./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/array-tiling/rewnifrev2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version c3fed411 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/array-tiling/rewnifrev2.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash a70897b8f9d01ade64d517ee2bf20dd64d1adb0a94ea95e1a8b2431f33b62533 --- Real Ultimate output --- This is Ultimate 0.2.2-tmp.no-commuhash-c3fed41 [2021-12-15 21:35:46,746 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-15 21:35:46,748 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-15 21:35:46,802 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-15 21:35:46,802 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-15 21:35:46,804 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-15 21:35:46,806 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-15 21:35:46,810 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-15 21:35:46,811 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-15 21:35:46,811 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-15 21:35:46,812 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-15 21:35:46,813 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-15 21:35:46,813 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-15 21:35:46,818 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-15 21:35:46,819 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-15 21:35:46,822 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-15 21:35:46,823 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-15 21:35:46,824 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-15 21:35:46,825 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-15 21:35:46,827 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-15 21:35:46,830 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-15 21:35:46,830 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-15 21:35:46,831 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-15 21:35:46,832 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-15 21:35:46,833 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-15 21:35:46,833 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-15 21:35:46,833 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-15 21:35:46,834 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-15 21:35:46,834 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-15 21:35:46,835 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-15 21:35:46,835 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-15 21:35:46,836 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-15 21:35:46,836 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-15 21:35:46,836 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-15 21:35:46,837 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-15 21:35:46,837 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-15 21:35:46,838 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-15 21:35:46,838 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-15 21:35:46,839 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-15 21:35:46,839 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-15 21:35:46,840 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-15 21:35:46,841 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-15 21:35:46,861 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-15 21:35:46,866 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-15 21:35:46,866 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-15 21:35:46,866 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-15 21:35:46,867 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-15 21:35:46,867 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-15 21:35:46,867 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-15 21:35:46,867 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-15 21:35:46,868 INFO L138 SettingsManager]: * Use SBE=true [2021-12-15 21:35:46,868 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-15 21:35:46,868 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-15 21:35:46,869 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-15 21:35:46,869 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-15 21:35:46,869 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-15 21:35:46,869 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-15 21:35:46,869 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-15 21:35:46,869 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-15 21:35:46,869 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-15 21:35:46,870 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-15 21:35:46,870 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-15 21:35:46,870 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-15 21:35:46,870 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-15 21:35:46,870 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-15 21:35:46,870 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-15 21:35:46,870 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-15 21:35:46,871 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-15 21:35:46,871 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-15 21:35:46,871 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-15 21:35:46,871 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-15 21:35:46,871 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-15 21:35:46,871 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-15 21:35:46,872 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-15 21:35:46,872 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-15 21:35:46,872 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-15 21:35:46,872 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a70897b8f9d01ade64d517ee2bf20dd64d1adb0a94ea95e1a8b2431f33b62533 [2021-12-15 21:35:47,062 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-15 21:35:47,081 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-15 21:35:47,083 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-15 21:35:47,084 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-15 21:35:47,085 INFO L275 PluginConnector]: CDTParser initialized [2021-12-15 21:35:47,086 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-tiling/rewnifrev2.c [2021-12-15 21:35:47,124 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3d74222cd/bf10830e02a640b2b8621ad9102e58ae/FLAGf1482cbf3 [2021-12-15 21:35:47,456 INFO L306 CDTParser]: Found 1 translation units. [2021-12-15 21:35:47,457 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-tiling/rewnifrev2.c [2021-12-15 21:35:47,461 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3d74222cd/bf10830e02a640b2b8621ad9102e58ae/FLAGf1482cbf3 [2021-12-15 21:35:47,900 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3d74222cd/bf10830e02a640b2b8621ad9102e58ae [2021-12-15 21:35:47,902 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-15 21:35:47,903 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-15 21:35:47,904 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-15 21:35:47,904 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-15 21:35:47,906 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-15 21:35:47,906 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.12 09:35:47" (1/1) ... [2021-12-15 21:35:47,907 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6697f57a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 09:35:47, skipping insertion in model container [2021-12-15 21:35:47,907 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.12 09:35:47" (1/1) ... [2021-12-15 21:35:47,911 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-15 21:35:47,921 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-15 21:35:48,018 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-tiling/rewnifrev2.c[401,414] [2021-12-15 21:35:48,026 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-15 21:35:48,032 INFO L203 MainTranslator]: Completed pre-run [2021-12-15 21:35:48,039 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-tiling/rewnifrev2.c[401,414] [2021-12-15 21:35:48,042 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-15 21:35:48,049 INFO L208 MainTranslator]: Completed translation [2021-12-15 21:35:48,050 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 09:35:48 WrapperNode [2021-12-15 21:35:48,050 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-15 21:35:48,050 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-15 21:35:48,051 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-15 21:35:48,051 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-15 21:35:48,055 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 09:35:48" (1/1) ... [2021-12-15 21:35:48,059 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 09:35:48" (1/1) ... [2021-12-15 21:35:48,071 INFO L137 Inliner]: procedures = 16, calls = 12, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 48 [2021-12-15 21:35:48,071 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-15 21:35:48,072 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-15 21:35:48,072 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-15 21:35:48,072 