./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/loops-crafted-1/in-de61.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version c3fed411 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/AutomizerReach.xml -i ../sv-benchmarks/c/loops-crafted-1/in-de61.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-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 ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 49b7efdcf8f4d6c873493bd370328870547a88b20d287c5de5342268b0966917 --- Real Ultimate output --- This is Ultimate 0.2.2-tmp.no-commuhash-c3fed41 [2021-12-17 10:29:02,859 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-17 10:29:02,861 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-17 10:29:02,892 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-17 10:29:02,892 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-17 10:29:02,895 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-17 10:29:02,897 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-17 10:29:02,899 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-17 10:29:02,900 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-17 10:29:02,902 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-17 10:29:02,902 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-17 10:29:02,903 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-17 10:29:02,904 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-17 10:29:02,907 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-17 10:29:02,909 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-17 10:29:02,909 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-17 10:29:02,911 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-17 10:29:02,912 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-17 10:29:02,912 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-17 10:29:02,917 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-17 10:29:02,919 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-17 10:29:02,919 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-17 10:29:02,920 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-17 10:29:02,921 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-17 10:29:02,922 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-17 10:29:02,923 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-17 10:29:02,923 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-17 10:29:02,924 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-17 10:29:02,924 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-17 10:29:02,925 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-17 10:29:02,925 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-17 10:29:02,925 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-17 10:29:02,926 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-17 10:29:02,926 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-17 10:29:02,927 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-17 10:29:02,927 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-17 10:29:02,927 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-17 10:29:02,927 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-17 10:29:02,928 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-17 10:29:02,928 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-17 10:29:02,929 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-17 10:29:02,929 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-17 10:29:02,946 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-17 10:29:02,949 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-17 10:29:02,950 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-17 10:29:02,950 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-17 10:29:02,950 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-17 10:29:02,951 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-17 10:29:02,951 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-17 10:29:02,951 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-17 10:29:02,952 INFO L138 SettingsManager]: * Use SBE=true [2021-12-17 10:29:02,952 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-17 10:29:02,952 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-17 10:29:02,953 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-17 10:29:02,953 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-17 10:29:02,953 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-17 10:29:02,953 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-17 10:29:02,953 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-17 10:29:02,953 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-17 10:29:02,954 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-17 10:29:02,954 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-17 10:29:02,954 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-17 10:29:02,954 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-17 10:29:02,954 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-17 10:29:02,954 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-17 10:29:02,954 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-17 10:29:02,955 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-17 10:29:02,955 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-17 10:29:02,955 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-17 10:29:02,955 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-17 10:29:02,955 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-17 10:29:02,955 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-17 10:29:02,956 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-17 10:29:02,956 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-17 10:29:02,956 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-17 10:29:02,956 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-17 10:29:02,956 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 49b7efdcf8f4d6c873493bd370328870547a88b20d287c5de5342268b0966917 [2021-12-17 10:29:03,107 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-17 10:29:03,122 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-17 10:29:03,125 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-17 10:29:03,125 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-17 10:29:03,126 INFO L275 PluginConnector]: CDTParser initialized [2021-12-17 10:29:03,127 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops-crafted-1/in-de61.c [2021-12-17 10:29:03,174 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/174621258/936818f84f124bf296f2d73c5c94d711/FLAG9b53e404e [2021-12-17 10:29:03,530 INFO L306 CDTParser]: Found 1 translation units. [2021-12-17 10:29:03,531 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/in-de61.c [2021-12-17 10:29:03,537 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/174621258/936818f84f124bf296f2d73c5c94d711/FLAG9b53e404e [2021-12-17 10:29:03,549 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/174621258/936818f84f124bf296f2d73c5c94d711 [2021-12-17 10:29:03,550 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-17 10:29:03,552 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-17 10:29:03,554 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-17 10:29:03,554 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-17 10:29:03,556 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-17 10:29:03,556 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.12 10:29:03" (1/1) ... [2021-12-17 10:29:03,557 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@489b81 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 10:29:03, skipping insertion in model container [2021-12-17 10:29:03,557 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.12 10:29:03" (1/1) ... [2021-12-17 10:29:03,561 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-17 10:29:03,572 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-17 10:29:03,685 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/in-de61.c[368,381] [2021-12-17 10:29:03,695 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-17 10:29:03,699 INFO L203 MainTranslator]: Completed pre-run [2021-12-17 10:29:03,706 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/in-de61.c[368,381] [2021-12-17 10:29:03,710 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-17 10:29:03,718 INFO L208 MainTranslator]: Completed translation [2021-12-17 10:29:03,718 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 10:29:03 WrapperNode [2021-12-17 10:29:03,718 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-17 10:29:03,719 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-17 10:29:03,719 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-17 10:29:03,719 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-17 10:29:03,723 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 10:29:03" (1/1) ... [2021-12-17 10:29:03,729 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 10:29:03" (1/1) ... [2021-12-17 10:29:03,739 INFO L137 Inliner]: procedures = 13, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 85 [2021-12-17 10:29:03,739 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-17 10:29:03,740 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-17 10:29:03,740 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-17 10:29:03,740 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-17 10:29:03,744 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 10:29:03" (1/1) ... [2021-12-17 10:29:03,744 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 10:29:03" (1/1) ... [2021-12-17 10:29:03,746 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 10:29:03" (1/1) ... [2021-12-17 10:29:03,746 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 10:29:03" (1/1) ... [2021-12-17 10:29:03,747 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 10:29:03" (1/1) ... [2021-12-17 10:29:03,750 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 10:29:03" (1/1) ... [2021-12-17 10:29:03,751 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 10:29:03" (1/1) ... [2021-12-17 10:29:03,752 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-17 10:29:03,752 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-17 10:29:03,752 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-17 10:29:03,752 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-17 10:29:03,753 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 10:29:03" (1/1) ... [2021-12-17 10:29:03,757 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-17 10:29:03,763 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:29:03,772 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) [2021-12-17 10:29:03,776 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 [2021-12-17 10:29:03,793 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-17 10:29:03,793 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-17 10:29:03,793 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-17 10:29:03,793 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-17 10:29:03,833 INFO L236 CfgBuilder]: Building ICFG [2021-12-17 10:29:03,834 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-17 10:29:03,915 INFO L277 CfgBuilder]: Performing block encoding [2021-12-17 10:29:03,918 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-17 10:29:03,919 INFO L301 CfgBuilder]: Removed 6 assume(true) statements. [2021-12-17 10:29:03,920 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.12 10:29:03 BoogieIcfgContainer [2021-12-17 10:29:03,920 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-17 10:29:03,921 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-17 10:29:03,921 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-17 10:29:03,923 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-17 10:29:03,923 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.12 10:29:03" (1/3) ... [2021-12-17 10:29:03,924 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4fb9f34b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.12 10:29:03, skipping insertion in model container [2021-12-17 10:29:03,924 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 10:29:03" (2/3) ... [2021-12-17 10:29:03,924 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4fb9f34b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.12 10:29:03, skipping insertion in model container [2021-12-17 10:29:03,925 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.12 10:29:03" (3/3) ... [2021-12-17 10:29:03,925 INFO L111 eAbstractionObserver]: Analyzing ICFG in-de61.c [2021-12-17 10:29:03,931 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-17 10:29:03,931 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-17 10:29:03,976 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-17 10:29:03,980 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=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-17 10:29:03,980 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-17 10:29:04,020 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 16 states have internal predecessors, (29), 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) [2021-12-17 10:29:04,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-12-17 10:29:04,023 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:29:04,023 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:29:04,024 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:29:04,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:29:04,027 INFO L85 PathProgramCache]: Analyzing trace with hash 1928996963, now seen corresponding path program 1 times [2021-12-17 10:29:04,032 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:29:04,033 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [355843321] [2021-12-17 10:29:04,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:29:04,033 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:29:04,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:29:04,159 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:29:04,160 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:29:04,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [355843321] [2021-12-17 10:29:04,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [355843321] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 10:29:04,162 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 10:29:04,162 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-17 10:29:04,163 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507112521] [2021-12-17 10:29:04,163 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 10:29:04,166 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-17 10:29:04,167 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:29:04,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-17 10:29:04,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-17 10:29:04,191 INFO L87 Difference]: Start difference. First operand has 17 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 16 states have internal predecessors, (29), 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) Second operand has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 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) [2021-12-17 10:29:04,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:29:04,202 INFO L93 Difference]: Finished difference Result 31 states and 53 transitions. [2021-12-17 10:29:04,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-17 10:29:04,204 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 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 12 [2021-12-17 10:29:04,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:29:04,209 INFO L225 Difference]: With dead ends: 31 [2021-12-17 10:29:04,209 INFO L226 Difference]: Without dead ends: 13 [2021-12-17 10:29:04,212 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-17 10:29:04,216 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-17 10:29:04,217 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-17 10:29:04,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-12-17 10:29:04,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-12-17 10:29:04,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.5) internal successors, (18), 12 states have internal predecessors, (18), 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) [2021-12-17 10:29:04,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 18 transitions. [2021-12-17 10:29:04,243 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 18 transitions. Word has length 12 [2021-12-17 10:29:04,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:29:04,243 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 18 transitions. [2021-12-17 10:29:04,244 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 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) [2021-12-17 10:29:04,244 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 18 transitions. [2021-12-17 10:29:04,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-12-17 10:29:04,244 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:29:04,245 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:29:04,245 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-17 10:29:04,245 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:29:04,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:29:04,248 INFO L85 PathProgramCache]: Analyzing trace with hash 1814480359, now seen corresponding path program 1 times [2021-12-17 10:29:04,248 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:29:04,248 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1587313243] [2021-12-17 10:29:04,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:29:04,249 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:29:04,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:29:04,496 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:29:04,496 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:29:04,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1587313243] [2021-12-17 10:29:04,496 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1587313243] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 10:29:04,497 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 10:29:04,497 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-17 10:29:04,497 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725838565] [2021-12-17 10:29:04,497 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 10:29:04,498 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-17 10:29:04,498 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:29:04,498 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-17 10:29:04,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-12-17 10:29:04,499 INFO L87 Difference]: Start difference. First operand 13 states and 18 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 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) [2021-12-17 10:29:04,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:29:04,617 INFO L93 Difference]: Finished