./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version ae007674 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/list-ext3-properties/sll_of_sll_nondet_append-2.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 68e1c5cf050539b3ee8f058d38ff7af5aea2a400d05e41e0185e4509f45301e0 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-ae00767 [2021-12-27 23:55:53,580 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-27 23:55:53,582 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-27 23:55:53,612 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-27 23:55:53,612 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-27 23:55:53,615 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-27 23:55:53,616 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-27 23:55:53,620 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-27 23:55:53,621 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-27 23:55:53,625 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-27 23:55:53,625 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-27 23:55:53,626 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-27 23:55:53,627 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-27 23:55:53,628 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-27 23:55:53,629 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-27 23:55:53,633 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-27 23:55:53,634 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-27 23:55:53,634 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-27 23:55:53,636 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-27 23:55:53,640 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-27 23:55:53,641 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-27 23:55:53,642 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-27 23:55:53,642 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-27 23:55:53,644 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-27 23:55:53,648 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-27 23:55:53,648 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-27 23:55:53,649 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-27 23:55:53,650 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-27 23:55:53,650 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-27 23:55:53,658 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-27 23:55:53,658 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-27 23:55:53,659 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-27 23:55:53,660 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-27 23:55:53,661 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-27 23:55:53,662 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-27 23:55:53,662 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-27 23:55:53,662 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-27 23:55:53,662 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-27 23:55:53,663 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-27 23:55:53,664 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-27 23:55:53,664 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-27 23:55:53,667 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-27 23:55:53,694 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-27 23:55:53,695 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-27 23:55:53,696 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-27 23:55:53,696 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-27 23:55:53,696 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-27 23:55:53,697 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-27 23:55:53,697 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-27 23:55:53,698 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-27 23:55:53,698 INFO L138 SettingsManager]: * Use SBE=true [2021-12-27 23:55:53,698 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-27 23:55:53,699 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-27 23:55:53,699 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-27 23:55:53,699 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-27 23:55:53,699 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-27 23:55:53,699 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-27 23:55:53,700 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-27 23:55:53,700 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-27 23:55:53,700 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-27 23:55:53,700 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-27 23:55:53,700 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-27 23:55:53,700 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-27 23:55:53,700 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-27 23:55:53,701 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-27 23:55:53,701 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-27 23:55:53,701 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-27 23:55:53,701 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-27 23:55:53,701 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-27 23:55:53,701 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-27 23:55:53,702 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-27 23:55:53,702 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-27 23:55:53,702 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-27 23:55:53,702 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-27 23:55:53,702 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-27 23:55:53,703 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 68e1c5cf050539b3ee8f058d38ff7af5aea2a400d05e41e0185e4509f45301e0 [2021-12-27 23:55:53,976 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-27 23:55:53,990 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-27 23:55:53,992 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-27 23:55:53,993 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-27 23:55:53,994 INFO L275 PluginConnector]: CDTParser initialized [2021-12-27 23:55:53,995 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-2.i [2021-12-27 23:55:54,037 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/987d8349d/d5342cd415f146799f0a661576ef932d/FLAG8b6bad613 [2021-12-27 23:55:54,500 INFO L306 CDTParser]: Found 1 translation units. [2021-12-27 23:55:54,500 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-2.i [2021-12-27 23:55:54,512 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/987d8349d/d5342cd415f146799f0a661576ef932d/FLAG8b6bad613 [2021-12-27 23:55:54,524 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/987d8349d/d5342cd415f146799f0a661576ef932d [2021-12-27 23:55:54,526 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-27 23:55:54,527 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-27 23:55:54,529 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-27 23:55:54,529 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-27 23:55:54,532 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-27 23:55:54,532 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.12 11:55:54" (1/1) ... [2021-12-27 23:55:54,533 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3b1740dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 11:55:54, skipping insertion in model container [2021-12-27 23:55:54,533 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.12 11:55:54" (1/1) ... [2021-12-27 23:55:54,537 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-27 23:55:54,571 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-27 23:55:54,812 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/list-ext3-properties/sll_of_sll_nondet_append-2.i[25013,25026] [2021-12-27 23:55:54,817 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-27 23:55:54,824 INFO L203 MainTranslator]: Completed pre-run [2021-12-27 23:55:54,867 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/list-ext3-properties/sll_of_sll_nondet_append-2.i[25013,25026] [2021-12-27 23:55:54,867 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-27 23:55:54,888 INFO L208 MainTranslator]: Completed translation [2021-12-27 23:55:54,889 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 11:55:54 WrapperNode [2021-12-27 23:55:54,889 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-27 23:55:54,890 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-27 23:55:54,890 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-27 23:55:54,891 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-27 23:55:54,895 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 11:55:54" (1/1) ... [2021-12-27 23:55:54,924 