./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/array-fpi/brs1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b 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/array-fpi/brs1.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 1719c559f228c1029533750a96ea896ed07efcc9b139440443e471db2c10d1e7 --- Real Ultimate output --- This is Ultimate 0.2.2-839c364b5d67a0f615c82cb70ab247790648d4a9-839c364 [2021-12-14 11:33:24,167 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-14 11:33:24,169 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-14 11:33:24,202 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-14 11:33:24,202 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-14 11:33:24,205 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-14 11:33:24,206 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-14 11:33:24,208 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-14 11:33:24,209 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-14 11:33:24,212 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-14 11:33:24,212 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-14 11:33:24,213 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-14 11:33:24,213 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-14 11:33:24,215 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-14 11:33:24,216 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-14 11:33:24,221 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-14 11:33:24,221 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-14 11:33:24,222 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-14 11:33:24,223 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-14 11:33:24,227 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-14 11:33:24,228 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-14 11:33:24,229 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-14 11:33:24,230 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-14 11:33:24,230 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-14 11:33:24,235 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-14 11:33:24,235 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-14 11:33:24,235 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-14 11:33:24,236 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-14 11:33:24,237 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-14 11:33:24,237 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-14 11:33:24,238 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-14 11:33:24,239 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-14 11:33:24,240 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-14 11:33:24,241 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-14 11:33:24,242 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-14 11:33:24,242 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-14 11:33:24,242 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-14 11:33:24,242 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-14 11:33:24,243 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-14 11:33:24,243 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-14 11:33:24,244 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-14 11:33:24,244 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-14 11:33:24,269 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-14 11:33:24,269 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-14 11:33:24,270 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-14 11:33:24,270 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-14 11:33:24,271 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-14 11:33:24,271 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-14 11:33:24,271 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-14 11:33:24,271 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-14 11:33:24,272 INFO L138 SettingsManager]: * Use SBE=true [2021-12-14 11:33:24,272 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-14 11:33:24,272 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-14 11:33:24,273 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-14 11:33:24,273 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-14 11:33:24,273 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-14 11:33:24,273 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-14 11:33:24,273 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-14 11:33:24,273 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-14 11:33:24,273 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-14 11:33:24,274 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-14 11:33:24,274 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-14 11:33:24,274 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-14 11:33:24,274 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-14 11:33:24,274 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-14 11:33:24,274 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-14 11:33:24,275 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-14 11:33:24,275 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-14 11:33:24,275 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-14 11:33:24,276 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-14 11:33:24,276 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-14 11:33:24,276 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-14 11:33:24,276 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-14 11:33:24,276 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-14 11:33:24,277 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-14 11:33:24,277 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-14 11:33:24,277 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1719c559f228c1029533750a96ea896ed07efcc9b139440443e471db2c10d1e7 [2021-12-14 11:33:24,468 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-14 11:33:24,485 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-14 11:33:24,487 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-14 11:33:24,488 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-14 11:33:24,489 INFO L275 PluginConnector]: CDTParser initialized [2021-12-14 11:33:24,489 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-fpi/brs1.c [2021-12-14 11:33:24,550 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a7284b7ca/e341fe6861484655ad23bfe5f5c9f74c/FLAG1e887f69f [2021-12-14 11:33:24,858 INFO L306 CDTParser]: Found 1 translation units. [2021-12-14 11:33:24,859 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-fpi/brs1.c [2021-12-14 11:33:24,865 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a7284b7ca/e341fe6861484655ad23bfe5f5c9f74c/FLAG1e887f69f [2021-12-14 11:33:24,877 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a7284b7ca/e341fe6861484655ad23bfe5f5c9f74c [2021-12-14 11:33:24,879 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-14 11:33:24,880 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-14 11:33:24,883 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-14 11:33:24,883 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-14 11:33:24,885 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-14 11:33:24,886 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 11:33:24" (1/1) ... [2021-12-14 11:33:24,886 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5eb1116 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:33:24, skipping insertion in model container [2021-12-14 11:33:24,886 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 11:33:24" (1/1) ... [2021-12-14 11:33:24,890 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-14 11:33:24,898 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-14 11:33:25,000 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/array-fpi/brs1.c[587,600] [2021-12-14 11:33:25,015 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-14 11:33:25,020 INFO L203 MainTranslator]: Completed pre-run [2021-12-14 11:33:25,027 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/array-fpi/brs1.c[587,600] [2021-12-14 11:33:25,031 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-14 11:33:25,039 INFO L208 MainTranslator]: Completed translation [2021-12-14 11:33:25,039 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:33:25 WrapperNode [2021-12-14 11:33:25,039 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-14 11:33:25,040 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-14 11:33:25,040 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-14 11:33:25,040 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-14 11:33:25,049 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:33:25" (1/1) ... [2021-12-14 11:33:25,054 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:33:25" (1/1) ... [2021-12-14 