difference Result 31 states and 46 transitions. [2021-12-17 10:29:04,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-17 10:29:04,618 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 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 12 [2021-12-17 10:29:04,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:29:04,619 INFO L225 Difference]: With dead ends: 31 [2021-12-17 10:29:04,619 INFO L226 Difference]: Without dead ends: 14 [2021-12-17 10:29:04,619 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-12-17 10:29:04,620 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 21 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-17 10:29:04,621 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 34 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-17 10:29:04,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-12-17 10:29:04,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-12-17 10:29:04,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 13 states have internal predecessors, (19), 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) [2021-12-17 10:29:04,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 19 transitions. [2021-12-17 10:29:04,628 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 19 transitions. Word has length 12 [2021-12-17 10:29:04,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:29:04,629 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 19 transitions. [2021-12-17 10:29:04,629 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 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) [2021-12-17 10:29:04,629 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 19 transitions. [2021-12-17 10:29:04,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-12-17 10:29:04,630 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:29:04,631 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:29:04,633 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-17 10:29:04,633 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:29:04,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:29:04,634 INFO L85 PathProgramCache]: Analyzing trace with hash -1427170164, now seen corresponding path program 1 times [2021-12-17 10:29:04,634 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:29:04,635 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1879131035] [2021-12-17 10:29:04,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:29:04,635 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:29:04,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:29:04,708 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:29:04,708 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:29:04,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1879131035] [2021-12-17 10:29:04,709 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1879131035] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:29:04,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1877890473] [2021-12-17 10:29:04,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:29:04,709 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:29:04,710 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:29:04,711 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) [2021-12-17 10:29:04,726 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-17 10:29:04,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:29:04,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-17 10:29:04,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:29:04,817 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:29:04,817 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:29:04,859 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:29:04,859 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1877890473] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:29:04,859 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:29:04,859 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2021-12-17 10:29:04,860 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765337284] [2021-12-17 10:29:04,860 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:29:04,860 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-17 10:29:04,860 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:29:04,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-17 10:29:04,861 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-12-17 10:29:04,861 INFO L87 Difference]: Start difference. First operand 14 states and 19 transitions. Second operand has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 9 states have internal predecessors, (20), 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) [2021-12-17 10:29:04,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:29:04,972 INFO L93 Difference]: Finished difference Result 58 states and 94 transitions. [2021-12-17 10:29:04,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-17 10:29:04,973 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 9 states have internal predecessors, (20), 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 13 [2021-12-17 10:29:04,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:29:04,975 INFO L225 Difference]: With dead ends: 58 [2021-12-17 10:29:04,975 INFO L226 Difference]: Without dead ends: 50 [2021-12-17 10:29:04,978 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2021-12-17 10:29:04,984 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 45 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-17 10:29:04,985 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 55 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-17 10:29:04,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-12-17 10:29:04,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 37. [2021-12-17 10:29:04,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.5277777777777777) internal successors, (55), 36 states have internal predecessors, (55), 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) [2021-12-17 10:29:04,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 55 transitions. [2021-12-17 10:29:04,995 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 55 transitions. Word has length 13 [2021-12-17 10:29:04,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:29:04,995 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 55 transitions. [2021-12-17 10:29:04,995 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 9 states have internal predecessors, (20), 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) [2021-12-17 10:29:04,996 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 55 transitions. [2021-12-17 10:29:04,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-12-17 10:29:04,997 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:29:04,997 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:29:05,023 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-17 10:29:05,211 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:29:05,212 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:29:05,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:29:05,212 INFO L85 PathProgramCache]: Analyzing trace with hash -603304611, now seen corresponding path program 1 times [2021-12-17 10:29:05,212 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:29:05,212 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [732926405] [2021-12-17 10:29:05,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:29:05,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:29:05,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:29:05,270 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:29:05,271 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:29:05,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [732926405] [2021-12-17 10:29:05,271 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [732926405] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:29:05,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [397360449] [2021-12-17 10:29:05,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:29:05,271 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:29:05,271 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:29:05,272 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) [2021-12-17 10:29:05,273 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-17 10:29:05,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:29:05,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-17 10:29:05,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:29:05,347 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-17 10:29:05,347 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:29:05,384 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-17 10:29:05,385 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [397360449] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:29:05,385 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:29:05,385 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4, 4] total 9 [2021-12-17 10:29:05,385 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29938891] [2021-12-17 10:29:05,385 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:29:05,385 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-17 10:29:05,386 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:29:05,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-17 10:29:05,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-12-17 10:29:05,386 INFO L87 Difference]: Start difference. First operand 37 states and 55 transitions. Second operand has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 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) [2021-12-17 10:29:05,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:29:05,579 INFO L93 Difference]: Finished difference Result 107 states and 151 transitions. [2021-12-17 10:29:05,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-17 10:29:05,579 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 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 15 [2021-12-17 10:29:05,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:29:05,580 INFO L225 Difference]: With dead ends: 107 [2021-12-17 10:29:05,580 INFO L226 Difference]: Without dead ends: 87 [2021-12-17 10:29:05,580 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2021-12-17 10:29:05,581 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 48 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 173 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 173 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-17 10:29:05,581 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 107 Invalid, 200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 173 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-17 10:29:05,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-12-17 10:29:05,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 49. [2021-12-17 10:29:05,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.4375) internal successors, (69), 48 states have internal predecessors, (69), 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) [2021-12-17 10:29:05,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 69 transitions. [2021-12-17 10:29:05,586 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 69 transitions. Word has length 15 [2021-12-17 10:29:05,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:29:05,586 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 69 transitions. [2021-12-17 10:29:05,587 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 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) [2021-12-17 10:29:05,587 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 69 transitions. [2021-12-17 10:29:05,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-12-17 10:29:05,587 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:29:05,587 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:29:05,606 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-17 10:29:05,803 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,SelfDestructingSolverStorable3 [2021-12-17 10:29:05,803 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:29:05,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:29:05,804 INFO L85 PathProgramCache]: Analyzing trace with hash 114935591, now seen corresponding path program 2 times [2021-12-17 10:29:05,804 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:29:05,804 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [486730303] [2021-12-17 10:29:05,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:29:05,804 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:29:05,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:29:05,872 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:29:05,872 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:29:05,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [486730303] [2021-12-17 10:29:05,872 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [486730303] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:29:05,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1409758629] [2021-12-17 10:29:05,872 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-17 10:29:05,873 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:29:05,873 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:29:05,874 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) [2021-12-17 10:29:05,875 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-17 10:29:05,915 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-17 10:29:05,915 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 10:29:05,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-17 10:29:05,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:29:05,986 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:29:05,987 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:29:06,065 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:29:06,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1409758629] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:29:06,065 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:29:06,065 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2021-12-17 10:29:06,065 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1388363807] [2021-12-17 10:29:06,065 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:29:06,066 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-17 10:29:06,066 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:29:06,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-17 10:29:06,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2021-12-17 10:29:06,067 INFO L87 Difference]: Start difference. First operand 49 states and 69 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 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) [2021-12-17 10:29:06,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:29:06,680 INFO L93 Difference]: Finished difference Result 188 states and 307 transitions. [2021-12-17 10:29:06,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-12-17 10:29:06,680 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 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 16 [2021-12-17 10:29:06,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:29:06,681 INFO L225 Difference]: With dead ends: 188 [2021-12-17 10:29:06,681 INFO L226 Difference]: Without dead ends: 174 [2021-12-17 10:29:06,682 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 198 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=301, Invalid=691, Unknown=0, NotChecked=0, Total=992 [2021-12-17 10:29:06,682 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 264 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 191 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 264 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 405 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 191 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-17 10:29:06,682 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [264 Valid, 169 Invalid, 405 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [191 Valid, 214 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-17 10:29:06,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2021-12-17 10:29:06,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 106. [2021-12-17 10:29:06,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 105 states have (on average 1.4952380952380953) internal successors, (157), 105 states have internal predecessors, (157), 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) [2021-12-17 10:29:06,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 157 transitions. [2021-12-17 10:29:06,694 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 157 transitions. Word has length 16 [2021-12-17 10:29:06,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:29:06,694 INFO L470 AbstractCegarLoop]: Abstraction has 106 states and 157 transitions. [2021-12-17 10:29:06,694 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 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) [2021-12-17 10:29:06,694 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 157 transitions. [2021-12-17 10:29:06,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-12-17 10:29:06,695 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:29:06,695 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:29:06,711 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-17 10:29:06,899 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:29:06,899 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:29:06,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:29:06,900 INFO L85 PathProgramCache]: Analyzing trace with hash 188466470, now seen corresponding path program 1 times [2021-12-17 10:29:06,900 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:29:06,900 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1745564924] [2021-12-17 10:29:06,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:29:06,900 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:29:06,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:29:07,142 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-17 10:29:07,142 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:29:07,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1745564924] [2021-12-17 10:29:07,143 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1745564924] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:29:07,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1219529487] [2021-12-17 10:29:07,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:29:07,143 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:29:07,143 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:29:07,144 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) [2021-12-17 10:29:07,177 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-17 10:29:07,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:29:07,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 