./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/loop-simple/deep-nested.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version ff03de63 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/loop-simple/deep-nested.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 abddf9ff39262b7e56b56d5272c2d316261bfefbe98fc5849d87d962ab5f7694 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-ff03de6 [2021-12-21 12:25:16,021 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-21 12:25:16,023 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-21 12:25:16,048 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-21 12:25:16,048 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-21 12:25:16,049 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-21 12:25:16,050 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-21 12:25:16,051 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-21 12:25:16,052 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-21 12:25:16,053 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-21 12:25:16,053 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-21 12:25:16,054 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-21 12:25:16,054 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-21 12:25:16,055 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-21 12:25:16,056 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-21 12:25:16,057 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-21 12:25:16,057 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-21 12:25:16,058 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-21 12:25:16,059 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-21 12:25:16,060 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-21 12:25:16,061 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-21 12:25:16,062 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-21 12:25:16,063 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-21 12:25:16,064 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-21 12:25:16,066 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-21 12:25:16,066 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-21 12:25:16,066 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-21 12:25:16,067 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-21 12:25:16,067 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-21 12:25:16,068 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-21 12:25:16,068 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-21 12:25:16,069 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-21 12:25:16,069 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-21 12:25:16,070 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-21 12:25:16,070 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-21 12:25:16,071 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-21 12:25:16,071 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-21 12:25:16,071 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-21 12:25:16,071 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-21 12:25:16,072 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-21 12:25:16,072 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-21 12:25:16,073 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-21 12:25:16,086 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-21 12:25:16,087 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-21 12:25:16,087 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-21 12:25:16,087 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-21 12:25:16,088 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-21 12:25:16,088 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-21 12:25:16,088 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-21 12:25:16,089 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-21 12:25:16,089 INFO L138 SettingsManager]: * Use SBE=true [2021-12-21 12:25:16,089 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-21 12:25:16,089 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-21 12:25:16,089 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-21 12:25:16,089 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-21 12:25:16,090 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-21 12:25:16,090 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-21 12:25:16,090 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-21 12:25:16,090 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-21 12:25:16,090 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-21 12:25:16,090 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-21 12:25:16,091 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-21 12:25:16,091 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-21 12:25:16,091 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-21 12:25:16,091 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-21 12:25:16,091 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-21 12:25:16,091 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 12:25:16,092 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-21 12:25:16,092 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-21 12:25:16,092 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-21 12:25:16,092 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-21 12:25:16,092 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-21 12:25:16,092 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-21 12:25:16,092 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-21 12:25:16,093 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-21 12:25:16,093 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-21 12:25:16,093 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> abddf9ff39262b7e56b56d5272c2d316261bfefbe98fc5849d87d962ab5f7694 [2021-12-21 12:25:16,262 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-21 12:25:16,291 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-21 12:25:16,293 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-21 12:25:16,294 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-21 12:25:16,294 INFO L275 PluginConnector]: CDTParser initialized [2021-12-21 12:25:16,295 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-simple/deep-nested.c [2021-12-21 12:25:16,345 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/945a99b56/c63c49437804445bb31d92d8fafecab8/FLAG238455f8b [2021-12-21 12:25:16,705 INFO L306 CDTParser]: Found 1 translation units. [2021-12-21 12:25:16,705 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-simple/deep-nested.c [2021-12-21 12:25:16,709 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/945a99b56/c63c49437804445bb31d92d8fafecab8/FLAG238455f8b [2021-12-21 12:25:16,719 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/945a99b56/c63c49437804445bb31d92d8fafecab8 [2021-12-21 12:25:16,721 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-21 12:25:16,722 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-21 12:25:16,724 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-21 12:25:16,724 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-21 12:25:16,726 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-21 12:25:16,727 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 12:25:16" (1/1) ... [2021-12-21 12:25:16,728 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@71a5fba6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:25:16, skipping insertion in model container [2021-12-21 12:25:16,728 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 12:25:16" (1/1) ... [2021-12-21 12:25:16,732 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-21 12:25:16,740 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-21 12:25:16,859 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/loop-simple/deep-nested.c[625,638] [2021-12-21 12:25:16,864 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 12:25:16,869 INFO L203 MainTranslator]: Completed pre-run [2021-12-21 12:25:16,879 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/loop-simple/deep-nested.c[625,638] [2021-12-21 12:25:16,881 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 12:25:16,889 INFO L208 MainTranslator]: Completed translation [2021-12-21 12:25:16,889 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:25:16 WrapperNode [2021-12-21 12:25:16,890 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-21 12:25:16,891 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-21 12:25:16,891 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-21 12:25:16,891 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-21 12:25:16,896 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:25:16" (1/1) ... [2021-12-21 12:25:16,900 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:25:16" (1/1) ... [2021-12-21 12:25:16,916 INFO L137 Inliner]: procedures = 10, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 61 [2021-12-21 12:25:16,917 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-21 12:25:16,918 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-21 12:25:16,918 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-21 12:25:16,918 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-21 12:25:16,923 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:25:16" (1/1) ... [2021-12-21 12:25:16,924 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:25:16" (1/1) ... [2021-12-21 12:25:16,932 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:25:16" (1/1) ... [2021-12-21 12:25:16,933 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:25:16" (1/1) ... [2021-12-21 12:25:16,939 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:25:16" (1/1) ... [2021-12-21 12:25:16,946 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:25:16" (1/1) ... [2021-12-21 12:25:16,948 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:25:16" (1/1) ... [2021-12-21 12:25:16,949 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-21 12:25:16,954 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-21 12:25:16,955 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-21 12:25:16,955 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-21 12:25:16,956 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:25:16" (1/1) ... [2021-12-21 