11:33:25,066 INFO L137 Inliner]: procedures = 17, calls = 27, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 73 [2021-12-14 11:33:25,066 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-14 11:33:25,067 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-14 11:33:25,067 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-14 11:33:25,067 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-14 11:33:25,071 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:33:25" (1/1) ... [2021-12-14 11:33:25,072 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:33:25" (1/1) ... [2021-12-14 11:33:25,073 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:33:25" (1/1) ... [2021-12-14 11:33:25,073 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:33:25" (1/1) ... [2021-12-14 11:33:25,077 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:33:25" (1/1) ... [2021-12-14 11:33:25,081 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:33:25" (1/1) ... [2021-12-14 11:33:25,084 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:33:25" (1/1) ... [2021-12-14 11:33:25,086 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-14 11:33:25,087 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-14 11:33:25,087 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-14 11:33:25,087 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-14 11:33:25,088 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:33:25" (1/1) ... [2021-12-14 11:33:25,096 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-14 11:33:25,108 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 11:33:25,118 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) [2021-12-14 11:33:25,148 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 [2021-12-14 11:33:25,155 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-14 11:33:25,155 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-14 11:33:25,155 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-14 11:33:25,155 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-12-14 11:33:25,156 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-14 11:33:25,156 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-14 11:33:25,156 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-14 11:33:25,156 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-12-14 11:33:25,156 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-14 11:33:25,202 INFO L236 CfgBuilder]: Building ICFG [2021-12-14 11:33:25,203 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-14 11:33:25,338 INFO L277 CfgBuilder]: Performing block encoding [2021-12-14 11:33:25,352 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-14 11:33:25,352 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-12-14 11:33:25,353 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 11:33:25 BoogieIcfgContainer [2021-12-14 11:33:25,354 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-14 11:33:25,355 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-14 11:33:25,355 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-14 11:33:25,357 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-14 11:33:25,358 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 11:33:24" (1/3) ... [2021-12-14 11:33:25,358 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b4d70c6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 11:33:25, skipping insertion in model container [2021-12-14 11:33:25,358 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:33:25" (2/3) ... [2021-12-14 11:33:25,358 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b4d70c6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 11:33:25, skipping insertion in model container [2021-12-14 11:33:25,359 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 11:33:25" (3/3) ... [2021-12-14 11:33:25,360 INFO L111 eAbstractionObserver]: Analyzing ICFG brs1.c [2021-12-14 11:33:25,363 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-14 11:33:25,363 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-14 11:33:25,393 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-14 11:33:25,397 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 [2021-12-14 11:33:25,398 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-14 11:33:25,406 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 19 states have internal predecessors, (28), 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) [2021-12-14 11:33:25,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-14 11:33:25,410 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 11:33:25,410 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 11:33:25,411 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 11:33:25,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 11:33:25,414 INFO L85 PathProgramCache]: Analyzing trace with hash 361760665, now seen corresponding path program 1 times [2021-12-14 11:33:25,420 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 11:33:25,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1888871362] [2021-12-14 11:33:25,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 11:33:25,421 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 11:33:25,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:33:25,511 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 11:33:25,511 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 11:33:25,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1888871362] [2021-12-14 11:33:25,512 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1888871362] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 11:33:25,512 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-14 11:33:25,513 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-14 11:33:25,514 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419712619] [2021-12-14 11:33:25,514 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 11:33:25,517 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-14 11:33:25,517 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 11:33:25,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-14 11:33:25,541 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-14 11:33:25,543 INFO L87 Difference]: Start difference. First operand has 20 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 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) [2021-12-14 11:33:25,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 11:33:25,553 INFO L93 Difference]: Finished difference Result 36 states and 50 transitions. [2021-12-14 11:33:25,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-14 11:33:25,555 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 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 11 [2021-12-14 11:33:25,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 11:33:25,561 INFO L225 Difference]: With dead ends: 36 [2021-12-14 11:33:25,565 INFO L226 Difference]: Without dead ends: 16 [2021-12-14 11:33:25,568 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-14 11:33:25,571 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 11:33:25,572 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 11:33:25,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-12-14 11:33:25,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-12-14 11:33:25,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 11:33:25,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-12-14 11:33:25,591 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 11 [2021-12-14 11:33:25,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 11:33:25,591 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-12-14 11:33:25,591 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 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) [2021-12-14 11:33:25,592 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-12-14 11:33:25,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-14 11:33:25,592 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 11:33:25,592 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 11:33:25,592 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-14 11:33:25,593 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 11:33:25,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 11:33:25,595 INFO L85 PathProgramCache]: Analyzing trace with hash -447913662, now seen corresponding path program 1 times [2021-12-14 11:33:25,595 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 11:33:25,595 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1386159350] [2021-12-14 11:33:25,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 11:33:25,595 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 11:33:25,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:33:25,646 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 