./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/nla-digbench-scaling/divbin2_unwindbound5.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version c3fed411 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/nla-digbench-scaling/divbin2_unwindbound5.i -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 e46fdb43c1704e8aa9295c108b22e9521ffebb273e9060ca31abf40569948ab2 --- Real Ultimate output --- This is Ultimate 0.2.2-tmp.no-commuhash-c3fed41 [2021-12-17 11:34:58,823 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-17 11:34:58,825 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-17 11:34:58,856 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-17 11:34:58,857 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-17 11:34:58,859 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-17 11:34:58,861 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-17 11:34:58,866 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-17 11:34:58,868 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-17 11:34:58,872 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-17 11:34:58,873 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-17 11:34:58,874 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-17 11:34:58,874 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-17 11:34:58,876 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-17 11:34:58,877 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-17 11:34:58,879 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-17 11:34:58,883 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-17 11:34:58,884 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-17 11:34:58,884 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-17 11:34:58,886 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-17 11:34:58,890 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-17 11:34:58,891 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-17 11:34:58,892 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-17 11:34:58,893 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-17 11:34:58,896 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-17 11:34:58,897 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-17 11:34:58,897 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-17 11:34:58,898 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-17 11:34:58,898 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-17 11:34:58,899 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-17 11:34:58,900 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-17 11:34:58,900 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-17 11:34:58,901 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-17 11:34:58,902 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-17 11:34:58,903 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-17 11:34:58,903 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-17 11:34:58,904 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-17 11:34:58,904 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-17 11:34:58,904 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-17 11:34:58,904 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-17 11:34:58,905 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-17 11:34:58,906 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-17 11:34:58,931 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-17 11:34:58,933 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-17 11:34:58,934 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-17 11:34:58,934 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-17 11:34:58,935 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-17 11:34:58,935 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-17 11:34:58,935 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-17 11:34:58,936 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-17 11:34:58,936 INFO L138 SettingsManager]: * Use SBE=true [2021-12-17 11:34:58,936 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-17 11:34:58,937 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-17 11:34:58,937 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-17 11:34:58,937 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-17 11:34:58,937 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-17 11:34:58,937 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-17 11:34:58,937 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-17 11:34:58,938 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-17 11:34:58,938 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-17 11:34:58,938 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-17 11:34:58,938 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-17 11:34:58,938 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-17 11:34:58,938 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-17 11:34:58,938 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-17 11:34:58,939 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-17 11:34:58,939 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-17 11:34:58,939 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-17 11:34:58,939 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-17 11:34:58,939 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-17 11:34:58,940 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-17 11:34:58,940 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-17 11:34:58,940 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-17 11:34:58,940 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-17 11:34:58,940 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-17 11:34:58,941 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-17 11:34:58,941 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e46fdb43c1704e8aa9295c108b22e9521ffebb273e9060ca31abf40569948ab2 [2021-12-17 11:34:59,132 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-17 11:34:59,155 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-17 11:34:59,157 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-17 11:34:59,158 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-17 11:34:59,159 INFO L275 PluginConnector]: CDTParser initialized [2021-12-17 11:34:59,160 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/nla-digbench-scaling/divbin2_unwindbound5.i [2021-12-17 11:34:59,215 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/824657222/52c3203458314afb82d671e1f8c1795d/FLAGf5ec323e3 [2021-12-17 11:34:59,524 INFO L306 CDTParser]: Found 1 translation units. [2021-12-17 11:34:59,525 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/divbin2_unwindbound5.i [2021-12-17 11:34:59,530 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/824657222/52c3203458314afb82d671e1f8c1795d/FLAGf5ec323e3 [2021-12-17 11:34:59,981 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/824657222/52c3203458314afb82d671e1f8c1795d [2021-12-17 11:34:59,983 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-17 11:34:59,984 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-17 11:34:59,986 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-17 11:34:59,986 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-17 11:34:59,988 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-17 11:34:59,989 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.12 11:34:59" (1/1) ... [2021-12-17 11:34:59,990 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@81749b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 11:34:59, skipping insertion in model container [2021-12-17 11:34:59,990 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.12 11:34:59" (1/1) ... [2021-12-17 11:34:59,994 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-17 11:35:00,007 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-17 11:35:00,143 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/nla-digbench-scaling/divbin2_unwindbound5.i[951,964] [2021-12-17 11:35:00,156 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-17 11:35:00,164 INFO L203 MainTranslator]: Completed pre-run [2021-12-17 11:35:00,177 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/nla-digbench-scaling/divbin2_unwindbound5.i[951,964] [2021-12-17 