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-15 21:35:48,077 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 09:35:48" (1/1) ... [2021-12-15 21:35:48,077 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 09:35:48" (1/1) ... [2021-12-15 21:35:48,084 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 09:35:48" (1/1) ... [2021-12-15 21:35:48,085 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 09:35:48" (1/1) ... [2021-12-15 21:35:48,096 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 09:35:48" (1/1) ... [2021-12-15 21:35:48,100 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 09:35:48" (1/1) ... [2021-12-15 21:35:48,101 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 09:35:48" (1/1) ... [2021-12-15 21:35:48,102 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-15 21:35:48,111 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-15 21:35:48,112 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-15 21:35:48,112 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-15 21:35:48,113 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 09:35:48" (1/1) ... [2021-12-15 21:35:48,117 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-15 21:35:48,125 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-15 21:35:48,133 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) [2021-12-15 21:35:48,135 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 [2021-12-15 21:35:48,156 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-15 21:35:48,156 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-15 21:35:48,156 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-12-15 21:35:48,157 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-15 21:35:48,157 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-15 21:35:48,157 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-15 21:35:48,157 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-12-15 21:35:48,199 INFO L236 CfgBuilder]: Building ICFG [2021-12-15 21:35:48,200 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-15 21:35:48,265 INFO L277 CfgBuilder]: Performing block encoding [2021-12-15 21:35:48,269 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-15 21:35:48,270 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-12-15 21:35:48,271 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.12 09:35:48 BoogieIcfgContainer [2021-12-15 21:35:48,271 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-15 21:35:48,272 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-15 21:35:48,272 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-15 21:35:48,279 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-15 21:35:48,279 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.12 09:35:47" (1/3) ... [2021-12-15 21:35:48,280 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12a2b9e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.12 09:35:48, skipping insertion in model container [2021-12-15 21:35:48,280 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 09:35:48" (2/3) ... [2021-12-15 21:35:48,281 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12a2b9e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.12 09:35:48, skipping insertion in model container [2021-12-15 21:35:48,281 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.12 09:35:48" (3/3) ... [2021-12-15 21:35:48,282 INFO L111 eAbstractionObserver]: Analyzing ICFG rewnifrev2.c [2021-12-15 21:35:48,285 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-15 21:35:48,285 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-15 21:35:48,311 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-15 21:35:48,315 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 [2021-12-15 21:35:48,315 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-15 21:35:48,323 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 14 states have (on average 1.5) internal successors, (21), 15 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:35:48,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-12-15 21:35:48,326 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 21:35:48,326 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-12-15 21:35:48,327 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 21:35:48,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 21:35:48,330 INFO L85 PathProgramCache]: Analyzing trace with hash 126991449, now seen corresponding path program 1 times [2021-12-15 21:35:48,335 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 21:35:48,336 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1699030315] [2021-12-15 21:35:48,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 21:35:48,337 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 21:35:48,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 21:35:48,434 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 21:35:48,434 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 21:35:48,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1699030315] [2021-12-15 21:35:48,435 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1699030315] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-15 21:35:48,435 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-15 21:35:48,436 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-15 21:35:48,437 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [610158961] [2021-12-15 21:35:48,437 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-15 21:35:48,440 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-15 21:35:48,440 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 21:35:48,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-15 21:35:48,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-15 21:35:48,462 INFO L87 Difference]: Start difference. First operand has 16 states, 14 states have (on average 1.5) internal successors, (21), 15 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:35:48,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 21:35:48,475 INFO L93 Difference]: Finished difference Result 27 states and 34 transitions. [2021-12-15 21:35:48,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-15 21:35:48,477 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-12-15 21:35:48,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-15 21:35:48,482 INFO L225 Difference]: With dead ends: 27 [2021-12-15 21:35:48,482 INFO L226 Difference]: Without dead ends: 12 [2021-12-15 21:35:48,484 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 [2021-12-15 21:35:48,487 INFO L933 BasicCegarLoop]: 18 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, 18 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 [2021-12-15 21:35:48,488 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-15 21:35:48,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-12-15 21:35:48,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-12-15 21:35:48,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:35:48,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2021-12-15 21:35:48,508 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 8 [2021-12-15 21:35:48,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-15 21:35:48,509 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2021-12-15 21:35:48,509 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:35:48,509 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2021-12-15 21:35:48,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-12-15 21:35:48,510 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 21:35:48,510 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-12-15 21:35:48,510 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-15 21:35:48,511 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 21:35:48,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 21:35:48,515 INFO L85 PathProgramCache]: Analyzing trace with hash 121450323, now seen corresponding path program 1 times [2021-12-15 21:35:48,515 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 21:35:48,515 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2074092775] [2021-12-15 21:35:48,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 21:35:48,516 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 21:35:48,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 21:35:48,583 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 21:35:48,583 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 21:35:48,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2074092775] [2021-12-15 21:35:48,583 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2074092775] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-15 21:35:48,583 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-15 21:35:48,584 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-15 21:35:48,584 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [437589544] [2021-12-15 21:35:48,584 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-15 21:35:48,585 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-15 21:35:48,585 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 21:35:48,585 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-15 21:35:48,585 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-15 