11:33:25,646 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 11:33:25,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1386159350] [2021-12-14 11:33:25,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1386159350] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 11:33:25,647 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-14 11:33:25,647 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-14 11:33:25,647 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203376910] [2021-12-14 11:33:25,647 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 11:33:25,648 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-14 11:33:25,649 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 11:33:25,649 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-14 11:33:25,649 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-14 11:33:25,650 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 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) [2021-12-14 11:33:25,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 11:33:25,700 INFO L93 Difference]: Finished difference Result 30 states and 36 transitions. [2021-12-14 11:33:25,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-14 11:33:25,701 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 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 11 [2021-12-14 11:33:25,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 11:33:25,701 INFO L225 Difference]: With dead ends: 30 [2021-12-14 11:33:25,701 INFO L226 Difference]: Without dead ends: 22 [2021-12-14 11:33:25,701 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-14 11:33:25,702 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 16 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 11:33:25,703 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 11 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 11:33:25,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-12-14 11:33:25,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 19. [2021-12-14 11:33:25,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 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) [2021-12-14 11:33:25,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2021-12-14 11:33:25,706 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 11 [2021-12-14 11:33:25,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 11:33:25,706 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2021-12-14 11:33:25,706 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 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) [2021-12-14 11:33:25,706 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2021-12-14 11:33:25,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-12-14 11:33:25,707 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 11:33:25,707 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 11:33:25,707 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-14 11:33:25,707 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 11:33:25,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 11:33:25,708 INFO L85 PathProgramCache]: Analyzing trace with hash 1044113915, now seen corresponding path program 1 times [2021-12-14 11:33:25,708 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 11:33:25,708 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [614325447] [2021-12-14 11:33:25,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 11:33:25,708 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 11:33:25,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:33:25,814 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-14 11:33:25,815 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 11:33:25,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [614325447] [2021-12-14 11:33:25,815 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [614325447] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 11:33:25,815 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-14 11:33:25,816 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-14 11:33:25,816 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882182596] [2021-12-14 11:33:25,816 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 11:33:25,816 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-14 11:33:25,816 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 11:33:25,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-14 11:33:25,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-12-14 11:33:25,817 INFO L87 Difference]: Start difference. First operand 19 states and 21 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) [2021-12-14 11:33:25,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 11:33:25,866 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2021-12-14 11:33:25,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-14 11:33:25,867 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 17 [2021-12-14 11:33:25,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 11:33:25,868 INFO L225 Difference]: With dead ends: 26 [2021-12-14 11:33:25,868 INFO L226 Difference]: Without dead ends: 22 [2021-12-14 11:33:25,869 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-12-14 11:33:25,873 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 12 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 11:33:25,876 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 27 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 11:33:25,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-12-14 11:33:25,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-12-14 11:33:25,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 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) [2021-12-14 11:33:25,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2021-12-14 11:33:25,879 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 17 [2021-12-14 11:33:25,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 11:33:25,879 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2021-12-14 11:33:25,879 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) [2021-12-14 11:33:25,879 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2021-12-14 11:33:25,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-12-14 11:33:25,880 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 11:33:25,880 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 11:33:25,880 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-12-14 11:33:25,881 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 11:33:25,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 11:33:25,881 INFO L85 PathProgramCache]: Analyzing trace with hash -1654199858, now seen corresponding path program 1 times [2021-12-14 11:33:25,881 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 11:33:25,882 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1576285688] [2021-12-14 11:33:25,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 11:33:25,882 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 11:33:25,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:33:25,959 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 11:33:25,960 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 11:33:25,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1576285688] [2021-12-14 11:33:25,961 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1576285688] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 11:33:25,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [411898294] [2021-12-14 11:33:25,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 11:33:25,961 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:33:25,962 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 11:33:25,964 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) [2021-12-14 11:33:25,965 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-14 11:33:26,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:33:26,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-14 11:33:26,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 11:33:26,106 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 11:33:26,106 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 11:33:26,147 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 11:33:26,147 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [411898294] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 11:33:26,147 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 11:33:26,148 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 11 [2021-12-14 11:33:26,148 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059593348] [2021-12-14 11:33:26,148 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 11:33:26,148 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-14 11:33:26,149 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 