12:25:16,961 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 12:25:16,970 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:25:17,001 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) [2021-12-21 12:25:17,015 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 [2021-12-21 12:25:17,048 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-21 12:25:17,048 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-21 12:25:17,048 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-21 12:25:17,048 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-21 12:25:17,091 INFO L234 CfgBuilder]: Building ICFG [2021-12-21 12:25:17,092 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-21 12:25:17,191 INFO L275 CfgBuilder]: Performing block encoding [2021-12-21 12:25:17,195 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-21 12:25:17,195 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2021-12-21 12:25:17,197 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 12:25:17 BoogieIcfgContainer [2021-12-21 12:25:17,197 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-21 12:25:17,198 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-21 12:25:17,198 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-21 12:25:17,201 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-21 12:25:17,201 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 12:25:16" (1/3) ... [2021-12-21 12:25:17,202 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2dedada5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 12:25:17, skipping insertion in model container [2021-12-21 12:25:17,202 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:25:16" (2/3) ... [2021-12-21 12:25:17,202 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2dedada5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 12:25:17, skipping insertion in model container [2021-12-21 12:25:17,203 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 12:25:17" (3/3) ... [2021-12-21 12:25:17,204 INFO L111 eAbstractionObserver]: Analyzing ICFG deep-nested.c [2021-12-21 12:25:17,207 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-21 12:25:17,207 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-21 12:25:17,266 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-21 12:25:17,284 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 [2021-12-21 12:25:17,284 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-21 12:25:17,293 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 18 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) [2021-12-21 12:25:17,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-12-21 12:25:17,296 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:25:17,296 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:25:17,297 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:25:17,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:25:17,300 INFO L85 PathProgramCache]: Analyzing trace with hash -180366952, now seen corresponding path program 1 times [2021-12-21 12:25:17,306 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:25:17,306 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [530459710] [2021-12-21 12:25:17,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:25:17,307 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:25:17,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:25:17,557 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:25:17,557 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:25:17,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [530459710] [2021-12-21 12:25:17,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [530459710] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:25:17,559 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 12:25:17,559 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-21 12:25:17,560 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [185560775] [2021-12-21 12:25:17,561 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:25:17,564 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-21 12:25:17,565 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:25:17,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-21 12:25:17,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-21 12:25:17,589 INFO L87 Difference]: Start difference. First operand has 19 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 18 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 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 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) [2021-12-21 12:25:17,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:25:17,660 INFO L93 Difference]: Finished difference Result 39 states and 62 transitions. [2021-12-21 12:25:17,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-21 12:25:17,663 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 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 9 [2021-12-21 12:25:17,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:25:17,674 INFO L225 Difference]: With dead ends: 39 [2021-12-21 12:25:17,674 INFO L226 Difference]: Without dead ends: 18 [2021-12-21 12:25:17,678 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-12-21 12:25:17,681 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 21 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:25:17,682 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 20 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:25:17,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-12-21 12:25:17,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2021-12-21 12:25:17,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.3125) internal successors, (21), 16 states have internal predecessors, (21), 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) [2021-12-21 12:25:17,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2021-12-21 12:25:17,709 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 9 [2021-12-21 12:25:17,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:25:17,709 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2021-12-21 12:25:17,709 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 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) [2021-12-21 12:25:17,709 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2021-12-21 12:25:17,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-12-21 12:25:17,710 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:25:17,710 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:25:17,710 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-21 12:25:17,711 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:25:17,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:25:17,715 INFO L85 PathProgramCache]: Analyzing trace with hash -303894894, now seen corresponding path program 1 times [2021-12-21 12:25:17,715 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:25:17,715 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2075203848] [2021-12-21 12:25:17,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:25:17,716 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:25:17,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:25:17,942 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-21 12:25:17,942 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:25:17,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2075203848] [2021-12-21 12:25:17,943 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2075203848] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:25:17,943 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 12:25:17,943 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-21 12:25:17,943 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524292958] [2021-12-21 12:25:17,943 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:25:17,944 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-21 12:25:17,945 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:25:17,945 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-21 12:25:17,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-21 12:25:17,945 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 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) [2021-12-21 12:25:17,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:25:17,974 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2021-12-21 12:25:17,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-21 12:25:17,975 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 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 [2021-12-21 12:25:17,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:25:17,976 INFO L225 Difference]: With dead ends: 32 [2021-12-21 12:25:17,976 INFO L226 Difference]: Without dead ends: 30 [2021-12-21 12:25:17,976 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 2 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-21 12:25:17,977 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 7 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:25:17,977 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 14 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:25:17,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-12-21 12:25:17,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2021-12-21 12:25:17,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.3333333333333333) internal successors, (36), 27 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) [2021-12-21 12:25:17,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 36 transitions. [2021-12-21 12:25:17,982 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 36 transitions. Word has length 12 [2021-12-21 12:25:17,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:25:17,983 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 36 transitions. [2021-12-21 12:25:17,983 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 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) [2021-12-21 12:25:17,983 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 36 transitions. [2021-12-21 12:25:17,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-12-21 12:25:17,984 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:25:17,984 