 16:33:35,796 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting appendErr22REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 143 more)] === [2021-12-22 16:33:35,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:33:35,796 INFO L85 PathProgramCache]: Analyzing trace with hash -568836632, now seen corresponding path program 1 times [2021-12-22 16:33:35,796 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:33:35,796 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1853734149] [2021-12-22 16:33:35,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:33:35,796 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:33:35,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:35,986 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-22 16:33:35,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:36,167 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:33:36,167 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:33:36,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1853734149] [2021-12-22 16:33:36,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1853734149] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:33:36,168 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1057233638] [2021-12-22 16:33:36,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:33:36,168 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 16:33:36,168 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 16:33:36,169 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) [2021-12-22 16:33:36,193 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-22 16:33:36,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:36,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 49 conjunts are in the unsatisfiable core [2021-12-22 16:33:36,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:33:36,305 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 [2021-12-22 16:33:36,495 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-22 16:33:36,541 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-22 16:33:36,541 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 16 treesize of output 22 [2021-12-22 16:33:36,547 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 3 [2021-12-22 16:33:36,593 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-22 16:33:36,594 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 26 [2021-12-22 16:33:36,661 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:33:36,666 INFO L353 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2021-12-22 16:33:36,667 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 29 treesize of output 28 [2021-12-22 16:33:36,783 INFO L353 Elim1Store]: treesize reduction 54, result has 36.5 percent of original size [2021-12-22 16:33:36,784 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 28 treesize of output 45 [2021-12-22 16:33:36,836 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 38 treesize of output 36 [2021-12-22 16:33:36,976 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 38 treesize of output 36 [2021-12-22 16:33:37,023 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 38 treesize of output 36 [2021-12-22 16:33:37,074 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:33:37,075 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 13 [2021-12-22 16:33:37,104 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:33:37,105 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:33:37,512 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:37,512 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 34 [2021-12-22 16:33:37,521 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:37,522 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 170 treesize of output 122 [2021-12-22 16:33:37,527 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 44 treesize of output 40 [2021-12-22 16:33:37,532 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 82 treesize of output 74 [2021-12-22 16:33:38,769 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1057233638] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:33:38,769 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:33:38,769 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 28 [2021-12-22 16:33:38,769 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994883298] [2021-12-22 16:33:38,769 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:33:38,770 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-12-22 16:33:38,770 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:33:38,770 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-12-22 16:33:38,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1057, Unknown=13, NotChecked=0, Total=1190 [2021-12-22 16:33:38,771 INFO L87 Difference]: Start difference. First operand 493 states and 667 transitions. Second operand has 29 states, 28 states have (on average 2.5357142857142856) internal successors, (71), 25 states have internal predecessors, (71), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-22 16:33:40,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:33:40,038 INFO L93 Difference]: Finished difference Result 658 states and 746 transitions. [2021-12-22 16:33:40,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-22 16:33:40,038 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.5357142857142856) internal successors, (71), 25 states have internal predecessors, (71), 4 states have call successors, (4), 4 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 39 [2021-12-22 16:33:40,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:33:40,043 INFO L225 Difference]: With dead ends: 658 [2021-12-22 16:33:40,043 INFO L226 Difference]: Without dead ends: 658 [2021-12-22 16:33:40,044 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 41 SyntacticMatches, 5 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=272, Invalid=1695, Unknown=13, NotChecked=0, Total=1980 [2021-12-22 16:33:40,045 INFO L933 BasicCegarLoop]: 197 mSDtfsCounter, 1109 mSDsluCounter, 2059 mSDsCounter, 0 mSdLazyCounter, 1790 mSolverCounterSat, 162 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1109 SdHoareTripleChecker+Valid, 2256 SdHoareTripleChecker+Invalid, 2534 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 162 IncrementalHoareTripleChecker+Valid, 1790 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 582 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-12-22 16:33:40,045 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1109 Valid, 2256 Invalid, 2534 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [162 Valid, 1790 Invalid, 0 Unknown, 582 Unchecked, 0.9s Time] [2021-12-22 16:33:40,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 658 states. [2021-12-22 16:33:40,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 658 to 491. [2021-12-22 16:33:40,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 491 states, 349 states have (on average 1.7220630372492836) internal successors, (601), 468 states have internal predecessors, (601), 20 states have call successors, (20), 6 states have call predecessors, (20), 7 states have return successors, (38), 18 states have call predecessors, (38), 20 states have call successors, (38) [2021-12-22 16:33:40,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 491 states to 491 states and 659 transitions. [2021-12-22 16:33:40,056 INFO L78 Accepts]: Start accepts. Automaton has 491 states and 659 transitions. Word has length 39 [2021-12-22 16:33:40,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:33:40,056 INFO L470 AbstractCegarLoop]: Abstraction has 491 states and 659 transitions. [2021-12-22 16:33:40,057 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 2.5357142857142856) internal successors, (71), 25 states have internal predecessors, (71), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-22 16:33:40,057 INFO L276 IsEmpty]: Start isEmpty. Operand 491 states and 659 transitions. [2021-12-22 16:33:40,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-22 16:33:40,057 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:33:40,057 INFO L514 BasicCegarLoop]: 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] [2021-12-22 16:33:40,088 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-22 16:33:40,271 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 16:33:40,271 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting appendErr23REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 143 more)] === [2021-12-22 16:33:40,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:33:40,272 INFO L85 PathProgramCache]: Analyzing trace with hash -1220540201, now seen corresponding path program 1 times [2021-12-22 16:33:40,272 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:33:40,272 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [697472807] [2021-12-22 16:33:40,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:33:40,272 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:33:40,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:40,363 