11:35:00,190 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-17 11:35:00,201 INFO L208 MainTranslator]: Completed translation [2021-12-17 11:35:00,202 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 11:35:00 WrapperNode [2021-12-17 11:35:00,202 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-17 11:35:00,203 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-17 11:35:00,203 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-17 11:35:00,203 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-17 11:35:00,208 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 11:35:00" (1/1) ... [2021-12-17 11:35:00,214 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 11:35:00" (1/1) ... [2021-12-17 11:35:00,230 INFO L137 Inliner]: procedures = 16, calls = 8, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 51 [2021-12-17 11:35:00,230 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-17 11:35:00,231 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-17 11:35:00,231 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-17 11:35:00,231 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-17 11:35:00,237 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 11:35:00" (1/1) ... [2021-12-17 11:35:00,238 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 11:35:00" (1/1) ... [2021-12-17 11:35:00,248 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 11:35:00" (1/1) ... [2021-12-17 11:35:00,248 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 11:35:00" (1/1) ... [2021-12-17 11:35:00,255 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 11:35:00" (1/1) ... [2021-12-17 11:35:00,261 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 11:35:00" (1/1) ... [2021-12-17 11:35:00,264 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 11:35:00" (1/1) ... [2021-12-17 11:35:00,265 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-17 11:35:00,269 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-17 11:35:00,269 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-17 11:35:00,269 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-17 11:35:00,270 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 11:35:00" (1/1) ... [2021-12-17 11:35:00,275 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-17 11:35:00,286 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 11:35:00,296 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-17 11:35:00,298 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-17 11:35:00,324 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-17 11:35:00,324 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-17 11:35:00,324 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-17 11:35:00,324 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-17 11:35:00,324 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-12-17 11:35:00,324 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-12-17 11:35:00,366 INFO L236 CfgBuilder]: Building ICFG [2021-12-17 11:35:00,367 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-17 11:35:00,477 INFO L277 CfgBuilder]: Performing block encoding [2021-12-17 11:35:00,481 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-17 11:35:00,482 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-12-17 11:35:00,483 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.12 11:35:00 BoogieIcfgContainer [2021-12-17 11:35:00,483 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-17 11:35:00,485 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-17 11:35:00,485 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-17 11:35:00,507 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-17 11:35:00,523 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.12 11:34:59" (1/3) ... [2021-12-17 11:35:00,524 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@81be0fb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.12 11:35:00, skipping insertion in model container [2021-12-17 11:35:00,524 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 11:35:00" (2/3) ... [2021-12-17 11:35:00,524 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@81be0fb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.12 11:35:00, skipping insertion in model container [2021-12-17 11:35:00,524 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.12 11:35:00" (3/3) ... [2021-12-17 11:35:00,525 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin2_unwindbound5.i [2021-12-17 11:35:00,529 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-17 11:35:00,529 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-17 11:35:00,566 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-17 11:35:00,572 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-17 11:35:00,573 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-17 11:35:00,606 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 16 states have (on average 1.5625) internal successors, (25), 17 states have internal predecessors, (25), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-17 11:35:00,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-12-17 11:35:00,609 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 11:35:00,609 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 11:35:00,610 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 11:35:00,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 11:35:00,614 INFO L85 PathProgramCache]: Analyzing trace with hash 553144752, now seen corresponding path program 1 times [2021-12-17 11:35:00,621 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 11:35:00,622 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [747302141] [2021-12-17 11:35:00,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 11:35:00,624 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 11:35:00,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 11:35:00,702 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 11:35:00,703 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 11:35:00,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [747302141] [2021-12-17 11:35:00,704 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [747302141] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 11:35:00,704 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 11:35:00,705 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-17 11:35:00,706 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047733546] [2021-12-17 11:35:00,706 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 11:35:00,710 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-17 11:35:00,711 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 11:35:00,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-17 11:35:00,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-17 11:35:00,740 INFO L87 Difference]: Start difference. First operand has 21 states, 16 states have (on average 1.5625) internal successors, (25), 17 states have internal predecessors, (25), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 11:35:00,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 11:35:00,757 INFO L93 Difference]: Finished difference Result 37 states and 52 transitions. [2021-12-17 11:35:00,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-17 11:35:00,759 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-12-17 11:35:00,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 11:35:00,765 INFO L225 Difference]: With dead ends: 37 [2021-12-17 11:35:00,765 INFO L226 Difference]: Without dead ends: 17 [2021-12-17 11:35:00,768 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-17 11:35:00,772 INFO L933 BasicCegarLoop]: 26 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, 26 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-17 11:35:00,773 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-17 11:35:00,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-12-17 11:35:00,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-12-17 11:35:00,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-17 11:35:00,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 22 transitions. [2021-12-17 11:35:00,800 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 22 transitions. Word