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:25:17,984 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-21 12:25:17,984 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:25:17,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:25:17,985 INFO L85 PathProgramCache]: Analyzing trace with hash 1056396073, now seen corresponding path program 1 times [2021-12-21 12:25:17,985 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:25:17,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [96379945] [2021-12-21 12:25:17,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:25:17,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:25:17,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:25:18,084 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 12:25:18,084 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:25:18,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [96379945] [2021-12-21 12:25:18,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [96379945] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:25:18,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1054955799] [2021-12-21 12:25:18,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:25:18,085 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:25:18,085 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:25:18,086 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) [2021-12-21 12:25:18,087 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-21 12:25:18,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:25:18,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-21 12:25:18,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:25:18,168 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-21 12:25:18,169 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 12:25:18,169 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1054955799] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:25:18,169 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:25:18,169 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-12-21 12:25:18,170 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702550176] [2021-12-21 12:25:18,170 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:25:18,170 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-21 12:25:18,170 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:25:18,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-21 12:25:18,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-12-21 12:25:18,171 INFO L87 Difference]: Start difference. First operand 28 states and 36 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 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) [2021-12-21 12:25:18,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:25:18,217 INFO L93 Difference]: Finished difference Result 67 states and 87 transitions. [2021-12-21 12:25:18,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-21 12:25:18,217 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 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 [2021-12-21 12:25:18,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:25:18,218 INFO L225 Difference]: With dead ends: 67 [2021-12-21 12:25:18,218 INFO L226 Difference]: Without dead ends: 52 [2021-12-21 12:25:18,219 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-12-21 12:25:18,219 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 49 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:25:18,220 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 18 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:25:18,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-12-21 12:25:18,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 30. [2021-12-21 12:25:18,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 29 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) [2021-12-21 12:25:18,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 38 transitions. [2021-12-21 12:25:18,225 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 38 transitions. Word has length 15 [2021-12-21 12:25:18,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:25:18,226 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 38 transitions. [2021-12-21 12:25:18,226 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 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) [2021-12-21 12:25:18,226 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 38 transitions. [2021-12-21 12:25:18,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-12-21 12:25:18,226 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:25:18,227 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:25:18,245 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-12-21 12:25:18,446 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 [2021-12-21 12:25:18,446 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:25:18,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:25:18,447 INFO L85 PathProgramCache]: Analyzing trace with hash -1212980556, now seen corresponding path program 1 times [2021-12-21 12:25:18,447 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:25:18,448 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [117249345] [2021-12-21 12:25:18,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:25:18,448 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:25:18,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:25:18,591 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-21 12:25:18,591 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:25:18,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [117249345] [2021-12-21 12:25:18,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [117249345] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:25:18,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1449100980] [2021-12-21 12:25:18,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:25:18,592 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:25:18,594 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:25:18,609 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) [2021-12-21 12:25:18,611 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-21 12:25:18,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:25:18,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-21 12:25:18,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:25:18,698 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 12:25:18,699 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 12:25:18,699 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1449100980] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:25:18,699 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:25:18,700 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-12-21 12:25:18,700 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [46131145] [2021-12-21 12:25:18,700 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:25:18,700 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 12:25:18,701 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:25:18,701 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 12:25:18,701 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-12-21 12:25:18,702 INFO L87 Difference]: Start difference. First operand 30 states and 38 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 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) [2021-12-21 12:25:18,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:25:18,757 INFO L93 Difference]: Finished difference Result 76 states and 98 transitions. [2021-12-21 12:25:18,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-21 12:25:18,757 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 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 [2021-12-21 12:25:18,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:25:18,758 INFO L225 Difference]: With dead ends: 76 [2021-12-21 12:25:18,758 INFO L226 Difference]: Without dead ends: 50 [2021-12-21 12:25:18,759 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-12-21 12:25:18,760 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 88 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:25:18,760 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 16 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:25:18,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-12-21 12:25:18,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 32. [2021-12-21 12:25:18,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 31 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) [2021-12-21 12:25:18,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2021-12-21 12:25:18,767 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 18 [2021-12-21 12:25:18,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:25:18,767 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2021-12-21 12:25:18,767 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 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) [2021-12-21 12:25:18,767 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2021-12-21 12:25:18,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-12-21 12:25:18,768 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:25:18,768 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:25:18,811 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-12-21 12:25:18,983 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 [2021-12-21 12:25:18,984 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:25:18,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:25:18,985 INFO L85 PathProgramCache]: Analyzing trace with hash 1901462963, now seen corresponding path program 1 times [2021-12-21 12:25:18,985 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:25:18,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1734723863] [2021-12-21 12:25:18,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:25:18,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:25:19,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:25:19,104 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 12:25:19,105 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:25:19,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1734723863] [2021-12-21 