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-22 16:33:40,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:40,525 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:33:40,525 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:33:40,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [697472807] [2021-12-22 16:33:40,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [697472807] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:33:40,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [61809699] [2021-12-22 16:33:40,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:33:40,526 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 16:33:40,526 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 16:33:40,527 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) [2021-12-22 16:33:40,529 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-22 16:33:40,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:40,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 49 conjunts are in the unsatisfiable core [2021-12-22 16:33:40,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:33:40,674 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 [2021-12-22 16:33:40,831 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-22 16:33:40,870 INFO L353 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2021-12-22 16:33:40,870 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 1 case distinctions, treesize of input 21 treesize of output 20 [2021-12-22 16:33:40,905 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-22 16:33:40,905 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 1 case distinctions, treesize of input 23 treesize of output 27 [2021-12-22 16:33:40,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:33:40,915 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 7 [2021-12-22 16:33:40,958 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-22 16:33:40,958 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 1 case distinctions, treesize of input 28 treesize of output 32 [2021-12-22 16:33:41,091 INFO L353 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-12-22 16:33:41,092 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 15 treesize of output 15 [2021-12-22 16:33:41,194 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-22 16:33:41,195 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 [2021-12-22 16:33:41,234 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 34 treesize of output 30 [2021-12-22 16:33:41,269 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:41,269 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 1 case distinctions, treesize of input 35 treesize of output 15 [2021-12-22 16:33:41,285 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:33:41,285 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:33:41,324 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1074 (Array Int Int))) (not (= (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_1074) c_append_~head.base) c_append_~head.offset) 0))) is different from false [2021-12-22 16:33:41,332 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_append_~node~0.base_37 Int) (v_ArrVal_1074 (Array Int Int))) (or (not (= (select |c_#valid| v_append_~node~0.base_37) 0)) (not (= (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_37 v_ArrVal_1074) |c_append_#in~head.base|) |c_append_#in~head.offset|) 0)))) is different from false [2021-12-22 16:33:41,343 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_append_~node~0.base_37 Int) (v_ArrVal_1074 (Array Int Int))) (or (not (= (select |c_#valid| v_append_~node~0.base_37) 0)) (not (= (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_37 v_ArrVal_1074) |c_ULTIMATE.start_main_~list~0#1.base|) |c_ULTIMATE.start_main_~list~0#1.offset|) 0)))) is different from false [2021-12-22 16:33:41,427 INFO L353 Elim1Store]: treesize reduction 21, result has 47.5 percent of original size [2021-12-22 16:33:41,427 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 33 [2021-12-22 16:33:41,429 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:33:41,432 INFO L353 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-12-22 16:33:41,432 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 72 treesize of output 34 [2021-12-22 16:33:41,435 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 20 treesize of output 18 [2021-12-22 16:33:41,440 INFO L353 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-22 16:33:41,440 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 12 [2021-12-22 16:33:41,617 INFO L353 Elim1Store]: treesize reduction 21, result has 47.5 percent of original size [2021-12-22 16:33:41,618 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 33 [2021-12-22 16:33:41,644 INFO L353 Elim1Store]: treesize reduction 10, result has 71.4 percent of original size [2021-12-22 16:33:41,645 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 141 treesize of output 147 [2021-12-22 16:33:41,649 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 114 treesize of output 110 [2021-12-22 16:33:41,652 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 110 treesize of output 102 [2021-12-22 16:33:41,977 INFO L353 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-22 16:33:41,978 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 13 treesize of output 12 [2021-12-22 16:33:42,095 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2021-12-22 16:33:42,096 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [61809699] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 16:33:42,096 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 16:33:42,096 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 15] total 37 [2021-12-22 16:33:42,096 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42920602] [2021-12-22 16:33:42,096 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 16:33:42,097 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-12-22 16:33:42,097 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:33:42,097 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-12-22 16:33:42,098 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=965, Unknown=6, NotChecked=198, Total=1332 [2021-12-22 16:33:42,098 INFO L87 Difference]: Start difference. First operand 491 states and 659 transitions. Second operand has 37 states, 37 states have (on average 2.2432432432432434) internal successors, (83), 31 states have internal predecessors, (83), 6 states have call successors, (6), 6 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-22 16:33:43,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:33:43,769 INFO L93 Difference]: Finished difference Result 616 states and 670 transitions. [2021-12-22 16:33:43,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-12-22 16:33:43,770 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.2432432432432434) internal successors, (83), 31 states have internal predecessors, (83), 6 states have call successors, (6), 6 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 39 [2021-12-22 16:33:43,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:33:43,773 INFO L225 Difference]: With dead ends: 616 [2021-12-22 16:33:43,773 INFO L226 Difference]: Without dead ends: 616 [2021-12-22 16:33:43,773 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 61 SyntacticMatches, 6 SemanticMatches, 50 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 673 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=408, Invalid=1945, Unknown=11, NotChecked=288, Total=2652 [2021-12-22 16:33:43,774 INFO L933 BasicCegarLoop]: 188 mSDtfsCounter, 628 mSDsluCounter, 2570 mSDsCounter, 0 mSdLazyCounter, 2492 mSolverCounterSat, 133 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 628 SdHoareTripleChecker+Valid, 2758 SdHoareTripleChecker+Invalid, 4034 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 133 IncrementalHoareTripleChecker+Valid, 2492 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1409 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-12-22 16:33:43,774 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [628 Valid, 2758 Invalid, 4034 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [133 Valid, 2492 Invalid, 0 Unknown, 1409 Unchecked, 1.1s Time] [2021-12-22 16:33:43,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 616 states. [2021-12-22 16:33:43,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 616 to 464. [2021-12-22 16:33:43,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 464 states, 323 states have (on average 1.743034055727554) internal successors, (563), 441 states have internal predecessors, (563), 20 states have call successors, (20), 6 states have call predecessors, (20), 6 states have return successors, (20), 18 states have call predecessors, (20), 20 states have call successors, (20) [2021-12-22 16:33:43,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 603 transitions. [2021-12-22 16:33:43,784 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 603 transitions. Word has length 39 [2021-12-22 