has length 8 [2021-12-17 11:35:00,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 11:35:00,800 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 22 transitions. [2021-12-17 11:35:00,801 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 11:35:00,801 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 22 transitions. [2021-12-17 11:35:00,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-12-17 11:35:00,802 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 11:35:00,802 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 11:35:00,802 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-17 11:35:00,803 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 11:35:00,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 11:35:00,806 INFO L85 PathProgramCache]: Analyzing trace with hash -803059042, now seen corresponding path program 1 times [2021-12-17 11:35:00,806 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 11:35:00,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1325988397] [2021-12-17 11:35:00,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 11:35:00,807 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 11:35:00,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 11:35:00,898 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 11:35:00,899 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 11:35:00,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1325988397] [2021-12-17 11:35:00,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1325988397] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 11:35:00,899 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 11:35:00,899 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-17 11:35:00,900 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098308195] [2021-12-17 11:35:00,900 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 11:35:00,901 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-17 11:35:00,901 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 11:35:00,901 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-17 11:35:00,902 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-17 11:35:00,902 INFO L87 Difference]: Start difference. First operand 17 states and 22 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 11:35:00,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 11:35:00,914 INFO L93 Difference]: Finished difference Result 31 states and 40 transitions. [2021-12-17 11:35:00,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-17 11:35:00,914 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-12-17 11:35:00,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 11:35:00,915 INFO L225 Difference]: With dead ends: 31 [2021-12-17 11:35:00,915 INFO L226 Difference]: Without dead ends: 19 [2021-12-17 11:35:00,916 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-17 11:35:00,916 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 0 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-17 11:35:00,917 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 55 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-17 11:35:00,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-12-17 11:35:00,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-12-17 11:35:00,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 15 states have (on average 1.4) internal successors, (21), 16 states have internal predecessors, (21), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-17 11:35:00,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 24 transitions. [2021-12-17 11:35:00,921 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 24 transitions. Word has length 10 [2021-12-17 11:35:00,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 11:35:00,921 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 24 transitions. [2021-12-17 11:35:00,921 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 11:35:00,922 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 24 transitions. [2021-12-17 11:35:00,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-17 11:35:00,922 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 11:35:00,922 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 11:35:00,922 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-17 11:35:00,923 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 11:35:00,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 11:35:00,923 INFO L85 PathProgramCache]: Analyzing trace with hash 549278495, now seen corresponding path program 1 times [2021-12-17 11:35:00,923 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 11:35:00,924 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [558657920] [2021-12-17 11:35:00,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 11:35:00,924 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 11:35:00,934 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-17 11:35:00,935 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [955251720] [2021-12-17 11:35:00,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 11:35:00,935 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 11:35:00,936 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 11:35:00,937 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-17 11:35:00,938 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-17 11:35:00,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 11:35:00,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-17 11:35:00,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 11:35:01,070 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 11:35:01,070 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-17 11:35:01,071 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 11:35:01,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [558657920] [2021-12-17 11:35:01,071 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-17 11:35:01,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [955251720] [2021-12-17 11:35:01,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [955251720] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 11:35:01,072 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 11:35:01,072 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-17 11:35:01,075 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1036404889] [2021-12-17 11:35:01,075 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 11:35:01,076 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-17 11:35:01,076 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 11:35:01,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-17 11:35:01,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-12-17 11:35:01,077 INFO L87 Difference]: Start difference. First operand 19 states and 24 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 11:35:01,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 11:35:01,105 INFO L93 Difference]: Finished difference Result 30 states and 36 transitions. [2021-12-17 11:35:01,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-17 11:35:01,105 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-12-17 11:35:01,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 11:35:01,106 INFO L225 Difference]: With dead ends: 30 [2021-12-17 11:35:01,106 INFO L226 Difference]: Without dead ends: 23 [2021-12-17 11:35:01,107 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-12-17 11:35:01,109 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 2 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-17 11:35:01,110 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 56 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-17 11:35:01,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-12-17 11:35:01,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2021-12-17 11:35:01,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-17 11:35:01,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 28 transitions. [2021-12-17 11:35:01,119 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 28 transitions. Word has length 11 [2021-12-17 11:35:01,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 11:35:01,119 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 28 transitions. [2021-12-17 