12:25:19,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1734723863] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:25:19,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1467592000] [2021-12-21 12:25:19,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:25:19,105 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:25:19,106 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:25:19,107 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) [2021-12-21 12:25:19,108 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-21 12:25:19,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:25:19,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-21 12:25:19,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:25:19,185 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-21 12:25:19,185 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 12:25:19,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1467592000] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:25:19,186 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:25:19,186 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-12-21 12:25:19,186 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1840639460] [2021-12-21 12:25:19,186 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:25:19,187 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 12:25:19,187 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:25:19,187 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 12:25:19,187 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-12-21 12:25:19,188 INFO L87 Difference]: Start difference. First operand 32 states and 40 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) [2021-12-21 12:25:19,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:25:19,241 INFO L93 Difference]: Finished difference Result 76 states and 96 transitions. [2021-12-21 12:25:19,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-21 12:25:19,241 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 21 [2021-12-21 12:25:19,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:25:19,242 INFO L225 Difference]: With dead ends: 76 [2021-12-21 12:25:19,242 INFO L226 Difference]: Without dead ends: 48 [2021-12-21 12:25:19,242 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-12-21 12:25:19,243 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 59 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:25:19,243 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 17 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:25:19,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-12-21 12:25:19,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 34. [2021-12-21 12:25:19,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 1.2727272727272727) internal successors, (42), 33 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) [2021-12-21 12:25:19,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2021-12-21 12:25:19,248 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 21 [2021-12-21 12:25:19,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:25:19,249 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2021-12-21 12:25:19,249 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) [2021-12-21 12:25:19,249 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2021-12-21 12:25:19,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-12-21 12:25:19,249 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:25:19,250 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:25:19,287 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-21 12:25:19,466 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 [2021-12-21 12:25:19,467 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:25:19,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:25:19,468 INFO L85 PathProgramCache]: Analyzing trace with hash -1208008852, now seen corresponding path program 1 times [2021-12-21 12:25:19,468 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:25:19,468 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [737382551] [2021-12-21 12:25:19,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:25:19,468 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:25:19,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:25:19,585 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-21 12:25:19,586 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:25:19,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [737382551] [2021-12-21 12:25:19,586 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [737382551] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:25:19,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1691523769] [2021-12-21 12:25:19,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:25:19,586 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:25:19,586 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:25:19,612 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) [2021-12-21 12:25:19,613 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-21 12:25:19,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:25:19,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-21 12:25:19,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:25:19,754 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-21 12:25:19,754 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:25:19,890 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-21 12:25:19,890 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1691523769] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:25:19,890 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:25:19,891 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 17 [2021-12-21 12:25:19,891 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715914908] [2021-12-21 12:25:19,891 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:25:19,892 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-21 12:25:19,892 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:25:19,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-21 12:25:19,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-12-21 12:25:19,893 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand has 17 states, 17 states have (on average 4.0) internal successors, (68), 17 states have internal predecessors, (68), 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) [2021-12-21 12:25:21,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:25:21,215 INFO L93 Difference]: Finished difference Result 186 states and 243 transitions. [2021-12-21 12:25:21,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-12-21 12:25:21,215 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 4.0) internal successors, (68), 17 states have internal predecessors, (68), 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 [2021-12-21 12:25:21,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:25:21,216 INFO L225 Difference]: With dead ends: 186 [2021-12-21 12:25:21,216 INFO L226 Difference]: Without dead ends: 111 [2021-12-21 12:25:21,217 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 611 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=509, Invalid=1843, Unknown=0, NotChecked=0, Total=2352 [2021-12-21 12:25:21,218 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 530 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 276 mSolverCounterSat, 151 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 530 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 427 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 151 IncrementalHoareTripleChecker+Valid, 276 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-21 12:25:21,218 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [530 Valid, 64 Invalid, 427 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [151 Valid, 276 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-21 12:25:21,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-12-21 12:25:21,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 71. [2021-12-21 12:25:21,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.2285714285714286) internal successors, (86), 70 states have internal predecessors, (86), 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) [2021-12-21 12:25:21,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 86 transitions. [2021-12-21 12:25:21,233 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 86 transitions. Word has length 27 [2021-12-21 12:25:21,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:25:21,233 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 86 transitions. [2021-12-21 12:25:21,233 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 4.0) internal successors, (68), 17 states have internal predecessors, (68), 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) [2021-12-21 12:25:21,234 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 86 transitions. [2021-12-21 12:25:21,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-12-21 12:25:21,234 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:25:21,235 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-12-21 12:25:21,257 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-21 12:25:21,451 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 [2021-12-21 12:25:21,451 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:25:21,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:25:21,452 INFO L85 PathProgramCache]: Analyzing trace with hash -971666175, now seen corresponding path program 2 times [2021-12-21 12:25:21,452 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:25:21,452 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1654943960] [2021-12-21 12:25:21,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:25:21,452 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:25:21,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:25:21,646 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 12 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-12-21 12:25:21,647 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:25:21,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1654943960] [2021-12-21 12:25:21,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1654943960] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:25:21,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1159494326] [2021-12-21 12:25:21,648 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:25:21,648 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:25:21,648 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:25:21,649 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) [2021-12-21 12:25:21,650 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-21 12:25:21,683 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-12-21 12:25:21,683 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:25:21,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-21 12:25:21,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:25:21,807 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 49 proven. 