16:33:43,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:33:43,784 INFO L470 AbstractCegarLoop]: Abstraction has 464 states and 603 transitions. [2021-12-22 16:33:43,784 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.2432432432432434) internal successors, (83), 31 states have internal predecessors, (83), 6 states have call successors, (6), 6 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-22 16:33:43,784 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 603 transitions. [2021-12-22 16:33:43,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-12-22 16:33:43,785 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:33:43,785 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1] [2021-12-22 16:33:43,813 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-22 16:33:43,999 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-12-22 16:33:44,000 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting appendErr23REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 143 more)] === [2021-12-22 16:33:44,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:33:44,000 INFO L85 PathProgramCache]: Analyzing trace with hash 1913380289, now seen corresponding path program 1 times [2021-12-22 16:33:44,000 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:33:44,000 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1316114545] [2021-12-22 16:33:44,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:33:44,000 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:33:44,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:44,203 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-22 16:33:44,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:44,218 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-12-22 16:33:44,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:44,295 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 13 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 16:33:44,296 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:33:44,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1316114545] [2021-12-22 16:33:44,296 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1316114545] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:33:44,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [843402410] [2021-12-22 16:33:44,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:33:44,297 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 16:33:44,297 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 16:33:44,298 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) [2021-12-22 16:33:44,328 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-22 16:33:44,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:44,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 469 conjuncts, 53 conjunts are in the unsatisfiable core [2021-12-22 16:33:44,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:33:44,521 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 [2021-12-22 16:33:44,759 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-22 16:33:44,763 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-22 16:33:44,902 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:33:44,903 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 26 treesize of output 28 [2021-12-22 16:33:44,916 INFO L353 Elim1Store]: treesize reduction 22, result has 40.5 percent of original size [2021-12-22 16:33:44,916 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 22 treesize of output 24 [2021-12-22 16:33:44,958 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 36 [2021-12-22 16:33:44,964 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 35 treesize of output 35 [2021-12-22 16:33:45,061 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 36 [2021-12-22 16:33:45,065 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 35 treesize of output 35 [2021-12-22 16:33:45,102 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 36 [2021-12-22 16:33:45,114 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 35 treesize of output 35 [2021-12-22 16:33:45,164 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:33:45,166 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 17 [2021-12-22 16:33:45,169 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:33:45,171 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:45,171 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 17 [2021-12-22 16:33:45,194 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 14 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 16:33:45,194 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:33:45,256 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_1353 (Array Int Int))) (<= 0 (+ 5 (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_1353) c_append_~head.base) (+ c_append_~head.offset 4))))) (forall ((v_ArrVal_1354 (Array Int Int)) (v_ArrVal_1353 (Array Int Int))) (let ((.cse0 (+ c_append_~head.offset 4))) (<= (+ 9 (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_1353) c_append_~head.base) .cse0)) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_1354) c_append_~head.base) .cse0)))))) is different from false [2021-12-22 16:33:45,546 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:45,547 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 73 treesize of output 74 [2021-12-22 16:33:45,554 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:45,554 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 74 treesize of output 64 [2021-12-22 16:33:45,557 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:33:45,565 INFO L353 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2021-12-22 16:33:45,565 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 61 treesize of output 52 [2021-12-22 16:33:45,569 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:33:45,575 INFO L353 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-12-22 16:33:45,575 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 46 treesize of output 28 [2021-12-22 16:33:45,585 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:45,586 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 48 treesize of output 52 [2021-12-22 16:33:45,593 INFO L353 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-22 16:33:45,594 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 25 treesize of output 24 [2021-12-22 16:33:45,865 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:45,866 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 73 treesize of output 74 [2021-12-22 16:33:45,872 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:45,873 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 74 treesize of output 64 [2021-12-22 16:33:45,883 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:45,883 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 94 treesize of output 97 [2021-12-22 16:33:45,896 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:45,898 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 159 treesize of output 150 [2021-12-22 16:33:45,905 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 111 treesize of output 103 [2021-12-22 16:33:45,909 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 103 treesize of output 95 [2021-12-22 16:33:45,914 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 95 treesize of output 91 [2021-12-22 16:33:46,354 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 73 treesize of output 69 [2021-12-22 16:33:46,940 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 14 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 9 not checked. [2021-12-22 16:33:46,941 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [843402410] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 16:33:46,941 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 16:33:46,941 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 30 [2021-12-22 16:33:46,943 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584942138] [2021-12-22 16:33:46,943 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 16:33:46,944 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-12-22 16:33:46,944 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:33:46,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-12-22 16:33:46,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=776, Unknown=4, NotChecked=56, Total=930 [2021-12-22 16:33:46,945 INFO L87 Difference]: Start difference. First operand 464 states and 603 transitions. Second operand has 31 states, 27 states have (on average 4.148148148148148) internal successors, (112), 24 states have internal predecessors, (112), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-22 16:33:47,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:33:47,990 INFO L93 Difference]: Finished difference Result 496 states and 633 transitions. [2021-12-22 16:33:47,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-12-22 16:33:47,990 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 27 states have (on average 4.148148148148148) internal successors, (112), 24 states have internal