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 11:55:54" (1/1) ... [2021-12-27 23:55:54,940 INFO L137 Inliner]: procedures = 129, calls = 40, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 180 [2021-12-27 23:55:54,941 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-27 23:55:54,941 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-27 23:55:54,942 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-27 23:55:54,942 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-27 23:55:54,949 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 11:55:54" (1/1) ... [2021-12-27 23:55:54,949 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 11:55:54" (1/1) ... [2021-12-27 23:55:54,955 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 11:55:54" (1/1) ... [2021-12-27 23:55:54,955 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 11:55:54" (1/1) ... [2021-12-27 23:55:54,965 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 11:55:54" (1/1) ... [2021-12-27 23:55:54,969 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 11:55:54" (1/1) ... [2021-12-27 23:55:54,970 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 11:55:54" (1/1) ... [2021-12-27 23:55:54,972 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-27 23:55:54,976 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-27 23:55:54,976 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-27 23:55:54,976 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-27 23:55:54,977 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 11:55:54" (1/1) ... [2021-12-27 23:55:54,983 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-27 23:55:54,992 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 23:55:55,001 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-27 23:55:55,006 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 [2021-12-27 23:55:55,037 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2021-12-27 23:55:55,038 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2021-12-27 23:55:55,038 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-27 23:55:55,038 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-27 23:55:55,038 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-27 23:55:55,038 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-12-27 23:55:55,038 INFO L130 BoogieDeclarations]: Found specification of procedure sll_append [2021-12-27 23:55:55,038 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_append [2021-12-27 23:55:55,040 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-12-27 23:55:55,040 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-27 23:55:55,040 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-12-27 23:55:55,040 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-27 23:55:55,041 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-27 23:55:55,041 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-27 23:55:55,157 INFO L234 CfgBuilder]: Building ICFG [2021-12-27 23:55:55,172 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-27 23:55:55,206 INFO L766 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2021-12-27 23:55:55,381 INFO L275 CfgBuilder]: Performing block encoding [2021-12-27 23:55:55,387 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-27 23:55:55,388 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2021-12-27 23:55:55,389 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.12 11:55:55 BoogieIcfgContainer [2021-12-27 23:55:55,389 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-27 23:55:55,391 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-27 23:55:55,391 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-27 23:55:55,393 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-27 23:55:55,393 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.12 11:55:54" (1/3) ... [2021-12-27 23:55:55,394 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6bb03f66 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.12 11:55:55, skipping insertion in model container [2021-12-27 23:55:55,394 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 11:55:54" (2/3) ... [2021-12-27 23:55:55,394 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6bb03f66 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.12 11:55:55, skipping insertion in model container [2021-12-27 23:55:55,394 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.12 11:55:55" (3/3) ... [2021-12-27 23:55:55,395 INFO L111 eAbstractionObserver]: Analyzing ICFG sll_of_sll_nondet_append-2.i [2021-12-27 23:55:55,398 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-27 23:55:55,398 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-27 23:55:55,424 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-27 23:55:55,428 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 [2021-12-27 23:55:55,429 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-27 23:55:55,438 INFO L276 IsEmpty]: Start isEmpty. Operand has 50 states, 43 states have (on average 1.627906976744186) internal successors, (70), 45 states have internal predecessors, (70), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-27 23:55:55,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-12-27 23:55:55,442 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 23:55:55,442 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 23:55:55,443 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 23:55:55,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 23:55:55,446 INFO L85 PathProgramCache]: Analyzing trace with hash 284890451, now seen corresponding path program 1 times [2021-12-27 23:55:55,451 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 23:55:55,452 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [68989218] [2021-12-27 23:55:55,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 23:55:55,452 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 23:55:55,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:55:55,567 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-27 23:55:55,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:55:55,585 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 23:55:55,585 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 23:55:55,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [68989218] [2021-12-27 23:55:55,586 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [68989218] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-27 23:55:55,586 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-27 23:55:55,586 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-27 23:55:55,588 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1766386083] [2021-12-27 23:55:55,588 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-27 23:55:55,590 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-27 23:55:55,591 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 23:55:55,606 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-27 23:55:55,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-27 23:55:55,608 INFO L87 Difference]: Start difference. First operand has 50 states, 43 states have (on average 1.627906976744186) internal successors, (70), 45 states have internal predecessors, (70), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 2 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-27 23:55:55,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 23:55:55,651 INFO L93 Difference]: Finished difference Result 98 states and 152 transitions. [2021-12-27 23:55:55,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-27 23:55:55,653 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 2 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-12-27 23:55:55,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 23:55:55,657 INFO L225 Difference]: With dead ends: 98 [2021-12-27 23:55:55,657 INFO L226 Difference]: Without dead ends: 38 [2021-12-27 23:55:55,659 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-27 23:55:55,661 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 2 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-27 23:55:55,662 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 105 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-27 23:55:55,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-12-27 23:55:55,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-12-27 23:55:55,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 34 states have internal predecessors, (46), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-27 23:55:55,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 50 transitions. [2021-12-27 23:55:55,685 