0 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2021-12-21 12:25:21,807 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 12:25:21,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1159494326] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:25:21,808 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:25:21,808 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [8] total 10 [2021-12-21 12:25:21,808 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827017314] [2021-12-21 12:25:21,808 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:25:21,809 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-21 12:25:21,809 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:25:21,809 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-21 12:25:21,809 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-12-21 12:25:21,809 INFO L87 Difference]: Start difference. First operand 71 states and 86 transitions. Second operand has 4 states, 4 states have (on average 6.5) internal successors, (26), 4 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) [2021-12-21 12:25:21,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:25:21,840 INFO L93 Difference]: Finished difference Result 73 states and 87 transitions. [2021-12-21 12:25:21,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-21 12:25:21,842 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 4 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 48 [2021-12-21 12:25:21,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:25:21,843 INFO L225 Difference]: With dead ends: 73 [2021-12-21 12:25:21,843 INFO L226 Difference]: Without dead ends: 71 [2021-12-21 12:25:21,843 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-12-21 12:25:21,844 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 7 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:25:21,844 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 14 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:25:21,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-12-21 12:25:21,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2021-12-21 12:25:21,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 states have internal predecessors, (84), 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) [2021-12-21 12:25:21,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-12-21 12:25:21,855 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 48 [2021-12-21 12:25:21,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:25:21,855 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-12-21 12:25:21,856 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 4 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) [2021-12-21 12:25:21,856 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-12-21 12:25:21,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-12-21 12:25:21,856 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:25:21,857 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2021-12-21 12:25:21,880 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-21 12:25:22,078 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 [2021-12-21 12:25:22,078 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:25:22,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:25:22,079 INFO L85 PathProgramCache]: Analyzing trace with hash -414140084, now seen corresponding path program 3 times [2021-12-21 12:25:22,079 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:25:22,079 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1784578228] [2021-12-21 12:25:22,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:25:22,079 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:25:22,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:25:22,236 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 17 proven. 64 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2021-12-21 12:25:22,236 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:25:22,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1784578228] [2021-12-21 12:25:22,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1784578228] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:25:22,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [869031161] [2021-12-21 12:25:22,237 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 12:25:22,237 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:25:22,238 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:25:22,238 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) [2021-12-21 12:25:22,240 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-21 12:25:22,266 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2021-12-21 12:25:22,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:25:22,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-21 12:25:22,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:25:22,401 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 69 proven. 0 refuted. 0 times theorem prover too weak. 123 trivial. 0 not checked. [2021-12-21 12:25:22,401 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 12:25:22,401 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [869031161] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:25:22,401 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:25:22,401 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [8] total 10 [2021-12-21 12:25:22,402 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1116682676] [2021-12-21 12:25:22,402 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:25:22,402 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-21 12:25:22,402 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:25:22,403 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-21 12:25:22,403 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-12-21 12:25:22,419 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 4 states, 4 states have (on average 6.25) internal successors, (25), 4 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) [2021-12-21 12:25:22,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:25:22,454 INFO L93 Difference]: Finished difference Result 117 states and 139 transitions. [2021-12-21 12:25:22,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-21 12:25:22,454 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.25) internal successors, (25), 4 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 63 [2021-12-21 12:25:22,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:25:22,455 INFO L225 Difference]: With dead ends: 117 [2021-12-21 12:25:22,455 INFO L226 Difference]: Without dead ends: 115 [2021-12-21 12:25:22,456 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-12-21 12:25:22,456 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 5 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:25:22,456 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 13 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:25:22,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-12-21 12:25:22,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 80. [2021-12-21 12:25:22,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 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) [2021-12-21 12:25:22,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2021-12-21 12:25:22,468 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 63 [2021-12-21 12:25:22,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:25:22,468 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2021-12-21 12:25:22,468 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.25) internal successors, (25), 4 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) [2021-12-21 12:25:22,468 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2021-12-21 12:25:22,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-12-21 12:25:22,469 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:25:22,469 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 5, 5, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2021-12-21 12:25:22,488 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-21 12:25:22,686 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 [2021-12-21 12:25:22,686 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:25:22,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:25:22,687 INFO L85 PathProgramCache]: Analyzing trace with hash 1648728410, now seen corresponding path program 4 times [2021-12-21 12:25:22,687 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:25:22,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [85157710] [2021-12-21 12:25:22,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:25:22,687 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:25:22,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:25:22,855 INFO L134 CoverageAnalysis]: Checked inductivity of 295 backedges. 20 proven. 83 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2021-12-21 12:25:22,856 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:25:22,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [85157710] [2021-12-21 12:25:22,856 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [85157710] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:25:22,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [303770764] [2021-12-21 12:25:22,856 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 12:25:22,856 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:25:22,857 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:25:22,861 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) [2021-12-21 12:25:22,862 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-21 12:25:22,900 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 12:25:22,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:25:22,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-21 12:25:22,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:25:23,107 INFO L134 CoverageAnalysis]: Checked inductivity of 295 backedges. 