11:35:01,120 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 11:35:01,120 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 28 transitions. [2021-12-17 11:35:01,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-17 11:35:01,121 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 11:35:01,121 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 11:35:01,143 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-12-17 11:35:01,340 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 11:35:01,341 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 11:35:01,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 11:35:01,342 INFO L85 PathProgramCache]: Analyzing trace with hash 551065955, now seen corresponding path program 1 times [2021-12-17 11:35:01,342 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 11:35:01,342 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [591248948] [2021-12-17 11:35:01,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 11:35:01,342 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 11:35:01,353 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-17 11:35:01,353 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [745089402] [2021-12-17 11:35:01,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 11:35:01,354 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 11:35:01,354 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 11:35:01,368 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-17 11:35:01,403 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-17 11:35:01,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 11:35:01,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-17 11:35:01,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 11:35:01,586 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 11:35:01,587 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-17 11:35:01,588 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 11:35:01,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [591248948] [2021-12-17 11:35:01,591 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-17 11:35:01,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [745089402] [2021-12-17 11:35:01,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [745089402] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 11:35:01,592 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 11:35:01,592 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-17 11:35:01,595 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293869065] [2021-12-17 11:35:01,595 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 11:35:01,596 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-17 11:35:01,596 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 11:35:01,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-17 11:35:01,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-12-17 11:35:01,596 INFO L87 Difference]: Start difference. First operand 22 states and 28 transitions. Second operand has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 11:35:01,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 11:35:01,629 INFO L93 Difference]: Finished difference Result 31 states and 38 transitions. [2021-12-17 11:35:01,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-17 11:35:01,630 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-12-17 11:35:01,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 11:35:01,630 INFO L225 Difference]: With dead ends: 31 [2021-12-17 11:35:01,630 INFO L226 Difference]: Without dead ends: 28 [2021-12-17 11:35:01,631 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-12-17 11:35:01,631 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 9 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-17 11:35:01,632 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 76 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-17 11:35:01,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-12-17 11:35:01,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-12-17 11:35:01,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 22 states have (on average 1.3181818181818181) internal successors, (29), 23 states have internal predecessors, (29), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-17 11:35:01,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2021-12-17 11:35:01,635 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 11 [2021-12-17 11:35:01,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 11:35:01,635 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2021-12-17 11:35:01,635 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 11:35:01,636 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2021-12-17 11:35:01,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-12-17 11:35:01,636 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 11:35:01,636 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 11:35:01,657 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-17 11:35:01,851 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2021-12-17 11:35:01,852 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 11:35:01,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 11:35:01,852 INFO L85 PathProgramCache]: Analyzing trace with hash 1647533572, now seen corresponding path program 1 times [2021-12-17 11:35:01,852 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 11:35:01,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [574185676] [2021-12-17 11:35:01,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 11:35:01,853 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 11:35:01,860 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-17 11:35:01,860 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1797738262] [2021-12-17 11:35:01,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 11:35:01,860 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 11:35:01,861 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 11:35:01,872 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-17 11:35:01,875 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-17 11:35:01,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 11:35:01,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-17 11:35:01,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 11:35:01,934 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 11:35:01,934 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 11:35:01,982 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 11:35:01,983 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 11:35:01,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [574185676] [2021-12-17 11:35:01,983 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-17 11:35:01,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1797738262] [2021-12-17 11:35:01,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1797738262] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 11:35:01,983 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-17 11:35:01,983 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 7 [2021-12-17 11:35:01,984 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361877986] [2021-12-17 11:35:01,984 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-17 11:35:01,984 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-17 11:35:01,984 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 11:35:01,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-17 11:35:01,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-12-17 11:35:01,985 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 11:35:02,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 11:35:02,027 INFO L93 Difference]: Finished difference Result 62 states and 80 transitions. [2021-12-17 11:35:02,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-17 11:35:02,027 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-12-17 11:35:02,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 11:35:02,028 INFO L225 Difference]: With dead ends: 62 [2021-12-17 11:35:02,028 INFO L226 Difference]: Without dead ends: 50 [2021-12-17 11:35:02,029 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-12-17 11:35:02,029 