predecessors, (112), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 2 states have call successors, (5) Word has length 54 [2021-12-22 16:33:47,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:33:47,992 INFO L225 Difference]: With dead ends: 496 [2021-12-22 16:33:47,992 INFO L226 Difference]: Without dead ends: 496 [2021-12-22 16:33:47,993 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 97 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 362 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=257, Invalid=1723, Unknown=4, NotChecked=86, Total=2070 [2021-12-22 16:33:47,993 INFO L933 BasicCegarLoop]: 299 mSDtfsCounter, 96 mSDsluCounter, 2311 mSDsCounter, 0 mSdLazyCounter, 1082 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 2610 SdHoareTripleChecker+Invalid, 2042 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 1082 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 934 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-22 16:33:47,994 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 2610 Invalid, 2042 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 1082 Invalid, 0 Unknown, 934 Unchecked, 0.5s Time] [2021-12-22 16:33:47,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 496 states. [2021-12-22 16:33:48,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 496 to 462. [2021-12-22 16:33:48,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 462 states, 323 states have (on average 1.743034055727554) internal successors, (563), 440 states have internal predecessors, (563), 18 states have call successors, (18), 6 states have call predecessors, (18), 6 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-12-22 16:33:48,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 462 states to 462 states and 599 transitions. [2021-12-22 16:33:48,002 INFO L78 Accepts]: Start accepts. Automaton has 462 states and 599 transitions. Word has length 54 [2021-12-22 16:33:48,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:33:48,002 INFO L470 AbstractCegarLoop]: Abstraction has 462 states and 599 transitions. [2021-12-22 16:33:48,003 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 27 states have (on average 4.148148148148148) internal successors, (112), 24 states have internal predecessors, (112), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-22 16:33:48,003 INFO L276 IsEmpty]: Start isEmpty. Operand 462 states and 599 transitions. [2021-12-22 16:33:48,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-12-22 16:33:48,003 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:33:48,004 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-12-22 16:33:48,033 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-22 16:33:48,227 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 16:33:48,228 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting appendErr23REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 143 more)] === [2021-12-22 16:33:48,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:33:48,228 INFO L85 PathProgramCache]: Analyzing trace with hash -1392743212, now seen corresponding path program 1 times [2021-12-22 16:33:48,228 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:33:48,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [62198671] [2021-12-22 16:33:48,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:33:48,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:33:48,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:48,469 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-22 16:33:48,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:48,482 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-12-22 16:33:48,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:48,493 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-12-22 16:33:48,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:48,597 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 38 proven. 14 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-22 16:33:48,597 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:33:48,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [62198671] [2021-12-22 16:33:48,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [62198671] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:33:48,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [872129706] [2021-12-22 16:33:48,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:33:48,598 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 16:33:48,598 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 16:33:48,599 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) [2021-12-22 16:33:48,630 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-22 16:33:48,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:48,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 614 conjuncts, 55 conjunts are in the unsatisfiable core [2021-12-22 16:33:48,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:33:48,897 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 [2021-12-22 16:33:49,076 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-22 16:33:49,080 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-22 16:33:49,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:33:49,207 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 26 treesize of output 28 [2021-12-22 16:33:49,219 INFO L353 Elim1Store]: treesize reduction 22, result has 40.5 percent of original size [2021-12-22 16:33:49,219 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 22 treesize of output 24 [2021-12-22 16:33:49,257 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 36 [2021-12-22 16:33:49,260 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 35 treesize of output 35 [2021-12-22 16:33:49,380 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 36 [2021-12-22 16:33:49,384 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 35 treesize of output 35 [2021-12-22 16:33:49,421 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 36 [2021-12-22 16:33:49,425 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 35 treesize of output 35 [2021-12-22 16:33:49,459 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:33:49,463 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 17 [2021-12-22 16:33:49,465 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:33:49,467 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:49,467 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 17 [2021-12-22 16:33:49,484 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 41 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-22 16:33:49,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:33:49,537 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_1728 (Array Int Int))) (<= 0 (+ (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_1728) c_append_~head.base) (+ c_append_~head.offset 4)) 5))) (forall ((v_ArrVal_1728 (Array Int Int)) (v_ArrVal_1727 (Array Int Int))) (let ((.cse0 (+ c_append_~head.offset 4))) (<= (+ (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_1728) c_append_~head.base) .cse0) 9) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_1727) c_append_~head.base) .cse0)))))) is different from false [2021-12-22 16:33:50,036 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:50,036 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 73 treesize of output 74 [2021-12-22 16:33:50,043 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:50,043 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 74 treesize of output 64 [2021-12-22 16:33:50,046 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:33:50,052 INFO L353 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2021-12-22 16:33:50,052 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 61 treesize of output 52 [2021-12-22 16:33:50,055 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:33:50,060 INFO L353 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-12-22 16:33:50,060 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 46 treesize of output 28 [2021-12-22 16:33:50,068 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:50,068 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 48 treesize of output 52 [2021-12-22 16:33:50,074 INFO L353 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-22 16:33:50,074 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 25 treesize of output 24 [2021-12-22 16:33:50,339 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:50,339 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 73 treesize of output 74 [2021-12-22 16:33:50,345 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:50,345 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 74 treesize of output 64 [2021-12-22 16:33:50,352 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:50,353 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 94 treesize of output 97 [2021-12-22 16:33:50,363 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:50,364 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 159 treesize of output 150 [2021-12-22 16:33:50,369 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 111 treesize of output 103 [2021-12-22 16:33:50,373 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 103 treesize of output 95 [2021-12-22 16:33:50,376 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 95 treesize of output 91 [2021-12-22 16:33:50,845 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 73 treesize of output 69 [2021-12-22 16:33:51,529 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 41 proven. 