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 50 transitions. Word has length 18 [2021-12-27 23:55:55,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 23:55:55,686 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 50 transitions. [2021-12-27 23:55:55,686 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 2 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-27 23:55:55,686 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 50 transitions. [2021-12-27 23:55:55,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-12-27 23:55:55,687 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 23:55:55,687 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 23:55:55,687 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-27 23:55:55,688 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 23:55:55,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 23:55:55,688 INFO L85 PathProgramCache]: Analyzing trace with hash 373470279, now seen corresponding path program 1 times [2021-12-27 23:55:55,688 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 23:55:55,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1750184450] [2021-12-27 23:55:55,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 23:55:55,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 23:55:55,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:55:55,748 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-27 23:55:55,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:55:55,787 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 23:55:55,787 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 23:55:55,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1750184450] [2021-12-27 23:55:55,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1750184450] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-27 23:55:55,788 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-27 23:55:55,788 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-27 23:55:55,788 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [661401093] [2021-12-27 23:55:55,788 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-27 23:55:55,789 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-27 23:55:55,789 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 23:55:55,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-27 23:55:55,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-27 23:55:55,790 INFO L87 Difference]: Start difference. First operand 38 states and 50 transitions. Second operand has 4 states, 4 states have (on average 4.0) internal successors, (16), 3 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-27 23:55:55,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 23:55:55,829 INFO L93 Difference]: Finished difference Result 74 states and 98 transitions. [2021-12-27 23:55:55,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-27 23:55:55,830 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 3 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-12-27 23:55:55,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 23:55:55,831 INFO L225 Difference]: With dead ends: 74 [2021-12-27 23:55:55,831 INFO L226 Difference]: Without dead ends: 45 [2021-12-27 23:55:55,831 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-27 23:55:55,832 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 7 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-27 23:55:55,833 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 115 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-27 23:55:55,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-12-27 23:55:55,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 39. [2021-12-27 23:55:55,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 35 states have internal predecessors, (47), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-27 23:55:55,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 51 transitions. [2021-12-27 23:55:55,838 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 51 transitions. Word has length 18 [2021-12-27 23:55:55,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 23:55:55,839 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 51 transitions. [2021-12-27 23:55:55,839 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 3 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-27 23:55:55,839 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 51 transitions. [2021-12-27 23:55:55,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-12-27 23:55:55,840 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 23:55:55,840 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 23:55:55,840 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-27 23:55:55,840 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 23:55:55,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 23:55:55,843 INFO L85 PathProgramCache]: Analyzing trace with hash -1669671981, now seen corresponding path program 1 times [2021-12-27 23:55:55,844 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 23:55:55,844 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1988789147] [2021-12-27 23:55:55,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 23:55:55,844 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 23:55:55,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:55:55,932 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-12-27 23:55:55,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:55:55,949 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-27 23:55:55,949 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 23:55:55,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1988789147] [2021-12-27 23:55:55,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1988789147] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-27 23:55:55,950 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-27 23:55:55,950 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-27 23:55:55,950 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1540581727] [2021-12-27 23:55:55,950 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-27 23:55:55,950 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-27 23:55:55,951 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 23:55:55,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-27 23:55:55,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-27 23:55:55,951 INFO L87 Difference]: Start difference. First operand 39 states and 51 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-27 23:55:56,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 23:55:56,050 INFO L93 Difference]: Finished difference Result 59 states and 78 transitions. [2021-12-27 23:55:56,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-27 23:55:56,050 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-12-27 23:55:56,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 23:55:56,052 INFO L225 Difference]: With dead ends: 59 [2021-12-27 23:55:56,052 INFO L226 Difference]: Without dead ends: 57 [2021-12-27 23:55:56,053 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-27 23:55:56,058 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 57 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-27 23:55:56,059 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 114 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-27 23:55:56,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-12-27 23:55:56,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 41. [2021-12-27 23:55:56,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 37 states have (on average 1.3243243243243243) internal successors, (49), 37 states have internal predecessors, (49), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-27 23:55:56,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 53 transitions. [2021-12-27 23:55:56,079 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 53 transitions. Word has length 23 [2021-12-27 23:55:56,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 23:55:56,080 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 53 transitions. [2021-12-27 23:55:56,082 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-27 23:55:56,082 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 53 transitions. [2021-12-27 23:55:56,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-12-27 23:55:56,083 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 23:55:56,083 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 23:55:56,084 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-12-27 23:55:56,084 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 23:55:56,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 