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 30 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-17 11:35:02,029 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 102 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-17 11:35:02,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-12-17 11:35:02,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 36. [2021-12-17 11:35:02,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 30 states have (on average 1.3) internal successors, (39), 31 states have internal predecessors, (39), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-17 11:35:02,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2021-12-17 11:35:02,033 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 13 [2021-12-17 11:35:02,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 11:35:02,034 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2021-12-17 11:35:02,034 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 11:35:02,034 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2021-12-17 11:35:02,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-12-17 11:35:02,034 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 11:35:02,035 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 11:35:02,054 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-17 11:35:02,250 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 11:35:02,250 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 11:35:02,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 11:35:02,251 INFO L85 PathProgramCache]: Analyzing trace with hash -791761799, now seen corresponding path program 1 times [2021-12-17 11:35:02,251 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 11:35:02,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1263886142] [2021-12-17 11:35:02,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 11:35:02,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 11:35:02,259 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-17 11:35:02,259 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1582008941] [2021-12-17 11:35:02,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 11:35:02,259 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 11:35:02,259 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 11:35:02,265 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-17 11:35:02,266 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-17 11:35:02,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 11:35:02,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-17 11:35:02,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 11:35:02,343 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 11:35:02,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 11:35:02,390 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 11:35:02,390 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 11:35:02,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1263886142] [2021-12-17 11:35:02,390 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-17 11:35:02,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1582008941] [2021-12-17 11:35:02,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1582008941] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 11:35:02,390 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-17 11:35:02,390 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2021-12-17 11:35:02,390 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1008849644] [2021-12-17 11:35:02,391 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-17 11:35:02,391 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-17 11:35:02,392 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 11:35:02,392 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-17 11:35:02,392 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-12-17 11:35:02,392 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 11:35:02,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 11:35:02,460 INFO L93 Difference]: Finished difference Result 72 states and 88 transitions. [2021-12-17 11:35:02,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-17 11:35:02,460 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-12-17 11:35:02,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 11:35:02,461 INFO L225 Difference]: With dead ends: 72 [2021-12-17 11:35:02,461 INFO L226 Difference]: Without dead ends: 65 [2021-12-17 11:35:02,462 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2021-12-17 11:35:02,462 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 48 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-17 11:35:02,463 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 131 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-17 11:35:02,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-12-17 11:35:02,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 60. [2021-12-17 11:35:02,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 48 states have (on average 1.3541666666666667) internal successors, (65), 51 states have internal predecessors, (65), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-17 11:35:02,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 76 transitions. [2021-12-17 11:35:02,483 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 76 transitions. Word has length 14 [2021-12-17 11:35:02,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 11:35:02,483 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 76 transitions. [2021-12-17 11:35:02,483 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 11:35:02,483 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 76 transitions. [2021-12-17 11:35:02,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-12-17 11:35:02,484 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 11:35:02,484 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 11:35:02,503 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-17 11:35:02,699 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 11:35:02,700 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 11:35:02,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 11:35:02,700 INFO L85 PathProgramCache]: Analyzing trace with hash -789974339, now seen corresponding path program 1 times [2021-12-17 11:35:02,700 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 11:35:02,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1016308755] [2021-12-17 11:35:02,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 11:35:02,700 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 11:35:02,706 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-17 11:35:02,707 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1315465031] [2021-12-17 11:35:02,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 11:35:02,707 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 11:35:02,707 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 11:35:02,708 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-17 11:35:02,709 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-17 11:35:02,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 11:35:02,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-17 11:35:02,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 11:35:02,799 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-17 11:35:02,800 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-17 11:35:02,800 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 11:35:02,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1016308755] [2021-12-17 11:35:02,801 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-17 11:35:02,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1315465031] [2021-12-17 11:35:02,803 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1315465031] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 11:35:02,803 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 11:35:02,803 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-17 11:35:02,803 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [300811604] [2021-12-17 11:35:02,803 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 11:35:02,804 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-17 11:35:02,804 