11:33:26,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-14 11:33:26,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2021-12-14 11:33:26,149 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 11 states, 11 states have (on average 3.0) internal successors, (33), 11 states have internal predecessors, (33), 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) [2021-12-14 11:33:26,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 11:33:26,214 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2021-12-14 11:33:26,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-14 11:33:26,214 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.0) internal successors, (33), 11 states have internal predecessors, (33), 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 20 [2021-12-14 11:33:26,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 11:33:26,215 INFO L225 Difference]: With dead ends: 42 [2021-12-14 11:33:26,215 INFO L226 Difference]: Without dead ends: 28 [2021-12-14 11:33:26,215 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2021-12-14 11:33:26,216 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 29 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 11:33:26,216 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 21 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 11:33:26,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-12-14 11:33:26,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 24. [2021-12-14 11:33:26,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 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) [2021-12-14 11:33:26,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2021-12-14 11:33:26,224 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 20 [2021-12-14 11:33:26,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 11:33:26,224 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2021-12-14 11:33:26,225 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 3.0) internal successors, (33), 11 states have internal predecessors, (33), 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) [2021-12-14 11:33:26,225 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2021-12-14 11:33:26,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-12-14 11:33:26,226 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 11:33:26,226 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 11:33:26,244 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-14 11:33:26,433 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:33:26,434 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 11:33:26,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 11:33:26,434 INFO L85 PathProgramCache]: Analyzing trace with hash 1179965024, now seen corresponding path program 2 times [2021-12-14 11:33:26,434 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 11:33:26,435 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1867671987] [2021-12-14 11:33:26,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 11:33:26,435 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 11:33:26,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:33:26,744 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 11:33:26,744 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 11:33:26,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1867671987] [2021-12-14 11:33:26,744 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1867671987] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 11:33:26,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1273344905] [2021-12-14 11:33:26,745 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-14 11:33:26,745 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:33:26,745 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 11:33:26,746 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) [2021-12-14 11:33:26,747 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-14 11:33:26,792 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-14 11:33:26,792 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 11:33:26,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 32 conjunts are in the unsatisfiable core [2021-12-14 11:33:26,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 11:33:26,836 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-12-14 11:33:26,929 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-14 11:33:27,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-12-14 11:33:27,131 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-12-14 11:33:27,132 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 35 [2021-12-14 11:33:27,318 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-14 11:33:27,320 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 10 [2021-12-14 11:33:27,358 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 11:33:27,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 11:33:28,795 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 238 treesize of output 222 [2021-12-14 11:33:29,085 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 11:33:29,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1273344905] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 11:33:29,085 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 11:33:29,085 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 14, 14] total 33 [2021-12-14 11:33:29,086 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [191398872] [2021-12-14 11:33:29,086 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 11:33:29,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-12-14 11:33:29,086 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 11:33:29,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-12-14 11:33:29,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=874, Unknown=1, NotChecked=0, Total=1056 [2021-12-14 11:33:29,088 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 33 states, 33 states have (on average 1.8181818181818181) internal successors, (60), 33 states have internal predecessors, (60), 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) [2021-12-14 11:33:29,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 11:33:29,544 INFO L93 Difference]: Finished difference Result 60 states and 70 transitions. [2021-12-14 11:33:29,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-12-14 11:33:29,545 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.8181818181818181) internal successors, (60), 33 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-12-14 11:33:29,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 11:33:29,546 INFO L225 Difference]: With dead ends: 60 [2021-12-14 11:33:29,546 INFO L226 Difference]: Without dead ends: 48 [2021-12-14 11:33:29,547 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 24 SyntacticMatches, 3 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 600 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=360, Invalid=1531, Unknown=1, NotChecked=0, Total=1892 [2021-12-14 11:33:29,548 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 47 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 167 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-14 11:33:29,548 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 53 Invalid, 343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 147 Invalid, 0 Unknown, 167 Unchecked, 0.1s Time] [2021-12-14 11:33:29,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-12-14 11:33:29,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 42. [2021-12-14 11:33:29,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.146341463414634) internal successors, (47), 41 states have internal predecessors, (47), 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) [2021-12-14 11:33:29,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2021-12-14 11:33:29,553 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 23 [2021-12-14 11:33:29,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 11:33:29,553 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2021-12-14 11:33:29,553 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.8181818181818181) internal successors, (60), 33 states have internal predecessors, (60), 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) [2021-12-14 11:33:29,553 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2021-12-14 11:33:29,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-14 11:33:29,554 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 11:33:29,554 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 11:33:29,572 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-14 11:33:29,767 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:33:29,767 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 