23:55:56,084 INFO L85 PathProgramCache]: Analyzing trace with hash 2019272425, now seen corresponding path program 1 times [2021-12-27 23:55:56,085 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 23:55:56,085 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [688730298] [2021-12-27 23:55:56,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 23:55:56,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 23:55:56,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:55:56,135 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-12-27 23:55:56,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:55:56,145 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-27 23:55:56,146 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 23:55:56,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [688730298] [2021-12-27 23:55:56,146 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [688730298] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-27 23:55:56,146 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-27 23:55:56,146 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-27 23:55:56,146 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607216183] [2021-12-27 23:55:56,146 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-27 23:55:56,147 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-27 23:55:56,147 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 23:55:56,151 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-27 23:55:56,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-27 23:55:56,151 INFO L87 Difference]: Start difference. First operand 41 states and 53 transitions. Second operand has 4 states, 4 states have (on average 6.25) internal successors, (25), 3 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-27 23:55:56,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 23:55:56,192 INFO L93 Difference]: Finished difference Result 56 states and 74 transitions. [2021-12-27 23:55:56,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-27 23:55:56,193 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.25) internal successors, (25), 3 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2021-12-27 23:55:56,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 23:55:56,193 INFO L225 Difference]: With dead ends: 56 [2021-12-27 23:55:56,194 INFO L226 Difference]: Without dead ends: 44 [2021-12-27 23:55:56,194 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-27 23:55:56,194 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 13 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-27 23:55:56,195 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 113 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-27 23:55:56,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-12-27 23:55:56,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2021-12-27 23:55:56,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 38 states have (on average 1.3157894736842106) internal successors, (50), 38 states have internal predecessors, (50), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-27 23:55:56,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 54 transitions. [2021-12-27 23:55:56,206 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 54 transitions. Word has length 27 [2021-12-27 23:55:56,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 23:55:56,206 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 54 transitions. [2021-12-27 23:55:56,206 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.25) internal successors, (25), 3 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-27 23:55:56,206 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 54 transitions. [2021-12-27 23:55:56,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-12-27 23:55:56,207 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 23:55:56,207 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 23:55:56,207 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-12-27 23:55:56,207 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 23:55:56,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 23:55:56,207 INFO L85 PathProgramCache]: Analyzing trace with hash 1738961116, now seen corresponding path program 1 times [2021-12-27 23:55:56,207 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 23:55:56,208 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [429788683] [2021-12-27 23:55:56,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 23:55:56,208 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 23:55:56,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:55:56,250 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-12-27 23:55:56,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:55:56,261 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 23:55:56,262 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 23:55:56,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [429788683] [2021-12-27 23:55:56,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [429788683] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 23:55:56,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1436037082] [2021-12-27 23:55:56,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 23:55:56,262 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 23:55:56,262 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 23:55:56,274 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) [2021-12-27 23:55:56,279 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-27 23:55:56,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:55:56,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-27 23:55:56,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 23:55:56,473 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 23:55:56,474 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 23:55:56,544 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-27 23:55:56,545 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1436037082] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 23:55:56,545 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 23:55:56,545 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 8 [2021-12-27 23:55:56,546 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197112433] [2021-12-27 23:55:56,549 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 23:55:56,550 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-27 23:55:56,550 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 23:55:56,550 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-27 23:55:56,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-12-27 23:55:56,551 INFO L87 Difference]: Start difference. First operand 42 states and 54 transitions. Second operand has 8 states, 8 states have (on average 6.5) internal successors, (52), 7 states have internal predecessors, (52), 1 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-27 23:55:56,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 23:55:56,625 INFO L93 Difference]: Finished difference Result 94 states and 122 transitions. [2021-12-27 23:55:56,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-27 23:55:56,625 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 6.5) internal successors, (52), 7 states have internal predecessors, (52), 1 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 30 [2021-12-27 23:55:56,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 23:55:56,628 INFO L225 Difference]: With dead ends: 94 [2021-12-27 23:55:56,628 INFO L226 Difference]: Without dead ends: 62 [2021-12-27 23:55:56,629 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-12-27 23:55:56,630 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 47 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-27 23:55:56,630 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 140 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-27 23:55:56,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-12-27 23:55:56,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 57. [2021-12-27 23:55:56,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 51 states have (on average 1.3137254901960784) internal successors, (67), 51 states have internal predecessors, (67), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-27 23:55:56,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 75 transitions. [2021-12-27 23:55:56,644 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 75 transitions. Word has length 30 [2021-12-27 23:55:56,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 23:55:56,644 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 