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 11:35:02,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-17 11:35:02,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-17 11:35:02,806 INFO L87 Difference]: Start difference. First operand 60 states and 76 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 11:35:02,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 11:35:02,841 INFO L93 Difference]: Finished difference Result 94 states and 119 transitions. [2021-12-17 11:35:02,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-17 11:35:02,841 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-12-17 11:35:02,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 11:35:02,844 INFO L225 Difference]: With dead ends: 94 [2021-12-17 11:35:02,844 INFO L226 Difference]: Without dead ends: 89 [2021-12-17 11:35:02,845 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-17 11:35:02,845 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 9 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-17 11:35:02,846 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 54 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-17 11:35:02,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-12-17 11:35:02,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 86. [2021-12-17 11:35:02,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 68 states have (on average 1.2794117647058822) internal successors, (87), 71 states have internal predecessors, (87), 10 states have call successors, (10), 7 states have call predecessors, (10), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-17 11:35:02,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 104 transitions. [2021-12-17 11:35:02,857 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 104 transitions. Word has length 14 [2021-12-17 11:35:02,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 11:35:02,857 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 104 transitions. [2021-12-17 11:35:02,857 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 11:35:02,857 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 104 transitions. [2021-12-17 11:35:02,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-12-17 11:35:02,858 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 11:35:02,858 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 11:35:02,875 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-12-17 11:35:03,058 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 11:35:03,059 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 11:35:03,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 11:35:03,059 INFO L85 PathProgramCache]: Analyzing trace with hash 2118336314, now seen corresponding path program 1 times [2021-12-17 11:35:03,059 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 11:35:03,059 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1759360706] [2021-12-17 11:35:03,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 11:35:03,060 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 11:35:03,068 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-17 11:35:03,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [510100724] [2021-12-17 11:35:03,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 11:35:03,072 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 11:35:03,073 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 11:35:03,073 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-17 11:35:03,074 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-17 11:35:03,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 11:35:03,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-17 11:35:03,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 11:35:03,157 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 11:35:03,157 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-17 11:35:03,157 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 11:35:03,157 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1759360706] [2021-12-17 11:35:03,157 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-17 11:35:03,157 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [510100724] [2021-12-17 11:35:03,157 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [510100724] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 11:35:03,157 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 11:35:03,157 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-17 11:35:03,157 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510163039] [2021-12-17 11:35:03,157 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 11:35:03,158 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-17 11:35:03,158 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 11:35:03,158 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-17 11:35:03,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 11:35:03,158 INFO L87 Difference]: Start difference. First operand 86 states and 104 transitions. Second operand has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-17 11:35:03,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 11:35:03,175 INFO L93 Difference]: Finished difference Result 137 states and 164 transitions. [2021-12-17 11:35:03,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-17 11:35:03,175 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-12-17 11:35:03,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 11:35:03,176 INFO L225 Difference]: With dead ends: 137 [2021-12-17 11:35:03,176 INFO L226 Difference]: Without dead ends: 67 [2021-12-17 11:35:03,177 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-17 11:35:03,177 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 0 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-17 11:35:03,178 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 36 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-17 11:35:03,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-12-17 11:35:03,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2021-12-17 11:35:03,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 54 states have (on average 1.2592592592592593) internal successors, (68), 56 states have internal predecessors, (68), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-17 11:35:03,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 80 transitions. [2021-12-17 11:35:03,183 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 80 transitions. Word has length 20 [2021-12-17 11:35:03,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 11:35:03,183 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 80 transitions. [2021-12-17 11:35:03,183 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-17 11:35:03,183 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 80 transitions. [2021-12-17 11:35:03,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-12-17 11:35:03,183 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 11:35:03,184 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 11:35:03,202 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-17 11:35:03,399 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 11:35:03,400 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 11:35:03,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 11:35:03,400 INFO L85 PathProgramCache]: Analyzing trace with hash -1149777120, now seen corresponding path program 1 times [2021-12-17 11:35:03,400 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 11:35:03,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1585814547] [2021-12-17 11:35:03,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 11:35:03,401 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 11:35:03,410 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-17 11:35:03,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [129602336] [2021-12-17 11:35:03,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 11:35:03,411 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 11:35:03,411 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 11:35:03,412 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-17 11:35:03,413 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process Killed by 15