32 conjunts are in the unsatisfiable core [2021-12-17 10:29:07,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:29:07,426 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:29:07,426 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:29:07,751 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:29:07,751 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1219529487] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:29:07,752 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:29:07,752 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 11] total 22 [2021-12-17 10:29:07,752 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304331397] [2021-12-17 10:29:07,753 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:29:07,753 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-12-17 10:29:07,753 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:29:07,753 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-12-17 10:29:07,754 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=378, Unknown=0, NotChecked=0, Total=462 [2021-12-17 10:29:07,755 INFO L87 Difference]: Start difference. First operand 106 states and 157 transitions. Second operand has 22 states, 22 states have (on average 2.0454545454545454) internal successors, (45), 22 states have internal predecessors, (45), 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) [2021-12-17 10:29:08,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:29:08,699 INFO L93 Difference]: Finished difference Result 191 states and 264 transitions. [2021-12-17 10:29:08,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-12-17 10:29:08,699 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0454545454545454) internal successors, (45), 22 states have internal predecessors, (45), 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 18 [2021-12-17 10:29:08,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:29:08,700 INFO L225 Difference]: With dead ends: 191 [2021-12-17 10:29:08,700 INFO L226 Difference]: Without dead ends: 146 [2021-12-17 10:29:08,700 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 22 SyntacticMatches, 3 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 388 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=310, Invalid=1330, Unknown=0, NotChecked=0, Total=1640 [2021-12-17 10:29:08,701 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 114 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 422 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 478 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 422 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-17 10:29:08,701 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [114 Valid, 83 Invalid, 478 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 422 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-17 10:29:08,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-12-17 10:29:08,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 84. [2021-12-17 10:29:08,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 83 states have (on average 1.5542168674698795) internal successors, (129), 83 states have internal predecessors, (129), 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) [2021-12-17 10:29:08,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 129 transitions. [2021-12-17 10:29:08,708 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 129 transitions. Word has length 18 [2021-12-17 10:29:08,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:29:08,708 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 129 transitions. [2021-12-17 10:29:08,708 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.0454545454545454) internal successors, (45), 22 states have internal predecessors, (45), 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) [2021-12-17 10:29:08,708 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 129 transitions. [2021-12-17 10:29:08,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-12-17 10:29:08,709 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:29:08,709 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:29:08,729 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-17 10:29:08,923 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:29:08,923 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:29:08,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:29:08,924 INFO L85 PathProgramCache]: Analyzing trace with hash 748617255, now seen corresponding path program 2 times [2021-12-17 10:29:08,924 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:29:08,924 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1961342892] [2021-12-17 10:29:08,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:29:08,924 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:29:08,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:29:08,991 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:29:08,991 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:29:08,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1961342892] [2021-12-17 10:29:08,991 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1961342892] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:29:08,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [895619996] [2021-12-17 10:29:08,992 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-17 10:29:08,992 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:29:08,992 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:29:08,993 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) [2021-12-17 10:29:08,994 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-17 10:29:09,017 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-17 10:29:09,018 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 10:29:09,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-17 10:29:09,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:29:09,064 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-17 10:29:09,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:29:09,091 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-17 10:29:09,091 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [895619996] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:29:09,091 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:29:09,092 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 5, 5] total 12 [2021-12-17 10:29:09,092 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178099279] [2021-12-17 10:29:09,092 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:29:09,092 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-17 10:29:09,092 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:29:09,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-17 10:29:09,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2021-12-17 10:29:09,093 INFO L87 Difference]: Start difference. First operand 84 states and 129 transitions. Second operand has 12 states, 12 states have (on average 2.5) internal successors, (30), 12 states have internal predecessors, (30), 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) [2021-12-17 10:29:09,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:29:09,440 INFO L93 Difference]: Finished difference Result 264 states and 385 transitions. [2021-12-17 10:29:09,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-12-17 10:29:09,440 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 12 states have internal predecessors, (30), 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 18 [2021-12-17 10:29:09,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:29:09,441 INFO L225 Difference]: With dead ends: 264 [2021-12-17 10:29:09,441 INFO L226 Difference]: Without dead ends: 227 [2021-12-17 10:29:09,442 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=152, Invalid=840, Unknown=0, NotChecked=0, Total=992 [2021-12-17 10:29:09,442 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 101 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 346 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 176 SdHoareTripleChecker+Invalid, 413 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 346 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-17 10:29:09,442 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [101 Valid, 176 Invalid, 413 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 346 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-17 10:29:09,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2021-12-17 10:29:09,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 121. [2021-12-17 10:29:09,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 120 states have (on average 1.4833333333333334) internal successors, (178), 120 states have internal predecessors, (178), 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) [2021-12-17 10:29:09,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 178 transitions. [2021-12-17 10:29:09,451 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 178 transitions. Word has length 18 [2021-12-17 10:29:09,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:29:09,452 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 178 transitions. [2021-12-17 10:29:09,452 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 12 states have internal predecessors, (30), 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) [2021-12-17 10:29:09,452 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 178 transitions. [2021-12-17 10:29:09,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-12-17 10:29:09,453 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:29:09,453 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:29:09,471 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-17 10:29:09,667 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:29:09,667 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:29:09,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:29:09,668 INFO L85 PathProgramCache]: Analyzing trace with hash 48319293, now seen corresponding path program 1 times [2021-12-17 10:29:09,668 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:29:09,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1955957652] [2021-12-17 10:29:09,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:29:09,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:29:09,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:29:09,745 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-17 10:29:09,746 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:29:09,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1955957652] [2021-12-17 10:29:09,746 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1955957652] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:29:09,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [294591702] [2021-12-17 10:29:09,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:29:09,746 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:29:09,747 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:29:09,747 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) [2021-12-17 10:29:09,748 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-17 10:29:09,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:29:09,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-17 10:29:09,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:29:09,828 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-17 10:29:09,828 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:29:09,884 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-17 10:29:09,885 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [294591702] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:29:09,885 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:29:09,885 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 6] total 14 [2021-12-17 10:29:09,885 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083520255] [2021-12-17 10:29:09,885 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:29:09,885 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-12-17 10:29:09,885 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:29:09,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-12-17 10:29:09,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-12-17 10:29:09,886 INFO L87 Difference]: Start difference. First operand 121 states and 178 transitions. Second operand has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 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) [2021-12-17 10:29:10,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:29:10,099 INFO L93 Difference]: Finished difference Result 209 states and 303 transitions. [2021-12-17 10:29:10,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-12-17 10:29:10,099 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 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 21 [2021-12-17 10:29:10,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:29:10,100 INFO L225 Difference]: With dead ends: 209 [2021-12-17 10:29:10,100 INFO L226 Difference]: Without dead ends: 173 [2021-12-17 10:29:10,100 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=87, Invalid=375, Unknown=0, NotChecked=0, Total=462 [2021-12-17 10:29:10,101 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 57 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 212 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 212 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-17 10:29:10,101 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 124 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 212 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-17 10:29:10,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-12-17 10:29:10,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 129. [2021-12-17 10:29:10,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 128 states have (on average 1.4765625) internal successors, (189), 128 states have internal predecessors, (189), 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) [2021-12-17 10:29:10,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 189 transitions. [2021-12-17 10:29:10,107 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 189 transitions. Word has length 21 [2021-12-17 10:29:10,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:29:10,107 INFO L470 AbstractCegarLoop]: Abstraction has 129 states and 189 transitions. [2021-12-17 10:29:10,107 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 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) [2021-12-17 10:29:10,108 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 189 transitions. [2021-12-17 10:29:10,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-12-17 10:29:10,108 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:29:10,108 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:29:10,125 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-12-17 10:29:10,319 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:29:10,319 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:29:10,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:29:10,320 INFO L85 PathProgramCache]: Analyzing trace with hash 1411583389, now seen corresponding path program 3 times [2021-12-17 10:29:10,320 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:29:10,320 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [148652355] [2021-12-17 10:29:10,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:29:10,320 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:29:10,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:29:10,416 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:29:10,416 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:29:10,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [148652355] [2021-12-17 10:29:10,416 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [148652355] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:29:10,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [386359305] [2021-12-17 10:29:10,417 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-17 10:29:10,417 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:29:10,417 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:29:10,418 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) [2021-12-17 10:29:10,419 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-17 10:29:10,445 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-12-17 10:29:10,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 10:29:10,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-17 10:29:10,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:29:10,523 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-17 10:29:10,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:29:10,565 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-17 10:29:10,565 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [386359305] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:29:10,565 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:29:10,565 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6, 6] total 15 [2021-12-17 10:29:10,565 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562936981] [2021-12-17 10:29:10,566 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:29:10,566 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-17 10:29:10,566 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:29:10,566 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-17 10:29:10,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2021-12-17 10:29:10,567 INFO L87 Difference]: Start difference. First operand 129 states and 189 transitions. Second operand has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 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) [2021-12-17 10:29:11,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:29:11,860 INFO L93 Difference]: Finished difference Result 400 states and 550 transitions. [2021-12-17 10:29:11,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-12-17 10:29:11,860 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 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 21 [2021-12-17 10:29:11,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:29:11,861 INFO L225 Difference]: With dead ends: 400 [2021-12-17 10:29:11,861 INFO L226 Difference]: Without dead ends: 364 [2021-12-17 10:29:11,863 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1511 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=524, Invalid=4446, Unknown=0, NotChecked=0, Total=4970 [2021-12-17 10:29:11,864 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 233 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 783 mSolverCounterSat, 167 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 233 SdHoareTripleChecker+Valid, 248 SdHoareTripleChecker+Invalid, 950 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 167 IncrementalHoareTripleChecker+Valid, 783 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-17 10:29:11,864 