75 transitions. [2021-12-27 23:55:56,644 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 6.5) internal successors, (52), 7 states have internal predecessors, (52), 1 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-27 23:55:56,645 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 75 transitions. [2021-12-27 23:55:56,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-12-27 23:55:56,647 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 23:55:56,647 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 23:55:56,677 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-27 23:55:56,863 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 23:55:56,864 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 23:55:56,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 23:55:56,864 INFO L85 PathProgramCache]: Analyzing trace with hash -2109667236, now seen corresponding path program 2 times [2021-12-27 23:55:56,864 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 23:55:56,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1114640431] [2021-12-27 23:55:56,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 23:55:56,864 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 23:55:56,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:55:56,917 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-12-27 23:55:56,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:55:56,948 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 23:55:56,948 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 23:55:56,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1114640431] [2021-12-27 23:55:56,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1114640431] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-27 23:55:56,948 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-27 23:55:56,948 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-27 23:55:56,948 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2104088410] [2021-12-27 23:55:56,948 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-27 23:55:56,949 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-27 23:55:56,949 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 23:55:56,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-27 23:55:56,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-27 23:55:56,949 INFO L87 Difference]: Start difference. First operand 57 states and 75 transitions. Second operand has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-27 23:55:57,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 23:55:57,006 INFO L93 Difference]: Finished difference Result 86 states and 115 transitions. [2021-12-27 23:55:57,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-27 23:55:57,007 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2021-12-27 23:55:57,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 23:55:57,008 INFO L225 Difference]: With dead ends: 86 [2021-12-27 23:55:57,008 INFO L226 Difference]: Without dead ends: 69 [2021-12-27 23:55:57,009 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-12-27 23:55:57,009 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 67 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 195 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-27 23:55:57,009 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 195 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-27 23:55:57,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-12-27 23:55:57,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 67. [2021-12-27 23:55:57,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 60 states have (on average 1.3166666666666667) internal successors, (79), 61 states have internal predecessors, (79), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-12-27 23:55:57,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 90 transitions. [2021-12-27 23:55:57,017 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 90 transitions. Word has length 40 [2021-12-27 23:55:57,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 23:55:57,017 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 90 transitions. [2021-12-27 23:55:57,017 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-27 23:55:57,017 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 90 transitions. [2021-12-27 23:55:57,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-27 23:55:57,018 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 23:55:57,018 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 23:55:57,018 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-12-27 23:55:57,018 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 23:55:57,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 23:55:57,018 INFO L85 PathProgramCache]: Analyzing trace with hash 949868902, now seen corresponding path program 1 times [2021-12-27 23:55:57,019 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 23:55:57,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1109970582] [2021-12-27 23:55:57,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 23:55:57,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 23:55:57,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:55:57,082 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-12-27 23:55:57,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:55:57,117 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 23:55:57,117 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 23:55:57,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1109970582] [2021-12-27 23:55:57,117 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1109970582] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 23:55:57,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [990487858] [2021-12-27 23:55:57,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 23:55:57,118 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 23:55:57,118 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 23:55:57,119 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) [2021-12-27 23:55:57,120 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-27 23:55:57,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:55:57,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 9 conjunts are in the unsatisfiable core [2021-12-27 23:55:57,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 23:55:57,351 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 23:55:57,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 23:55:57,528 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 23:55:57,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [990487858] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 23:55:57,528 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 23:55:57,529 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 14 [2021-12-27 23:55:57,529 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666848840] [2021-12-27 23:55:57,529 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 23:55:57,529 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-12-27 23:55:57,529 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 23:55:57,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-12-27 23:55:57,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-12-27 23:55:57,530 INFO L87 Difference]: Start difference. First operand 67 states and 90 transitions. Second operand has 14 states, 14 states have (on average 3.642857142857143) internal successors, (51), 13 states have internal predecessors, (51), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-27 23:55:57,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 23:55:57,619 INFO L93 Difference]: Finished difference Result 98 states and 132 transitions. [2021-12-27 23:55:57,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-27 23:55:57,620 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.642857142857143) internal successors, (51), 13 states have internal predecessors, (51), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2021-12-27 23:55:57,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 23:55:57,621 INFO L225 Difference]: With dead ends: 98 [2021-12-27 23:55:57,621 INFO L226 Difference]: Without dead ends: 81 [2021-12-27 23:55:57,621 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=249, Unknown=0, NotChecked=0, Total=342 [2021-12-27 23:55:57,621 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 155 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 271 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-27 23:55:57,622 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [159 Valid, 271 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-27 