21:35:48,585 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:35:48,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 21:35:48,627 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2021-12-15 21:35:48,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-15 21:35:48,627 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-12-15 21:35:48,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-15 21:35:48,627 INFO L225 Difference]: With dead ends: 20 [2021-12-15 21:35:48,628 INFO L226 Difference]: Without dead ends: 13 [2021-12-15 21:35:48,628 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-15 21:35:48,629 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 6 mSDsluCounter, 1 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-15 21:35:48,629 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 10 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-15 21:35:48,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-12-15 21:35:48,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-12-15 21:35:48,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:35:48,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-12-15 21:35:48,631 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 8 [2021-12-15 21:35:48,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-15 21:35:48,632 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-12-15 21:35:48,632 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:35:48,632 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-12-15 21:35:48,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-12-15 21:35:48,632 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 21:35:48,632 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-15 21:35:48,632 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-15 21:35:48,632 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 21:35:48,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 21:35:48,633 INFO L85 PathProgramCache]: Analyzing trace with hash -1899941007, now seen corresponding path program 1 times [2021-12-15 21:35:48,633 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 21:35:48,633 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1991121912] [2021-12-15 21:35:48,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 21:35:48,633 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 21:35:48,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 21:35:48,853 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 21:35:48,853 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 21:35:48,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1991121912] [2021-12-15 21:35:48,854 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1991121912] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-15 21:35:48,855 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-15 21:35:48,855 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-12-15 21:35:48,855 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2062937053] [2021-12-15 21:35:48,855 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-15 21:35:48,856 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-15 21:35:48,856 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 21:35:48,857 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-15 21:35:48,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-12-15 21:35:48,857 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 8 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:35:48,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 21:35:48,950 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2021-12-15 21:35:48,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-15 21:35:48,950 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-12-15 21:35:48,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-15 21:35:48,951 INFO L225 Difference]: With dead ends: 19 [2021-12-15 21:35:48,951 INFO L226 Difference]: Without dead ends: 17 [2021-12-15 21:35:48,953 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-12-15 21:35:48,958 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 23 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-15 21:35:48,959 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 17 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-15 21:35:48,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-12-15 21:35:48,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 15. [2021-12-15 21:35:48,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:35:48,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-12-15 21:35:48,964 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2021-12-15 21:35:48,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-15 21:35:48,965 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-12-15 21:35:48,965 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:35:48,965 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-12-15 21:35:48,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-12-15 21:35:48,965 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 21:35:48,966 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-15 21:35:48,966 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-12-15 21:35:48,966 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 21:35:48,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 21:35:48,967 INFO L85 PathProgramCache]: Analyzing trace with hash 604563239, now seen corresponding path program 1 times [2021-12-15 21:35:48,967 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 21:35:48,967 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [58758382] [2021-12-15 21:35:48,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 21:35:48,967 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 21:35:48,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 21:35:49,081 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 21:35:49,081 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 21:35:49,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [58758382] [2021-12-15 21:35:49,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [58758382] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-15 21:35:49,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [681528009] [2021-12-15 21:35:49,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 21:35:49,082 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 21:35:49,082 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-15 21:35:49,084 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) [2021-12-15 21:35:49,103 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-15 21:35:49,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 21:35:49,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-15 21:35:49,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-15 21:35:49,236 INFO L354 Elim1Store]: treesize reduction 39, result has 22.0 percent of original size [2021-12-15 21:35:49,236 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-12-15 21:35:49,455 INFO L354 Elim1Store]: treesize reduction 12, result has 20.0 percent of original size [2021-12-15 21:35:49,456 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 12 [2021-12-15 21:35:49,478 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 21:35:49,481 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-15 21:35:49,612 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 21:35:49,612 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [681528009] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-15 21:35:49,612 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-15 21:35:49,613 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 19 [2021-12-15 21:35:49,613 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165593589] [2021-12-15 21:35:49,613 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-15 21:35:49,614 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-12-15 21:35:49,615 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 21:35:49,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-12-15 21:35:49,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=257, Unknown=0, NotChecked=0, Total=342 [2021-12-15 21:35:49,619 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 19 states, 19 states have (on average 1.736842105263158) internal successors, (33), 19 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:35:49,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 21:35:49,848 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2021-12-15 21:35:49,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-15 21:35:49,848 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.736842105263158) internal successors, (33), 19 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-12-15 21:35:49,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-15 21:35:49,849 INFO L225 Difference]: With dead ends: 24 [2021-12-15 21:35:49,849 INFO L226 Difference]: Without dead ends: 22 [2021-12-15 21:35:49,849 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 16 SyntacticMatches, 4 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=194, Invalid=508, Unknown=0, NotChecked=0, Total=702 [2021-12-15 21:35:49,849 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 