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [233 Valid, 248 Invalid, 950 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [167 Valid, 783 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-17 10:29:11,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 364 states. [2021-12-17 10:29:11,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 364 to 153. [2021-12-17 10:29:11,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.480263157894737) internal successors, (225), 152 states have internal predecessors, (225), 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) [2021-12-17 10:29:11,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 225 transitions. [2021-12-17 10:29:11,870 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 225 transitions. Word has length 21 [2021-12-17 10:29:11,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:29:11,870 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 225 transitions. [2021-12-17 10:29:11,870 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 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) [2021-12-17 10:29:11,871 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 225 transitions. [2021-12-17 10:29:11,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-12-17 10:29:11,871 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:29:11,871 INFO L514 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:29:11,903 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-12-17 10:29:12,087 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:29:12,087 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:29:12,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:29:12,088 INFO L85 PathProgramCache]: Analyzing trace with hash -1195101891, now seen corresponding path program 2 times [2021-12-17 10:29:12,088 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:29:12,088 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1528945871] [2021-12-17 10:29:12,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:29:12,088 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:29:12,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:29:12,186 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-17 10:29:12,186 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:29:12,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1528945871] [2021-12-17 10:29:12,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1528945871] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:29:12,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1084068856] [2021-12-17 10:29:12,187 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-17 10:29:12,187 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:29:12,187 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:29:12,187 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) [2021-12-17 10:29:12,188 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-17 10:29:12,218 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-17 10:29:12,218 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 10:29:12,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 19 conjunts are in the unsatisfiable core [2021-12-17 10:29:12,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:29:12,285 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-17 10:29:12,285 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:29:12,375 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-17 10:29:12,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1084068856] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:29:12,376 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:29:12,376 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 16 [2021-12-17 10:29:12,376 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468030406] [2021-12-17 10:29:12,376 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:29:12,376 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-17 10:29:12,376 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:29:12,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-17 10:29:12,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=176, Unknown=0, NotChecked=0, Total=240 [2021-12-17 10:29:12,376 INFO L87 Difference]: Start difference. First operand 153 states and 225 transitions. Second operand has 16 states, 16 states have (on average 3.0) internal successors, (48), 16 states have internal predecessors, (48), 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) [2021-12-17 10:29:13,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:29:13,107 INFO L93 Difference]: Finished difference Result 371 states and 579 transitions. [2021-12-17 10:29:13,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-12-17 10:29:13,108 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.0) internal successors, (48), 16 states have internal predecessors, (48), 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 21 [2021-12-17 10:29:13,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:29:13,109 INFO L225 Difference]: With dead ends: 371 [2021-12-17 10:29:13,109 INFO L226 Difference]: Without dead ends: 330 [2021-12-17 10:29:13,110 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=317, Invalid=675, Unknown=0, NotChecked=0, Total=992 [2021-12-17 10:29:13,110 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 293 mSDsluCounter, 199 mSDsCounter, 0 mSdLazyCounter, 285 mSolverCounterSat, 196 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 293 SdHoareTripleChecker+Valid, 232 SdHoareTripleChecker+Invalid, 481 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 196 IncrementalHoareTripleChecker+Valid, 285 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-17 10:29:13,110 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [293 Valid, 232 Invalid, 481 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [196 Valid, 285 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-17 10:29:13,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 330 states. [2021-12-17 10:29:13,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 330 to 197. [2021-12-17 10:29:13,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 196 states have (on average 1.4795918367346939) internal successors, (290), 196 states have internal predecessors, (290), 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) [2021-12-17 10:29:13,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 290 transitions. [2021-12-17 10:29:13,117 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 290 transitions. Word has length 21 [2021-12-17 10:29:13,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:29:13,117 INFO L470 AbstractCegarLoop]: Abstraction has 197 states and 290 transitions. [2021-12-17 10:29:13,117 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.0) internal successors, (48), 16 states have internal predecessors, (48), 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) [2021-12-17 10:29:13,117 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 290 transitions. [2021-12-17 10:29:13,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-12-17 10:29:13,118 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:29:13,118 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:29:13,138 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-12-17 10:29:13,331 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,SelfDestructingSolverStorable9 [2021-12-17 10:29:13,331 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:29:13,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:29:13,332 INFO L85 PathProgramCache]: Analyzing trace with hash 1372519271, now seen corresponding path program 2 times [2021-12-17 10:29:13,332 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:29:13,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [645377700] [2021-12-17 10:29:13,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:29:13,332 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:29:13,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:29:13,382 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-17 10:29:13,382 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:29:13,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [645377700] [2021-12-17 10:29:13,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [645377700] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:29:13,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1975500792] [2021-12-17 10:29:13,382 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-17 10:29:13,382 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:29:13,383 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:29:13,383 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) [2021-12-17 10:29:13,384 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-17 10:29:13,412 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-17 10:29:13,413 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 10:29:13,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-17 10:29:13,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:29:13,444 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-17 10:29:13,444 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:29:13,480 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-17 10:29:13,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1975500792] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:29:13,481 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:29:13,481 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 5 [2021-12-17 10:29:13,481 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1520052320] [2021-12-17 10:29:13,481 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:29:13,482 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-17 10:29:13,482 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:29:13,482 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-17 10:29:13,482 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-17 10:29:13,482 INFO L87 Difference]: Start difference. First operand 197 states and 290 transitions. Second operand has 5 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 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) [2021-12-17 10:29:13,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:29:13,538 INFO L93 Difference]: Finished difference Result 312 states and 439 transitions. [2021-12-17 10:29:13,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-17 10:29:13,538 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 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 22 [2021-12-17 10:29:13,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:29:13,540 INFO L225 Difference]: With dead ends: 312 [2021-12-17 10:29:13,540 INFO L226 Difference]: Without dead ends: 300 [2021-12-17 10:29:13,540 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 42 SyntacticMatches, 3 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-12-17 10:29:13,540 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 30 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-17 10:29:13,541 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 77 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-17 10:29:13,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 300 states. [2021-12-17 10:29:13,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 300 to 208. [2021-12-17 10:29:13,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 207 states have (on average 1.4492753623188406) internal successors, (300), 207 states have internal predecessors, (300), 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) [2021-12-17 10:29:13,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 300 transitions. [2021-12-17 10:29:13,548 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 300 transitions. Word has length 22 [2021-12-17 10:29:13,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:29:13,548 INFO L470 AbstractCegarLoop]: Abstraction has 208 states and 300 transitions. [2021-12-17 10:29:13,548 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 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) [2021-12-17 10:29:13,548 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 300 transitions. [2021-12-17 10:29:13,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-12-17 10:29:13,549 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:29:13,549 INFO L514 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:29:13,566 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-12-17 10:29:13,763 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:29:13,763 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:29:13,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:29:13,764 INFO L85 PathProgramCache]: Analyzing trace with hash -677222036, now seen corresponding path program 3 times [2021-12-17 10:29:13,764 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:29:13,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165585988] [2021-12-17 10:29:13,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:29:13,764 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:29:13,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:29:13,899 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:29:13,899 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:29:13,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165585988] [2021-12-17 10:29:13,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1165585988] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:29:13,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1977063117] [2021-12-17 10:29:13,899 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-17 10:29:13,899 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:29:13,900 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:29:13,903 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) [2021-12-17 10:29:13,907 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-17 10:29:13,961 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-12-17 10:29:13,961 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 10:29:13,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 25 conjunts are in the unsatisfiable core [2021-12-17 10:29:13,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:29:14,035 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:29:14,035 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:29:14,249 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:29:14,250 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1977063117] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:29:14,250 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:29:14,250 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 27 [2021-12-17 10:29:14,250 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091305679] [2021-12-17 10:29:14,250 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:29:14,250 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-17 10:29:14,250 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:29:14,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-17 10:29:14,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=508, Unknown=0, NotChecked=0, Total=702 [2021-12-17 10:29:14,251 INFO L87 Difference]: Start difference. First operand 208 states and 300 transitions. Second operand has 27 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 27 states have internal predecessors, (42), 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) [2021-12-17 10:29:28,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:29:28,019 INFO L93 Difference]: Finished difference Result 745 states and 1192 transitions. [2021-12-17 10:29:28,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-12-17 10:29:28,020 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 27 states have internal predecessors, (42), 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 23 [2021-12-17 10:29:28,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:29:28,022 INFO L225 Difference]: With dead ends: 745 [2021-12-17 10:29:28,022 INFO L226 Difference]: Without dead ends: 709 [2021-12-17 10:29:28,022 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 32 SyntacticMatches, 3 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 250 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=811, Invalid=1541, Unknown=0, NotChecked=0, Total=2352 [2021-12-17 10:29:28,023 INFO L933 BasicCegarLoop]: 70 mSDtfsCounter, 1272 mSDsluCounter, 812 mSDsCounter, 0 mSdLazyCounter, 844 mSolverCounterSat, 768 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1272 SdHoareTripleChecker+Valid, 882 SdHoareTripleChecker+Invalid, 1612 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 768 IncrementalHoareTripleChecker+Valid, 844 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-12-17 10:29:28,023 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1272 Valid, 882 Invalid, 1612 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [768 Valid, 844 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2021-12-17 10:29:28,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 709 states. [2021-12-17 10:29:28,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 709 to 341. [2021-12-17 10:29:28,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 341 states, 340 states have (on average 1.4794117647058824) internal successors, (503), 340 states have internal predecessors, (503), 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) [2021-12-17 10:29:28,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 503 transitions. [2021-12-17 10:29:28,034 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 503 transitions. Word has length 23 [2021-12-17 10:29:28,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:29:28,034 INFO L470 AbstractCegarLoop]: Abstraction has 341 states and 503 transitions. [2021-12-17 10:29:28,034 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 27 states have internal predecessors, (42), 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) [2021-12-17 10:29:28,034 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 503 transitions. [2021-12-17 10:29:28,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-12-17 10:29:28,035 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:29:28,035 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:29:28,053 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-12-17 10:29:28,250 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-12-17 10:29:28,251 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:29:28,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:29:28,251 INFO L85 PathProgramCache]: Analyzing trace with hash -11866489, now seen corresponding path program 3 times [2021-12-17 10:29:28,251 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:29:28,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2119113099] [2021-12-17 10:29:28,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:29:28,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:29:28,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:29:28,491 