23:55:57,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-12-27 23:55:57,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 70. [2021-12-27 23:55:57,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 63 states have (on average 1.3174603174603174) internal successors, (83), 64 states have internal predecessors, (83), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-12-27 23:55:57,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 94 transitions. [2021-12-27 23:55:57,627 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 94 transitions. Word has length 43 [2021-12-27 23:55:57,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 23:55:57,628 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 94 transitions. [2021-12-27 23:55:57,628 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.642857142857143) internal successors, (51), 13 states have internal predecessors, (51), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-27 23:55:57,628 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 94 transitions. [2021-12-27 23:55:57,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-12-27 23:55:57,629 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 23:55:57,629 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 23:55:57,649 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-27 23:55:57,836 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-12-27 23:55:57,837 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 23:55:57,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 23:55:57,837 INFO L85 PathProgramCache]: Analyzing trace with hash -204999652, now seen corresponding path program 2 times [2021-12-27 23:55:57,837 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 23:55:57,838 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1840885246] [2021-12-27 23:55:57,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 23:55:57,838 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 23:55:57,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:55:57,894 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-12-27 23:55:57,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:55:57,952 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 23:55:57,952 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 23:55:57,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1840885246] [2021-12-27 23:55:57,952 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1840885246] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 23:55:57,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1150975935] [2021-12-27 23:55:57,952 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-27 23:55:57,952 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 23:55:57,952 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 23:55:57,953 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) [2021-12-27 23:55:57,959 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-27 23:55:58,068 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-27 23:55:58,068 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-27 23:55:58,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-27 23:55:58,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 23:55:58,184 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 23:55:58,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 23:55:58,356 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 23:55:58,356 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1150975935] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-27 23:55:58,356 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-27 23:55:58,356 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 15 [2021-12-27 23:55:58,356 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653888170] [2021-12-27 23:55:58,356 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-27 23:55:58,356 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-27 23:55:58,356 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 23:55:58,357 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-27 23:55:58,357 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=158, Unknown=0, NotChecked=0, Total=210 [2021-12-27 23:55:58,357 INFO L87 Difference]: Start difference. First operand 70 states and 94 transitions. Second operand has 15 states, 15 states have (on average 3.3333333333333335) internal successors, (50), 14 states have internal predecessors, (50), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-27 23:55:58,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 23:55:58,475 INFO L93 Difference]: Finished difference Result 110 states and 149 transitions. [2021-12-27 23:55:58,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-27 23:55:58,476 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.3333333333333335) internal successors, (50), 14 states have internal predecessors, (50), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2021-12-27 23:55:58,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 23:55:58,477 INFO L225 Difference]: With dead ends: 110 [2021-12-27 23:55:58,477 INFO L226 Difference]: Without dead ends: 93 [2021-12-27 23:55:58,478 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 84 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=324, Unknown=0, NotChecked=0, Total=462 [2021-12-27 23:55:58,479 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 161 mSDsluCounter, 339 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 381 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-27 23:55:58,479 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [166 Valid, 381 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-27 23:55:58,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-12-27 23:55:58,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 73. [2021-12-27 23:55:58,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 66 states have (on average 1.3181818181818181) internal successors, (87), 67 states have internal predecessors, (87), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-12-27 23:55:58,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 98 transitions. [2021-12-27 23:55:58,486 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 98 transitions. Word has length 46 [2021-12-27 23:55:58,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 23:55:58,486 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 98 transitions. [2021-12-27 23:55:58,486 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 3.3333333333333335) internal successors, (50), 14 states have internal predecessors, (50), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-27 23:55:58,487 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 98 transitions. [2021-12-27 23:55:58,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-12-27 23:55:58,487 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 23:55:58,487 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 23:55:58,507 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-27 23:55:58,703 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 23:55:58,703 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 23:55:58,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 23:55:58,704 INFO L85 PathProgramCache]: Analyzing trace with hash 2088916390, now seen corresponding path program 3 times [2021-12-27 23:55:58,704 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 23:55:58,704 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1168476485] [2021-12-27 23:55:58,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 23:55:58,704 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 23:55:58,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:55:58,911 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-12-27 23:55:58,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:55:59,171 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-12-27 23:55:59,172 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 23:55:59,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1168476485] [2021-12-27 23:55:59,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1168476485] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-27 23:55:59,172 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-27 23:55:59,172 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-12-27 23:55:59,172 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839756940] [2021-12-27 23:55:59,172 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-27 23:55:59,172 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-27 23:55:59,172 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 