45 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 19 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-15 21:35:49,850 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 34 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 56 Invalid, 0 Unknown, 19 Unchecked, 0.1s Time] [2021-12-15 21:35:49,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-12-15 21:35:49,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 19. [2021-12-15 21:35:49,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:35:49,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-12-15 21:35:49,852 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2021-12-15 21:35:49,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-15 21:35:49,852 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-12-15 21:35:49,852 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.736842105263158) internal successors, (33), 19 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:35:49,852 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-12-15 21:35:49,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-12-15 21:35:49,853 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 21:35:49,853 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-15 21:35:49,870 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-12-15 21:35:50,062 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 21:35:50,063 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 21:35:50,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 21:35:50,063 INFO L85 PathProgramCache]: Analyzing trace with hash -1572614179, now seen corresponding path program 2 times [2021-12-15 21:35:50,063 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 21:35:50,063 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1996814182] [2021-12-15 21:35:50,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 21:35:50,063 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 21:35:50,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 21:35:50,124 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 21:35:50,124 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 21:35:50,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1996814182] [2021-12-15 21:35:50,125 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1996814182] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-15 21:35:50,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [919879307] [2021-12-15 21:35:50,125 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-15 21:35:50,125 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 21:35:50,125 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-15 21:35:50,126 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) [2021-12-15 21:35:50,128 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-15 21:35:50,165 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-15 21:35:50,165 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-15 21:35:50,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-15 21:35:50,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-15 21:35:50,229 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 21:35:50,230 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-15 21:35:50,272 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 21:35:50,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [919879307] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-15 21:35:50,272 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-15 21:35:50,272 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2021-12-15 21:35:50,272 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692167262] [2021-12-15 21:35:50,273 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-15 21:35:50,273 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-15 21:35:50,273 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 21:35:50,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-15 21:35:50,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=90, Unknown=0, NotChecked=0, Total=156 [2021-12-15 21:35:50,274 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 13 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:35:50,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 21:35:50,317 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2021-12-15 21:35:50,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-15 21:35:50,317 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 13 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-12-15 21:35:50,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-15 21:35:50,318 INFO L225 Difference]: With dead ends: 38 [2021-12-15 21:35:50,318 INFO L226 Difference]: Without dead ends: 22 [2021-12-15 21:35:50,318 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=76, Invalid=106, Unknown=0, NotChecked=0, Total=182 [2021-12-15 21:35:50,319 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 32 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-15 21:35:50,319 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 49 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-15 21:35:50,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-12-15 21:35:50,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-12-15 21:35:50,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.1) internal successors, (22), 20 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:35:50,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2021-12-15 21:35:50,326 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2021-12-15 21:35:50,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-15 21:35:50,326 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2021-12-15 21:35:50,327 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 13 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:35:50,327 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2021-12-15 21:35:50,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-12-15 21:35:50,328 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 21:35:50,328 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-12-15 21:35:50,367 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-15 21:35:50,545 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 21:35:50,545 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 21:35:50,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 21:35:50,546 INFO L85 PathProgramCache]: Analyzing trace with hash -1704999301, now seen corresponding path program 3 times [2021-12-15 21:35:50,546 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 21:35:50,546 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1169045351] [2021-12-15 21:35:50,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 21:35:50,546 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 21:35:50,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 21:35:50,725 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 21:35:50,725 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 21:35:50,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1169045351] [2021-12-15 21:35:50,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1169045351] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-15 21:35:50,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [672916842] [2021-12-15 21:35:50,726 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-15 21:35:50,726 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 21:35:50,726 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-15 21:35:50,727 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) [2021-12-15 21:35:50,728 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-15 21:35:50,765 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-12-15 21:35:50,766 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-15 21:35:50,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-15 21:35:50,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-15 21:35:50,794 INFO L354 Elim1Store]: treesize reduction 39, result has 22.0 percent of original size [2021-12-15 21:35:50,794 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-12-15 21:35:50,860 INFO L354 Elim1Store]: treesize reduction 113, result has 26.6 percent of original size [2021-12-15 21:35:50,860 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 38 treesize of output 58 [2021-12-15 21:35:51,302 INFO L354 Elim1Store]: treesize reduction 14, result has 17.6 percent of original size [2021-12-15 21:35:51,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 20 [2021-12-15 21:35:51,351 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 21:35:51,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-15 21:36:03,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 39 [2021-12-15 21:36:03,171 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 1912 treesize of output 1888 [2021-12-15 21:36:05,628 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 21:36:05,628 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [672916842] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-15 21:36:05,628 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-15 21:36:05,628 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 12] total 30 [2021-12-15 21:36:05,629 