88 proven. 71 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-12-21 12:25:23,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:25:23,323 INFO L134 CoverageAnalysis]: Checked inductivity of 295 backedges. 30 proven. 129 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-12-21 12:25:23,324 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [303770764] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:25:23,324 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:25:23,324 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 21 [2021-12-21 12:25:23,324 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268209427] [2021-12-21 12:25:23,324 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:25:23,324 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-12-21 12:25:23,325 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:25:23,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-12-21 12:25:23,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=344, Unknown=0, NotChecked=0, Total=420 [2021-12-21 12:25:23,325 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 21 states, 21 states have (on average 3.9523809523809526) internal successors, (83), 21 states have internal predecessors, (83), 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) [2021-12-21 12:25:23,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:25:23,658 INFO L93 Difference]: Finished difference Result 251 states and 317 transitions. [2021-12-21 12:25:23,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-21 12:25:23,658 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.9523809523809526) internal successors, (83), 21 states have internal predecessors, (83), 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 75 [2021-12-21 12:25:23,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:25:23,659 INFO L225 Difference]: With dead ends: 251 [2021-12-21 12:25:23,659 INFO L226 Difference]: Without dead ends: 120 [2021-12-21 12:25:23,660 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 177 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=158, Invalid=712, Unknown=0, NotChecked=0, Total=870 [2021-12-21 12:25:23,660 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 121 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 276 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 276 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 12:25:23,660 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [121 Valid, 75 Invalid, 305 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 276 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 12:25:23,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-12-21 12:25:23,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 110. [2021-12-21 12:25:23,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 109 states have (on average 1.1559633027522935) internal successors, (126), 109 states have internal predecessors, (126), 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) [2021-12-21 12:25:23,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 126 transitions. [2021-12-21 12:25:23,689 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 126 transitions. Word has length 75 [2021-12-21 12:25:23,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:25:23,689 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 126 transitions. [2021-12-21 12:25:23,689 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 3.9523809523809526) internal successors, (83), 21 states have internal predecessors, (83), 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) [2021-12-21 12:25:23,689 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 126 transitions. [2021-12-21 12:25:23,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-12-21 12:25:23,690 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:25:23,690 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 5, 5, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2021-12-21 12:25:23,726 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-12-21 12:25:23,908 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 [2021-12-21 12:25:23,908 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:25:23,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:25:23,908 INFO L85 PathProgramCache]: Analyzing trace with hash 1372721946, now seen corresponding path program 5 times [2021-12-21 12:25:23,909 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:25:23,909 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [727821328] [2021-12-21 12:25:23,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:25:23,909 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:25:23,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:25:24,129 INFO L134 CoverageAnalysis]: Checked inductivity of 790 backedges. 20 proven. 270 refuted. 0 times theorem prover too weak. 500 trivial. 0 not checked. [2021-12-21 12:25:24,130 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:25:24,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [727821328] [2021-12-21 12:25:24,130 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [727821328] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:25:24,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [814137328] [2021-12-21 12:25:24,130 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 12:25:24,130 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:25:24,131 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:25:24,144 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) [2021-12-21 12:25:24,144 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-21 12:25:24,549 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 11 check-sat command(s) [2021-12-21 12:25:24,550 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:25:24,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-21 12:25:24,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:25:24,738 INFO L134 CoverageAnalysis]: Checked inductivity of 790 backedges. 438 proven. 84 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2021-12-21 12:25:24,738 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:25:24,951 INFO L134 CoverageAnalysis]: Checked inductivity of 790 backedges. 420 proven. 102 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2021-12-21 12:25:24,951 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [814137328] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:25:24,951 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:25:24,951 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7, 7] total 19 [2021-12-21 12:25:24,951 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [931132590] [2021-12-21 12:25:24,952 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:25:24,952 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-12-21 12:25:24,952 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:25:24,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-12-21 12:25:24,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2021-12-21 12:25:24,953 INFO L87 Difference]: Start difference. First operand 110 states and 126 transitions. Second operand has 19 states, 19 states have (on average 4.947368421052632) internal successors, (94), 19 states have internal predecessors, (94), 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) [2021-12-21 12:25:25,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:25:25,965 INFO L93 Difference]: Finished difference Result 514 states and 609 transitions. [2021-12-21 12:25:25,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-12-21 12:25:25,966 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 4.947368421052632) internal successors, (94), 19 states have internal predecessors, (94), 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 105 [2021-12-21 12:25:25,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:25:25,967 INFO L225 Difference]: With dead ends: 514 [2021-12-21 12:25:25,967 INFO L226 Difference]: Without dead ends: 330 [2021-12-21 12:25:25,968 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 203 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 423 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=308, Invalid=1584, Unknown=0, NotChecked=0, Total=1892 [2021-12-21 12:25:25,969 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 282 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 433 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 282 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 537 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 433 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-21 12:25:25,969 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [282 Valid, 65 Invalid, 537 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 433 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-21 12:25:25,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 330 states. [2021-12-21 12:25:26,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 330 to 231. [2021-12-21 12:25:26,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 231 states, 230 states have (on average 1.1) internal successors, (253), 230 states have internal predecessors, (253), 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) [2021-12-21 12:25:26,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 253 transitions. [2021-12-21 12:25:26,001 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 253 transitions. Word has length 105 [2021-12-21 12:25:26,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:25:26,002 INFO L470 AbstractCegarLoop]: Abstraction has 231 states and 253 transitions. [2021-12-21 12:25:26,002 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 4.947368421052632) internal successors, (94), 19 states have internal predecessors, (94), 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) [2021-12-21 12:25:26,002 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 253 transitions. [2021-12-21 12:25:26,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2021-12-21 12:25:26,004 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:25:26,005 INFO L514 BasicCegarLoop]: trace histogram [56, 55, 55, 11, 10, 10, 5, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2021-12-21 12:25:26,011 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-12-21 12:25:26,209 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 [2021-12-21 12:25:26,210 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:25:26,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:25:26,210 INFO L85 PathProgramCache]: Analyzing trace with hash -1843530466, now seen corresponding path program 6 times [2021-12-21 12:25:26,210 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:25:26,211 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [360675294] [2021-12-21 12:25:26,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:25:26,211 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:25:26,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:25:26,625 INFO L134 CoverageAnalysis]: Checked inductivity of 5368 backedges. 