4 refuted. 0 times theorem prover too weak. 10 trivial. 7 not checked. [2021-12-22 16:33:51,529 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [872129706] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 16:33:51,529 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 16:33:51,529 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 33 [2021-12-22 16:33:51,529 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265826995] [2021-12-22 16:33:51,530 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 16:33:51,530 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-12-22 16:33:51,530 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:33:51,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-12-22 16:33:51,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=938, Unknown=1, NotChecked=62, Total=1122 [2021-12-22 16:33:51,531 INFO L87 Difference]: Start difference. First operand 462 states and 599 transitions. Second operand has 34 states, 30 states have (on average 4.066666666666666) internal successors, (122), 27 states have internal predecessors, (122), 5 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (7), 5 states have call predecessors, (7), 2 states have call successors, (7) [2021-12-22 16:33:53,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:33:53,064 INFO L93 Difference]: Finished difference Result 617 states and 669 transitions. [2021-12-22 16:33:53,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-22 16:33:53,064 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 30 states have (on average 4.066666666666666) internal successors, (122), 27 states have internal predecessors, (122), 5 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (7), 5 states have call predecessors, (7), 2 states have call successors, (7) Word has length 71 [2021-12-22 16:33:53,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:33:53,066 INFO L225 Difference]: With dead ends: 617 [2021-12-22 16:33:53,067 INFO L226 Difference]: Without dead ends: 617 [2021-12-22 16:33:53,067 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 128 SyntacticMatches, 3 SemanticMatches, 42 ConstructedPredicates, 1 IntricatePredicates, 1 DeprecatedPredicates, 437 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=288, Invalid=1521, Unknown=1, NotChecked=82, Total=1892 [2021-12-22 16:33:53,068 INFO L933 BasicCegarLoop]: 149 mSDtfsCounter, 587 mSDsluCounter, 2397 mSDsCounter, 0 mSdLazyCounter, 2506 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 587 SdHoareTripleChecker+Valid, 2546 SdHoareTripleChecker+Invalid, 3976 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 2506 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1403 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-12-22 16:33:53,068 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [587 Valid, 2546 Invalid, 3976 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 2506 Invalid, 0 Unknown, 1403 Unchecked, 1.1s Time] [2021-12-22 16:33:53,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 617 states. [2021-12-22 16:33:53,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 617 to 478. [2021-12-22 16:33:53,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 338 states have (on average 1.7100591715976332) internal successors, (578), 455 states have internal predecessors, (578), 18 states have call successors, (18), 7 states have call predecessors, (18), 7 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-12-22 16:33:53,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 614 transitions. [2021-12-22 16:33:53,078 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 614 transitions. Word has length 71 [2021-12-22 16:33:53,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:33:53,078 INFO L470 AbstractCegarLoop]: Abstraction has 478 states and 614 transitions. [2021-12-22 16:33:53,079 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 30 states have (on average 4.066666666666666) internal successors, (122), 27 states have internal predecessors, (122), 5 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (7), 5 states have call predecessors, (7), 2 states have call successors, (7) [2021-12-22 16:33:53,079 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 614 transitions. [2021-12-22 16:33:53,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-12-22 16:33:53,079 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:33:53,080 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:33:53,103 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-12-22 16:33:53,295 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 16:33:53,295 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting appendErr23REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 143 more)] === [2021-12-22 16:33:53,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:33:53,296 INFO L85 PathProgramCache]: Analyzing trace with hash 358204681, now seen corresponding path program 1 times [2021-12-22 16:33:53,296 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:33:53,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1248360469] [2021-12-22 16:33:53,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:33:53,296 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:33:53,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:53,540 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-22 16:33:53,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:53,553 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-12-22 16:33:53,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:53,565 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2021-12-22 16:33:53,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:53,640 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 51 proven. 14 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-12-22 16:33:53,640 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:33:53,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1248360469] [2021-12-22 16:33:53,641 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1248360469] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:33:53,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [222415262] [2021-12-22 16:33:53,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:33:53,641 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 16:33:53,642 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 16:33:53,642 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) [2021-12-22 16:33:53,645 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-22 16:33:53,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:53,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 637 conjuncts, 55 conjunts are in the unsatisfiable core [2021-12-22 16:33:53,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:33:53,923 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 [2021-12-22 16:33:54,092 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-22 16:33:54,094 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-22 16:33:54,241 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:33:54,241 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 26 treesize of output 28 [2021-12-22 16:33:54,252 INFO L353 Elim1Store]: treesize reduction 22, result has 40.5 percent of original size [2021-12-22 16:33:54,252 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 22 treesize of output 24 [2021-12-22 16:33:54,291 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 36 [2021-12-22 16:33:54,294 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 35 treesize of output 35 [2021-12-22 16:33:54,445 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 36 [2021-12-22 16:33:54,449 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 35 treesize of output 35 [2021-12-22 16:33:54,495 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 36 [2021-12-22 16:33:54,499 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 35 treesize of output 35 [2021-12-22 16:33:54,544 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:33:54,545 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 17 [2021-12-22 16:33:54,547 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:33:54,549 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:54,549 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 17 [2021-12-22 16:33:54,573 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 54 proven. 