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-17 10:29:28,491 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:29:28,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2119113099] [2021-12-17 10:29:28,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2119113099] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:29:28,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2078676459] [2021-12-17 10:29:28,492 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-17 10:29:28,492 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:29:28,492 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:29:28,493 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-17 10:29:28,493 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-12-17 10:29:28,570 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-12-17 10:29:28,570 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 10:29:28,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 44 conjunts are in the unsatisfiable core [2021-12-17 10:29:28,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:29:29,752 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:29:29,752 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:29:31,121 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:29:31,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2078676459] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:29:31,121 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:29:31,121 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15, 15] total 30 [2021-12-17 10:29:31,121 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2134290915] [2021-12-17 10:29:31,121 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:29:31,121 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-12-17 10:29:31,121 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:29:31,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-12-17 10:29:31,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=755, Unknown=0, NotChecked=0, Total=870 [2021-12-17 10:29:31,122 INFO L87 Difference]: Start difference. First operand 341 states and 503 transitions. Second operand has 30 states, 30 states have (on average 1.9666666666666666) internal successors, (59), 30 states have internal predecessors, (59), 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) [2021-12-17 10:29:45,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:29:45,158 INFO L93 Difference]: Finished difference Result 500 states and 702 transitions. [2021-12-17 10:29:45,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-12-17 10:29:45,158 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.9666666666666666) internal successors, (59), 30 states have internal predecessors, (59), 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 24 [2021-12-17 10:29:45,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:29:45,160 INFO L225 Difference]: With dead ends: 500 [2021-12-17 10:29:45,160 INFO L226 Difference]: Without dead ends: 404 [2021-12-17 10:29:45,161 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 29 SyntacticMatches, 5 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 530 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=510, Invalid=2570, Unknown=0, NotChecked=0, Total=3080 [2021-12-17 10:29:45,161 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 167 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 539 mSolverCounterSat, 126 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 167 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 665 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 126 IncrementalHoareTripleChecker+Valid, 539 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2021-12-17 10:29:45,161 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [167 Valid, 111 Invalid, 665 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [126 Valid, 539 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2021-12-17 10:29:45,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 404 states. [2021-12-17 10:29:45,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 404 to 322. [2021-12-17 10:29:45,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 321 states have (on average 1.4579439252336448) internal successors, (468), 321 states have internal predecessors, (468), 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) [2021-12-17 10:29:45,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 468 transitions. [2021-12-17 10:29:45,189 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 468 transitions. Word has length 24 [2021-12-17 10:29:45,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:29:45,189 INFO L470 AbstractCegarLoop]: Abstraction has 322 states and 468 transitions. [2021-12-17 10:29:45,189 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.9666666666666666) internal successors, (59), 30 states have internal predecessors, (59), 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) [2021-12-17 10:29:45,189 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 468 transitions. [2021-12-17 10:29:45,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-12-17 10:29:45,191 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:29:45,191 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:29:45,207 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-12-17 10:29:45,399 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-12-17 10:29:45,399 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:29:45,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:29:45,400 INFO L85 PathProgramCache]: Analyzing trace with hash -147642777, now seen corresponding path program 4 times [2021-12-17 10:29:45,400 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:29:45,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [804044577] [2021-12-17 10:29:45,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:29:45,400 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:29:45,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:29:45,505 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:29:45,505 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:29:45,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [804044577] [2021-12-17 10:29:45,505 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [804044577] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:29:45,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [155567676] [2021-12-17 10:29:45,506 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-17 10:29:45,506 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:29:45,506 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:29:45,507 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-17 10:29:45,508 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-12-17 10:29:45,543 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-17 10:29:45,543 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 10:29:45,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-17 10:29:45,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:29:45,653 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-17 10:29:45,653 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:29:45,686 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-17 10:29:45,686 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [155567676] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:29:45,686 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:29:45,686 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 7, 7] total 18 [2021-12-17 10:29:45,686 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [408940018] [2021-12-17 10:29:45,686 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:29:45,687 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-12-17 10:29:45,687 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:29:45,687 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-12-17 10:29:45,687 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2021-12-17 10:29:45,687 INFO L87 Difference]: Start difference. First operand 322 states and 468 transitions. Second operand has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 18 states have internal predecessors, (40), 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) [2021-12-17 10:29:48,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:29:48,404 INFO L93 Difference]: Finished difference Result 906 states and 1272 transitions. [2021-12-17 10:29:48,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2021-12-17 10:29:48,405 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 18 states have internal predecessors, (40), 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 24 [2021-12-17 10:29:48,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:29:48,407 INFO L225 Difference]: With dead ends: 906 [2021-12-17 10:29:48,407 INFO L226 Difference]: Without dead ends: 828 [2021-12-17 10:29:48,409 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3704 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=926, Invalid=9994, Unknown=0, NotChecked=0, Total=10920 [2021-12-17 10:29:48,409 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 333 mSDsluCounter, 313 mSDsCounter, 0 mSdLazyCounter, 1313 mSolverCounterSat, 309 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 333 SdHoareTripleChecker+Valid, 347 SdHoareTripleChecker+Invalid, 1622 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 309 IncrementalHoareTripleChecker+Valid, 1313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-12-17 10:29:48,409 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [333 Valid, 347 Invalid, 1622 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [309 Valid, 1313 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-12-17 10:29:48,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 828 states. [2021-12-17 10:29:48,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 828 to 374. [2021-12-17 10:29:48,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 374 states, 373 states have (on average 1.4745308310991958) internal successors, (550), 373 states have internal predecessors, (550), 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) [2021-12-17 10:29:48,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 374 states to 374 states and 550 transitions. [2021-12-17 10:29:48,422 INFO L78 Accepts]: Start accepts. Automaton has 374 states and 550 transitions. Word has length 24 [2021-12-17 10:29:48,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:29:48,422 INFO L470 AbstractCegarLoop]: Abstraction has 374 states and 550 transitions. [2021-12-17 10:29:48,422 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 18 states have internal predecessors, (40), 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) [2021-12-17 10:29:48,422 INFO L276 IsEmpty]: Start isEmpty. Operand 374 states and 550 transitions. [2021-12-17 10:29:48,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-12-17 10:29:48,423 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:29:48,423 INFO L514 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:29:48,439 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-12-17 10:29:48,639 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-12-17 10:29:48,639 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:29:48,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:29:48,639 INFO L85 PathProgramCache]: Analyzing trace with hash -1534066082, now seen corresponding path program 1 times [2021-12-17 10:29:48,639 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:29:48,639 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [128313646] [2021-12-17 10:29:48,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:29:48,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:29:48,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:29:48,782 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-17 10:29:48,782 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:29:48,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [128313646] [2021-12-17 10:29:48,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [128313646] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:29:48,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2137134567] [2021-12-17 10:29:48,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:29:48,782 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:29:48,782 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:29:48,784 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-17 10:29:48,785 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-12-17 10:29:48,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:29:48,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 29 conjunts are in the unsatisfiable core [2021-12-17 10:29:48,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:29:48,903 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-17 10:29:48,904 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:29:49,171 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-17 10:29:49,171 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2137134567] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:29:49,171 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:29:49,171 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2021-12-17 10:29:49,171 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1448388061] [2021-12-17 10:29:49,171 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:29:49,172 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-12-17 10:29:49,172 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:29:49,172 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-12-17 10:29:49,172 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=700, Unknown=0, NotChecked=0, Total=930 [2021-12-17 10:29:49,172 INFO L87 Difference]: Start difference. First operand 374 states and 550 transitions. Second operand has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 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) [2021-12-17 10:30:29,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:30:29,916 INFO L93 Difference]: Finished difference Result 921 states and 1436 transitions. [2021-12-17 10:30:29,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-12-17 10:30:29,916 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 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 25 [2021-12-17 10:30:29,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:30:29,918 INFO L225 Difference]: With dead ends: 921 [2021-12-17 10:30:29,919 INFO L226 Difference]: Without dead ends: 818 [2021-12-17 10:30:29,920 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1511 ImplicationChecksByTransitivity, 38.7s TimeCoverageRelationStatistics Valid=1855, Invalid=4151, Unknown=0, NotChecked=0, Total=6006 [2021-12-17 10:30:29,920 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 1298 mSDsluCounter, 881 mSDsCounter, 0 mSdLazyCounter, 1242 mSolverCounterSat, 946 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1298 SdHoareTripleChecker+Valid, 945 SdHoareTripleChecker+Invalid, 2188 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 946 IncrementalHoareTripleChecker+Valid, 1242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-12-17 10:30:29,920 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1298 Valid, 945 Invalid, 2188 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [946 Valid, 1242 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2021-12-17 10:30:29,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 818 states. [2021-12-17 10:30:29,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 818 to 381. [2021-12-17 10:30:29,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 381 states, 380 states have (on average 1.4842105263157894) internal successors, (564), 380 states have internal predecessors, (564), 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) [2021-12-17 10:30:29,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 381 states to 381 states and 564 transitions. [2021-12-17 10:30:29,938 INFO L78 Accepts]: Start accepts. Automaton has 381 states and 564 transitions. Word has length 25 [2021-12-17 10:30:29,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:30:29,938 INFO L470 AbstractCegarLoop]: Abstraction has 381 states and 564 transitions. [2021-12-17 10:30:29,939 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 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) [2021-12-17 10:30:29,939 INFO L276 IsEmpty]: Start isEmpty. Operand 381 states and 564 transitions. [2021-12-17 10:30:29,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-12-17 10:30:29,939 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:30:29,939 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:30:29,955 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-12-17 10:30:30,146 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-12-17 10:30:30,146 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:30:30,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:30:30,146 INFO L85 PathProgramCache]: Analyzing trace with hash -1999602746, now seen corresponding path program 4 times [2021-12-17 10:30:30,146 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:30:30,147 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [889108648] [2021-12-17 10:30:30,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:30:30,147 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:30:30,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:30:30,220 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-17 10:30:30,220 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:30:30,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [889108648] [2021-12-17 10:30:30,221 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [889108648] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:30:30,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [499540114] [2021-12-17 10:30:30,221 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-17 10:30:30,221 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:30:30,221 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:30:30,222 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-17 10:30:30,223 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-12-17 10:30:30,253 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-17 10:30:30,253 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 10:30:30,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-17 10:30:30,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:30:30,314 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-12-17 10:30:30,314 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:30:30,369 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-12-17 10:30:30,369 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [499540114] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:30:30,369 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:30:30,369 