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [909395929] [2021-12-15 21:36:05,629 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-15 21:36:05,629 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-12-15 21:36:05,629 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 21:36:05,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-12-15 21:36:05,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=695, Unknown=7, NotChecked=0, Total=870 [2021-12-15 21:36:05,630 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 30 states, 30 states have (on average 1.7666666666666666) internal successors, (53), 30 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:36:10,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 21:36:10,825 INFO L93 Difference]: Finished difference Result 59 states and 64 transitions. [2021-12-15 21:36:10,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-12-15 21:36:10,826 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.7666666666666666) internal successors, (53), 30 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-12-15 21:36:10,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-15 21:36:10,826 INFO L225 Difference]: With dead ends: 59 [2021-12-15 21:36:10,826 INFO L226 Difference]: Without dead ends: 29 [2021-12-15 21:36:10,827 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 26 SyntacticMatches, 5 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 624 ImplicationChecksByTransitivity, 17.0s TimeCoverageRelationStatistics Valid=494, Invalid=1947, Unknown=9, NotChecked=0, Total=2450 [2021-12-15 21:36:10,827 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 91 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 49 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-15 21:36:10,828 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 96 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 30 Invalid, 0 Unknown, 49 Unchecked, 0.0s Time] [2021-12-15 21:36:10,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-12-15 21:36:10,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-12-15 21:36:10,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 28 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:36:10,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2021-12-15 21:36:10,830 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 20 [2021-12-15 21:36:10,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-15 21:36:10,830 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2021-12-15 21:36:10,830 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.7666666666666666) internal successors, (53), 30 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:36:10,830 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2021-12-15 21:36:10,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-12-15 21:36:10,831 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 21:36:10,831 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-12-15 21:36:10,846 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-15 21:36:11,031 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 21:36:11,032 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 21:36:11,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 21:36:11,032 INFO L85 PathProgramCache]: Analyzing trace with hash 1436116461, now seen corresponding path program 4 times [2021-12-15 21:36:11,032 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 21:36:11,032 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2035777922] [2021-12-15 21:36:11,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 21:36:11,033 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 21:36:11,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 21:36:11,334 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 9 proven. 24 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-15 21:36:11,334 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 21:36:11,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2035777922] [2021-12-15 21:36:11,334 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2035777922] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-15 21:36:11,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1214737903] [2021-12-15 21:36:11,335 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-15 21:36:11,335 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 21:36:11,335 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-15 21:36:11,336 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) [2021-12-15 21:36:11,337 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-15 21:36:11,370 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-15 21:36:11,370 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-15 21:36:11,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 26 conjunts are in the unsatisfiable core [2021-12-15 21:36:11,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-15 21:36:11,390 INFO L354 Elim1Store]: treesize reduction 39, result has 22.0 percent of original size [2021-12-15 21:36:11,390 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-12-15 21:36:11,433 INFO L354 Elim1Store]: treesize reduction 130, result has 15.6 percent of original size [2021-12-15 21:36:11,433 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 38 treesize of output 41 [2021-12-15 21:36:11,465 INFO L354 Elim1Store]: treesize reduction 130, result has 15.6 percent of original size [2021-12-15 21:36:11,466 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 38 treesize of output 41 [2021-12-15 21:36:11,717 INFO L354 Elim1Store]: treesize reduction 12, result has 20.0 percent of original size [2021-12-15 21:36:11,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 12 [2021-12-15 21:36:11,737 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 9 proven. 24 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-15 21:36:11,737 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-15 21:36:11,950 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 9 proven. 24 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-15 21:36:11,950 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1214737903] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-15 21:36:11,950 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-15 21:36:11,950 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 32 [2021-12-15 21:36:11,950 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917853247] [2021-12-15 21:36:11,950 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-15 21:36:11,951 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-12-15 21:36:11,951 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 21:36:11,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-12-15 21:36:11,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=789, Unknown=0, NotChecked=0, Total=992 [2021-12-15 21:36:11,952 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand has 32 states, 32 states have (on average 2.3125) internal successors, (74), 32 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:36:12,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 21:36:12,290 INFO L93 Difference]: Finished difference Result 38 states and 39 transitions. [2021-12-15 21:36:12,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-12-15 21:36:12,291 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.3125) internal successors, (74), 32 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-12-15 21:36:12,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-15 21:36:12,291 INFO L225 Difference]: With dead ends: 38 [2021-12-15 21:36:12,291 INFO L226 Difference]: Without dead ends: 36 [2021-12-15 21:36:12,292 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 633 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=441, Invalid=1539, Unknown=0, NotChecked=0, Total=1980 [2021-12-15 21:36:12,293 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 121 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 59 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-15 21:36:12,293 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [121 Valid, 75 Invalid, 262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 118 Invalid, 0 Unknown, 59 Unchecked, 0.1s Time] [2021-12-15 21:36:12,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-12-15 21:36:12,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 33. [2021-12-15 21:36:12,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.0625) internal successors, (34), 32 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:36:12,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2021-12-15 21:36:12,299 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 28 [2021-12-15 21:36:12,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-15 21:36:12,299 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2021-12-15 21:36:12,299 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.3125) internal successors, (74), 32 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:36:12,299 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2021-12-15 21:36:12,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-12-15 21:36:12,300 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 21:36:12,300 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-12-15 21:36:12,318 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-15 21:36:12,516 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 21:36:12,516 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 21:36:12,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 21:36:12,516 INFO L85 PathProgramCache]: Analyzing trace with hash -2041873501, now seen corresponding path program 5 times [2021-12-15 21:36:12,516 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 21:36:12,517 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1174104338] [2021-12-15 21:36:12,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 21:36:12,517 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 21:36:12,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 21:36:12,685 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 4 proven. 