23:55:59,173 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-27 23:55:59,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=237, Unknown=0, NotChecked=0, Total=272 [2021-12-27 23:55:59,173 INFO L87 Difference]: Start difference. First operand 73 states and 98 transitions. Second operand has 17 states, 17 states have (on average 2.0) internal successors, (34), 15 states have internal predecessors, (34), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-27 23:55:59,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 23:55:59,830 INFO L93 Difference]: Finished difference Result 180 states and 279 transitions. [2021-12-27 23:55:59,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-27 23:55:59,831 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 15 states have internal predecessors, (34), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2021-12-27 23:55:59,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 23:55:59,832 INFO L225 Difference]: With dead ends: 180 [2021-12-27 23:55:59,832 INFO L226 Difference]: Without dead ends: 164 [2021-12-27 23:55:59,833 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=117, Invalid=585, Unknown=0, NotChecked=0, Total=702 [2021-12-27 23:55:59,833 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 126 mSDsluCounter, 403 mSDsCounter, 0 mSdLazyCounter, 655 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 448 SdHoareTripleChecker+Invalid, 677 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 655 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-27 23:55:59,833 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [126 Valid, 448 Invalid, 677 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 655 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-27 23:55:59,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-12-27 23:55:59,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 101. [2021-12-27 23:55:59,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 92 states have (on average 1.315217391304348) internal successors, (121), 94 states have internal predecessors, (121), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2021-12-27 23:55:59,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 139 transitions. [2021-12-27 23:55:59,845 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 139 transitions. Word has length 49 [2021-12-27 23:55:59,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 23:55:59,845 INFO L470 AbstractCegarLoop]: Abstraction has 101 states and 139 transitions. [2021-12-27 23:55:59,845 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 15 states have internal predecessors, (34), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-27 23:55:59,846 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 139 transitions. [2021-12-27 23:55:59,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-12-27 23:55:59,846 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 23:55:59,846 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 23:55:59,846 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-12-27 23:55:59,846 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 23:55:59,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 23:55:59,847 INFO L85 PathProgramCache]: Analyzing trace with hash -1569533394, now seen corresponding path program 1 times [2021-12-27 23:55:59,847 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 23:55:59,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [500831686] [2021-12-27 23:55:59,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 23:55:59,847 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 23:55:59,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:55:59,963 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-12-27 23:55:59,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:56:00,341 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-12-27 23:56:00,341 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 23:56:00,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [500831686] [2021-12-27 23:56:00,341 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [500831686] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 23:56:00,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1145754832] [2021-12-27 23:56:00,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 23:56:00,341 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 23:56:00,341 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 23:56:00,343 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) [2021-12-27 23:56:00,344 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-27 23:56:00,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:56:00,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 98 conjunts are in the unsatisfiable core [2021-12-27 23:56:00,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 23:56:00,497 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-27 23:56:01,083 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-27 23:56:01,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 23:56:01,302 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 17 [2021-12-27 23:56:01,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 23:56:01,314 INFO L353 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-12-27 23:56:01,314 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 58 treesize of output 53 [2021-12-27 23:56:01,411 INFO L353 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-12-27 23:56:01,411 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 69 treesize of output 54 [2021-12-27 23:56:01,434 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2021-12-27 23:56:01,544 INFO L353 Elim1Store]: treesize reduction 32, result has 49.2 percent of original size [2021-12-27 23:56:01,545 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 69 treesize of output 70 [2021-12-27 23:56:01,567 INFO L353 Elim1Store]: treesize reduction 72, result has 24.2 percent of original size [2021-12-27 23:56:01,567 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 34 treesize of output 36 [2021-12-27 23:56:02,558 INFO L353 Elim1Store]: treesize reduction 94, result has 27.1 percent of original size [2021-12-27 23:56:02,558 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 2 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 570 treesize of output 570 [2021-12-27 23:56:02,841 INFO L353 Elim1Store]: treesize reduction 14, result has 17.6 percent of original size [2021-12-27 23:56:02,842 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 2 case distinctions, treesize of input 64 treesize of output 34 [2021-12-27 23:56:02,905 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-27 23:56:02,905 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 100 treesize of output 38 [2021-12-27 23:56:02,918 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 23:56:02,918 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 23:56:03,367 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-27 23:56:03,370 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-27 23:56:03,371 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 16774 treesize of output 16166 [2021-12-27 23:56:04,076 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1145754832] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 23:56:04,076 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-27 23:56:04,076 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 33 [2021-12-27 23:56:04,076 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [41297086] [2021-12-27 23:56:04,077 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-27 23:56:04,077 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-12-27 23:56:04,077 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-27 23:56:04,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-12-27 23:56:04,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=1177, Unknown=0, NotChecked=0, Total=1260 [2021-12-27 23:56:04,078 INFO L87 Difference]: Start difference. First operand 101 states and 139 transitions. Second operand has 33 states, 33 states have (on average 2.0606060606060606) internal successors, (68), 29 states have internal predecessors, (68), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-27 23:56:05,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-27 23:56:05,869 INFO L93 Difference]: Finished difference Result 212 states and 330 transitions. [2021-12-27 23:56:05,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-12-27 23:56:05,869 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.0606060606060606) internal successors, (68), 29 states have internal