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6, 6] total 12 [2021-12-17 10:30:30,369 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009995679] [2021-12-17 10:30:30,369 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:30:30,370 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-17 10:30:30,370 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:30:30,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-17 10:30:30,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2021-12-17 10:30:30,370 INFO L87 Difference]: Start difference. First operand 381 states and 564 transitions. Second operand has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 states have internal predecessors, (34), 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) [2021-12-17 10:30:30,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:30:30,503 INFO L93 Difference]: Finished difference Result 651 states and 926 transitions. [2021-12-17 10:30:30,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-17 10:30:30,504 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 states have internal predecessors, (34), 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 26 [2021-12-17 10:30:30,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:30:30,506 INFO L225 Difference]: With dead ends: 651 [2021-12-17 10:30:30,506 INFO L226 Difference]: Without dead ends: 629 [2021-12-17 10:30:30,506 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=149, Unknown=0, NotChecked=0, Total=210 [2021-12-17 10:30:30,507 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 61 mSDsluCounter, 175 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 215 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-17 10:30:30,507 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 215 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-17 10:30:30,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 629 states. [2021-12-17 10:30:30,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 629 to 380. [2021-12-17 10:30:30,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 380 states, 379 states have (on average 1.4775725593667546) internal successors, (560), 379 states have internal predecessors, (560), 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) [2021-12-17 10:30:30,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 380 states to 380 states and 560 transitions. [2021-12-17 10:30:30,519 INFO L78 Accepts]: Start accepts. Automaton has 380 states and 560 transitions. Word has length 26 [2021-12-17 10:30:30,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:30:30,519 INFO L470 AbstractCegarLoop]: Abstraction has 380 states and 560 transitions. [2021-12-17 10:30:30,520 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 states have internal predecessors, (34), 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) [2021-12-17 10:30:30,520 INFO L276 IsEmpty]: Start isEmpty. Operand 380 states and 560 transitions. [2021-12-17 10:30:30,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-12-17 10:30:30,520 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:30:30,520 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:30:30,536 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-12-17 10:30:30,731 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:30:30,731 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:30:30,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:30:30,732 INFO L85 PathProgramCache]: Analyzing trace with hash -833380899, now seen corresponding path program 5 times [2021-12-17 10:30:30,732 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:30:30,732 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1056912713] [2021-12-17 10:30:30,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:30:30,732 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:30:30,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:30:30,869 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:30:30,869 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:30:30,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1056912713] [2021-12-17 10:30:30,869 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1056912713] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:30:30,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1393588640] [2021-12-17 10:30:30,869 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-17 10:30:30,869 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:30:30,869 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:30:30,870 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-17 10:30:30,872 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-12-17 10:30:30,949 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-12-17 10:30:30,949 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 10:30:30,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 35 conjunts are in the unsatisfiable core [2021-12-17 10:30:30,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:30:31,022 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:30:31,022 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:30:31,230 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:30:31,230 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1393588640] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:30:31,230 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:30:31,230 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 27 [2021-12-17 10:30:31,231 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1638968116] [2021-12-17 10:30:31,231 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:30:31,231 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-17 10:30:31,231 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:30:31,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-17 10:30:31,232 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=579, Unknown=0, NotChecked=0, Total=702 [2021-12-17 10:30:31,232 INFO L87 Difference]: Start difference. First operand 380 states and 560 transitions. Second operand has 27 states, 27 states have (on average 1.962962962962963) internal successors, (53), 27 states have internal predecessors, (53), 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) [2021-12-17 10:30:50,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:30:50,534 INFO L93 Difference]: Finished difference Result 1277 states and 1884 transitions. [2021-12-17 10:30:50,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 197 states. [2021-12-17 10:30:50,534 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.962962962962963) internal successors, (53), 27 states have internal predecessors, (53), 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 27 [2021-12-17 10:30:50,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:30:50,537 INFO L225 Difference]: With dead ends: 1277 [2021-12-17 10:30:50,537 INFO L226 Difference]: Without dead ends: 1191 [2021-12-17 10:30:50,542 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 205 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17318 ImplicationChecksByTransitivity, 16.7s TimeCoverageRelationStatistics Valid=8385, Invalid=34257, Unknown=0, NotChecked=0, Total=42642 [2021-12-17 10:30:50,543 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 781 mSDsluCounter, 459 mSDsCounter, 0 mSdLazyCounter, 1773 mSolverCounterSat, 1051 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 781 SdHoareTripleChecker+Valid, 491 SdHoareTripleChecker+Invalid, 2824 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1051 IncrementalHoareTripleChecker+Valid, 1773 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2021-12-17 10:30:50,543 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [781 Valid, 491 Invalid, 2824 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1051 Valid, 1773 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2021-12-17 10:30:50,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1191 states. [2021-12-17 10:30:50,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1191 to 487. [2021-12-17 10:30:50,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 487 states, 486 states have (on average 1.4979423868312758) internal successors, (728), 486 states have internal predecessors, (728), 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) [2021-12-17 10:30:50,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 728 transitions. [2021-12-17 10:30:50,559 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 728 transitions. Word has length 27 [2021-12-17 10:30:50,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:30:50,559 INFO L470 AbstractCegarLoop]: Abstraction has 487 states and 728 transitions. [2021-12-17 10:30:50,559 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.962962962962963) internal successors, (53), 27 states have internal predecessors, (53), 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) [2021-12-17 10:30:50,560 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 728 transitions. [2021-12-17 10:30:50,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-17 10:30:50,560 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:30:50,560 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:30:50,579 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-12-17 10:30:50,776 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-12-17 10:30:50,777 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:30:50,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:30:50,777 INFO L85 PathProgramCache]: Analyzing trace with hash 796082573, now seen corresponding path program 6 times [2021-12-17 10:30:50,777 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:30:50,777 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [254115369] [2021-12-17 10:30:50,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:30:50,777 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:30:50,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:30:50,907 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-12-17 10:30:50,907 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:30:50,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [254115369] [2021-12-17 10:30:50,907 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [254115369] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:30:50,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1152788211] [2021-12-17 10:30:50,907 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-17 10:30:50,907 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:30:50,907 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:30:50,908 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-17 10:30:50,909 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-12-17 10:30:50,960 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-12-17 10:30:50,960 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 10:30:50,961 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-17 10:30:50,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:30:51,081 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 10 proven. 25 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-17 10:30:51,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:30:51,121 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 10 proven. 25 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-17 10:30:51,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1152788211] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:30:51,121 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:30:51,121 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 8, 8] total 21 [2021-12-17 10:30:51,121 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1343360537] [2021-12-17 10:30:51,121 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:30:51,121 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-12-17 10:30:51,121 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:30:51,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-12-17 10:30:51,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=376, Unknown=0, NotChecked=0, Total=420 [2021-12-17 10:30:51,122 INFO L87 Difference]: Start difference. First operand 487 states and 728 transitions. Second operand has 21 states, 21 states have (on average 2.0) internal successors, (42), 21 states have internal predecessors, (42), 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) [2021-12-17 10:30:55,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:30:55,839 INFO L93 Difference]: Finished difference Result 1122 states and 1593 transitions. [2021-12-17 10:30:55,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2021-12-17 10:30:55,840 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.0) internal successors, (42), 21 states have internal predecessors, (42), 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 29 [2021-12-17 10:30:55,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:30:55,842 INFO L225 Difference]: With dead ends: 1122 [2021-12-17 10:30:55,842 INFO L226 Difference]: Without dead ends: 1027 [2021-12-17 10:30:55,843 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2930 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=989, Invalid=8517, Unknown=0, NotChecked=0, Total=9506 [2021-12-17 10:30:55,843 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 407 mSDsluCounter, 451 mSDsCounter, 0 mSdLazyCounter, 1507 mSolverCounterSat, 384 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 407 SdHoareTripleChecker+Valid, 501 SdHoareTripleChecker+Invalid, 1891 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 384 IncrementalHoareTripleChecker+Valid, 1507 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-12-17 10:30:55,844 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [407 Valid, 501 Invalid, 1891 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [384 Valid, 1507 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2021-12-17 10:30:55,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1027 states. [2021-12-17 10:30:55,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1027 to 514. [2021-12-17 10:30:55,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 514 states, 513 states have (on average 1.49317738791423) internal successors, (766), 513 states have internal predecessors, (766), 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) [2021-12-17 10:30:55,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 766 transitions. [2021-12-17 10:30:55,861 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 766 transitions. Word has length 29 [2021-12-17 10:30:55,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:30:55,861 INFO L470 AbstractCegarLoop]: Abstraction has 514 states and 766 transitions. [2021-12-17 10:30:55,861 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.0) internal successors, (42), 21 states have internal predecessors, (42), 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) [2021-12-17 10:30:55,861 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 766 transitions. [2021-12-17 10:30:55,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-12-17 10:30:55,862 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:30:55,862 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:30:55,878 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2021-12-17 10:30:56,074 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-12-17 10:30:56,075 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:30:56,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:30:56,075 INFO L85 PathProgramCache]: Analyzing trace with hash -1004492410, now seen corresponding path program 5 times [2021-12-17 10:30:56,075 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:30:56,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [587099143] [2021-12-17 10:30:56,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:30:56,076 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:30:56,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:30:56,406 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-17 10:30:56,406 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:30:56,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [587099143] [2021-12-17 10:30:56,406 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [587099143] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:30:56,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1304941567] [2021-12-17 10:30:56,406 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-17 10:30:56,406 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:30:56,406 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:30:56,407 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-17 10:30:56,408 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-12-17 10:30:56,555 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-12-17 10:30:56,556 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 10:30:56,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 61 conjunts are in the unsatisfiable core [2021-12-17 10:30:56,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:30:57,310 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:30:57,310 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:31:02,509 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:31:02,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1304941567] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:31:02,509 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:31:02,509 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21, 21] total 43 [2021-12-17 10:31:02,509 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197034413] [2021-12-17 10:31:02,509 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:31:02,509 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-12-17 10:31:02,509 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:31:02,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-12-17 10:31:02,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=1623, Unknown=1, NotChecked=0, Total=1806 [2021-12-17 10:31:02,510 INFO L87 Difference]: Start difference. First operand 514 states and 766 transitions. Second operand has 43 states, 43 states have (on average 1.7209302325581395) internal successors, (74), 43 states have internal predecessors, (74), 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) [2021-12-17 10:31:19,349 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-12-17 10:31:29,871 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-12-17 10:32:00,931 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-12-17 10:32:19,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:32:19,726 INFO L93 Difference]: Finished difference Result 1012 states and 1362 transitions. [2021-12-17 10:32:19,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-12-17 10:32:19,726 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.7209302325581395) internal successors, (74), 43 states have internal predecessors, (74), 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 30 [2021-12-17 10:32:19,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:32:19,728 INFO L225 Difference]: With dead ends: 1012 [2021-12-17 10:32:19,728 INFO L226 Difference]: Without dead ends: 895 [2021-12-17 10:32:19,729 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 36 SyntacticMatches, 4 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2632 ImplicationChecksByTransitivity, 67.2s TimeCoverageRelationStatistics Valid=1620, Invalid=10589, Unknown=1, NotChecked=0, Total=12210 [2021-12-17 10:32:19,729 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 341 mSDsluCounter, 486 mSDsCounter, 0 mSdLazyCounter, 1344 mSolverCounterSat, 343 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 15.