11:33:29,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 11:33:29,768 INFO L85 PathProgramCache]: Analyzing trace with hash -179575874, now seen corresponding path program 3 times [2021-12-14 11:33:29,768 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 11:33:29,769 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [996627012] [2021-12-14 11:33:29,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 11:33:29,769 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 11:33:29,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:33:29,812 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-12-14 11:33:29,813 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 11:33:29,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [996627012] [2021-12-14 11:33:29,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [996627012] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 11:33:29,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1168383249] [2021-12-14 11:33:29,813 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-14 11:33:29,814 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:33:29,814 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 11:33:29,815 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) [2021-12-14 11:33:29,816 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-14 11:33:29,861 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-12-14 11:33:29,862 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 11:33:29,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 9 conjunts are in the unsatisfiable core [2021-12-14 11:33:29,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 11:33:29,982 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 22 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 11:33:29,982 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 11:33:30,080 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 22 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 11:33:30,081 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1168383249] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 11:33:30,082 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 11:33:30,082 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 10, 10] total 19 [2021-12-14 11:33:30,082 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230158484] [2021-12-14 11:33:30,082 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 11:33:30,083 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-12-14 11:33:30,083 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 11:33:30,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-12-14 11:33:30,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=257, Unknown=0, NotChecked=0, Total=342 [2021-12-14 11:33:30,084 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand has 19 states, 19 states have (on average 3.1578947368421053) internal successors, (60), 19 states have internal predecessors, (60), 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) [2021-12-14 11:33:30,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 11:33:30,326 INFO L93 Difference]: Finished difference Result 77 states and 89 transitions. [2021-12-14 11:33:30,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-12-14 11:33:30,327 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.1578947368421053) internal successors, (60), 19 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-12-14 11:33:30,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 11:33:30,328 INFO L225 Difference]: With dead ends: 77 [2021-12-14 11:33:30,328 INFO L226 Difference]: Without dead ends: 59 [2021-12-14 11:33:30,328 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 178 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=204, Invalid=666, Unknown=0, NotChecked=0, Total=870 [2021-12-14 11:33:30,329 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 115 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 267 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 325 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 267 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-14 11:33:30,329 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [115 Valid, 49 Invalid, 325 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 267 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-14 11:33:30,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-12-14 11:33:30,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 41. [2021-12-14 11:33:30,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.075) internal successors, (43), 40 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 11:33:30,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2021-12-14 11:33:30,333 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 29 [2021-12-14 11:33:30,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 11:33:30,333 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2021-12-14 11:33:30,333 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 3.1578947368421053) internal successors, (60), 19 states have internal predecessors, (60), 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) [2021-12-14 11:33:30,334 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2021-12-14 11:33:30,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-14 11:33:30,334 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 11:33:30,334 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 11:33:30,352 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-14 11:33:30,547 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:33:30,547 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 11:33:30,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 11:33:30,548 INFO L85 PathProgramCache]: Analyzing trace with hash -690020773, now seen corresponding path program 4 times [2021-12-14 11:33:30,548 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 11:33:30,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [7775113] [2021-12-14 11:33:30,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 11:33:30,548 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 11:33:30,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:33:30,958 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 11:33:30,958 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 11:33:30,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [7775113] [2021-12-14 11:33:30,958 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [7775113] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 11:33:30,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [330001071] [2021-12-14 11:33:30,958 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-14 11:33:30,958 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:33:30,958 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 11:33:30,960 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) [2021-12-14 11:33:30,961 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-14 11:33:30,996 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-14 11:33:30,996 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 11:33:30,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 34 conjunts are in the unsatisfiable core [2021-12-14 11:33:31,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 11:33:31,053 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-14 11:33:31,131 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-12-14 11:33:31,132 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-12-14 11:33:31,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-14 11:33:31,260 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-12-14 11:33:31,261 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 32 [2021-12-14 11:33:31,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-14 11:33:31,344 INFO L354 Elim1Store]: treesize reduction 40, result has 2.4 percent of original size [2021-12-14 11:33:31,344 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 54 treesize of output 51 [2021-12-14 11:33:31,426 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-14 11:33:31,428 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-12-14 11:33:31,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 58 treesize of output 40 [2021-12-14 11:33:31,532 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-14 11:33:31,534 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-12-14 11:33:31,535 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 47 treesize of output 15 [2021-12-14 11:33:31,563 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 11:33:31,564 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 11:33:55,810 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-12-14 11:33:55,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 2119 treesize of output 2065