11 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-12-22 16:33:54,573 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:33:54,636 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_2103 (Array Int Int)) (v_ArrVal_2102 (Array Int Int))) (let ((.cse0 (+ c_append_~head.offset 4))) (<= (+ 9 (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_2102) c_append_~head.base) .cse0)) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_2103) c_append_~head.base) .cse0))))) (forall ((v_ArrVal_2102 (Array Int Int))) (<= 0 (+ 5 (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_2102) c_append_~head.base) (+ c_append_~head.offset 4)))))) is different from false [2021-12-22 16:33:55,428 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:55,428 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 73 treesize of output 74 [2021-12-22 16:33:55,433 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:55,433 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 74 treesize of output 64 [2021-12-22 16:33:55,435 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:33:55,442 INFO L353 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2021-12-22 16:33:55,442 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 61 treesize of output 52 [2021-12-22 16:33:55,444 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:33:55,448 INFO L353 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-12-22 16:33:55,449 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 46 treesize of output 28 [2021-12-22 16:33:55,455 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:55,455 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 48 treesize of output 52 [2021-12-22 16:33:55,464 INFO L353 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-22 16:33:55,465 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 25 treesize of output 24 [2021-12-22 16:33:55,765 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:55,765 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 73 treesize of output 74 [2021-12-22 16:33:55,771 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:55,772 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 74 treesize of output 64 [2021-12-22 16:33:55,782 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:55,782 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 94 treesize of output 97 [2021-12-22 16:33:55,792 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:33:55,793 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 159 treesize of output 150 [2021-12-22 16:33:55,800 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 111 treesize of output 103 [2021-12-22 16:33:55,804 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 103 treesize of output 95 [2021-12-22 16:33:55,809 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 95 treesize of output 91 [2021-12-22 16:33:56,357 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 73 treesize of output 69 [2021-12-22 16:33:57,080 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 41 proven. 17 refuted. 0 times theorem prover too weak. 21 trivial. 7 not checked. [2021-12-22 16:33:57,081 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [222415262] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 16:33:57,081 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 16:33:57,081 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 12] total 32 [2021-12-22 16:33:57,081 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286990050] [2021-12-22 16:33:57,081 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 16:33:57,082 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-12-22 16:33:57,082 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:33:57,082 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-12-22 16:33:57,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=894, Unknown=1, NotChecked=60, Total=1056 [2021-12-22 16:33:57,083 INFO L87 Difference]: Start difference. First operand 478 states and 614 transitions. Second operand has 33 states, 32 states have (on average 4.1875) internal successors, (134), 29 states have internal predecessors, (134), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-22 16:33:58,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:33:58,364 INFO L93 Difference]: Finished difference Result 511 states and 646 transitions. [2021-12-22 16:33:58,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-12-22 16:33:58,365 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 4.1875) internal successors, (134), 29 states have internal predecessors, (134), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 2 states have call successors, (5) Word has length 81 [2021-12-22 16:33:58,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:33:58,367 INFO L225 Difference]: With dead ends: 511 [2021-12-22 16:33:58,367 INFO L226 Difference]: Without dead ends: 511 [2021-12-22 16:33:58,368 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 145 SyntacticMatches, 7 SemanticMatches, 44 ConstructedPredicates, 1 IntricatePredicates, 1 DeprecatedPredicates, 413 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=316, Invalid=1667, Unknown=1, NotChecked=86, Total=2070 [2021-12-22 16:33:58,368 INFO L933 BasicCegarLoop]: 308 mSDtfsCounter, 122 mSDsluCounter, 2616 mSDsCounter, 0 mSdLazyCounter, 1213 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 2924 SdHoareTripleChecker+Invalid, 2473 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 1213 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1222 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-22 16:33:58,369 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [122 Valid, 2924 Invalid, 2473 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 1213 Invalid, 0 Unknown, 1222 Unchecked, 0.6s Time] [2021-12-22 16:33:58,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 511 states. [2021-12-22 16:33:58,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 511 to 452. [2021-12-22 16:33:58,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 452 states, 315 states have (on average 1.7492063492063492) internal successors, (551), 432 states have internal predecessors, (551), 16 states have call successors, (16), 6 states have call predecessors, (16), 6 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2021-12-22 16:33:58,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 583 transitions. [2021-12-22 16:33:58,376 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 583 transitions. Word has length 81 [2021-12-22 16:33:58,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:33:58,377 INFO L470 AbstractCegarLoop]: Abstraction has 452 states and 583 transitions. [2021-12-22 16:33:58,377 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 4.1875) internal successors, (134), 29 states have internal predecessors, (134), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-22 16:33:58,377 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 583 transitions. [2021-12-22 16:33:58,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-12-22 16:33:58,378 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:33:58,378 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 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] [2021-12-22 16:33:58,402 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-12-22 16:33:58,602 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-12-22 16:33:58,602 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting appendErr23REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 143 more)] === [2021-12-22 16:33:58,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:33:58,602 INFO L85 PathProgramCache]: Analyzing trace with hash 1693525601, now seen corresponding path program 1 times [2021-12-22 16:33:58,603 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:33:58,603 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [35858317] [2021-12-22 16:33:58,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:33:58,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:33:58,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:58,904 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-22 16:33:58,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:58,916 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-12-22 16:33:58,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:58,932 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-12-22 16:33:58,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:58,943 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2021-12-22 16:33:58,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:59,057 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 64 proven. 