44 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 21:36:12,685 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 21:36:12,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1174104338] [2021-12-15 21:36:12,685 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1174104338] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-15 21:36:12,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2006388603] [2021-12-15 21:36:12,686 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-15 21:36:12,686 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 21:36:12,686 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-15 21:36:12,687 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) [2021-12-15 21:36:12,688 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-15 21:36:12,746 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-12-15 21:36:12,746 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-15 21:36:12,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 32 conjunts are in the unsatisfiable core [2021-12-15 21:36:12,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-15 21:36:12,763 INFO L354 Elim1Store]: treesize reduction 39, result has 22.0 percent of original size [2021-12-15 21:36:12,763 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-12-15 21:36:12,785 INFO L354 Elim1Store]: treesize reduction 130, result has 15.6 percent of original size [2021-12-15 21:36:12,785 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 38 treesize of output 41 [2021-12-15 21:36:12,803 INFO L354 Elim1Store]: treesize reduction 130, result has 15.6 percent of original size [2021-12-15 21:36:12,803 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 38 treesize of output 41 [2021-12-15 21:36:12,823 INFO L354 Elim1Store]: treesize reduction 130, result has 15.6 percent of original size [2021-12-15 21:36:12,823 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 38 treesize of output 41 [2021-12-15 21:36:12,980 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-12-15 21:36:12,996 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 4 proven. 44 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 21:36:12,996 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-15 21:36:13,256 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 4 proven. 44 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 21:36:13,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2006388603] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-15 21:36:13,257 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-15 21:36:13,257 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 15, 15] total 25 [2021-12-15 21:36:13,257 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065866015] [2021-12-15 21:36:13,257 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-15 21:36:13,258 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-12-15 21:36:13,258 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 21:36:13,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-12-15 21:36:13,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=470, Unknown=0, NotChecked=0, Total=600 [2021-12-15 21:36:13,259 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand has 25 states, 25 states have (on average 2.6) internal successors, (65), 25 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:36:15,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 21:36:15,673 INFO L93 Difference]: Finished difference Result 42 states and 43 transitions. [2021-12-15 21:36:15,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-12-15 21:36:15,673 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.6) internal successors, (65), 25 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-12-15 21:36:15,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-15 21:36:15,675 INFO L225 Difference]: With dead ends: 42 [2021-12-15 21:36:15,675 INFO L226 Difference]: Without dead ends: 40 [2021-12-15 21:36:15,676 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 55 SyntacticMatches, 4 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 418 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=342, Invalid=1297, Unknown=1, NotChecked=0, Total=1640 [2021-12-15 21:36:15,676 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 70 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 327 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 82 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-15 21:36:15,676 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 104 Invalid, 327 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 189 Invalid, 0 Unknown, 82 Unchecked, 0.1s Time] [2021-12-15 21:36:15,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-12-15 21:36:15,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 37. [2021-12-15 21:36:15,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.0555555555555556) internal successors, (38), 36 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:36:15,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2021-12-15 21:36:15,680 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 32 [2021-12-15 21:36:15,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-15 21:36:15,680 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2021-12-15 21:36:15,680 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.6) internal successors, (65), 25 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:36:15,681 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2021-12-15 21:36:15,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-12-15 21:36:15,681 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 21:36:15,681 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-12-15 21:36:15,697 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-15 21:36:15,883 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 21:36:15,883 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 21:36:15,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 21:36:15,884 INFO L85 PathProgramCache]: Analyzing trace with hash 1072678489, now seen corresponding path program 6 times [2021-12-15 21:36:15,884 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 21:36:15,884 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1340115475] [2021-12-15 21:36:15,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 21:36:15,884 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 21:36:15,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 21:36:15,969 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 33 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 21:36:15,970 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 21:36:15,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1340115475] [2021-12-15 21:36:15,970 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1340115475] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-15 21:36:15,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [89310706] [2021-12-15 21:36:15,970 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-15 21:36:15,970 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 21:36:15,970 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-15 21:36:15,971 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) [2021-12-15 21:36:15,972 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-15 21:36:16,023 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-12-15 21:36:16,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-15 21:36:16,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-15 21:36:16,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-15 21:36:16,160 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 50 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 21:36:16,160 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-15 21:36:16,273 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 50 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 21:36:16,273 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [89310706] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-15 21:36:16,274 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-15 21:36:16,274 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14, 14] total 22 [2021-12-15 21:36:16,274 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1880931959] [2021-12-15 21:36:16,274 