predecessors, (68), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 50 [2021-12-27 23:56:05,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-27 23:56:05,871 INFO L225 Difference]: With dead ends: 212 [2021-12-27 23:56:05,872 INFO L226 Difference]: Without dead ends: 196 [2021-12-27 23:56:05,873 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 474 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=240, Invalid=3300, Unknown=0, NotChecked=0, Total=3540 [2021-12-27 23:56:05,874 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 69 mSDsluCounter, 1432 mSDsCounter, 0 mSdLazyCounter, 551 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 1495 SdHoareTripleChecker+Invalid, 1022 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 551 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 453 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-27 23:56:05,874 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 1495 Invalid, 1022 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 551 Invalid, 0 Unknown, 453 Unchecked, 0.4s Time] [2021-12-27 23:56:05,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-12-27 23:56:05,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 138. [2021-12-27 23:56:05,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 124 states have (on average 1.314516129032258) internal successors, (163), 127 states have internal predecessors, (163), 9 states have call successors, (9), 1 states have call predecessors, (9), 4 states have return successors, (30), 9 states have call predecessors, (30), 9 states have call successors, (30) [2021-12-27 23:56:05,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 202 transitions. [2021-12-27 23:56:05,894 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 202 transitions. Word has length 50 [2021-12-27 23:56:05,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-27 23:56:05,894 INFO L470 AbstractCegarLoop]: Abstraction has 138 states and 202 transitions. [2021-12-27 23:56:05,895 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.0606060606060606) internal successors, (68), 29 states have internal predecessors, (68), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-27 23:56:05,895 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 202 transitions. [2021-12-27 23:56:05,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-12-27 23:56:05,896 INFO L506 BasicCegarLoop]: Found error trace [2021-12-27 23:56:05,896 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-27 23:56:05,918 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-27 23:56:06,118 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 23:56:06,119 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-27 23:56:06,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-27 23:56:06,119 INFO L85 PathProgramCache]: Analyzing trace with hash 982640294, now seen corresponding path program 2 times [2021-12-27 23:56:06,119 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-27 23:56:06,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [310324091] [2021-12-27 23:56:06,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-27 23:56:06,119 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-27 23:56:06,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:56:06,329 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-12-27 23:56:06,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-27 23:56:06,938 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 23:56:06,938 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-27 23:56:06,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [310324091] [2021-12-27 23:56:06,938 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [310324091] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-27 23:56:06,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1066931355] [2021-12-27 23:56:06,938 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-27 23:56:06,938 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-27 23:56:06,938 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-27 23:56:06,939 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) [2021-12-27 23:56:06,940 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-27 23:56:07,077 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-27 23:56:07,077 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-27 23:56:07,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 126 conjunts are in the unsatisfiable core [2021-12-27 23:56:07,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-27 23:56:07,091 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-27 23:56:07,202 INFO L387 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 5 treesize of output 3 [2021-12-27 23:56:07,522 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-27 23:56:07,708 INFO L353 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-12-27 23:56:07,709 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 52 [2021-12-27 23:56:07,725 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-27 23:56:07,929 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 23:56:07,944 INFO L353 Elim1Store]: treesize reduction 40, result has 27.3 percent of original size [2021-12-27 23:56:07,944 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 94 treesize of output 71 [2021-12-27 23:56:07,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 23:56:07,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 23:56:07,951 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 33 [2021-12-27 23:56:08,065 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 23:56:08,066 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 35 [2021-12-27 23:56:08,084 INFO L353 Elim1Store]: treesize reduction 56, result has 21.1 percent of original size [2021-12-27 23:56:08,084 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 7 case distinctions, treesize of input 142 treesize of output 85 [2021-12-27 23:56:08,259 INFO L353 Elim1Store]: treesize reduction 88, result has 40.9 percent of original size [2021-12-27 23:56:08,259 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 142 treesize of output 124 [2021-12-27 23:56:08,265 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 23:56:08,283 INFO L353 Elim1Store]: treesize reduction 96, result has 23.8 percent of original size [2021-12-27 23:56:08,283 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 41 treesize of output 46 [2021-12-27 23:56:09,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 23:56:09,542 INFO L353 Elim1Store]: treesize reduction 126, result has 21.7 percent of original size [2021-12-27 23:56:09,542 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 2 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 9 case distinctions, treesize of input 660 treesize of output 636 [2021-12-27 23:56:10,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 23:56:10,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-27 23:56:10,298 INFO L353 Elim1Store]: treesize reduction 90, result has 7.2 percent of original size [2021-12-27 23:56:10,298 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 4 disjoint index pairs (out of 15 index pairs), introduced 9 new quantified variables, introduced 7 case distinctions, treesize of input 115 treesize of output 60 [2021-12-27 23:56:10,431 INFO L353 Elim1Store]: treesize reduction 32, result has 34.7 percent of original size [2021-12-27 23:56:10,432 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 8 new quantified variables, introduced 10 case distinctions, treesize of input 238 treesize of output 75 [2021-12-27 23:56:10,450 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-27 23:56:10,450 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-27 23:56:11,361 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-27 23:56:11,362 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-27 23:56:11,379 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-27 23:56:11,386 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-27 23:56:11,425 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-27 23:56:11,426 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-27 23:56:11,427 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-27 23:56:11,428 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-27 23:56:12,181 INFO L353 Elim1Store]: treesize reduction 10053, result has 1.5 percent of original size [2021-12-27 23:56:12,185 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 5 disjoint index pairs (out of 91 index pairs), introduced 16 new quantified variables, introduced 60 case distinctions, treesize of input 909604534 treesize of output 611619546