15 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-12-22 16:33:59,057 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:33:59,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [35858317] [2021-12-22 16:33:59,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [35858317] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:33:59,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1355089030] [2021-12-22 16:33:59,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:33:59,057 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 16:33:59,058 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 16:33:59,062 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 16:33:59,062 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-22 16:33:59,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:33:59,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 759 conjuncts, 53 conjunts are in the unsatisfiable core [2021-12-22 16:33:59,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:33:59,405 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 [2021-12-22 16:33:59,578 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-22 16:33:59,581 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-22 16:33:59,692 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:33:59,693 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 26 treesize of output 28 [2021-12-22 16:33:59,706 INFO L353 Elim1Store]: treesize reduction 22, result has 40.5 percent of original size [2021-12-22 16:33:59,707 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 22 treesize of output 24 [2021-12-22 16:33:59,754 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 36 [2021-12-22 16:33:59,757 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 35 treesize of output 35 [2021-12-22 16:33:59,916 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 36 [2021-12-22 16:33:59,919 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 35 treesize of output 35 [2021-12-22 16:33:59,956 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 36 [2021-12-22 16:33:59,960 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 35 treesize of output 35 [2021-12-22 16:34:00,006 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:34:00,006 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 17 [2021-12-22 16:34:00,014 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:34:00,016 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:34:00,016 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 17 [2021-12-22 16:34:00,037 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 68 proven. 11 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-12-22 16:34:00,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:34:00,090 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_2573 (Array Int Int)) (v_ArrVal_2572 (Array Int Int))) (let ((.cse0 (+ c_append_~head.offset 4))) (<= (+ 9 (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_2573) c_append_~head.base) .cse0)) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_2572) c_append_~head.base) .cse0))))) (forall ((v_ArrVal_2573 (Array Int Int))) (<= 0 (+ 5 (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_2573) c_append_~head.base) (+ c_append_~head.offset 4)))))) is different from false [2021-12-22 16:34:00,510 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:34:00,511 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 73 treesize of output 74 [2021-12-22 16:34:00,516 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:34:00,517 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 74 treesize of output 64 [2021-12-22 16:34:00,521 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:34:00,529 INFO L353 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2021-12-22 16:34:00,530 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 61 treesize of output 52 [2021-12-22 16:34:00,533 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:34:00,539 INFO L353 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-12-22 16:34:00,539 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 46 treesize of output 28 [2021-12-22 16:34:00,548 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:34:00,549 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 48 treesize of output 52 [2021-12-22 16:34:00,556 INFO L353 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-22 16:34:00,556 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 25 treesize of output 24 [2021-12-22 16:34:00,796 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:34:00,796 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 73 treesize of output 74 [2021-12-22 16:34:00,800 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:34:00,801 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 74 treesize of output 64 [2021-12-22 16:34:00,810 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:34:00,810 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 94 treesize of output 97 [2021-12-22 16:34:00,817 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:34:00,817 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 159 treesize of output 150 [2021-12-22 16:34:00,823 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 111 treesize of output 103 [2021-12-22 16:34:00,827 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 103 treesize of output 95 [2021-12-22 16:34:00,830 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 95 treesize of output 91 [2021-12-22 16:34:01,264 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 73 treesize of output 69 [2021-12-22 16:34:01,941 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 68 proven. 4 refuted. 0 times theorem prover too weak. 35 trivial. 7 not checked. [2021-12-22 16:34:01,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1355089030] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 16:34:01,942 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 16:34:01,942 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 33 [2021-12-22 16:34:01,942 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327627063] [2021-12-22 16:34:01,942 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 16:34:01,943 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-12-22 16:34:01,943 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:34:01,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-12-22 16:34:01,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=942, Unknown=1, NotChecked=62, Total=1122 [2021-12-22 16:34:01,944 INFO L87 Difference]: Start difference. First operand 452 states and 583 transitions. Second operand has 34 states, 30 states have (on average 4.066666666666666) internal successors, (122), 27 states have internal predecessors, (122), 5 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 5 states have call predecessors, (9), 2 states have call successors, (9) [2021-12-22 16:34:02,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:34:02,741 INFO L93 Difference]: Finished difference Result 465 states and 596 transitions. [2021-12-22 16:34:02,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-22 16:34:02,742 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 30 states have (on average 4.066666666666666) internal successors, (122), 27 states have internal predecessors, (122), 5 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 5 states have call predecessors, (9), 2 states have call successors, (9) Word has length 88 [2021-12-22 16:34:02,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:34:02,744 INFO L225 Difference]: With dead ends: 465 [2021-12-22 16:34:02,744 INFO L226 Difference]: Without dead ends: 465 [2021-12-22 16:34:02,744 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 167 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=242, Invalid=1483, Unknown=1, NotChecked=80, Total=1806 [2021-12-22 16:34:02,745 INFO L933 BasicCegarLoop]: 297 mSDtfsCounter, 338 mSDsluCounter, 2078 mSDsCounter, 0 mSdLazyCounter, 878 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 349 SdHoareTripleChecker+Valid, 2375 SdHoareTripleChecker+Invalid, 2093 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 878 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1199 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-22 16:34:02,745 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [349 Valid, 2375 Invalid, 2093 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 878 Invalid, 0 Unknown, 1199 Unchecked, 0.5s Time] [2021-12-22 16:34:02,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2021-12-22 16:34:02,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 464. [2021-12-22 16:34:02,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 464 states, 327 states have (on average 1.7217125382262997) internal successors, (563), 443 states have internal predecessors, (563), 16 states have call successors, (16), 7 states have call predecessors, (16), 6 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2021-12-22 16:34:02,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 595 transitions. [2021-12-22 16:34:02,753 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 595 transitions. Word has length 88 [2021-12-22 16:34:02,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:34:02,753 INFO L470 AbstractCegarLoop]: Abstraction has 464 states and 595 transitions. [2021-12-22 16:34:02,753 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 30 states have (on average 4.066666666666666) internal successors, (122), 27 states have internal predecessors, (122), 5 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 5 