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 341 SdHoareTripleChecker+Valid, 510 SdHoareTripleChecker+Invalid, 1690 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 343 IncrementalHoareTripleChecker+Valid, 1344 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.5s IncrementalHoareTripleChecker+Time [2021-12-17 10:32:19,730 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [341 Valid, 510 Invalid, 1690 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [343 Valid, 1344 Invalid, 3 Unknown, 0 Unchecked, 15.5s Time] [2021-12-17 10:32:19,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 895 states. [2021-12-17 10:32:19,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 895 to 528. [2021-12-17 10:32:19,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 528 states, 527 states have (on average 1.5028462998102468) internal successors, (792), 527 states have internal predecessors, (792), 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) [2021-12-17 10:32:19,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 528 states to 528 states and 792 transitions. [2021-12-17 10:32:19,748 INFO L78 Accepts]: Start accepts. Automaton has 528 states and 792 transitions. Word has length 30 [2021-12-17 10:32:19,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:32:19,748 INFO L470 AbstractCegarLoop]: Abstraction has 528 states and 792 transitions. [2021-12-17 10:32:19,748 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.7209302325581395) internal successors, (74), 43 states have internal predecessors, (74), 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) [2021-12-17 10:32:19,748 INFO L276 IsEmpty]: Start isEmpty. Operand 528 states and 792 transitions. [2021-12-17 10:32:19,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-12-17 10:32:19,749 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:32:19,749 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:32:19,755 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-12-17 10:32:19,953 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:32:19,953 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:32:19,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:32:19,954 INFO L85 PathProgramCache]: Analyzing trace with hash 1893940903, now seen corresponding path program 7 times [2021-12-17 10:32:19,954 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:32:19,954 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [413847779] [2021-12-17 10:32:19,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:32:19,954 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:32:19,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:32:20,145 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:32:20,145 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:32:20,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [413847779] [2021-12-17 10:32:20,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [413847779] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:32:20,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [456485034] [2021-12-17 10:32:20,146 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-17 10:32:20,146 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:32:20,146 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:32:20,147 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-17 10:32:20,148 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-12-17 10:32:20,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:32:20,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 28 conjunts are in the unsatisfiable core [2021-12-17 10:32:20,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:32:20,326 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-12-17 10:32:20,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:32:20,375 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-12-17 10:32:20,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [456485034] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:32:20,375 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:32:20,375 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 9, 9] total 24 [2021-12-17 10:32:20,375 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286890806] [2021-12-17 10:32:20,375 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:32:20,375 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-12-17 10:32:20,375 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:32:20,375 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-12-17 10:32:20,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2021-12-17 10:32:20,376 INFO L87 Difference]: Start difference. First operand 528 states and 792 transitions. Second operand has 24 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 24 states have internal predecessors, (50), 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) [2021-12-17 10:32:36,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:32:36,016 INFO L93 Difference]: Finished difference Result 1566 states and 2159 transitions. [2021-12-17 10:32:36,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 222 states. [2021-12-17 10:32:36,016 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 24 states have internal predecessors, (50), 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 30 [2021-12-17 10:32:36,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:32:36,019 INFO L225 Difference]: With dead ends: 1566 [2021-12-17 10:32:36,019 INFO L226 Difference]: Without dead ends: 1495 [2021-12-17 10:32:36,022 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 239 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23391 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=3138, Invalid=54702, Unknown=0, NotChecked=0, Total=57840 [2021-12-17 10:32:36,022 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 658 mSDsluCounter, 551 mSDsCounter, 0 mSdLazyCounter, 3336 mSolverCounterSat, 708 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 658 SdHoareTripleChecker+Valid, 591 SdHoareTripleChecker+Invalid, 4044 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 708 IncrementalHoareTripleChecker+Valid, 3336 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-12-17 10:32:36,023 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [658 Valid, 591 Invalid, 4044 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [708 Valid, 3336 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2021-12-17 10:32:36,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1495 states. [2021-12-17 10:32:36,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1495 to 584. [2021-12-17 10:32:36,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 584 states, 583 states have (on average 1.5111492281303602) internal successors, (881), 583 states have internal predecessors, (881), 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) [2021-12-17 10:32:36,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 584 states to 584 states and 881 transitions. [2021-12-17 10:32:36,046 INFO L78 Accepts]: Start accepts. Automaton has 584 states and 881 transitions. Word has length 30 [2021-12-17 10:32:36,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:32:36,046 INFO L470 AbstractCegarLoop]: Abstraction has 584 states and 881 transitions. [2021-12-17 10:32:36,046 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 24 states have internal predecessors, (50), 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) [2021-12-17 10:32:36,046 INFO L276 IsEmpty]: Start isEmpty. Operand 584 states and 881 transitions. [2021-12-17 10:32:36,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-12-17 10:32:36,047 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:32:36,047 INFO L514 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:32:36,069 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2021-12-17 10:32:36,264 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:32:36,264 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:32:36,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:32:36,264 INFO L85 PathProgramCache]: Analyzing trace with hash -1610409754, now seen corresponding path program 6 times [2021-12-17 10:32:36,264 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:32:36,264 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [390495986] [2021-12-17 10:32:36,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:32:36,264 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:32:36,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:32:36,449 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-17 10:32:36,449 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:32:36,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [390495986] [2021-12-17 10:32:36,449 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [390495986] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:32:36,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1039748445] [2021-12-17 10:32:36,450 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-17 10:32:36,450 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:32:36,450 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:32:36,450 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-17 10:32:36,471 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-12-17 10:32:36,567 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-12-17 10:32:36,567 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 10:32:36,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 33 conjunts are in the unsatisfiable core [2021-12-17 10:32:36,569 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:32:36,654 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-17 10:32:36,654 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:32:36,991 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-17 10:32:36,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1039748445] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:32:36,992 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:32:36,992 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 35 [2021-12-17 10:32:36,992 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808818601] [2021-12-17 10:32:36,992 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:32:36,992 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-12-17 10:32:36,992 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:32:36,992 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-12-17 10:32:36,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=921, Unknown=0, NotChecked=0, Total=1190 [2021-12-17 10:32:36,993 INFO L87 Difference]: Start difference. First operand 584 states and 881 transitions. Second operand has 35 states, 35 states have (on average 1.4285714285714286) internal successors, (50), 35 states have internal predecessors, (50), 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) [2021-12-17 10:33:15,612 WARN L227 SmtUtils]: Spent 6.04s on a formula simplification that was a NOOP. DAG size: 61 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-17 10:33:47,291 WARN L227 SmtUtils]: Spent 5.93s on a formula simplification that was a NOOP. DAG size: 62 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-17 10:35:11,813 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.96s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-12-17 10:35:18,553 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.12s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-12-17 10:35:26,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:35:26,019 INFO L93 Difference]: Finished difference Result 1706 states and 2733 transitions. [2021-12-17 10:35:26,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2021-12-17 10:35:26,020 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.4285714285714286) internal successors, (50), 35 states have internal predecessors, (50), 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 30 [2021-12-17 10:35:26,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:35:26,023 INFO L225 Difference]: With dead ends: 1706 [2021-12-17 10:35:26,023 INFO L226 Difference]: Without dead ends: 1507 [2021-12-17 10:35:26,024 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9039 ImplicationChecksByTransitivity, 156.2s TimeCoverageRelationStatistics Valid=6277, Invalid=17285, Unknown=0, NotChecked=0, Total=23562 [2021-12-17 10:35:26,024 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 1627 mSDsluCounter, 997 mSDsCounter, 0 mSdLazyCounter, 1639 mSolverCounterSat, 1775 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1627 SdHoareTripleChecker+Valid, 1069 SdHoareTripleChecker+Invalid, 3414 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1775 IncrementalHoareTripleChecker+Valid, 1639 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.2s IncrementalHoareTripleChecker+Time [2021-12-17 10:35:26,025 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1627 Valid, 1069 Invalid, 3414 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1775 Valid, 1639 Invalid, 0 Unknown, 0 Unchecked, 13.2s Time] [2021-12-17 10:35:26,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1507 states. [2021-12-17 10:35:26,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1507 to 644. [2021-12-17 10:35:26,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 644 states, 643 states have (on average 1.5023328149300155) internal successors, (966), 643 states have internal predecessors, (966), 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) [2021-12-17 10:35:26,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 644 states to 644 states and 966 transitions. [2021-12-17 10:35:26,049 INFO L78 Accepts]: Start accepts. Automaton has 644 states and 966 transitions. Word has length 30 [2021-12-17 10:35:26,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:35:26,050 INFO L470 AbstractCegarLoop]: Abstraction has 644 states and 966 transitions. [2021-12-17 10:35:26,050 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.4285714285714286) internal successors, (50), 35 states have internal predecessors, (50), 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) [2021-12-17 10:35:26,050 INFO L276 IsEmpty]: Start isEmpty. Operand 644 states and 966 transitions. [2021-12-17 10:35:26,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-12-17 10:35:26,051 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:35:26,051 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:35:26,069 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-12-17 10:35:26,266 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:35:26,266 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:35:26,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:35:26,267 INFO L85 PathProgramCache]: Analyzing trace with hash 380203431, now seen corresponding path program 7 times [2021-12-17 10:35:26,267 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:35:26,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [367091134] [2021-12-17 10:35:26,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:35:26,267 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:35:26,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:35:26,346 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-12-17 10:35:26,346 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:35:26,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [367091134] [2021-12-17 10:35:26,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [367091134] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:35:26,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1844452892] [2021-12-17 10:35:26,347 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-17 10:35:26,347 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:35:26,347 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:35:26,348 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-17 10:35:26,351 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-12-17 10:35:26,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:35:26,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-17 10:35:26,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:35:26,466 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-12-17 10:35:26,466 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:35:26,506 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-12-17 10:35:26,506 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1844452892] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:35:26,507 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:35:26,507 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 13 [2021-12-17 10:35:26,507 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [581137090] [2021-12-17 10:35:26,507 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:35:26,507 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-17 10:35:26,507 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:35:26,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-17 10:35:26,507 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2021-12-17 10:35:26,507 INFO L87 Difference]: Start difference. First operand 644 states and 966 transitions. Second operand has 13 states, 13 states have (on average 2.769230769230769) internal successors, (36), 13 states have internal predecessors, (36), 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) [2021-12-17 10:35:26,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:35:26,836 INFO L93 Difference]: Finished difference Result 1509 states and 2209 transitions. [2021-12-17 10:35:26,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-12-17 10:35:26,836 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.769230769230769) internal successors, (36), 13 states have internal predecessors, (36), 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 32 [2021-12-17 10:35:26,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:35:26,839 INFO L225 Difference]: With dead ends: 1509 [2021-12-17 10:35:26,839 INFO L226 Difference]: Without dead ends: 1275 [2021-12-17 10:35:26,840 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=148, Invalid=314, Unknown=0, NotChecked=0, Total=462 [2021-12-17 10:35:26,840 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 218 mSDsluCounter, 193 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 242 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-17 10:35:26,840 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [218 Valid, 242 Invalid, 187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-17 10:35:26,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1275 states. [2021-12-17 10:35:26,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1275 to 709. [2021-12-17 10:35:26,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 709 states, 708 states have (on average 1.4774011299435028) internal successors, (1046), 708 states have internal predecessors, (1046), 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) [2021-12-17 10:35:26,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 709 states to 709 states and 1046 transitions. [2021-12-17 10:35:26,875 INFO L78 Accepts]: Start accepts. Automaton has 709 states and 1046 transitions. Word has length 32 [2021-12-17 10:35:26,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:35:26,875 INFO L470 AbstractCegarLoop]: Abstraction has 709 states and 1046 transitions. [2021-12-17 10:35:26,875 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.769230769230769) internal successors, (36), 13 states have internal predecessors, (36), 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) [2021-12-17 10:35:26,875 INFO L276 IsEmpty]: Start isEmpty. Operand 709 states and 1046 transitions. [2021-12-17 10:35:26,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-12-17 10:35:26,876 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:35:26,876 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:35:26,893 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-12-17 10:35:27,089 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-12-17 10:35:27,089 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:35:27,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:35:27,089 INFO L85 PathProgramCache]: Analyzing trace with hash -404867559, now seen corresponding path program 3 times [2021-12-17 10:35:27,089 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:35:27,089 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2126926003] [2021-12-17 10:35:27,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:35:27,090 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:35:27,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:35:27,202 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-12-17 10:35:27,202 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:35:27,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2126926003] [2021-12-17 10:35:27,202 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2126926003] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:35:27,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [573840142] [2021-12-17 10:35:27,202 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-17 10:35:27,203 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:35:27,203 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:35:27,204 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-17 10:35:27,207 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-12-17 10:35:27,324 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-12-17 10:35:27,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 10:35:27,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-17 10:35:27,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:35:27,416 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-12-17 10:35:27,416 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:35:27,519 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-12-17 10:35:27,519 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [573840142] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:35:27,519 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:35:27,519 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8, 8] total 22 [2021-12-17 10:35:27,520 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988922349] [2021-12-17 10:35:27,520 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:35:27,520 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-12-17 10:35:27,520 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:35:27,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-12-17 10:35:27,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=398, Unknown=0, NotChecked=0, Total=462 [2021-12-17 10:35:27,521 INFO L87 Difference]: Start difference. First operand 709 states and 1046 transitions. Second operand has 22 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 22 states have internal predecessors, (38), 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) [2021-12-17 10:35:29,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:35:29,296 INFO L93 Difference]: Finished difference Result 1017 states and 1427 transitions. [2021-12-17 10:35:29,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-12-17 10:35:29,297 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 22 states have internal predecessors, (38), 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 32 [2021-12-17 10:35:29,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:35:29,299 INFO L225 Difference]: With dead ends: 1017 [2021-12-17 10:35:29,299 INFO L226 Difference]: Without dead ends: 859 [2021-12-17 10:35:29,299 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1189 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=451, Invalid=4519, Unknown=0, NotChecked=0, Total=4970 [2021-12-17 10:35:29,300 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 113 mSDsluCounter, 561 mSDsCounter, 0 mSdLazyCounter, 1565 mSolverCounterSat, 133 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 604 SdHoareTripleChecker+Invalid, 1698 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 133 IncrementalHoareTripleChecker+Valid, 1565 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-17 10:35:29,300 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [113 Valid, 604 Invalid, 1698 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [133 Valid, 1565 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-12-17 10:35:29,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 859 states. [2021-12-17 10:35:29,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 859 to 689. [2021-12-17 10:35:29,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 689 states, 688 states have (on average 1.4607558139534884) internal successors, (1005), 688 states have internal predecessors, (1005), 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) [2021-12-17 10:35:29,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 689 states to 689 states and 1005 transitions. [2021-12-17 10:35:29,324 INFO L78 Accepts]: Start accepts. Automaton has 689 states and 1005 transitions. Word has length 32 [2021-12-17 10:35:29,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:35:29,325 INFO L470 AbstractCegarLoop]: Abstraction has 689 states and 1005 transitions. [2021-12-17 10:35:29,325 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 22 states have internal predecessors, (38), 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) [2021-12-17 10:35:29,325 INFO L276 IsEmpty]: Start isEmpty. Operand 689 states and 1005 transitions. [2021-12-17 10:35:29,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-12-17 10:35:29,326 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:35:29,326 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:35:29,344 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-12-17 10:35:29,541 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-12-17 10:35:29,542 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:35:29,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:35:29,542 INFO L85 PathProgramCache]: Analyzing trace with hash -1111633127, now seen corresponding path program 8 times [2021-12-17 10:35:29,542 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:35:29,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [706698530] [2021-12-17 10:35:29,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:35:29,542 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:35:29,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:35:29,724 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-12-17 10:35:29,724 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:35:29,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [706698530] [2021-12-17 10:35:29,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [706698530] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:35:29,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1172117026] [2021-12-17 10:35:29,724 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-17 10:35:29,724 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:35:29,725 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:35:29,725 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-17 10:35:29,767 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-12-17 10:35:29,776 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-17 10:35:29,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 10:35:29,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 48 conjunts are in the unsatisfiable core [2021-12-17 10:35:29,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:35:30,009 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-12-17 10:35:30,009 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:35:30,426 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-12-17 10:35:30,426 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1172117026] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:35:30,427 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:35:30,427 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 42 [2021-12-17 10:35:30,427 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656711999] [2021-12-17 10:35:30,427 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:35:30,427 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-12-17 10:35:30,427 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:35:30,428 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-12-17 10:35:30,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=289, Invalid=1433, Unknown=0, NotChecked=0, Total=1722 [2021-12-17 10:35:30,428 INFO L87 Difference]: Start difference. First operand 689 states and 1005 transitions. Second operand has 42 states, 42 states have (on average 1.380952380952381) internal successors, (58), 42 states have internal predecessors, (58), 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) [2021-12-17 10:35:49,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:35:49,365 INFO L93 Difference]: Finished difference Result 1595 states and 2237 transitions. [2021-12-17 10:35:49,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 212 states. [2021-12-17 10:35:49,365 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.380952380952381) internal successors, (58), 42 states have internal predecessors, (58), 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 34 [2021-12-17 10:35:49,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:35:49,368 INFO L225 Difference]: With dead ends: 1595 [2021-12-17 10:35:49,368 INFO L226 Difference]: Without dead ends: 1472 [2021-12-17 10:35:49,370 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 210 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16225 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=5209, Invalid=39523, Unknown=0, NotChecked=0, Total=44732 [2021-12-17 10:35:49,371 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 939 mSDsluCounter, 694 mSDsCounter, 0 mSdLazyCounter, 2802 mSolverCounterSat, 1706 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 939 SdHoareTripleChecker+Valid, 747 SdHoareTripleChecker+Invalid, 4508 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1706 IncrementalHoareTripleChecker+Valid, 2802 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2021-12-17 10:35:49,371 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [939 Valid, 747 Invalid, 4508 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1706 Valid, 2802 Invalid, 0 Unknown, 0 Unchecked, 3.5s Time] [2021-12-17 10:35:49,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1472 states. [2021-12-17 10:35:49,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1472 to 924. [2021-12-17 10:35:49,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 924 states, 923 states have (on average 1.4593716143011917) internal successors, (1347), 923 states have internal predecessors, (1347), 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) [2021-12-17 10:35:49,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 924 states to 924 states and 1347 transitions. [2021-12-17 10:35:49,412 INFO L78 Accepts]: Start accepts. Automaton has 924 states and 1347 transitions. Word has length 34 [2021-12-17 10:35:49,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:35:49,412 INFO L470 AbstractCegarLoop]: Abstraction has 924 states and 1347 transitions. [2021-12-17 10:35:49,412 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.380952380952381) internal successors, (58), 42 states have internal predecessors, (58), 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) [2021-12-17 10:35:49,412 INFO L276 IsEmpty]: Start isEmpty. Operand 924 states and 1347 transitions. [2021-12-17 10:35:49,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-12-17 10:35:49,413 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:35:49,413 INFO L514 BasicCegarLoop]: trace histogram [14, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:35:49,431 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-12-17 10:35:49,619 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:35:49,619 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:35:49,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:35:49,619 INFO L85 PathProgramCache]: Analyzing trace with hash -2101731714, now seen corresponding path program 8 times [2021-12-17 10:35:49,620 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:35:49,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [688659334] [2021-12-17 10:35:49,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:35:49,620 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:35:49,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:35:49,818 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-17 10:35:49,818 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:35:49,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [688659334] [2021-12-17 10:35:49,818 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [688659334] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:35:49,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2139989395] [2021-12-17 10:35:49,818 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-17 10:35:49,818 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:35:49,818 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:35:49,819 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-17 10:35:49,820 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-12-17 10:35:49,856 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-17 10:35:49,856 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 10:35:49,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 37 conjunts are in the unsatisfiable core [2021-12-17 10:35:49,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:35:49,945 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-17 10:35:49,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:35:50,366 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-17 10:35:50,366 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2139989395] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:35:50,366 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:35:50,366 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2021-12-17 10:35:50,366 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28470878] [2021-12-17 10:35:50,366 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:35:50,367 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-12-17 10:35:50,367 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:35:50,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-12-17 10:35:50,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=312, Invalid=1170, Unknown=0, NotChecked=0, Total=1482 [2021-12-17 10:35:50,367 INFO L87 Difference]: Start difference. First operand 924 states and 1347 transitions. Second operand has 39 states, 39 states have (on average 1.3846153846153846) internal successors, (54), 39 states have internal predecessors, (54), 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) [2021-12-17 10:36:13,519 WARN L227 SmtUtils]: Spent 8.58s on a formula simplification that was a NOOP. DAG size: 58 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-17 10:36:35,510 WARN L227 SmtUtils]: Spent 13.18s on a formula simplification that was a NOOP. DAG size: 71 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-17 10:36:58,387 WARN L227 SmtUtils]: Spent 10.99s on a formula simplification that was a NOOP. DAG size: 68 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-17 10:37:11,646 WARN L227 SmtUtils]: Spent 8.47s on a formula simplification that was a NOOP. DAG size: 67 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-17 10:37:35,789 WARN L227 SmtUtils]: Spent 9.16s on a formula simplification that was a NOOP. DAG size: 64 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-17 10:37:44,591 WARN L227 SmtUtils]: Spent 6.15s on a formula simplification that was a NOOP. DAG size: 63 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-17 10:37:59,504 WARN L227 SmtUtils]: Spent 7.12s on a formula simplification that was a NOOP. DAG size: 61 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-17 10:38:28,840 WARN L227 SmtUtils]: Spent 7.28s on a formula simplification that was a NOOP. DAG size: 69 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-17 10:38:59,616 WARN L227 SmtUtils]: Spent 5.89s on a formula simplification that was a NOOP. DAG size: 63 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-17 10:39:10,332 WARN L227 SmtUtils]: Spent 6.98s on a formula simplification that was a NOOP. DAG size: 65 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-17 10:39:39,865 WARN L227 SmtUtils]: Spent 5.41s on a formula simplification that was a NOOP. DAG size: 61 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-17 10:41:40,729 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.82s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-12-17 10:42:14,441 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-12-17 10:42:31,725 WARN L227 SmtUtils]: Spent 5.40s on a formula simplification that was a NOOP. DAG size: 66 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-17 10:42:45,464 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.22s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] Killed by 15