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-15 21:36:16,275 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-12-15 21:36:16,275 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 21:36:16,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-12-15 21:36:16,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=273, Unknown=0, NotChecked=0, Total=462 [2021-12-15 21:36:16,276 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand has 22 states, 22 states have (on average 3.3181818181818183) internal successors, (73), 22 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:36:16,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 21:36:16,356 INFO L93 Difference]: Finished difference Result 68 states and 70 transitions. [2021-12-15 21:36:16,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-12-15 21:36:16,356 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.3181818181818183) internal successors, (73), 22 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-12-15 21:36:16,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-15 21:36:16,357 INFO L225 Difference]: With dead ends: 68 [2021-12-15 21:36:16,357 INFO L226 Difference]: Without dead ends: 40 [2021-12-15 21:36:16,357 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=205, Invalid=301, Unknown=0, NotChecked=0, Total=506 [2021-12-15 21:36:16,358 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 47 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-15 21:36:16,358 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 114 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-15 21:36:16,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-12-15 21:36:16,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2021-12-15 21:36:16,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 38 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:36:16,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2021-12-15 21:36:16,364 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2021-12-15 21:36:16,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-15 21:36:16,364 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2021-12-15 21:36:16,364 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 3.3181818181818183) internal successors, (73), 22 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:36:16,364 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2021-12-15 21:36:16,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-12-15 21:36:16,365 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 21:36:16,365 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-12-15 21:36:16,382 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-15 21:36:16,565 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 21:36:16,565 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 21:36:16,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 21:36:16,566 INFO L85 PathProgramCache]: Analyzing trace with hash 811766135, now seen corresponding path program 7 times [2021-12-15 21:36:16,566 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 21:36:16,566 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [29255881] [2021-12-15 21:36:16,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 21:36:16,566 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 21:36:16,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 21:36:16,904 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 5 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 21:36:16,904 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 21:36:16,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [29255881] [2021-12-15 21:36:16,904 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [29255881] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-15 21:36:16,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1773036030] [2021-12-15 21:36:16,904 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-15 21:36:16,904 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 21:36:16,905 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-15 21:36:16,905 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) [2021-12-15 21:36:16,906 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-15 21:36:16,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 21:36:16,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 38 conjunts are in the unsatisfiable core [2021-12-15 21:36:16,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-15 21:36:16,978 INFO L354 Elim1Store]: treesize reduction 39, result has 22.0 percent of original size [2021-12-15 21:36:16,978 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-12-15 21:36:17,009 INFO L354 Elim1Store]: treesize reduction 130, result has 15.6 percent of original size [2021-12-15 21:36:17,010 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 38 treesize of output 41 [2021-12-15 21:36:17,040 INFO L354 Elim1Store]: treesize reduction 130, result has 15.6 percent of original size [2021-12-15 21:36:17,041 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 38 treesize of output 41 [2021-12-15 21:36:17,072 INFO L354 Elim1Store]: treesize reduction 130, result has 15.6 percent of original size [2021-12-15 21:36:17,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 38 treesize of output 41 [2021-12-15 21:36:17,103 INFO L354 Elim1Store]: treesize reduction 130, result has 15.6 percent of original size [2021-12-15 21:36:17,103 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 38 treesize of output 41 [2021-12-15 21:36:17,669 INFO L354 Elim1Store]: treesize reduction 12, result has 20.0 percent of original size [2021-12-15 21:36:17,669 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 12 [2021-12-15 21:36:17,689 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 5 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 21:36:17,689 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-15 21:36:18,066 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 5 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 21:36:18,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1773036030] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-15 21:36:18,066 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-15 21:36:18,066 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 42 [2021-12-15 21:36:18,066 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117640510] [2021-12-15 21:36:18,066 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-15 21:36:18,067 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-12-15 21:36:18,067 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 21:36:18,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-12-15 21:36:18,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=1472, Unknown=0, NotChecked=0, Total=1722 [2021-12-15 21:36:18,068 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 42 states, 42 states have (on average 2.5238095238095237) internal successors, (106), 42 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:36:20,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 21:36:20,727 INFO L93 Difference]: Finished difference Result 48 states and 49 transitions. [2021-12-15 21:36:20,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-12-15 21:36:20,728 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.5238095238095237) internal successors, (106), 42 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2021-12-15 21:36:20,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-15 21:36:20,728 INFO L225 Difference]: With dead ends: 48 [2021-12-15 21:36:20,728 INFO L226 Difference]: Without dead ends: 46 [2021-12-15 21:36:20,729 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 55 SyntacticMatches, 7 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1469 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=812, Invalid=3476, Unknown=2, NotChecked=0, Total=4290 [2021-12-15 21:36:20,730 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 130 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 474 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 112 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-15 21:36:20,730 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [130 Valid, 147 Invalid, 474 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 268 Invalid, 0 Unknown, 112 Unchecked, 0.2s Time] [2021-12-15 21:36:20,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-12-15 21:36:20,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 43. [2021-12-15 21:36:20,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 42 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:36:20,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2021-12-15 21:36:20,733 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 38 [2021-12-15 21:36:20,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-15 21:36:20,734 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2021-12-15 21:36:20,734 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 2.5238095238095237) internal successors, (106), 42 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:36:20,734 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2021-12-15 21:36:20,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-12-15 