states have call predecessors, (9), 2 states have call successors, (9) [2021-12-22 16:34:02,753 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 595 transitions. [2021-12-22 16:34:02,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-12-22 16:34:02,754 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:34:02,754 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 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, 1] [2021-12-22 16:34:02,781 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-12-22 16:34:02,968 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-12-22 16:34:02,968 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting appendErr23REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 143 more)] === [2021-12-22 16:34:02,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:34:02,968 INFO L85 PathProgramCache]: Analyzing trace with hash 1694546100, now seen corresponding path program 1 times [2021-12-22 16:34:02,969 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:34:02,969 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [573437022] [2021-12-22 16:34:02,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:34:02,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:34:03,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:34:03,225 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-22 16:34:03,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:34:03,236 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-12-22 16:34:03,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:34:03,249 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-12-22 16:34:03,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:34:03,260 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2021-12-22 16:34:03,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:34:03,272 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 75 [2021-12-22 16:34:03,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:34:03,374 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 90 proven. 16 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2021-12-22 16:34:03,374 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:34:03,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [573437022] [2021-12-22 16:34:03,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [573437022] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:34:03,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [509591644] [2021-12-22 16:34:03,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:34:03,376 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 16:34:03,376 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 16:34:03,377 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 16:34:03,403 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-22 16:34:03,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:34:03,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 904 conjuncts, 53 conjunts are in the unsatisfiable core [2021-12-22 16:34:03,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:34:03,801 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 [2021-12-22 16:34:03,970 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-22 16:34:03,972 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-22 16:34:04,079 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:34:04,080 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 26 treesize of output 28 [2021-12-22 16:34:04,090 INFO L353 Elim1Store]: treesize reduction 22, result has 40.5 percent of original size [2021-12-22 16:34:04,091 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 22 treesize of output 24 [2021-12-22 16:34:04,126 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 36 [2021-12-22 16:34:04,128 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 35 treesize of output 35 [2021-12-22 16:34:04,241 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 36 [2021-12-22 16:34:04,244 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 35 treesize of output 35 [2021-12-22 16:34:04,276 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 36 [2021-12-22 16:34:04,281 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 35 treesize of output 35 [2021-12-22 16:34:04,315 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:34:04,315 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 17 [2021-12-22 16:34:04,319 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:34:04,320 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:34:04,321 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 17 [2021-12-22 16:34:04,338 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 95 proven. 11 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2021-12-22 16:34:04,338 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:34:04,390 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_3137 (Array Int Int)) (v_ArrVal_3138 (Array Int Int))) (let ((.cse0 (+ c_append_~head.offset 4))) (<= (+ 9 (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_3138) c_append_~head.base) .cse0)) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_3137) c_append_~head.base) .cse0))))) (forall ((v_ArrVal_3138 (Array Int Int))) (<= 0 (+ 5 (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_3138) c_append_~head.base) (+ c_append_~head.offset 4)))))) is different from false [2021-12-22 16:34:04,829 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:34:04,830 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 73 treesize of output 74 [2021-12-22 16:34:04,835 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:34:04,835 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 74 treesize of output 64 [2021-12-22 16:34:04,838 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:34:04,847 INFO L353 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2021-12-22 16:34:04,848 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 61 treesize of output 52 [2021-12-22 16:34:04,851 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:34:04,855 INFO L353 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-12-22 16:34:04,855 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 46 treesize of output 28 [2021-12-22 16:34:04,863 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:34:04,863 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 48 treesize of output 52 [2021-12-22 16:34:04,869 INFO L353 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-22 16:34:04,869 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 25 treesize of output 24 [2021-12-22 16:34:05,095 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:34:05,095 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 73 treesize of output 74 [2021-12-22 16:34:05,100 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:34:05,100 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 74 treesize of output 64 [2021-12-22 16:34:05,106 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:34:05,107 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 94 treesize of output 97 [2021-12-22 16:34:05,114 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:34:05,114 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 159 treesize of output 150 [2021-12-22 16:34:05,119 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 111 treesize of output 103 [2021-12-22 16:34:05,124 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 103 treesize of output 95 [2021-12-22 16:34:05,128 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 95 treesize of output 91 [2021-12-22 16:34:05,575 INFO L387 Elim1Store]: Elim1 did not use preprocessing 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 73 treesize of output 69 [2021-12-22 16:34:06,258 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 95 proven. 4 refuted. 0 times theorem prover too weak. 76 trivial. 7 not checked. [2021-12-22 16:34:06,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [509591644] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 16:34:06,258 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 16:34:06,258 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 33 [2021-12-22 16:34:06,258 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822294263] [2021-12-22 16:34:06,259 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 16:34:06,259 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-12-22 16:34:06,259 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:34:06,259 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-12-22 16:34:06,260 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=937, Unknown=2, NotChecked=62, Total=1122 [2021-12-22 16:34:06,260 INFO L87 Difference]: Start difference. First operand 464 states and 595 transitions. Second operand has 34 states, 30 states have (on average 4.066666666666666) internal successors, (122), 27 states have internal predecessors, (122), 5 states have call successors, (13), 5 states have call predecessors, (13), 4 states have return successors, (11), 5 states have call predecessors, (11), 2 states have call successors, (11)