26 proven. 950 refuted. 0 times theorem prover too weak. 4392 trivial. 0 not checked. [2021-12-21 12:25:26,626 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:25:26,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [360675294] [2021-12-21 12:25:26,626 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [360675294] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:25:26,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1613764155] [2021-12-21 12:25:26,626 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-21 12:25:26,626 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:25:26,626 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:25:26,627 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) [2021-12-21 12:25:26,655 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-21 12:25:26,696 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-12-21 12:25:26,696 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:25:26,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-21 12:25:26,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:25:27,175 INFO L134 CoverageAnalysis]: Checked inductivity of 5368 backedges. 2703 proven. 540 refuted. 0 times theorem prover too weak. 2125 trivial. 0 not checked. [2021-12-21 12:25:27,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:25:27,603 INFO L134 CoverageAnalysis]: Checked inductivity of 5368 backedges. 0 proven. 3243 refuted. 0 times theorem prover too weak. 2125 trivial. 0 not checked. [2021-12-21 12:25:27,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1613764155] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:25:27,603 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:25:27,603 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 5, 5] total 17 [2021-12-21 12:25:27,603 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2057336582] [2021-12-21 12:25:27,604 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:25:27,604 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-21 12:25:27,604 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:25:27,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-21 12:25:27,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2021-12-21 12:25:27,605 INFO L87 Difference]: Start difference. First operand 231 states and 253 transitions. Second operand has 17 states, 17 states have (on average 6.352941176470588) internal successors, (108), 17 states have internal predecessors, (108), 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) [2021-12-21 12:25:29,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:25:29,009 INFO L93 Difference]: Finished difference Result 1439 states and 1642 transitions. [2021-12-21 12:25:29,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-12-21 12:25:29,010 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 6.352941176470588) internal successors, (108), 17 states have internal predecessors, (108), 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 228 [2021-12-21 12:25:29,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:25:29,013 INFO L225 Difference]: With dead ends: 1439 [2021-12-21 12:25:29,013 INFO L226 Difference]: Without dead ends: 1213 [2021-12-21 12:25:29,014 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 451 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 797 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=705, Invalid=2265, Unknown=0, NotChecked=0, Total=2970 [2021-12-21 12:25:29,015 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 265 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 396 mSolverCounterSat, 117 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 265 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 513 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 117 IncrementalHoareTripleChecker+Valid, 396 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-21 12:25:29,015 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [265 Valid, 49 Invalid, 513 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [117 Valid, 396 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-21 12:25:29,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1213 states. [2021-12-21 12:25:29,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1213 to 603. [2021-12-21 12:25:29,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 603 states, 602 states have (on average 1.0714285714285714) internal successors, (645), 602 states have internal predecessors, (645), 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) [2021-12-21 12:25:29,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 603 states to 603 states and 645 transitions. [2021-12-21 12:25:29,072 INFO L78 Accepts]: Start accepts. Automaton has 603 states and 645 transitions. Word has length 228 [2021-12-21 12:25:29,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:25:29,072 INFO L470 AbstractCegarLoop]: Abstraction has 603 states and 645 transitions. [2021-12-21 12:25:29,072 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 6.352941176470588) internal successors, (108), 17 states have internal predecessors, (108), 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) [2021-12-21 12:25:29,073 INFO L276 IsEmpty]: Start isEmpty. Operand 603 states and 645 transitions. [2021-12-21 12:25:29,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 601 [2021-12-21 12:25:29,078 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:25:29,079 INFO L514 BasicCegarLoop]: trace histogram [162, 161, 161, 23, 22, 22, 11, 10, 10, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2021-12-21 12:25:29,095 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-12-21 12:25:29,293 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 [2021-12-21 12:25:29,293 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:25:29,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:25:29,293 INFO L85 PathProgramCache]: Analyzing trace with hash 265720766, now seen corresponding path program 7 times [2021-12-21 12:25:29,293 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:25:29,293 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [776977012] [2021-12-21 12:25:29,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:25:29,294 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:25:29,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:25:30,308 INFO L134 CoverageAnalysis]: Checked inductivity of 43666 backedges. 50 proven. 3795 refuted. 0 times theorem prover too weak. 39821 trivial. 0 not checked. [2021-12-21 12:25:30,308 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:25:30,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [776977012] [2021-12-21 12:25:30,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [776977012] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:25:30,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [38867540] [2021-12-21 12:25:30,309 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-21 12:25:30,309 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:25:30,309 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:25:30,324 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) [2021-12-21 12:25:30,369 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-21 12:25:30,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:25:30,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 913 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-21 12:25:30,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:25:31,244 INFO L134 CoverageAnalysis]: Checked inductivity of 43666 backedges. 6966 proven. 206 refuted. 0 times theorem prover too weak. 36494 trivial. 0 not checked. [2021-12-21 12:25:31,244 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:25:32,115 INFO L134 CoverageAnalysis]: Checked inductivity of 43666 backedges. 6966 proven. 206 refuted. 0 times theorem prover too weak. 36494 trivial. 