21:36:20,734 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 21:36:20,734 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-12-15 21:36:20,756 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-12-15 21:36:20,943 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 21:36:20,944 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 21:36:20,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 21:36:20,944 INFO L85 PathProgramCache]: Analyzing trace with hash 975163949, now seen corresponding path program 8 times [2021-12-15 21:36:20,944 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 21:36:20,944 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [797296803] [2021-12-15 21:36:20,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 21:36:20,944 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 21:36:20,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 21:36:21,039 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 51 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 21:36:21,039 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 21:36:21,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [797296803] [2021-12-15 21:36:21,039 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [797296803] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-15 21:36:21,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1288794697] [2021-12-15 21:36:21,039 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-15 21:36:21,039 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 21:36:21,040 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-15 21:36:21,040 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-15 21:36:21,041 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-15 21:36:21,089 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-15 21:36:21,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-15 21:36:21,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 15 conjunts are in the unsatisfiable core [2021-12-15 21:36:21,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-15 21:36:21,256 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 72 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 21:36:21,256 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-15 21:36:21,396 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 72 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 21:36:21,396 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1288794697] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-15 21:36:21,396 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-15 21:36:21,397 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16, 16] total 25 [2021-12-15 21:36:21,397 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [470082655] [2021-12-15 21:36:21,397 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-15 21:36:21,397 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-12-15 21:36:21,397 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 21:36:21,398 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-12-15 21:36:21,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=244, Invalid=356, Unknown=0, NotChecked=0, Total=600 [2021-12-15 21:36:21,398 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand has 25 states, 25 states have (on average 3.4) internal successors, (85), 25 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:36:21,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 21:36:21,503 INFO L93 Difference]: Finished difference Result 78 states and 80 transitions. [2021-12-15 21:36:21,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-12-15 21:36:21,504 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.4) internal successors, (85), 25 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-12-15 21:36:21,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-15 21:36:21,506 INFO L225 Difference]: With dead ends: 78 [2021-12-15 21:36:21,506 INFO L226 Difference]: Without dead ends: 46 [2021-12-15 21:36:21,507 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 74 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 278 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=262, Invalid=388, Unknown=0, NotChecked=0, Total=650 [2021-12-15 21:36:21,507 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 54 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-15 21:36:21,507 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 90 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 135 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-15 21:36:21,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-12-15 21:36:21,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2021-12-15 21:36:21,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.0454545454545454) internal successors, (46), 44 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:36:21,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2021-12-15 21:36:21,512 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 42 [2021-12-15 21:36:21,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-15 21:36:21,513 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2021-12-15 21:36:21,513 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 3.4) internal successors, (85), 25 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 21:36:21,513 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2021-12-15 21:36:21,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-12-15 21:36:21,514 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 21:36:21,514 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2021-12-15 21:36:21,530 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-12-15 21:36:21,719 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-12-15 21:36:21,719 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 21:36:21,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 21:36:21,720 INFO L85 PathProgramCache]: Analyzing trace with hash 1359564491, now seen corresponding path program 9 times [2021-12-15 21:36:21,720 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 21:36:21,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1208903108] [2021-12-15 21:36:21,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 21:36:21,720 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 21:36:21,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 21:36:21,884 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 6 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 21:36:21,884 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 21:36:21,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1208903108] [2021-12-15 21:36:21,885 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1208903108] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-15 21:36:21,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [126772395] [2021-12-15 21:36:21,885 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-15 21:36:21,885 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 21:36:21,885 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-15 21:36:21,886 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-15 21:36:21,886 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-15 21:36:21,970 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-12-15 21:36:21,970 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-15 21:36:21,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 35 conjunts are in the unsatisfiable core [2021-12-15 21:36:21,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-15 21:36:22,012 INFO L354 Elim1Store]: treesize reduction 39, result has 22.0 percent of original size [2021-12-15 21:36:22,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-12-15 21:36:22,082 INFO L354 Elim1Store]: treesize reduction 113, result has 26.6 percent of original size [2021-12-15 21:36:22,082 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 38 treesize of output 58 [2021-12-15 21:36:22,217 INFO L354 Elim1Store]: treesize reduction 113, result has 26.6 percent of original size [2021-12-15 21:36:22,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 50 treesize of output 70 [2021-12-15 21:36:22,336 INFO L354 Elim1Store]: treesize reduction 113, result has 26.6 percent of original size [2021-12-15 21:36:22,336 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 50 treesize of output 70 [2021-12-15 21:36:22,455 INFO L354 Elim1Store]: treesize reduction 113, result has 26.6 percent of original size [2021-12-15 21:36:22,455 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 50 treesize of output 70 [2021-12-15 21:36:22,584 INFO L354 Elim1Store]: treesize reduction 113, result has 26.6 percent of original size [2021-12-15 21:36:22,584 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 50 treesize of output 70 [2021-12-15 21:36:23,432 INFO L354 Elim1Store]: treesize reduction 14, result has 17.6 percent of original size [2021-12-15 21:36:23,434 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 20 [2021-12-15 21:36:23,478 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 45 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 21:36:23,478 INFO L328 TraceCheckSpWp]: Computing backward predicates...