0 not checked. [2021-12-21 12:25:32,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [38867540] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:25:32,115 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:25:32,116 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9, 9] total 27 [2021-12-21 12:25:32,116 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781943269] [2021-12-21 12:25:32,116 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:25:32,117 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-21 12:25:32,117 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:25:32,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-21 12:25:32,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2021-12-21 12:25:32,117 INFO L87 Difference]: Start difference. First operand 603 states and 645 transitions. Second operand has 27 states, 27 states have (on average 3.962962962962963) internal successors, (107), 27 states have internal predecessors, (107), 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) [2021-12-21 12:25:38,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:25:38,248 INFO L93 Difference]: Finished difference Result 2937 states and 3339 transitions. [2021-12-21 12:25:38,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-12-21 12:25:38,248 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.962962962962963) internal successors, (107), 27 states have internal predecessors, (107), 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 600 [2021-12-21 12:25:38,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:25:38,254 INFO L225 Difference]: With dead ends: 2937 [2021-12-21 12:25:38,254 INFO L226 Difference]: Without dead ends: 2362 [2021-12-21 12:25:38,258 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1287 GetRequests, 1187 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3302 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=1583, Invalid=8719, Unknown=0, NotChecked=0, Total=10302 [2021-12-21 12:25:38,258 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 649 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 1065 mSolverCounterSat, 340 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 649 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 1405 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 340 IncrementalHoareTripleChecker+Valid, 1065 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:25:38,258 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [649 Valid, 61 Invalid, 1405 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [340 Valid, 1065 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-12-21 12:25:38,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2362 states. [2021-12-21 12:25:38,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2362 to 2132. [2021-12-21 12:25:38,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2132 states, 2131 states have (on average 1.040356640075082) internal successors, (2217), 2131 states have internal predecessors, (2217), 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) [2021-12-21 12:25:38,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2132 states to 2132 states and 2217 transitions. [2021-12-21 12:25:38,467 INFO L78 Accepts]: Start accepts. Automaton has 2132 states and 2217 transitions. Word has length 600 [2021-12-21 12:25:38,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:25:38,468 INFO L470 AbstractCegarLoop]: Abstraction has 2132 states and 2217 transitions. [2021-12-21 12:25:38,468 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 3.962962962962963) internal successors, (107), 27 states have internal predecessors, (107), 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) [2021-12-21 12:25:38,468 INFO L276 IsEmpty]: Start isEmpty. Operand 2132 states and 2217 transitions. [2021-12-21 12:25:38,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2128 [2021-12-21 12:25:38,509 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:25:38,510 INFO L514 BasicCegarLoop]: trace histogram [628, 627, 627, 66, 65, 65, 11, 10, 10, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2021-12-21 12:25:38,533 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-12-21 12:25:38,730 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 [2021-12-21 12:25:38,730 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:25:38,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:25:38,731 INFO L85 PathProgramCache]: Analyzing trace with hash 306642997, now seen corresponding path program 8 times [2021-12-21 12:25:38,731 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:25:38,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [610838093] [2021-12-21 12:25:38,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:25:38,731 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:25:42,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:25:43,700 INFO L134 CoverageAnalysis]: Checked inductivity of 637987 backedges. 93 proven. 20614 refuted. 0 times theorem prover too weak. 617280 trivial. 0 not checked. [2021-12-21 12:25:43,700 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:25:43,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [610838093] [2021-12-21 12:25:43,701 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [610838093] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:25:43,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [653566223] [2021-12-21 12:25:43,701 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:25:43,701 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:25:43,701 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:25:43,702 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) [2021-12-21 12:25:43,704 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-12-21 12:25:44,307 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:25:44,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:25:44,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 3035 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-21 12:25:44,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:25:48,037 INFO L134 CoverageAnalysis]: Checked inductivity of 637987 backedges. 190084 proven. 10961 refuted. 0 times theorem prover too weak. 436942 trivial. 0 not checked. [2021-12-21 12:25:48,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:25:51,512 INFO L134 CoverageAnalysis]: Checked inductivity of 637987 backedges. 190078 proven. 10967 refuted. 0 times theorem prover too weak. 436942 trivial. 0 not checked. [2021-12-21 12:25:51,512 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [653566223] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:25:51,513 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:25:51,513 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 9, 9] total 30 [2021-12-21 12:25:51,513 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685980709] [2021-12-21 12:25:51,514 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:25:51,515 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-12-21 12:25:51,517 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:25:51,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-12-21 12:25:51,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=771, Unknown=0, NotChecked=0, Total=870 [2021-12-21 12:25:51,518 INFO L87 Difference]: Start difference. First operand 2132 states and 2217 transitions. Second operand has 30 states, 30 states have (on average 4.3) internal successors, (129), 30 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) [2021-12-21 12:26:00,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:26:00,449 INFO L93 Difference]: Finished difference Result 8560 states and 9365 transitions. [2021-12-21 12:26:00,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-12-21 12:26:00,450 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 4.3) internal successors, (129), 30 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) Word has length 2127 [2021-12-21 12:26:00,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:26:00,466 INFO L225 Difference]: With dead ends: 8560 [2021-12-21 12:26:00,467 INFO L226 Difference]: Without dead ends: 6465 [2021-12-21 12:26:00,472 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4362 GetRequests, 4241 SyntacticMatches, 0 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4937 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=2057, Invalid=12949, Unknown=0, NotChecked=0, Total=15006 [2021-12-21 12:26:00,474 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 842 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 2094 mSolverCounterSat, 393 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 842 SdHoareTripleChecker+Valid, 142 SdHoareTripleChecker+Invalid, 2487 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 393 IncrementalHoareTripleChecker+Valid, 2094 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-12-21 12:26:00,474 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [842 Valid, 142 Invalid, 2487 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [393 Valid, 2094 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2021-12-21 12:26:00,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6465 states. [2021-12-21 12:26:01,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6465 to 5926. [2021-12-21 12:26:01,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5926 states, 5925 states have (on average 1.029535864978903) internal successors, (6100), 5925 states have internal predecessors, (6100), 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) [2021-12-21 12:26:01,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5926 states to 5926 states and 6100 transitions. [2021-12-21 12:26:01,142 INFO L78 Accepts]: Start accepts. Automaton has 5926 states and 6100 transitions. Word has length 2127 [2021-12-21 12:26:01,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:26:01,143 INFO L470 AbstractCegarLoop]: Abstraction has 5926 states and 6100 transitions. [2021-12-21 12:26:01,143 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 4.3) internal successors, (129), 30 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) [2021-12-21 12:26:01,144 INFO L276 IsEmpty]: Start isEmpty. Operand 5926 states and 6100 transitions. [2021-12-21 12:26:01,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5920 [2021-12-21 12:26:01,306 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:26:01,307 INFO L514 BasicCegarLoop]: trace histogram [1801, 1800, 1800, 144, 143, 143, 24, 23, 23, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2021-12-21 12:26:01,332 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-12-21 12:26:01,523 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 [2021-12-21 12:26:01,523 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:26:01,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:26:01,524 INFO L85 PathProgramCache]: Analyzing trace with hash 1135179596, now seen corresponding path program 9 times [2021-12-21 12:26:01,525 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:26:01,525 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1270603757] [2021-12-21 12:26:01,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:26:01,525 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms