./Ultimate.py --spec ../sv-benchmarks/c/properties/valid-memsafety.prp --file ../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version e19ca921 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/AutomizerMemDerefMemtrack.xml -i ../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-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 valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 8f9453cad2383b5119b308e041fed5f4a740e7abd43cb8ad7833872af20a8d57 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-e19ca92 [2021-12-22 16:39:24,601 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-22 16:39:24,602 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-22 16:39:24,624 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-22 16:39:24,625 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-22 16:39:24,626 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-22 16:39:24,626 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-22 16:39:24,628 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-22 16:39:24,629 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-22 16:39:24,629 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-22 16:39:24,630 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-22 16:39:24,631 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-22 16:39:24,635 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-22 16:39:24,637 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-22 16:39:24,638 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-22 16:39:24,640 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-22 16:39:24,640 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-22 16:39:24,641 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-22 16:39:24,644 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-22 16:39:24,645 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-22 16:39:24,648 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-22 16:39:24,651 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-22 16:39:24,651 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-22 16:39:24,652 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-22 16:39:24,654 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-22 16:39:24,658 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-22 16:39:24,659 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-22 16:39:24,659 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-22 16:39:24,660 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-22 16:39:24,660 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-22 16:39:24,660 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-22 16:39:24,661 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-22 16:39:24,661 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-22 16:39:24,662 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-22 16:39:24,662 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-22 16:39:24,662 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-22 16:39:24,663 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-22 16:39:24,664 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-22 16:39:24,664 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-22 16:39:24,664 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-22 16:39:24,665 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-22 16:39:24,665 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-12-22 16:39:24,682 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-22 16:39:24,682 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-22 16:39:24,682 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-22 16:39:24,683 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-22 16:39:24,683 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-22 16:39:24,683 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-22 16:39:24,684 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-22 16:39:24,684 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-22 16:39:24,684 INFO L138 SettingsManager]: * Use SBE=true [2021-12-22 16:39:24,684 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-22 16:39:24,684 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-22 16:39:24,684 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-22 16:39:24,684 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-22 16:39:24,684 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-22 16:39:24,684 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-22 16:39:24,684 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-22 16:39:24,684 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-22 16:39:24,684 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-12-22 16:39:24,685 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-22 16:39:24,685 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-22 16:39:24,685 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-22 16:39:24,685 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-22 16:39:24,685 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-22 16:39:24,685 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-22 16:39:24,685 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-22 16:39:24,686 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 16:39:24,686 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-22 16:39:24,686 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-22 16:39:24,686 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-22 16:39:24,686 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-22 16:39:24,686 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-22 16:39:24,686 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8f9453cad2383b5119b308e041fed5f4a740e7abd43cb8ad7833872af20a8d57 [2021-12-22 16:39:24,863 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-22 16:39:24,882 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-22 16:39:24,884 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-22 16:39:24,885 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-22 16:39:24,886 INFO L275 PluginConnector]: CDTParser initialized [2021-12-22 16:39:24,887 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i [2021-12-22 16:39:24,943 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1267dbe60/8982208838aa41f2a39993b1a1a30e18/FLAGb1c787799 [2021-12-22 16:39:25,308 INFO L306 CDTParser]: Found 1 translation units. [2021-12-22 16:39:25,308 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i [2021-12-22 16:39:25,318 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1267dbe60/8982208838aa41f2a39993b1a1a30e18/FLAGb1c787799 [2021-12-22 16:39:25,694 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1267dbe60/8982208838aa41f2a39993b1a1a30e18 [2021-12-22 16:39:25,696 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-22 16:39:25,696 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-22 16:39:25,700 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-22 16:39:25,700 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-22 16:39:25,702 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-22 16:39:25,703 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 04:39:25" (1/1) ... [2021-12-22 16:39:25,704 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7d56c4ad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:39:25, skipping insertion in model container [2021-12-22 16:39:25,704 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 04:39:25" (1/1) ... [2021-12-22 16:39:25,708 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-22 16:39:25,735 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-22 16:39:25,933 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/heap-manipulation/sll_to_dll_rev-2.i[22636,22649] [2021-12-22 16:39:25,967 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 16:39:25,972 INFO L203 MainTranslator]: Completed pre-run [2021-12-22 16:39:26,015 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/heap-manipulation/sll_to_dll_rev-2.i[22636,22649] [2021-12-22 16:39:26,023 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 16:39:26,048 INFO L208 MainTranslator]: Completed translation [2021-12-22 16:39:26,050 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:39:26 WrapperNode [2021-12-22 16:39:26,050 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-22 16:39:26,051 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-22 16:39:26,051 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-22 16:39:26,052 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-22 16:39:26,057 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:39:26" (1/1) ... [2021-12-22 16:39:26,081 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:39:26" (1/1) ... [2021-12-22 16:39:26,107 INFO L137 Inliner]: procedures = 129, calls = 79, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 203 [2021-12-22 16:39:26,107 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-22 16:39:26,108 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-22 16:39:26,108 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-22 16:39:26,108 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-22 16:39:26,114 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:39:26" (1/1) ... [2021-12-22 16:39:26,114 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:39:26" (1/1) ... [2021-12-22 16:39:26,117 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:39:26" (1/1) ... [2021-12-22 16:39:26,117 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:39:26" (1/1) ... [2021-12-22 16:39:26,127 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:39:26" (1/1) ... [2021-12-22 16:39:26,131 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:39:26" (1/1) ... [2021-12-22 16:39:26,138 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:39:26" (1/1) ... [2021-12-22 16:39:26,145 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-22 16:39:26,145 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-22 16:39:26,145 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-22 16:39:26,145 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-22 16:39:26,146 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:39:26" (1/1) ... [2021-12-22 16:39:26,152 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 16:39:26,161 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 16:39:26,170 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) [2021-12-22 16:39:26,176 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 [2021-12-22 16:39:26,192 INFO L130 BoogieDeclarations]: Found specification of procedure fail [2021-12-22 16:39:26,192 INFO L138 BoogieDeclarations]: Found implementation of procedure fail [2021-12-22 16:39:26,192 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-22 16:39:26,193 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-22 16:39:26,193 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-22 16:39:26,193 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-12-22 16:39:26,193 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-12-22 16:39:26,193 INFO L130 BoogieDeclarations]: Found specification of procedure check_seq_prev [2021-12-22 16:39:26,193 INFO L138 BoogieDeclarations]: Found implementation of procedure check_seq_prev [2021-12-22 16:39:26,193 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-22 16:39:26,193 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-12-22 16:39:26,193 INFO L130 BoogieDeclarations]: Found specification of procedure chain_node [2021-12-22 16:39:26,193 INFO L138 BoogieDeclarations]: Found implementation of procedure chain_node [2021-12-22 16:39:26,193 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-22 16:39:26,193 INFO L130 BoogieDeclarations]: Found specification of procedure check_seq_next [2021-12-22 16:39:26,193 INFO L138 BoogieDeclarations]: Found implementation of procedure check_seq_next [2021-12-22 16:39:26,194 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-22 16:39:26,194 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-22 16:39:26,269 INFO L234 CfgBuilder]: Building ICFG [2021-12-22 16:39:26,270 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-22 16:39:26,684 INFO L275 CfgBuilder]: Performing block encoding [2021-12-22 16:39:26,698 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-22 16:39:26,698 INFO L299 CfgBuilder]: Removed 33 assume(true) statements. [2021-12-22 16:39:26,700 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 04:39:26 BoogieIcfgContainer [2021-12-22 16:39:26,700 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-22 16:39:26,701 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-22 16:39:26,701 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-22 16:39:26,703 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-22 16:39:26,704 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 04:39:25" (1/3) ... [2021-12-22 16:39:26,704 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3319e33d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 04:39:26, skipping insertion in model container [2021-12-22 16:39:26,704 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:39:26" (2/3) ... [2021-12-22 16:39:26,705 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3319e33d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 04:39:26, skipping insertion in model container [2021-12-22 16:39:26,705 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 04:39:26" (3/3) ... [2021-12-22 16:39:26,706 INFO L111 eAbstractionObserver]: Analyzing ICFG sll_to_dll_rev-2.i [2021-12-22 16:39:26,710 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-22 16:39:26,710 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 83 error locations. [2021-12-22 16:39:26,741 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-22 16:39:26,746 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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 [2021-12-22 16:39:26,749 INFO L340 AbstractCegarLoop]: Starting to check reachability of 83 error locations. [2021-12-22 16:39:26,762 INFO L276 IsEmpty]: Start isEmpty. Operand has 223 states, 121 states have (on average 2.090909090909091) internal successors, (253), 209 states have internal predecessors, (253), 17 states have call successors, (17), 4 states have call predecessors, (17), 4 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-12-22 16:39:26,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-12-22 16:39:26,766 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:26,767 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-12-22 16:39:26,767 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:26,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:26,771 INFO L85 PathProgramCache]: Analyzing trace with hash 6220774, now seen corresponding path program 1 times [2021-12-22 16:39:26,778 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:39:26,778 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [450614222] [2021-12-22 16:39:26,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:26,779 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:39:26,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:26,917 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:39:26,918 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:39:26,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [450614222] [2021-12-22 16:39:26,919 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [450614222] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:39:26,919 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:39:26,919 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 16:39:26,921 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1134315910] [2021-12-22 16:39:26,921 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:39:26,925 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-22 16:39:26,926 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:39:26,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-22 16:39:26,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-22 16:39:26,954 INFO L87 Difference]: Start difference. First operand has 223 states, 121 states have (on average 2.090909090909091) internal successors, (253), 209 states have internal predecessors, (253), 17 states have call successors, (17), 4 states have call predecessors, (17), 4 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) Second operand has 2 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:26,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:39:26,977 INFO L93 Difference]: Finished difference Result 221 states and 242 transitions. [2021-12-22 16:39:26,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-22 16:39:26,979 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-12-22 16:39:26,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:39:26,985 INFO L225 Difference]: With dead ends: 221 [2021-12-22 16:39:26,985 INFO L226 Difference]: Without dead ends: 219 [2021-12-22 16:39:26,986 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-22 16:39:26,988 INFO L933 BasicCegarLoop]: 242 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 242 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 16:39:26,988 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 242 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 16:39:27,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2021-12-22 16:39:27,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 219. [2021-12-22 16:39:27,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 116 states have (on average 1.8448275862068966) internal successors, (214), 205 states have internal predecessors, (214), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-22 16:39:27,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 240 transitions. [2021-12-22 16:39:27,026 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 240 transitions. Word has length 4 [2021-12-22 16:39:27,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:39:27,027 INFO L470 AbstractCegarLoop]: Abstraction has 219 states and 240 transitions. [2021-12-22 16:39:27,027 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:27,027 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 240 transitions. [2021-12-22 16:39:27,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-22 16:39:27,027 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:27,027 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-22 16:39:27,027 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-22 16:39:27,028 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting chain_nodeErr0REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:27,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:27,028 INFO L85 PathProgramCache]: Analyzing trace with hash 1692154958, now seen corresponding path program 1 times [2021-12-22 16:39:27,028 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:39:27,028 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2076497580] [2021-12-22 16:39:27,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:27,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:39:27,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:27,065 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:39:27,065 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:39:27,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2076497580] [2021-12-22 16:39:27,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2076497580] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:39:27,067 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:39:27,067 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 16:39:27,067 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [620859126] [2021-12-22 16:39:27,068 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:39:27,068 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 16:39:27,069 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:39:27,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 16:39:27,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 16:39:27,070 INFO L87 Difference]: Start difference. First operand 219 states and 240 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:27,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:39:27,206 INFO L93 Difference]: Finished difference Result 217 states and 238 transitions. [2021-12-22 16:39:27,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 16:39:27,207 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-12-22 16:39:27,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:39:27,208 INFO L225 Difference]: With dead ends: 217 [2021-12-22 16:39:27,208 INFO L226 Difference]: Without dead ends: 217 [2021-12-22 16:39:27,208 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 16:39:27,209 INFO L933 BasicCegarLoop]: 226 mSDtfsCounter, 17 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 367 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 16:39:27,209 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 367 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 16:39:27,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2021-12-22 16:39:27,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 217. [2021-12-22 16:39:27,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 116 states have (on average 1.8275862068965518) internal successors, (212), 203 states have internal predecessors, (212), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-22 16:39:27,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 238 transitions. [2021-12-22 16:39:27,217 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 238 transitions. Word has length 6 [2021-12-22 16:39:27,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:39:27,217 INFO L470 AbstractCegarLoop]: Abstraction has 217 states and 238 transitions. [2021-12-22 16:39:27,218 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:27,218 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 238 transitions. [2021-12-22 16:39:27,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-22 16:39:27,218 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:27,218 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-22 16:39:27,218 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-22 16:39:27,218 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting chain_nodeErr1REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:27,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:27,219 INFO L85 PathProgramCache]: Analyzing trace with hash 1692154959, now seen corresponding path program 1 times [2021-12-22 16:39:27,219 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:39:27,219 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1395200238] [2021-12-22 16:39:27,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:27,219 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:39:27,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:27,266 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:39:27,266 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:39:27,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1395200238] [2021-12-22 16:39:27,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1395200238] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:39:27,267 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:39:27,267 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 16:39:27,267 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363918887] [2021-12-22 16:39:27,267 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:39:27,267 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 16:39:27,267 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:39:27,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 16:39:27,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 16:39:27,273 INFO L87 Difference]: Start difference. First operand 217 states and 238 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:27,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:39:27,370 INFO L93 Difference]: Finished difference Result 215 states and 236 transitions. [2021-12-22 16:39:27,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 16:39:27,371 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-12-22 16:39:27,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:39:27,373 INFO L225 Difference]: With dead ends: 215 [2021-12-22 16:39:27,373 INFO L226 Difference]: Without dead ends: 215 [2021-12-22 16:39:27,373 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 16:39:27,374 INFO L933 BasicCegarLoop]: 226 mSDtfsCounter, 15 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 372 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 16:39:27,374 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 372 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 16:39:27,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2021-12-22 16:39:27,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 215. [2021-12-22 16:39:27,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 116 states have (on average 1.8103448275862069) internal successors, (210), 201 states have internal predecessors, (210), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-22 16:39:27,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 236 transitions. [2021-12-22 16:39:27,382 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 236 transitions. Word has length 6 [2021-12-22 16:39:27,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:39:27,382 INFO L470 AbstractCegarLoop]: Abstraction has 215 states and 236 transitions. [2021-12-22 16:39:27,382 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:27,382 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 236 transitions. [2021-12-22 16:39:27,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-12-22 16:39:27,382 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:27,382 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:39:27,382 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-12-22 16:39:27,382 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting chain_nodeErr4REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:27,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:27,386 INFO L85 PathProgramCache]: Analyzing trace with hash -387700622, now seen corresponding path program 1 times [2021-12-22 16:39:27,386 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:39:27,386 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [968804962] [2021-12-22 16:39:27,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:27,386 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:39:27,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:27,472 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:39:27,472 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:39:27,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [968804962] [2021-12-22 16:39:27,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [968804962] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:39:27,472 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:39:27,473 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-22 16:39:27,473 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285378982] [2021-12-22 16:39:27,473 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:39:27,473 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-22 16:39:27,473 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:39:27,473 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-22 16:39:27,473 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-12-22 16:39:27,474 INFO L87 Difference]: Start difference. First operand 215 states and 236 transitions. Second operand has 6 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:27,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:39:27,621 INFO L93 Difference]: Finished difference Result 210 states and 231 transitions. [2021-12-22 16:39:27,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-22 16:39:27,621 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-12-22 16:39:27,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:39:27,622 INFO L225 Difference]: With dead ends: 210 [2021-12-22 16:39:27,622 INFO L226 Difference]: Without dead ends: 210 [2021-12-22 16:39:27,623 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-12-22 16:39:27,624 INFO L933 BasicCegarLoop]: 208 mSDtfsCounter, 60 mSDsluCounter, 398 mSDsCounter, 0 mSdLazyCounter, 258 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 606 SdHoareTripleChecker+Invalid, 269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 258 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 16:39:27,624 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 606 Invalid, 269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 258 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 16:39:27,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2021-12-22 16:39:27,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 210. [2021-12-22 16:39:27,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 116 states have (on average 1.7672413793103448) internal successors, (205), 196 states have internal predecessors, (205), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-22 16:39:27,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 231 transitions. [2021-12-22 16:39:27,631 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 231 transitions. Word has length 10 [2021-12-22 16:39:27,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:39:27,631 INFO L470 AbstractCegarLoop]: Abstraction has 210 states and 231 transitions. [2021-12-22 16:39:27,631 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:27,631 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 231 transitions. [2021-12-22 16:39:27,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-12-22 16:39:27,631 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:27,631 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:39:27,632 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-12-22 16:39:27,632 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting chain_nodeErr5REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:27,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:27,632 INFO L85 PathProgramCache]: Analyzing trace with hash -387700621, now seen corresponding path program 1 times [2021-12-22 16:39:27,632 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:39:27,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [56565646] [2021-12-22 16:39:27,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:27,632 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:39:27,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:27,735 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:39:27,736 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:39:27,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [56565646] [2021-12-22 16:39:27,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [56565646] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:39:27,736 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:39:27,736 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-22 16:39:27,736 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961878433] [2021-12-22 16:39:27,737 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:39:27,738 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-22 16:39:27,738 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:39:27,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-22 16:39:27,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-22 16:39:27,739 INFO L87 Difference]: Start difference. First operand 210 states and 231 transitions. Second operand has 5 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:27,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:39:27,929 INFO L93 Difference]: Finished difference Result 205 states and 226 transitions. [2021-12-22 16:39:27,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-22 16:39:27,930 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-12-22 16:39:27,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:39:27,931 INFO L225 Difference]: With dead ends: 205 [2021-12-22 16:39:27,931 INFO L226 Difference]: Without dead ends: 205 [2021-12-22 16:39:27,931 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-22 16:39:27,932 INFO L933 BasicCegarLoop]: 205 mSDtfsCounter, 39 mSDsluCounter, 339 mSDsCounter, 0 mSdLazyCounter, 307 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 544 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 16:39:27,932 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 544 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 307 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-22 16:39:27,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2021-12-22 16:39:27,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2021-12-22 16:39:27,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 116 states have (on average 1.7241379310344827) internal successors, (200), 191 states have internal predecessors, (200), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-22 16:39:27,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 226 transitions. [2021-12-22 16:39:27,937 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 226 transitions. Word has length 10 [2021-12-22 16:39:27,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:39:27,938 INFO L470 AbstractCegarLoop]: Abstraction has 205 states and 226 transitions. [2021-12-22 16:39:27,938 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:27,938 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 226 transitions. [2021-12-22 16:39:27,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-22 16:39:27,938 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:27,938 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:39:27,938 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-12-22 16:39:27,938 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting chain_nodeErr6REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:27,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:27,939 INFO L85 PathProgramCache]: Analyzing trace with hash 866182740, now seen corresponding path program 1 times [2021-12-22 16:39:27,939 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:39:27,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1860884416] [2021-12-22 16:39:27,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:27,939 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:39:27,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:27,979 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:39:27,979 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:39:27,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1860884416] [2021-12-22 16:39:27,980 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1860884416] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:39:27,980 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:39:27,980 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-22 16:39:27,980 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1768500510] [2021-12-22 16:39:27,980 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:39:27,980 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-22 16:39:27,981 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:39:27,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-22 16:39:27,981 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-22 16:39:27,981 INFO L87 Difference]: Start difference. First operand 205 states and 226 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:28,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:39:28,107 INFO L93 Difference]: Finished difference Result 204 states and 225 transitions. [2021-12-22 16:39:28,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-22 16:39:28,108 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-12-22 16:39:28,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:39:28,108 INFO L225 Difference]: With dead ends: 204 [2021-12-22 16:39:28,108 INFO L226 Difference]: Without dead ends: 204 [2021-12-22 16:39:28,109 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-12-22 16:39:28,109 INFO L933 BasicCegarLoop]: 216 mSDtfsCounter, 21 mSDsluCounter, 414 mSDsCounter, 0 mSdLazyCounter, 243 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 630 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 243 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 16:39:28,111 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 630 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 243 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 16:39:28,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2021-12-22 16:39:28,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 204. [2021-12-22 16:39:28,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 116 states have (on average 1.7155172413793103) internal successors, (199), 190 states have internal predecessors, (199), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-22 16:39:28,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 225 transitions. [2021-12-22 16:39:28,120 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 225 transitions. Word has length 11 [2021-12-22 16:39:28,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:39:28,120 INFO L470 AbstractCegarLoop]: Abstraction has 204 states and 225 transitions. [2021-12-22 16:39:28,120 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:28,120 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 225 transitions. [2021-12-22 16:39:28,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-22 16:39:28,121 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:28,121 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:39:28,121 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-12-22 16:39:28,121 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting chain_nodeErr7REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:28,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:28,122 INFO L85 PathProgramCache]: Analyzing trace with hash 866182741, now seen corresponding path program 1 times [2021-12-22 16:39:28,122 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:39:28,122 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [165040625] [2021-12-22 16:39:28,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:28,122 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:39:28,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:28,172 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:39:28,173 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:39:28,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [165040625] [2021-12-22 16:39:28,173 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [165040625] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:39:28,173 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:39:28,173 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-22 16:39:28,173 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1128052065] [2021-12-22 16:39:28,173 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:39:28,174 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-22 16:39:28,174 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:39:28,174 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-22 16:39:28,174 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-12-22 16:39:28,174 INFO L87 Difference]: Start difference. First operand 204 states and 225 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:28,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:39:28,321 INFO L93 Difference]: Finished difference Result 203 states and 224 transitions. [2021-12-22 16:39:28,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-22 16:39:28,322 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-12-22 16:39:28,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:39:28,322 INFO L225 Difference]: With dead ends: 203 [2021-12-22 16:39:28,323 INFO L226 Difference]: Without dead ends: 203 [2021-12-22 16:39:28,323 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-12-22 16:39:28,323 INFO L933 BasicCegarLoop]: 216 mSDtfsCounter, 20 mSDsluCounter, 642 mSDsCounter, 0 mSdLazyCounter, 227 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 858 SdHoareTripleChecker+Invalid, 228 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 16:39:28,323 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 858 Invalid, 228 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 227 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 16:39:28,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2021-12-22 16:39:28,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 203. [2021-12-22 16:39:28,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203 states, 116 states have (on average 1.706896551724138) internal successors, (198), 189 states have internal predecessors, (198), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-22 16:39:28,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 224 transitions. [2021-12-22 16:39:28,327 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 224 transitions. Word has length 11 [2021-12-22 16:39:28,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:39:28,328 INFO L470 AbstractCegarLoop]: Abstraction has 203 states and 224 transitions. [2021-12-22 16:39:28,328 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:28,328 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 224 transitions. [2021-12-22 16:39:28,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-12-22 16:39:28,328 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:28,328 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:39:28,328 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-12-22 16:39:28,329 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:28,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:28,330 INFO L85 PathProgramCache]: Analyzing trace with hash -610249734, now seen corresponding path program 1 times [2021-12-22 16:39:28,330 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:39:28,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1926901674] [2021-12-22 16:39:28,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:28,330 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:39:28,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:28,385 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 16:39:28,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:28,432 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:39:28,433 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:39:28,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1926901674] [2021-12-22 16:39:28,433 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1926901674] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:39:28,433 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:39:28,433 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-22 16:39:28,434 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173787616] [2021-12-22 16:39:28,434 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:39:28,434 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-22 16:39:28,434 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:39:28,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-22 16:39:28,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-12-22 16:39:28,434 INFO L87 Difference]: Start difference. First operand 203 states and 224 transitions. Second operand has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 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) [2021-12-22 16:39:28,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:39:28,742 INFO L93 Difference]: Finished difference Result 202 states and 223 transitions. [2021-12-22 16:39:28,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-22 16:39:28,744 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 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 19 [2021-12-22 16:39:28,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:39:28,745 INFO L225 Difference]: With dead ends: 202 [2021-12-22 16:39:28,745 INFO L226 Difference]: Without dead ends: 202 [2021-12-22 16:39:28,745 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-12-22 16:39:28,745 INFO L933 BasicCegarLoop]: 192 mSDtfsCounter, 72 mSDsluCounter, 370 mSDsCounter, 0 mSdLazyCounter, 588 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 562 SdHoareTripleChecker+Invalid, 610 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 588 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 16:39:28,746 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 562 Invalid, 610 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 588 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-22 16:39:28,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2021-12-22 16:39:28,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 202. [2021-12-22 16:39:28,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 116 states have (on average 1.6982758620689655) internal successors, (197), 188 states have internal predecessors, (197), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-22 16:39:28,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 223 transitions. [2021-12-22 16:39:28,750 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 223 transitions. Word has length 19 [2021-12-22 16:39:28,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:39:28,750 INFO L470 AbstractCegarLoop]: Abstraction has 202 states and 223 transitions. [2021-12-22 16:39:28,751 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 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) [2021-12-22 16:39:28,751 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 223 transitions. [2021-12-22 16:39:28,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-12-22 16:39:28,751 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:28,751 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:39:28,751 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-12-22 16:39:28,751 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:28,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:28,752 INFO L85 PathProgramCache]: Analyzing trace with hash -610249733, now seen corresponding path program 1 times [2021-12-22 16:39:28,752 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:39:28,752 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [147315246] [2021-12-22 16:39:28,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:28,752 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:39:28,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:28,823 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 16:39:28,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:28,909 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:39:28,910 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:39:28,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [147315246] [2021-12-22 16:39:28,910 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [147315246] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:39:28,910 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:39:28,910 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-22 16:39:28,910 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969510099] [2021-12-22 16:39:28,910 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:39:28,910 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-22 16:39:28,910 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:39:28,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-22 16:39:28,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-12-22 16:39:28,911 INFO L87 Difference]: Start difference. First operand 202 states and 223 transitions. Second operand has 7 states, 5 states have (on average 3.4) internal successors, (17), 6 states have internal predecessors, (17), 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) [2021-12-22 16:39:29,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:39:29,203 INFO L93 Difference]: Finished difference Result 210 states and 235 transitions. [2021-12-22 16:39:29,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-22 16:39:29,203 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 3.4) internal successors, (17), 6 states have internal predecessors, (17), 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 19 [2021-12-22 16:39:29,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:39:29,205 INFO L225 Difference]: With dead ends: 210 [2021-12-22 16:39:29,206 INFO L226 Difference]: Without dead ends: 210 [2021-12-22 16:39:29,206 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-12-22 16:39:29,206 INFO L933 BasicCegarLoop]: 201 mSDtfsCounter, 56 mSDsluCounter, 320 mSDsCounter, 0 mSdLazyCounter, 472 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 521 SdHoareTripleChecker+Invalid, 494 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 472 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 16:39:29,206 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 521 Invalid, 494 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 472 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-22 16:39:29,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2021-12-22 16:39:29,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 207. [2021-12-22 16:39:29,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 120 states have (on average 1.6833333333333333) internal successors, (202), 192 states have internal predecessors, (202), 18 states have call successors, (18), 4 states have call predecessors, (18), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-22 16:39:29,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 230 transitions. [2021-12-22 16:39:29,212 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 230 transitions. Word has length 19 [2021-12-22 16:39:29,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:39:29,212 INFO L470 AbstractCegarLoop]: Abstraction has 207 states and 230 transitions. [2021-12-22 16:39:29,212 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 3.4) internal successors, (17), 6 states have internal predecessors, (17), 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) [2021-12-22 16:39:29,212 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 230 transitions. [2021-12-22 16:39:29,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-12-22 16:39:29,213 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:29,213 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-12-22 16:39:29,213 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-12-22 16:39:29,213 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:29,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:29,213 INFO L85 PathProgramCache]: Analyzing trace with hash 450998278, now seen corresponding path program 1 times [2021-12-22 16:39:29,214 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:39:29,214 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [444351507] [2021-12-22 16:39:29,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:29,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:39:29,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:29,312 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 16:39:29,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:29,372 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-12-22 16:39:29,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:29,395 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-22 16:39:29,395 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:39:29,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [444351507] [2021-12-22 16:39:29,395 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [444351507] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:39:29,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1361793141] [2021-12-22 16:39:29,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:29,396 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 16:39:29,396 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 16:39:29,397 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) [2021-12-22 16:39:29,413 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-22 16:39:29,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:29,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 36 conjunts are in the unsatisfiable core [2021-12-22 16:39:29,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:39:29,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:39:29,673 INFO L353 Elim1Store]: treesize reduction 24, result has 33.3 percent of original size [2021-12-22 16:39:29,673 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 12 treesize of output 23 [2021-12-22 16:39:29,723 INFO L353 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-12-22 16:39:29,723 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 111 treesize of output 117 [2021-12-22 16:39:29,830 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 [2021-12-22 16:39:29,835 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 [2021-12-22 16:39:29,999 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:39:30,000 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-22 16:39:30,004 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:39:30,005 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-22 16:39:30,029 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 [2021-12-22 16:39:30,185 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:39:30,185 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:39:30,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1361793141] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:39:30,268 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:39:30,268 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 10] total 12 [2021-12-22 16:39:30,268 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881295306] [2021-12-22 16:39:30,268 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:39:30,268 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-22 16:39:30,268 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:39:30,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-22 16:39:30,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2021-12-22 16:39:30,269 INFO L87 Difference]: Start difference. First operand 207 states and 230 transitions. Second operand has 13 states, 11 states have (on average 3.272727272727273) internal successors, (36), 10 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-22 16:39:30,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:39:30,496 INFO L93 Difference]: Finished difference Result 207 states and 231 transitions. [2021-12-22 16:39:30,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-22 16:39:30,497 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 3.272727272727273) internal successors, (36), 10 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 34 [2021-12-22 16:39:30,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:39:30,497 INFO L225 Difference]: With dead ends: 207 [2021-12-22 16:39:30,498 INFO L226 Difference]: Without dead ends: 207 [2021-12-22 16:39:30,498 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2021-12-22 16:39:30,498 INFO L933 BasicCegarLoop]: 198 mSDtfsCounter, 92 mSDsluCounter, 519 mSDsCounter, 0 mSdLazyCounter, 435 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 717 SdHoareTripleChecker+Invalid, 677 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 435 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 206 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 16:39:30,498 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 717 Invalid, 677 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 435 Invalid, 0 Unknown, 206 Unchecked, 0.2s Time] [2021-12-22 16:39:30,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2021-12-22 16:39:30,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 201. [2021-12-22 16:39:30,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 116 states have (on average 1.6896551724137931) internal successors, (196), 187 states have internal predecessors, (196), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-22 16:39:30,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 222 transitions. [2021-12-22 16:39:30,502 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 222 transitions. Word has length 34 [2021-12-22 16:39:30,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:39:30,502 INFO L470 AbstractCegarLoop]: Abstraction has 201 states and 222 transitions. [2021-12-22 16:39:30,503 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 3.272727272727273) internal successors, (36), 10 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-22 16:39:30,503 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 222 transitions. [2021-12-22 16:39:30,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-12-22 16:39:30,503 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:30,503 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:39:30,523 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-22 16:39:30,715 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-12-22 16:39:30,715 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:30,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:30,716 INFO L85 PathProgramCache]: Analyzing trace with hash 50383991, now seen corresponding path program 1 times [2021-12-22 16:39:30,716 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:39:30,716 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [801136309] [2021-12-22 16:39:30,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:30,716 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:39:30,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:30,801 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 16:39:30,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:30,841 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-12-22 16:39:30,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:30,878 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 16:39:30,879 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:39:30,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [801136309] [2021-12-22 16:39:30,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [801136309] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:39:30,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2086762529] [2021-12-22 16:39:30,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:30,879 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 16:39:30,879 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 16:39:30,884 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) [2021-12-22 16:39:30,885 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-22 16:39:30,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:30,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 36 conjunts are in the unsatisfiable core [2021-12-22 16:39:30,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:39:31,028 INFO L353 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-12-22 16:39:31,029 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 2 case distinctions, treesize of input 12 treesize of output 24 [2021-12-22 16:39:31,133 INFO L353 Elim1Store]: treesize reduction 20, result has 57.4 percent of original size [2021-12-22 16:39:31,134 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 25 treesize of output 46 [2021-12-22 16:39:31,472 INFO L353 Elim1Store]: treesize reduction 24, result has 48.9 percent of original size [2021-12-22 16:39:31,472 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 21 treesize of output 38 [2021-12-22 16:39:31,544 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-22 16:39:31,544 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:39:31,946 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2086762529] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:39:31,946 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:39:31,946 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 17 [2021-12-22 16:39:31,946 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357230140] [2021-12-22 16:39:31,946 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:39:31,947 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-12-22 16:39:31,947 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:39:31,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-12-22 16:39:31,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=523, Unknown=0, NotChecked=0, Total=650 [2021-12-22 16:39:31,947 INFO L87 Difference]: Start difference. First operand 201 states and 222 transitions. Second operand has 18 states, 15 states have (on average 4.066666666666666) internal successors, (61), 16 states have internal predecessors, (61), 4 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-22 16:39:32,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:39:32,388 INFO L93 Difference]: Finished difference Result 203 states and 226 transitions. [2021-12-22 16:39:32,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-22 16:39:32,389 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 15 states have (on average 4.066666666666666) internal successors, (61), 16 states have internal predecessors, (61), 4 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) Word has length 37 [2021-12-22 16:39:32,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:39:32,390 INFO L225 Difference]: With dead ends: 203 [2021-12-22 16:39:32,390 INFO L226 Difference]: Without dead ends: 203 [2021-12-22 16:39:32,390 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 37 SyntacticMatches, 10 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 294 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=186, Invalid=744, Unknown=0, NotChecked=0, Total=930 [2021-12-22 16:39:32,391 INFO L933 BasicCegarLoop]: 193 mSDtfsCounter, 226 mSDsluCounter, 737 mSDsCounter, 0 mSdLazyCounter, 568 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 930 SdHoareTripleChecker+Invalid, 1044 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 568 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 417 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 16:39:32,391 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [226 Valid, 930 Invalid, 1044 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 568 Invalid, 0 Unknown, 417 Unchecked, 0.3s Time] [2021-12-22 16:39:32,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2021-12-22 16:39:32,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 200. [2021-12-22 16:39:32,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 116 states have (on average 1.6810344827586208) internal successors, (195), 186 states have internal predecessors, (195), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-22 16:39:32,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 221 transitions. [2021-12-22 16:39:32,395 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 221 transitions. Word has length 37 [2021-12-22 16:39:32,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:39:32,395 INFO L470 AbstractCegarLoop]: Abstraction has 200 states and 221 transitions. [2021-12-22 16:39:32,395 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 15 states have (on average 4.066666666666666) internal successors, (61), 16 states have internal predecessors, (61), 4 states have call successors, (4), 2 states have call predecessors, (4), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-22 16:39:32,395 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 221 transitions. [2021-12-22 16:39:32,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-12-22 16:39:32,395 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:32,396 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:39:32,412 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-22 16:39:32,599 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,SelfDestructingSolverStorable10 [2021-12-22 16:39:32,600 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:32,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:32,600 INFO L85 PathProgramCache]: Analyzing trace with hash 50383992, now seen corresponding path program 1 times [2021-12-22 16:39:32,600 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 16:39:32,600 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1771034969] [2021-12-22 16:39:32,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:32,600 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 16:39:32,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:32,714 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 16:39:32,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:32,759 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-12-22 16:39:32,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:32,801 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 16:39:32,801 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 16:39:32,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1771034969] [2021-12-22 16:39:32,801 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1771034969] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:39:32,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [303546863] [2021-12-22 16:39:32,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:32,801 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 16:39:32,801 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 16:39:32,802 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) [2021-12-22 16:39:32,803 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-22 16:39:32,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:32,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 30 conjunts are in the unsatisfiable core [2021-12-22 16:39:32,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:39:32,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:39:32,961 INFO L353 Elim1Store]: treesize reduction 20, result has 48.7 percent of original size [2021-12-22 16:39:32,961 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 12 treesize of output 24 [2021-12-22 16:39:32,965 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 10 treesize of output 8 [2021-12-22 16:39:32,997 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 9 treesize of output 7 [2021-12-22 16:39:33,166 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 9 treesize of output 7 [2021-12-22 16:39:33,304 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: line 110413 column 46: unknown constant v_#length_BEFORE_CALL_8 [2021-12-22 16:39:33,304 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-22 16:39:33,304 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-12-22 16:39:33,304 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [575371913] [2021-12-22 16:39:33,304 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-22 16:39:33,305 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-22 16:39:33,305 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 16:39:33,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-22 16:39:33,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-12-22 16:39:33,305 INFO L87 Difference]: Start difference. First operand 200 states and 221 transitions. Second operand has 10 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 9 states have internal predecessors, (33), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-22 16:39:33,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-22 16:39:33,306 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-12-22 16:39:33,306 INFO L933 BasicCegarLoop]: 1 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 1 SdHoareTripleChecker+Invalid, 1 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 16:39:33,307 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 1 Invalid, 1 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 16:39:33,326 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-22 16:39:33,523 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 16:39:33,524 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.MonolithicImplicationChecker@6dae8b22 at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.lock(ManagedScript.java:82) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.assertCodeBlock(IncrementalHoareTripleChecker.java:360) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.prepareAssertionStackAndAddTransition(IncrementalHoareTripleChecker.java:206) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.checkInternal(IncrementalHoareTripleChecker.java:131) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.ChainingHoareTripleChecker$ProtectedHtc.checkInternal(ChainingHoareTripleChecker.java:455) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.ChainingHoareTripleChecker.checkInternal(ChainingHoareTripleChecker.java:103) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.CachingHoareTripleChecker.checkInternal(CachingHoareTripleChecker.java:95) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton$InternalSuccessorComputationHelper.computeSuccWithSolver(AbstractInterpolantAutomaton.java:357) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.DeterministicInterpolantAutomaton.addOtherSuccessors(DeterministicInterpolantAutomaton.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.computeSuccs(BasicAbstractInterpolantAutomaton.java:78) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.computeSuccs(BasicAbstractInterpolantAutomaton.java:1) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.internalSuccessors(AbstractInterpolantAutomaton.java:233) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.internalSuccessors(AbstractInterpolantAutomaton.java:1) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.TotalizeNwa.internalSuccessors(TotalizeNwa.java:213) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ComplementDeterministicNwa.internalSuccessors(ComplementDeterministicNwa.java:121) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ProductNwa.internalSuccessors(ProductNwa.java:216) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ProductNwa.internalSuccessors(ProductNwa.java:208) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates$ReachableStatesComputation.addInternalsAndSuccessors(NestedWordAutomatonReachableStates.java:1058) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates$ReachableStatesComputation.(NestedWordAutomatonReachableStates.java:960) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates.(NestedWordAutomatonReachableStates.java:182) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.Difference.computeDifference(Difference.java:137) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.Difference.(Difference.java:90) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.computeAutomataDifference(BasicCegarLoop.java:868) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.refineAbstraction(BasicCegarLoop.java:784) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.refineAbstractionInternal(AbstractCegarLoop.java:462) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:420) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-12-22 16:39:33,527 INFO L158 Benchmark]: Toolchain (without parser) took 7830.15ms. Allocated memory was 96.5MB in the beginning and 172.0MB in the end (delta: 75.5MB). Free memory was 59.4MB in the beginning and 87.8MB in the end (delta: -28.4MB). Peak memory consumption was 45.9MB. Max. memory is 16.1GB. [2021-12-22 16:39:33,527 INFO L158 Benchmark]: CDTParser took 0.16ms. Allocated memory is still 96.5MB. Free memory was 69.7MB in the beginning and 69.7MB in the end (delta: 29.6kB). There was no memory consumed. Max. memory is 16.1GB. [2021-12-22 16:39:33,527 INFO L158 Benchmark]: CACSL2BoogieTranslator took 350.58ms. Allocated memory is still 96.5MB. Free memory was 59.1MB in the beginning and 64.2MB in the end (delta: -5.2MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-12-22 16:39:33,527 INFO L158 Benchmark]: Boogie Procedure Inliner took 56.17ms. Allocated memory is still 96.5MB. Free memory was 64.2MB in the beginning and 61.7MB in the end (delta: 2.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-12-22 16:39:33,527 INFO L158 Benchmark]: Boogie Preprocessor took 36.67ms. Allocated memory is still 96.5MB. Free memory was 61.7MB in the beginning and 59.1MB in the end (delta: 2.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-12-22 16:39:33,527 INFO L158 Benchmark]: RCFGBuilder took 554.98ms. Allocated memory was 96.5MB in the beginning and 117.4MB in the end (delta: 21.0MB). Free memory was 59.1MB in the beginning and 90.3MB in the end (delta: -31.2MB). Peak memory consumption was 38.6MB. Max. memory is 16.1GB. [2021-12-22 16:39:33,528 INFO L158 Benchmark]: TraceAbstraction took 6825.20ms. Allocated memory was 117.4MB in the beginning and 172.0MB in the end (delta: 54.5MB). Free memory was 89.7MB in the beginning and 87.8MB in the end (delta: 1.9MB). Peak memory consumption was 56.3MB. Max. memory is 16.1GB. [2021-12-22 16:39:33,529 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16ms. Allocated memory is still 96.5MB. Free memory was 69.7MB in the beginning and 69.7MB in the end (delta: 29.6kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 350.58ms. Allocated memory is still 96.5MB. Free memory was 59.1MB in the beginning and 64.2MB in the end (delta: -5.2MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 56.17ms. Allocated memory is still 96.5MB. Free memory was 64.2MB in the beginning and 61.7MB in the end (delta: 2.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 36.67ms. Allocated memory is still 96.5MB. Free memory was 61.7MB in the beginning and 59.1MB in the end (delta: 2.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 554.98ms. Allocated memory was 96.5MB in the beginning and 117.4MB in the end (delta: 21.0MB). Free memory was 59.1MB in the beginning and 90.3MB in the end (delta: -31.2MB). Peak memory consumption was 38.6MB. Max. memory is 16.1GB. * TraceAbstraction took 6825.20ms. Allocated memory was 117.4MB in the beginning and 172.0MB in the end (delta: 54.5MB). Free memory was 89.7MB in the beginning and 87.8MB in the end (delta: 1.9MB). Peak memory consumption was 56.3MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.MonolithicImplicationChecker@6dae8b22 de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.MonolithicImplicationChecker@6dae8b22: de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.lock(ManagedScript.java:82) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-12-22 16:39:33,539 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Ended with exit code 1 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### 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/AutomizerMemDerefMemtrack.xml -i ../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.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 valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 8f9453cad2383b5119b308e041fed5f4a740e7abd43cb8ad7833872af20a8d57 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-e19ca92 [2021-12-22 16:39:35,113 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-22 16:39:35,115 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-22 16:39:35,146 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-22 16:39:35,147 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-22 16:39:35,149 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-22 16:39:35,150 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-22 16:39:35,154 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-22 16:39:35,155 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-22 16:39:35,158 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-22 16:39:35,159 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-22 16:39:35,162 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-22 16:39:35,162 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-22 16:39:35,163 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-22 16:39:35,164 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-22 16:39:35,165 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-22 16:39:35,166 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-22 16:39:35,166 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-22 16:39:35,167 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-22 16:39:35,171 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-22 16:39:35,172 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-22 16:39:35,173 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-22 16:39:35,174 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-22 16:39:35,175 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-22 16:39:35,177 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-22 16:39:35,178 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-22 16:39:35,178 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-22 16:39:35,190 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-22 16:39:35,190 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-22 16:39:35,191 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-22 16:39:35,191 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-22 16:39:35,192 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-22 16:39:35,193 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-22 16:39:35,193 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-22 16:39:35,194 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-22 16:39:35,194 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-22 16:39:35,195 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-22 16:39:35,195 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-22 16:39:35,195 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-22 16:39:35,196 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-22 16:39:35,197 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-22 16:39:35,199 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf [2021-12-22 16:39:35,222 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-22 16:39:35,223 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-22 16:39:35,224 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-22 16:39:35,224 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-22 16:39:35,224 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-22 16:39:35,225 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-22 16:39:35,225 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-22 16:39:35,226 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-22 16:39:35,226 INFO L138 SettingsManager]: * Use SBE=true [2021-12-22 16:39:35,226 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-22 16:39:35,227 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-22 16:39:35,227 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-22 16:39:35,227 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-22 16:39:35,227 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-22 16:39:35,227 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-22 16:39:35,227 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-22 16:39:35,228 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-22 16:39:35,228 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-12-22 16:39:35,228 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-22 16:39:35,228 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-22 16:39:35,228 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-12-22 16:39:35,228 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-12-22 16:39:35,228 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-22 16:39:35,228 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-22 16:39:35,229 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-22 16:39:35,229 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-22 16:39:35,229 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-22 16:39:35,229 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 16:39:35,229 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-22 16:39:35,229 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-22 16:39:35,229 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2021-12-22 16:39:35,230 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-12-22 16:39:35,230 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-22 16:39:35,230 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-12-22 16:39:35,230 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8f9453cad2383b5119b308e041fed5f4a740e7abd43cb8ad7833872af20a8d57 [2021-12-22 16:39:35,451 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-22 16:39:35,471 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-22 16:39:35,474 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-22 16:39:35,475 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-22 16:39:35,475 INFO L275 PluginConnector]: CDTParser initialized [2021-12-22 16:39:35,476 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i [2021-12-22 16:39:35,526 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/98452554a/8cda66fd7925431ca308aed2134fac00/FLAGef7c9383d [2021-12-22 16:39:35,935 INFO L306 CDTParser]: Found 1 translation units. [2021-12-22 16:39:35,936 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i [2021-12-22 16:39:35,948 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/98452554a/8cda66fd7925431ca308aed2134fac00/FLAGef7c9383d [2021-12-22 16:39:35,968 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/98452554a/8cda66fd7925431ca308aed2134fac00 [2021-12-22 16:39:35,970 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-22 16:39:35,972 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-22 16:39:35,974 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-22 16:39:35,974 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-22 16:39:35,977 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-22 16:39:35,977 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 04:39:35" (1/1) ... [2021-12-22 16:39:35,978 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2736417a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:39:35, skipping insertion in model container [2021-12-22 16:39:35,978 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 04:39:35" (1/1) ... [2021-12-22 16:39:35,983 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-22 16:39:36,028 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-22 16:39:36,296 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/heap-manipulation/sll_to_dll_rev-2.i[22636,22649] [2021-12-22 16:39:36,326 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 16:39:36,345 INFO L203 MainTranslator]: Completed pre-run [2021-12-22 16:39:36,375 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/heap-manipulation/sll_to_dll_rev-2.i[22636,22649] [2021-12-22 16:39:36,394 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 16:39:36,427 INFO L208 MainTranslator]: Completed translation [2021-12-22 16:39:36,427 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:39:36 WrapperNode [2021-12-22 16:39:36,427 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-22 16:39:36,428 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-22 16:39:36,428 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-22 16:39:36,428 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-22 16:39:36,432 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:39:36" (1/1) ... [2021-12-22 16:39:36,452 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:39:36" (1/1) ... [2021-12-22 16:39:36,473 INFO L137 Inliner]: procedures = 130, calls = 79, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 201 [2021-12-22 16:39:36,473 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-22 16:39:36,474 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-22 16:39:36,474 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-22 16:39:36,474 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-22 16:39:36,479 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:39:36" (1/1) ... [2021-12-22 16:39:36,479 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:39:36" (1/1) ... [2021-12-22 16:39:36,485 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:39:36" (1/1) ... [2021-12-22 16:39:36,485 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:39:36" (1/1) ... [2021-12-22 16:39:36,491 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:39:36" (1/1) ... [2021-12-22 16:39:36,500 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:39:36" (1/1) ... [2021-12-22 16:39:36,505 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:39:36" (1/1) ... [2021-12-22 16:39:36,508 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-22 16:39:36,509 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-22 16:39:36,509 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-22 16:39:36,509 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-22 16:39:36,510 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:39:36" (1/1) ... [2021-12-22 16:39:36,515 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 16:39:36,525 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 16:39:36,536 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) [2021-12-22 16:39:36,546 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 [2021-12-22 16:39:36,567 INFO L130 BoogieDeclarations]: Found specification of procedure fail [2021-12-22 16:39:36,567 INFO L138 BoogieDeclarations]: Found implementation of procedure fail [2021-12-22 16:39:36,567 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-22 16:39:36,567 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-22 16:39:36,567 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-22 16:39:36,567 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-12-22 16:39:36,568 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-12-22 16:39:36,568 INFO L130 BoogieDeclarations]: Found specification of procedure check_seq_prev [2021-12-22 16:39:36,568 INFO L138 BoogieDeclarations]: Found implementation of procedure check_seq_prev [2021-12-22 16:39:36,568 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-22 16:39:36,568 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-12-22 16:39:36,568 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-12-22 16:39:36,568 INFO L130 BoogieDeclarations]: Found specification of procedure chain_node [2021-12-22 16:39:36,568 INFO L138 BoogieDeclarations]: Found implementation of procedure chain_node [2021-12-22 16:39:36,568 INFO L130 BoogieDeclarations]: Found specification of procedure check_seq_next [2021-12-22 16:39:36,569 INFO L138 BoogieDeclarations]: Found implementation of procedure check_seq_next [2021-12-22 16:39:36,569 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-22 16:39:36,569 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-22 16:39:36,659 INFO L234 CfgBuilder]: Building ICFG [2021-12-22 16:39:36,676 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-22 16:39:37,333 INFO L275 CfgBuilder]: Performing block encoding [2021-12-22 16:39:37,340 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-22 16:39:37,340 INFO L299 CfgBuilder]: Removed 33 assume(true) statements. [2021-12-22 16:39:37,341 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 04:39:37 BoogieIcfgContainer [2021-12-22 16:39:37,341 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-22 16:39:37,343 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-22 16:39:37,343 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-22 16:39:37,345 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-22 16:39:37,345 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 04:39:35" (1/3) ... [2021-12-22 16:39:37,345 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d6a3948 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 04:39:37, skipping insertion in model container [2021-12-22 16:39:37,345 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:39:36" (2/3) ... [2021-12-22 16:39:37,346 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d6a3948 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 04:39:37, skipping insertion in model container [2021-12-22 16:39:37,346 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 04:39:37" (3/3) ... [2021-12-22 16:39:37,347 INFO L111 eAbstractionObserver]: Analyzing ICFG sll_to_dll_rev-2.i [2021-12-22 16:39:37,350 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-22 16:39:37,353 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 83 error locations. [2021-12-22 16:39:37,379 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-22 16:39:37,383 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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 [2021-12-22 16:39:37,383 INFO L340 AbstractCegarLoop]: Starting to check reachability of 83 error locations. [2021-12-22 16:39:37,397 INFO L276 IsEmpty]: Start isEmpty. Operand has 220 states, 118 states have (on average 2.1186440677966103) internal successors, (250), 206 states have internal predecessors, (250), 17 states have call successors, (17), 4 states have call predecessors, (17), 4 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-12-22 16:39:37,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-12-22 16:39:37,401 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:37,402 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-12-22 16:39:37,402 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:37,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:37,409 INFO L85 PathProgramCache]: Analyzing trace with hash 6220742, now seen corresponding path program 1 times [2021-12-22 16:39:37,416 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:39:37,417 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [607262652] [2021-12-22 16:39:37,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:37,417 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:39:37,418 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:39:37,419 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:39:37,423 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-12-22 16:39:37,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:37,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 1 conjunts are in the unsatisfiable core [2021-12-22 16:39:37,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:39:37,504 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:39:37,504 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:39:37,505 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:39:37,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [607262652] [2021-12-22 16:39:37,505 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [607262652] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:39:37,506 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:39:37,506 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 16:39:37,507 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690230446] [2021-12-22 16:39:37,507 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:39:37,510 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-22 16:39:37,510 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:39:37,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-22 16:39:37,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-22 16:39:37,529 INFO L87 Difference]: Start difference. First operand has 220 states, 118 states have (on average 2.1186440677966103) internal successors, (250), 206 states have internal predecessors, (250), 17 states have call successors, (17), 4 states have call predecessors, (17), 4 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) Second operand has 2 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:37,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:39:37,562 INFO L93 Difference]: Finished difference Result 218 states and 239 transitions. [2021-12-22 16:39:37,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-22 16:39:37,564 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-12-22 16:39:37,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:39:37,571 INFO L225 Difference]: With dead ends: 218 [2021-12-22 16:39:37,572 INFO L226 Difference]: Without dead ends: 216 [2021-12-22 16:39:37,573 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-22 16:39:37,578 INFO L933 BasicCegarLoop]: 239 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 16:39:37,579 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 239 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 16:39:37,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2021-12-22 16:39:37,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 216. [2021-12-22 16:39:37,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 113 states have (on average 1.8672566371681416) internal successors, (211), 202 states have internal predecessors, (211), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-22 16:39:37,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 237 transitions. [2021-12-22 16:39:37,619 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 237 transitions. Word has length 4 [2021-12-22 16:39:37,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:39:37,619 INFO L470 AbstractCegarLoop]: Abstraction has 216 states and 237 transitions. [2021-12-22 16:39:37,619 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:37,620 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 237 transitions. [2021-12-22 16:39:37,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-22 16:39:37,620 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:37,620 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-22 16:39:37,629 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Ended with exit code 0 [2021-12-22 16:39:37,826 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:39:37,827 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting chain_nodeErr0REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:37,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:37,829 INFO L85 PathProgramCache]: Analyzing trace with hash 1692065585, now seen corresponding path program 1 times [2021-12-22 16:39:37,834 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:39:37,834 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [973004042] [2021-12-22 16:39:37,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:37,834 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:39:37,835 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:39:37,835 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:39:37,837 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-12-22 16:39:37,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:37,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-22 16:39:37,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:39:37,925 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 [2021-12-22 16:39:37,933 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:39:37,933 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:39:37,934 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:39:37,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [973004042] [2021-12-22 16:39:37,934 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [973004042] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:39:37,934 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:39:37,934 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 16:39:37,934 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [18207190] [2021-12-22 16:39:37,935 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:39:37,935 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 16:39:37,936 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:39:37,936 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 16:39:37,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 16:39:37,936 INFO L87 Difference]: Start difference. First operand 216 states and 237 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:38,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:39:38,202 INFO L93 Difference]: Finished difference Result 214 states and 235 transitions. [2021-12-22 16:39:38,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 16:39:38,203 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-12-22 16:39:38,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:39:38,204 INFO L225 Difference]: With dead ends: 214 [2021-12-22 16:39:38,204 INFO L226 Difference]: Without dead ends: 214 [2021-12-22 16:39:38,204 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 [2021-12-22 16:39:38,205 INFO L933 BasicCegarLoop]: 223 mSDtfsCounter, 17 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 361 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 16:39:38,205 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 361 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-22 16:39:38,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2021-12-22 16:39:38,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 214. [2021-12-22 16:39:38,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 113 states have (on average 1.8495575221238938) internal successors, (209), 200 states have internal predecessors, (209), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-22 16:39:38,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 235 transitions. [2021-12-22 16:39:38,214 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 235 transitions. Word has length 6 [2021-12-22 16:39:38,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:39:38,215 INFO L470 AbstractCegarLoop]: Abstraction has 214 states and 235 transitions. [2021-12-22 16:39:38,215 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:38,215 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 235 transitions. [2021-12-22 16:39:38,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-22 16:39:38,215 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:38,215 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-22 16:39:38,224 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-12-22 16:39:38,422 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:39:38,422 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting chain_nodeErr1REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:38,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:38,423 INFO L85 PathProgramCache]: Analyzing trace with hash 1692065586, now seen corresponding path program 1 times [2021-12-22 16:39:38,423 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:39:38,423 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [915314390] [2021-12-22 16:39:38,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:38,424 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:39:38,424 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:39:38,424 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:39:38,426 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-12-22 16:39:38,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:38,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-22 16:39:38,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:39:38,497 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 [2021-12-22 16:39:38,508 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:39:38,509 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:39:38,509 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:39:38,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [915314390] [2021-12-22 16:39:38,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [915314390] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:39:38,509 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:39:38,509 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 16:39:38,509 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [993575433] [2021-12-22 16:39:38,509 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:39:38,510 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 16:39:38,510 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:39:38,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 16:39:38,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 16:39:38,510 INFO L87 Difference]: Start difference. First operand 214 states and 235 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:38,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:39:38,720 INFO L93 Difference]: Finished difference Result 212 states and 233 transitions. [2021-12-22 16:39:38,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 16:39:38,721 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-12-22 16:39:38,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:39:38,721 INFO L225 Difference]: With dead ends: 212 [2021-12-22 16:39:38,722 INFO L226 Difference]: Without dead ends: 212 [2021-12-22 16:39:38,722 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 [2021-12-22 16:39:38,722 INFO L933 BasicCegarLoop]: 223 mSDtfsCounter, 15 mSDsluCounter, 143 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 366 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 16:39:38,723 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 366 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-22 16:39:38,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-12-22 16:39:38,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 212. [2021-12-22 16:39:38,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 113 states have (on average 1.831858407079646) internal successors, (207), 198 states have internal predecessors, (207), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-22 16:39:38,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 233 transitions. [2021-12-22 16:39:38,731 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 233 transitions. Word has length 6 [2021-12-22 16:39:38,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:39:38,731 INFO L470 AbstractCegarLoop]: Abstraction has 212 states and 233 transitions. [2021-12-22 16:39:38,731 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:38,731 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 233 transitions. [2021-12-22 16:39:38,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-12-22 16:39:38,731 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:38,731 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:39:38,741 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-12-22 16:39:38,941 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:39:38,942 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting chain_nodeErr4REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:38,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:38,943 INFO L85 PathProgramCache]: Analyzing trace with hash -1321164331, now seen corresponding path program 1 times [2021-12-22 16:39:38,943 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:39:38,944 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1308735125] [2021-12-22 16:39:38,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:38,944 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:39:38,944 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:39:38,949 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:39:38,951 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-12-22 16:39:39,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:39,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 9 conjunts are in the unsatisfiable core [2021-12-22 16:39:39,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:39:39,062 INFO L353 Elim1Store]: treesize reduction 27, result has 50.9 percent of original size [2021-12-22 16:39:39,062 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 2 case distinctions, treesize of input 12 treesize of output 33 [2021-12-22 16:39:39,128 INFO L353 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-22 16:39:39,129 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 27 [2021-12-22 16:39:39,226 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:39:39,226 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:39:39,226 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:39:39,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1308735125] [2021-12-22 16:39:39,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1308735125] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:39:39,227 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:39:39,227 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-22 16:39:39,227 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [661405676] [2021-12-22 16:39:39,227 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:39:39,227 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-22 16:39:39,227 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:39:39,227 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-22 16:39:39,228 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-22 16:39:39,228 INFO L87 Difference]: Start difference. First operand 212 states and 233 transitions. Second operand has 5 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:39,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:39:39,451 INFO L93 Difference]: Finished difference Result 222 states and 247 transitions. [2021-12-22 16:39:39,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-22 16:39:39,452 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-12-22 16:39:39,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:39:39,453 INFO L225 Difference]: With dead ends: 222 [2021-12-22 16:39:39,454 INFO L226 Difference]: Without dead ends: 222 [2021-12-22 16:39:39,454 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-22 16:39:39,454 INFO L933 BasicCegarLoop]: 226 mSDtfsCounter, 9 mSDsluCounter, 433 mSDsCounter, 0 mSdLazyCounter, 172 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 659 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 172 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 89 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 16:39:39,455 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 659 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 172 Invalid, 0 Unknown, 89 Unchecked, 0.2s Time] [2021-12-22 16:39:39,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2021-12-22 16:39:39,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 222. [2021-12-22 16:39:39,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 222 states, 120 states have (on average 1.7916666666666667) internal successors, (215), 207 states have internal predecessors, (215), 20 states have call successors, (20), 5 states have call predecessors, (20), 3 states have return successors, (12), 9 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-22 16:39:39,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 247 transitions. [2021-12-22 16:39:39,462 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 247 transitions. Word has length 10 [2021-12-22 16:39:39,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:39:39,463 INFO L470 AbstractCegarLoop]: Abstraction has 222 states and 247 transitions. [2021-12-22 16:39:39,463 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:39,463 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 247 transitions. [2021-12-22 16:39:39,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-12-22 16:39:39,463 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:39,464 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:39:39,475 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-12-22 16:39:39,673 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:39:39,674 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting chain_nodeErr5REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:39,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:39,674 INFO L85 PathProgramCache]: Analyzing trace with hash -1321164330, now seen corresponding path program 1 times [2021-12-22 16:39:39,675 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:39:39,675 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [911690200] [2021-12-22 16:39:39,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:39,675 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:39:39,675 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:39:39,676 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:39:39,678 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-12-22 16:39:39,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:39,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-22 16:39:39,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:39:39,791 INFO L353 Elim1Store]: treesize reduction 33, result has 40.0 percent of original size [2021-12-22 16:39:39,791 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 2 case distinctions, treesize of input 12 treesize of output 27 [2021-12-22 16:39:39,826 INFO L353 Elim1Store]: treesize reduction 27, result has 50.9 percent of original size [2021-12-22 16:39:39,827 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 2 case distinctions, treesize of input 12 treesize of output 33 [2021-12-22 16:39:39,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:39:39,912 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-22 16:39:39,920 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-22 16:39:39,921 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-12-22 16:39:39,966 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:39:39,967 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:39:39,967 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:39:39,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [911690200] [2021-12-22 16:39:39,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [911690200] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:39:39,967 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:39:39,967 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-22 16:39:39,967 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1087535139] [2021-12-22 16:39:39,967 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:39:39,968 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-22 16:39:39,968 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:39:39,968 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-22 16:39:39,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-22 16:39:39,969 INFO L87 Difference]: Start difference. First operand 222 states and 247 transitions. Second operand has 5 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:40,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:39:40,452 INFO L93 Difference]: Finished difference Result 214 states and 238 transitions. [2021-12-22 16:39:40,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-22 16:39:40,453 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-12-22 16:39:40,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:39:40,454 INFO L225 Difference]: With dead ends: 214 [2021-12-22 16:39:40,454 INFO L226 Difference]: Without dead ends: 214 [2021-12-22 16:39:40,454 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-22 16:39:40,454 INFO L933 BasicCegarLoop]: 202 mSDtfsCounter, 40 mSDsluCounter, 333 mSDsCounter, 0 mSdLazyCounter, 311 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 535 SdHoareTripleChecker+Invalid, 324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 311 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-22 16:39:40,455 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 535 Invalid, 324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 311 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-22 16:39:40,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2021-12-22 16:39:40,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 214. [2021-12-22 16:39:40,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 120 states have (on average 1.7166666666666666) internal successors, (206), 199 states have internal predecessors, (206), 20 states have call successors, (20), 5 states have call predecessors, (20), 3 states have return successors, (12), 9 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-22 16:39:40,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 238 transitions. [2021-12-22 16:39:40,460 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 238 transitions. Word has length 10 [2021-12-22 16:39:40,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:39:40,461 INFO L470 AbstractCegarLoop]: Abstraction has 214 states and 238 transitions. [2021-12-22 16:39:40,461 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:40,461 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 238 transitions. [2021-12-22 16:39:40,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-22 16:39:40,461 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:40,461 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:39:40,470 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-12-22 16:39:40,668 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:39:40,668 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting chain_nodeErr6REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:40,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:40,669 INFO L85 PathProgramCache]: Analyzing trace with hash 1993578833, now seen corresponding path program 1 times [2021-12-22 16:39:40,669 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:39:40,669 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [191000515] [2021-12-22 16:39:40,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:40,669 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:39:40,669 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:39:40,670 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:39:40,671 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-12-22 16:39:40,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:40,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-22 16:39:40,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:39:40,753 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 [2021-12-22 16:39:40,776 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:39:40,776 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:39:40,776 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:39:40,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [191000515] [2021-12-22 16:39:40,776 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [191000515] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:39:40,776 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:39:40,777 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-22 16:39:40,777 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089149797] [2021-12-22 16:39:40,777 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:39:40,777 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-22 16:39:40,777 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:39:40,777 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-22 16:39:40,777 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-22 16:39:40,777 INFO L87 Difference]: Start difference. First operand 214 states and 238 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:41,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:39:41,067 INFO L93 Difference]: Finished difference Result 213 states and 237 transitions. [2021-12-22 16:39:41,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-22 16:39:41,067 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-12-22 16:39:41,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:39:41,068 INFO L225 Difference]: With dead ends: 213 [2021-12-22 16:39:41,069 INFO L226 Difference]: Without dead ends: 213 [2021-12-22 16:39:41,069 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-12-22 16:39:41,069 INFO L933 BasicCegarLoop]: 213 mSDtfsCounter, 26 mSDsluCounter, 405 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 618 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 16:39:41,070 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 618 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 245 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-22 16:39:41,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2021-12-22 16:39:41,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 213. [2021-12-22 16:39:41,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 213 states, 120 states have (on average 1.7083333333333333) internal successors, (205), 198 states have internal predecessors, (205), 20 states have call successors, (20), 5 states have call predecessors, (20), 3 states have return successors, (12), 9 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-22 16:39:41,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 237 transitions. [2021-12-22 16:39:41,075 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 237 transitions. Word has length 11 [2021-12-22 16:39:41,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:39:41,075 INFO L470 AbstractCegarLoop]: Abstraction has 213 states and 237 transitions. [2021-12-22 16:39:41,076 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:41,076 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 237 transitions. [2021-12-22 16:39:41,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-22 16:39:41,076 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:41,076 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:39:41,085 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Ended with exit code 0 [2021-12-22 16:39:41,282 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:39:41,283 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting chain_nodeErr7REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:41,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:41,284 INFO L85 PathProgramCache]: Analyzing trace with hash 1993578834, now seen corresponding path program 1 times [2021-12-22 16:39:41,284 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:39:41,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [109250707] [2021-12-22 16:39:41,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:41,284 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:39:41,284 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:39:41,287 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:39:41,289 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-12-22 16:39:41,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:41,352 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-22 16:39:41,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:39:41,367 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 [2021-12-22 16:39:41,415 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:39:41,416 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:39:41,416 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:39:41,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [109250707] [2021-12-22 16:39:41,416 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [109250707] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:39:41,416 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:39:41,416 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-22 16:39:41,416 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672624392] [2021-12-22 16:39:41,416 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:39:41,416 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-22 16:39:41,417 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:39:41,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-22 16:39:41,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-22 16:39:41,417 INFO L87 Difference]: Start difference. First operand 213 states and 237 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:41,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:39:41,778 INFO L93 Difference]: Finished difference Result 212 states and 236 transitions. [2021-12-22 16:39:41,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-22 16:39:41,778 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-12-22 16:39:41,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:39:41,779 INFO L225 Difference]: With dead ends: 212 [2021-12-22 16:39:41,779 INFO L226 Difference]: Without dead ends: 212 [2021-12-22 16:39:41,779 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-12-22 16:39:41,780 INFO L933 BasicCegarLoop]: 215 mSDtfsCounter, 23 mSDsluCounter, 420 mSDsCounter, 0 mSdLazyCounter, 227 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 635 SdHoareTripleChecker+Invalid, 227 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 16:39:41,780 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 635 Invalid, 227 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 227 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-22 16:39:41,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-12-22 16:39:41,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 212. [2021-12-22 16:39:41,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 120 states have (on average 1.7) internal successors, (204), 197 states have internal predecessors, (204), 20 states have call successors, (20), 5 states have call predecessors, (20), 3 states have return successors, (12), 9 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-22 16:39:41,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 236 transitions. [2021-12-22 16:39:41,788 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 236 transitions. Word has length 11 [2021-12-22 16:39:41,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:39:41,789 INFO L470 AbstractCegarLoop]: Abstraction has 212 states and 236 transitions. [2021-12-22 16:39:41,789 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:41,789 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 236 transitions. [2021-12-22 16:39:41,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-12-22 16:39:41,789 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:41,789 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:39:41,799 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-12-22 16:39:41,995 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:39:41,995 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting chain_nodeErr8REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:41,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:41,996 INFO L85 PathProgramCache]: Analyzing trace with hash 273848882, now seen corresponding path program 1 times [2021-12-22 16:39:41,996 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:39:41,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [890173921] [2021-12-22 16:39:41,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:41,996 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:39:41,996 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:39:41,998 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:39:41,999 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-12-22 16:39:42,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:42,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 2 conjunts are in the unsatisfiable core [2021-12-22 16:39:42,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:39:42,085 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:39:42,086 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:39:42,086 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:39:42,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [890173921] [2021-12-22 16:39:42,086 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [890173921] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:39:42,086 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:39:42,086 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 16:39:42,086 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939306190] [2021-12-22 16:39:42,086 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:39:42,087 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 16:39:42,087 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:39:42,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 16:39:42,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 16:39:42,087 INFO L87 Difference]: Start difference. First operand 212 states and 236 transitions. Second operand has 3 states, 2 states have (on average 6.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:42,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:39:42,209 INFO L93 Difference]: Finished difference Result 211 states and 235 transitions. [2021-12-22 16:39:42,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 16:39:42,210 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 6.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-12-22 16:39:42,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:39:42,211 INFO L225 Difference]: With dead ends: 211 [2021-12-22 16:39:42,211 INFO L226 Difference]: Without dead ends: 211 [2021-12-22 16:39:42,211 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 16:39:42,211 INFO L933 BasicCegarLoop]: 220 mSDtfsCounter, 2 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 358 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 16:39:42,211 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 358 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 16:39:42,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2021-12-22 16:39:42,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 211. [2021-12-22 16:39:42,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 120 states have (on average 1.6916666666666667) internal successors, (203), 196 states have internal predecessors, (203), 20 states have call successors, (20), 5 states have call predecessors, (20), 3 states have return successors, (12), 9 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-22 16:39:42,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 235 transitions. [2021-12-22 16:39:42,215 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 235 transitions. Word has length 13 [2021-12-22 16:39:42,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:39:42,216 INFO L470 AbstractCegarLoop]: Abstraction has 211 states and 235 transitions. [2021-12-22 16:39:42,216 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 6.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:39:42,216 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 235 transitions. [2021-12-22 16:39:42,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-12-22 16:39:42,216 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:42,216 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:39:42,225 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-12-22 16:39:42,416 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:39:42,417 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:42,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:42,417 INFO L85 PathProgramCache]: Analyzing trace with hash 2066019085, now seen corresponding path program 1 times [2021-12-22 16:39:42,418 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:39:42,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1684933859] [2021-12-22 16:39:42,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:42,418 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:39:42,418 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:39:42,419 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:39:42,419 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-12-22 16:39:42,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:42,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 15 conjunts are in the unsatisfiable core [2021-12-22 16:39:42,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:39:42,540 INFO L353 Elim1Store]: treesize reduction 30, result has 45.5 percent of original size [2021-12-22 16:39:42,540 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 2 case distinctions, treesize of input 12 treesize of output 30 [2021-12-22 16:39:42,655 INFO L353 Elim1Store]: treesize reduction 8, result has 60.0 percent of original size [2021-12-22 16:39:42,655 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 19 treesize of output 28 [2021-12-22 16:39:42,749 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:39:42,749 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:39:42,749 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:39:42,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1684933859] [2021-12-22 16:39:42,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1684933859] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:39:42,750 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:39:42,750 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-22 16:39:42,750 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570602336] [2021-12-22 16:39:42,750 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:39:42,750 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-22 16:39:42,750 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:39:42,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-22 16:39:42,750 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-12-22 16:39:42,751 INFO L87 Difference]: Start difference. First operand 211 states and 235 transitions. Second operand has 7 states, 5 states have (on average 3.2) internal successors, (16), 6 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) [2021-12-22 16:39:43,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:39:43,050 INFO L93 Difference]: Finished difference Result 210 states and 234 transitions. [2021-12-22 16:39:43,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-22 16:39:43,053 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 3.2) internal successors, (16), 6 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 [2021-12-22 16:39:43,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:39:43,054 INFO L225 Difference]: With dead ends: 210 [2021-12-22 16:39:43,054 INFO L226 Difference]: Without dead ends: 210 [2021-12-22 16:39:43,054 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-12-22 16:39:43,055 INFO L933 BasicCegarLoop]: 200 mSDtfsCounter, 49 mSDsluCounter, 412 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 612 SdHoareTripleChecker+Invalid, 610 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 273 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 16:39:43,055 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 612 Invalid, 610 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 319 Invalid, 0 Unknown, 273 Unchecked, 0.3s Time] [2021-12-22 16:39:43,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2021-12-22 16:39:43,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 210. [2021-12-22 16:39:43,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 120 states have (on average 1.6833333333333333) internal successors, (202), 195 states have internal predecessors, (202), 20 states have call successors, (20), 5 states have call predecessors, (20), 3 states have return successors, (12), 9 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-22 16:39:43,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 234 transitions. [2021-12-22 16:39:43,060 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 234 transitions. Word has length 18 [2021-12-22 16:39:43,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:39:43,061 INFO L470 AbstractCegarLoop]: Abstraction has 210 states and 234 transitions. [2021-12-22 16:39:43,061 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 3.2) internal successors, (16), 6 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) [2021-12-22 16:39:43,061 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 234 transitions. [2021-12-22 16:39:43,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-12-22 16:39:43,062 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:43,062 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:39:43,073 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-12-22 16:39:43,267 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:39:43,267 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:43,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:43,268 INFO L85 PathProgramCache]: Analyzing trace with hash 2066019086, now seen corresponding path program 1 times [2021-12-22 16:39:43,268 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:39:43,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1602612584] [2021-12-22 16:39:43,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:43,268 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:39:43,268 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:39:43,269 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:39:43,271 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-12-22 16:39:43,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:43,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-22 16:39:43,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:39:43,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:39:43,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:39:43,394 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-22 16:39:43,394 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 12 treesize of output 20 [2021-12-22 16:39:43,399 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 14 treesize of output 12 [2021-12-22 16:39:43,477 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-22 16:39:43,477 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 12 treesize of output 18 [2021-12-22 16:39:43,542 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:39:43,543 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:39:43,543 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:39:43,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1602612584] [2021-12-22 16:39:43,543 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1602612584] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:39:43,543 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:39:43,543 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-22 16:39:43,543 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79695911] [2021-12-22 16:39:43,543 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:39:43,543 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-22 16:39:43,544 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:39:43,544 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-22 16:39:43,544 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-22 16:39:43,544 INFO L87 Difference]: Start difference. First operand 210 states and 234 transitions. Second operand has 6 states, 4 states have (on average 4.0) internal successors, (16), 5 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) [2021-12-22 16:39:43,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:39:43,817 INFO L93 Difference]: Finished difference Result 227 states and 252 transitions. [2021-12-22 16:39:43,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-22 16:39:43,817 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 4.0) internal successors, (16), 5 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 [2021-12-22 16:39:43,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:39:43,818 INFO L225 Difference]: With dead ends: 227 [2021-12-22 16:39:43,818 INFO L226 Difference]: Without dead ends: 227 [2021-12-22 16:39:43,819 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-22 16:39:43,819 INFO L933 BasicCegarLoop]: 208 mSDtfsCounter, 45 mSDsluCounter, 377 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 585 SdHoareTripleChecker+Invalid, 463 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 261 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 16:39:43,819 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 585 Invalid, 463 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 186 Invalid, 0 Unknown, 261 Unchecked, 0.3s Time] [2021-12-22 16:39:43,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2021-12-22 16:39:43,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 225. [2021-12-22 16:39:43,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 134 states have (on average 1.626865671641791) internal successors, (218), 208 states have internal predecessors, (218), 20 states have call successors, (20), 6 states have call predecessors, (20), 4 states have return successors, (12), 10 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-22 16:39:43,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 250 transitions. [2021-12-22 16:39:43,824 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 250 transitions. Word has length 18 [2021-12-22 16:39:43,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:39:43,824 INFO L470 AbstractCegarLoop]: Abstraction has 225 states and 250 transitions. [2021-12-22 16:39:43,824 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 4.0) internal successors, (16), 5 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) [2021-12-22 16:39:43,824 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 250 transitions. [2021-12-22 16:39:43,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-12-22 16:39:43,824 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:43,824 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:39:43,833 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-12-22 16:39:44,027 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:39:44,027 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting chain_nodeErr4REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:44,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:44,028 INFO L85 PathProgramCache]: Analyzing trace with hash 823372381, now seen corresponding path program 1 times [2021-12-22 16:39:44,028 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:39:44,028 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1030483021] [2021-12-22 16:39:44,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:44,028 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:39:44,028 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:39:44,029 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:39:44,030 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-12-22 16:39:44,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:44,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-22 16:39:44,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:39:44,163 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 [2021-12-22 16:39:44,207 INFO L353 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-22 16:39:44,207 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 12 treesize of output 17 [2021-12-22 16:39:44,229 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:39:44,230 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:39:44,356 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:39:44,357 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:39:44,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1030483021] [2021-12-22 16:39:44,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1030483021] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 16:39:44,357 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:39:44,357 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-12-22 16:39:44,357 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [738363294] [2021-12-22 16:39:44,358 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:39:44,358 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-22 16:39:44,358 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:39:44,358 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-22 16:39:44,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-12-22 16:39:44,359 INFO L87 Difference]: Start difference. First operand 225 states and 250 transitions. Second operand has 7 states, 6 states have (on average 5.166666666666667) internal successors, (31), 7 states have internal predecessors, (31), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-22 16:39:44,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:39:44,687 INFO L93 Difference]: Finished difference Result 224 states and 248 transitions. [2021-12-22 16:39:44,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-22 16:39:44,687 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 5.166666666666667) internal successors, (31), 7 states have internal predecessors, (31), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2021-12-22 16:39:44,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:39:44,688 INFO L225 Difference]: With dead ends: 224 [2021-12-22 16:39:44,688 INFO L226 Difference]: Without dead ends: 224 [2021-12-22 16:39:44,689 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-12-22 16:39:44,689 INFO L933 BasicCegarLoop]: 204 mSDtfsCounter, 30 mSDsluCounter, 719 mSDsCounter, 0 mSdLazyCounter, 327 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 923 SdHoareTripleChecker+Invalid, 334 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 16:39:44,689 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 923 Invalid, 334 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 327 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-22 16:39:44,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2021-12-22 16:39:44,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 215. [2021-12-22 16:39:44,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 127 states have (on average 1.6456692913385826) internal successors, (209), 199 states have internal predecessors, (209), 18 states have call successors, (18), 5 states have call predecessors, (18), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-22 16:39:44,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 237 transitions. [2021-12-22 16:39:44,693 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 237 transitions. Word has length 24 [2021-12-22 16:39:44,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:39:44,693 INFO L470 AbstractCegarLoop]: Abstraction has 215 states and 237 transitions. [2021-12-22 16:39:44,694 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 5.166666666666667) internal successors, (31), 7 states have internal predecessors, (31), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-22 16:39:44,694 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 237 transitions. [2021-12-22 16:39:44,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-12-22 16:39:44,694 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:44,694 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-12-22 16:39:44,705 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-12-22 16:39:44,902 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:39:44,902 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:44,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:44,903 INFO L85 PathProgramCache]: Analyzing trace with hash 1607136150, now seen corresponding path program 1 times [2021-12-22 16:39:44,903 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:39:44,903 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [668773129] [2021-12-22 16:39:44,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:44,903 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:39:44,903 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:39:44,904 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:39:44,905 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-12-22 16:39:45,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:45,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 19 conjunts are in the unsatisfiable core [2021-12-22 16:39:45,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:39:45,089 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:39:45,108 INFO L353 Elim1Store]: treesize reduction 24, result has 33.3 percent of original size [2021-12-22 16:39:45,109 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 12 treesize of output 23 [2021-12-22 16:39:45,116 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 42 treesize of output 38 [2021-12-22 16:39:45,148 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 [2021-12-22 16:39:45,320 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:39:45,321 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-22 16:39:45,432 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-22 16:39:45,432 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 12 treesize of output 18 [2021-12-22 16:39:45,509 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:39:45,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:39:45,668 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:39:45,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [668773129] [2021-12-22 16:39:45,672 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [668773129] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:39:45,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1206627158] [2021-12-22 16:39:45,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:45,672 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-22 16:39:45,673 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-22 16:39:45,673 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-22 16:39:45,674 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (14)] Waiting until timeout for monitored process [2021-12-22 16:39:45,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:45,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 19 conjunts are in the unsatisfiable core [2021-12-22 16:39:45,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:39:45,929 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:39:45,947 INFO L353 Elim1Store]: treesize reduction 24, result has 33.3 percent of original size [2021-12-22 16:39:45,947 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 12 treesize of output 23 [2021-12-22 16:39:45,954 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 39 treesize of output 37 [2021-12-22 16:39:45,976 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 [2021-12-22 16:39:46,097 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:39:46,098 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-22 16:39:46,143 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 [2021-12-22 16:39:46,299 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:39:46,300 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-22 16:39:46,327 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-12-22 16:39:46,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:39:48,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1206627158] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:39:48,466 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:39:48,466 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 10 [2021-12-22 16:39:48,466 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387397775] [2021-12-22 16:39:48,466 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:39:48,467 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-22 16:39:48,467 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:39:48,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-22 16:39:48,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=139, Unknown=1, NotChecked=0, Total=182 [2021-12-22 16:39:48,467 INFO L87 Difference]: Start difference. First operand 215 states and 237 transitions. Second operand has 11 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 8 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-22 16:39:48,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:39:48,921 INFO L93 Difference]: Finished difference Result 230 states and 254 transitions. [2021-12-22 16:39:48,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-22 16:39:48,921 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 8 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 32 [2021-12-22 16:39:48,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:39:48,922 INFO L225 Difference]: With dead ends: 230 [2021-12-22 16:39:48,922 INFO L226 Difference]: Without dead ends: 230 [2021-12-22 16:39:48,923 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=55, Invalid=184, Unknown=1, NotChecked=0, Total=240 [2021-12-22 16:39:48,923 INFO L933 BasicCegarLoop]: 208 mSDtfsCounter, 57 mSDsluCounter, 539 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 747 SdHoareTripleChecker+Invalid, 798 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 525 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-22 16:39:48,923 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 747 Invalid, 798 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 254 Invalid, 0 Unknown, 525 Unchecked, 0.4s Time] [2021-12-22 16:39:48,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2021-12-22 16:39:48,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 224. [2021-12-22 16:39:48,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 135 states have (on average 1.5925925925925926) internal successors, (215), 208 states have internal predecessors, (215), 19 states have call successors, (19), 6 states have call predecessors, (19), 5 states have return successors, (11), 9 states have call predecessors, (11), 11 states have call successors, (11) [2021-12-22 16:39:48,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 245 transitions. [2021-12-22 16:39:48,927 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 245 transitions. Word has length 32 [2021-12-22 16:39:48,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:39:48,928 INFO L470 AbstractCegarLoop]: Abstraction has 224 states and 245 transitions. [2021-12-22 16:39:48,928 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 8 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-22 16:39:48,929 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 245 transitions. [2021-12-22 16:39:48,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-12-22 16:39:48,934 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:48,934 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:39:48,941 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (14)] Forceful destruction successful, exit code 0 [2021-12-22 16:39:49,143 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-12-22 16:39:49,335 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:39:49,335 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:49,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:49,336 INFO L85 PathProgramCache]: Analyzing trace with hash 230094096, now seen corresponding path program 1 times [2021-12-22 16:39:49,336 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:39:49,336 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1346630303] [2021-12-22 16:39:49,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:49,336 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:39:49,336 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:39:49,337 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:39:49,347 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-12-22 16:39:49,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:49,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-22 16:39:49,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:39:49,562 INFO L353 Elim1Store]: treesize reduction 30, result has 45.5 percent of original size [2021-12-22 16:39:49,563 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 3 case distinctions, treesize of input 22 treesize of output 37 [2021-12-22 16:39:49,609 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 12 treesize of output 10 [2021-12-22 16:39:49,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:39:49,743 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 21 [2021-12-22 16:39:49,810 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 12 treesize of output 10 [2021-12-22 16:39:49,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:39:49,994 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 21 [2021-12-22 16:39:50,082 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:39:50,083 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:39:50,083 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:39:50,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1346630303] [2021-12-22 16:39:50,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1346630303] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:39:50,083 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:39:50,083 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-12-22 16:39:50,084 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [94189795] [2021-12-22 16:39:50,084 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:39:50,084 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-22 16:39:50,084 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:39:50,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-22 16:39:50,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-12-22 16:39:50,085 INFO L87 Difference]: Start difference. First operand 224 states and 245 transitions. Second operand has 10 states, 8 states have (on average 3.875) internal successors, (31), 8 states have internal predecessors, (31), 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) [2021-12-22 16:39:50,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:39:50,325 INFO L93 Difference]: Finished difference Result 240 states and 263 transitions. [2021-12-22 16:39:50,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-22 16:39:50,325 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 3.875) internal successors, (31), 8 states have internal predecessors, (31), 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 35 [2021-12-22 16:39:50,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:39:50,339 INFO L225 Difference]: With dead ends: 240 [2021-12-22 16:39:50,339 INFO L226 Difference]: Without dead ends: 240 [2021-12-22 16:39:50,340 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-12-22 16:39:50,341 INFO L933 BasicCegarLoop]: 215 mSDtfsCounter, 7 mSDsluCounter, 640 mSDsCounter, 0 mSdLazyCounter, 202 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 855 SdHoareTripleChecker+Invalid, 678 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 475 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 16:39:50,341 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 855 Invalid, 678 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 202 Invalid, 0 Unknown, 475 Unchecked, 0.2s Time] [2021-12-22 16:39:50,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2021-12-22 16:39:50,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 226. [2021-12-22 16:39:50,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 138 states have (on average 1.5942028985507246) internal successors, (220), 209 states have internal predecessors, (220), 18 states have call successors, (18), 6 states have call predecessors, (18), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-22 16:39:50,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 248 transitions. [2021-12-22 16:39:50,350 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 248 transitions. Word has length 35 [2021-12-22 16:39:50,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:39:50,351 INFO L470 AbstractCegarLoop]: Abstraction has 226 states and 248 transitions. [2021-12-22 16:39:50,351 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 3.875) internal successors, (31), 8 states have internal predecessors, (31), 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) [2021-12-22 16:39:50,351 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 248 transitions. [2021-12-22 16:39:50,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-12-22 16:39:50,352 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:50,352 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:39:50,363 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-12-22 16:39:50,560 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:39:50,561 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:50,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:50,561 INFO L85 PathProgramCache]: Analyzing trace with hash 230094097, now seen corresponding path program 1 times [2021-12-22 16:39:50,562 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:39:50,562 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [987461857] [2021-12-22 16:39:50,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:50,562 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:39:50,562 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:39:50,563 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:39:50,564 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-12-22 16:39:50,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:50,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 28 conjunts are in the unsatisfiable core [2021-12-22 16:39:50,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:39:50,754 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:39:50,773 INFO L353 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-12-22 16:39:50,773 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 12 treesize of output 20 [2021-12-22 16:39:50,777 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 10 treesize of output 8 [2021-12-22 16:39:50,807 INFO L353 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-12-22 16:39:50,807 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 7 [2021-12-22 16:39:50,976 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:39:50,988 INFO L353 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2021-12-22 16:39:50,988 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 26 [2021-12-22 16:39:51,113 INFO L353 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-12-22 16:39:51,113 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 16 [2021-12-22 16:39:51,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:39:51,261 INFO L353 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2021-12-22 16:39:51,261 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 35 [2021-12-22 16:39:51,357 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:39:51,358 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:39:51,358 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:39:51,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [987461857] [2021-12-22 16:39:51,358 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [987461857] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:39:51,358 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:39:51,358 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-12-22 16:39:51,358 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098870725] [2021-12-22 16:39:51,358 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:39:51,358 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-22 16:39:51,358 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:39:51,359 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-22 16:39:51,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-12-22 16:39:51,359 INFO L87 Difference]: Start difference. First operand 226 states and 248 transitions. Second operand has 9 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 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) [2021-12-22 16:39:51,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:39:51,765 INFO L93 Difference]: Finished difference Result 261 states and 287 transitions. [2021-12-22 16:39:51,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-22 16:39:51,765 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 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 35 [2021-12-22 16:39:51,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:39:51,766 INFO L225 Difference]: With dead ends: 261 [2021-12-22 16:39:51,767 INFO L226 Difference]: Without dead ends: 261 [2021-12-22 16:39:51,767 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-12-22 16:39:51,767 INFO L933 BasicCegarLoop]: 217 mSDtfsCounter, 2 mSDsluCounter, 649 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 866 SdHoareTripleChecker+Invalid, 481 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 208 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-22 16:39:51,767 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 866 Invalid, 481 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 271 Invalid, 0 Unknown, 208 Unchecked, 0.4s Time] [2021-12-22 16:39:51,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2021-12-22 16:39:51,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 260. [2021-12-22 16:39:51,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 260 states, 167 states have (on average 1.5029940119760479) internal successors, (251), 239 states have internal predecessors, (251), 21 states have call successors, (21), 8 states have call predecessors, (21), 7 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2021-12-22 16:39:51,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 285 transitions. [2021-12-22 16:39:51,773 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 285 transitions. Word has length 35 [2021-12-22 16:39:51,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:39:51,773 INFO L470 AbstractCegarLoop]: Abstraction has 260 states and 285 transitions. [2021-12-22 16:39:51,773 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 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) [2021-12-22 16:39:51,773 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 285 transitions. [2021-12-22 16:39:51,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-12-22 16:39:51,774 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:51,774 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:39:51,785 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-12-22 16:39:51,979 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:39:51,979 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:51,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:51,980 INFO L85 PathProgramCache]: Analyzing trace with hash -304151576, now seen corresponding path program 1 times [2021-12-22 16:39:51,980 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:39:51,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1972322922] [2021-12-22 16:39:51,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:51,980 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:39:51,980 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:39:51,982 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:39:51,982 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-12-22 16:39:52,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:52,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 29 conjunts are in the unsatisfiable core [2021-12-22 16:39:52,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:39:52,237 INFO L353 Elim1Store]: treesize reduction 30, result has 45.5 percent of original size [2021-12-22 16:39:52,238 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 3 case distinctions, treesize of input 22 treesize of output 37 [2021-12-22 16:39:52,274 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-12-22 16:39:52,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:39:52,431 INFO L353 Elim1Store]: treesize reduction 8, result has 60.0 percent of original size [2021-12-22 16:39:52,431 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 31 treesize of output 43 [2021-12-22 16:39:53,089 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-12-22 16:39:53,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:39:53,256 INFO L353 Elim1Store]: treesize reduction 8, result has 60.0 percent of original size [2021-12-22 16:39:53,256 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 36 treesize of output 48 [2021-12-22 16:39:53,726 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-12-22 16:39:53,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:39:53,944 INFO L353 Elim1Store]: treesize reduction 8, result has 60.0 percent of original size [2021-12-22 16:39:53,944 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 36 treesize of output 48 [2021-12-22 16:39:54,273 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 24 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-22 16:39:54,274 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:39:54,356 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:39:54,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1972322922] [2021-12-22 16:39:54,356 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1972322922] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:39:54,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1075730045] [2021-12-22 16:39:54,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:54,356 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-22 16:39:54,356 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-22 16:39:54,358 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-22 16:39:54,359 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2021-12-22 16:39:54,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:54,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-22 16:39:54,747 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:39:54,809 INFO L353 Elim1Store]: treesize reduction 76, result has 35.0 percent of original size [2021-12-22 16:39:54,810 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 5 case distinctions, treesize of input 27 treesize of output 56 [2021-12-22 16:39:54,897 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:39:54,898 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 28 [2021-12-22 16:39:55,025 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:39:55,039 INFO L353 Elim1Store]: treesize reduction 16, result has 42.9 percent of original size [2021-12-22 16:39:55,040 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 30 treesize of output 42 [2021-12-22 16:39:55,285 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:39:55,286 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 34 [2021-12-22 16:39:55,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:39:55,554 INFO L353 Elim1Store]: treesize reduction 16, result has 42.9 percent of original size [2021-12-22 16:39:55,554 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 36 treesize of output 48 [2021-12-22 16:39:55,972 INFO L353 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-12-22 16:39:55,973 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 36 [2021-12-22 16:39:56,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:39:56,135 INFO L353 Elim1Store]: treesize reduction 16, result has 42.9 percent of original size [2021-12-22 16:39:56,136 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 50 treesize of output 58 [2021-12-22 16:39:57,239 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 14 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-22 16:39:57,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:39:57,302 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1075730045] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:39:57,303 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:39:57,303 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 16 [2021-12-22 16:39:57,303 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109442917] [2021-12-22 16:39:57,303 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:39:57,303 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-22 16:39:57,303 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:39:57,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-22 16:39:57,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=318, Unknown=0, NotChecked=0, Total=380 [2021-12-22 16:39:57,304 INFO L87 Difference]: Start difference. First operand 260 states and 285 transitions. Second operand has 17 states, 14 states have (on average 3.857142857142857) internal successors, (54), 15 states have internal predecessors, (54), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-22 16:39:57,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:39:57,696 INFO L93 Difference]: Finished difference Result 288 states and 314 transitions. [2021-12-22 16:39:57,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-22 16:39:57,697 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 14 states have (on average 3.857142857142857) internal successors, (54), 15 states have internal predecessors, (54), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 49 [2021-12-22 16:39:57,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:39:57,699 INFO L225 Difference]: With dead ends: 288 [2021-12-22 16:39:57,699 INFO L226 Difference]: Without dead ends: 288 [2021-12-22 16:39:57,699 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 83 SyntacticMatches, 6 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=93, Invalid=459, Unknown=0, NotChecked=0, Total=552 [2021-12-22 16:39:57,699 INFO L933 BasicCegarLoop]: 215 mSDtfsCounter, 9 mSDsluCounter, 1202 mSDsCounter, 0 mSdLazyCounter, 261 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 1417 SdHoareTripleChecker+Invalid, 634 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 261 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 372 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 16:39:57,700 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 1417 Invalid, 634 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 261 Invalid, 0 Unknown, 372 Unchecked, 0.2s Time] [2021-12-22 16:39:57,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2021-12-22 16:39:57,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 273. [2021-12-22 16:39:57,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 273 states, 179 states have (on average 1.4748603351955307) internal successors, (264), 250 states have internal predecessors, (264), 21 states have call successors, (21), 9 states have call predecessors, (21), 8 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-12-22 16:39:57,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 298 transitions. [2021-12-22 16:39:57,705 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 298 transitions. Word has length 49 [2021-12-22 16:39:57,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:39:57,705 INFO L470 AbstractCegarLoop]: Abstraction has 273 states and 298 transitions. [2021-12-22 16:39:57,705 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 14 states have (on average 3.857142857142857) internal successors, (54), 15 states have internal predecessors, (54), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-22 16:39:57,705 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 298 transitions. [2021-12-22 16:39:57,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-12-22 16:39:57,706 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:39:57,706 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:39:57,721 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Ended with exit code 0 [2021-12-22 16:39:57,918 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (18)] Forceful destruction successful, exit code 0 [2021-12-22 16:39:58,115 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2021-12-22 16:39:58,116 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:39:58,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:39:58,116 INFO L85 PathProgramCache]: Analyzing trace with hash -304151575, now seen corresponding path program 1 times [2021-12-22 16:39:58,116 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:39:58,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1268599560] [2021-12-22 16:39:58,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:39:58,116 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:39:58,117 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:39:58,117 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:39:58,119 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-12-22 16:39:58,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:39:58,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 38 conjunts are in the unsatisfiable core [2021-12-22 16:39:58,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:39:58,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:39:58,408 INFO L353 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-12-22 16:39:58,409 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 12 treesize of output 20 [2021-12-22 16:39:58,412 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 10 treesize of output 8 [2021-12-22 16:39:58,445 INFO L353 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-12-22 16:39:58,446 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 7 [2021-12-22 16:39:58,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:39:58,637 INFO L353 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2021-12-22 16:39:58,637 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 26 [2021-12-22 16:39:58,804 INFO L353 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-12-22 16:39:58,804 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 16 [2021-12-22 16:39:58,810 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 8 treesize of output 6 [2021-12-22 16:40:01,005 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:40:01,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:40:01,011 INFO L353 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-12-22 16:40:01,011 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 26 treesize of output 31 [2021-12-22 16:40:01,021 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-22 16:40:01,021 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-22 16:40:01,135 INFO L353 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-12-22 16:40:01,135 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 11 [2021-12-22 16:40:01,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:40:01,321 INFO L353 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2021-12-22 16:40:01,321 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 21 treesize of output 30 [2021-12-22 16:40:01,988 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:40:01,988 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:40:02,173 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:40:02,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1268599560] [2021-12-22 16:40:02,173 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1268599560] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:40:02,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1369261155] [2021-12-22 16:40:02,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:40:02,173 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-22 16:40:02,174 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-22 16:40:02,174 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-22 16:40:02,175 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2021-12-22 16:40:02,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:40:02,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 25 conjunts are in the unsatisfiable core [2021-12-22 16:40:02,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:40:02,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:40:02,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:40:02,598 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-22 16:40:02,598 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 12 treesize of output 20 [2021-12-22 16:40:02,611 INFO L353 Elim1Store]: treesize reduction 2, result has 75.0 percent of original size [2021-12-22 16:40:02,611 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 90 [2021-12-22 16:40:02,678 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 [2021-12-22 16:40:02,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:40:02,825 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-22 16:40:02,902 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 [2021-12-22 16:40:03,064 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:40:03,065 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-22 16:40:03,088 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 [2021-12-22 16:40:03,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:40:03,252 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-22 16:40:03,328 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-12-22 16:40:03,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:40:03,496 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1369261155] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:40:03,497 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:40:03,497 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7] total 16 [2021-12-22 16:40:03,497 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1797015565] [2021-12-22 16:40:03,497 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:40:03,497 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-22 16:40:03,497 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:40:03,498 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-22 16:40:03,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=303, Unknown=1, NotChecked=0, Total=380 [2021-12-22 16:40:03,498 INFO L87 Difference]: Start difference. First operand 273 states and 298 transitions. Second operand has 17 states, 14 states have (on average 4.571428571428571) internal successors, (64), 14 states have internal predecessors, (64), 5 states have call successors, (5), 3 states have call predecessors, (5), 4 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-22 16:40:04,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:40:04,164 INFO L93 Difference]: Finished difference Result 290 states and 317 transitions. [2021-12-22 16:40:04,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-12-22 16:40:04,165 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 14 states have (on average 4.571428571428571) internal successors, (64), 14 states have internal predecessors, (64), 5 states have call successors, (5), 3 states have call predecessors, (5), 4 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 49 [2021-12-22 16:40:04,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:40:04,166 INFO L225 Difference]: With dead ends: 290 [2021-12-22 16:40:04,166 INFO L226 Difference]: Without dead ends: 290 [2021-12-22 16:40:04,167 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 85 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=109, Invalid=490, Unknown=1, NotChecked=0, Total=600 [2021-12-22 16:40:04,167 INFO L933 BasicCegarLoop]: 215 mSDtfsCounter, 25 mSDsluCounter, 1120 mSDsCounter, 0 mSdLazyCounter, 309 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 1335 SdHoareTripleChecker+Invalid, 745 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 309 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 430 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-22 16:40:04,167 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 1335 Invalid, 745 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 309 Invalid, 0 Unknown, 430 Unchecked, 0.4s Time] [2021-12-22 16:40:04,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2021-12-22 16:40:04,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 268. [2021-12-22 16:40:04,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 268 states, 176 states have (on average 1.4659090909090908) internal successors, (258), 246 states have internal predecessors, (258), 20 states have call successors, (20), 9 states have call predecessors, (20), 8 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-22 16:40:04,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 290 transitions. [2021-12-22 16:40:04,172 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 290 transitions. Word has length 49 [2021-12-22 16:40:04,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:40:04,179 INFO L470 AbstractCegarLoop]: Abstraction has 268 states and 290 transitions. [2021-12-22 16:40:04,179 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 14 states have (on average 4.571428571428571) internal successors, (64), 14 states have internal predecessors, (64), 5 states have call successors, (5), 3 states have call predecessors, (5), 4 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-22 16:40:04,179 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 290 transitions. [2021-12-22 16:40:04,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-12-22 16:40:04,180 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:40:04,180 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 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] [2021-12-22 16:40:04,185 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (20)] Forceful destruction successful, exit code 0 [2021-12-22 16:40:04,393 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Ended with exit code 0 [2021-12-22 16:40:04,584 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:40:04,585 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:40:04,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:40:04,585 INFO L85 PathProgramCache]: Analyzing trace with hash 742718239, now seen corresponding path program 1 times [2021-12-22 16:40:04,585 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:40:04,585 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1305914677] [2021-12-22 16:40:04,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:40:04,585 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:40:04,586 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:40:04,586 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:40:04,588 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-12-22 16:40:04,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:40:04,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-22 16:40:04,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:40:04,877 INFO L353 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-12-22 16:40:04,878 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 19 [2021-12-22 16:40:05,088 INFO L353 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-22 16:40:05,088 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 24 [2021-12-22 16:40:05,105 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-22 16:40:05,116 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-22 16:40:05,116 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:40:05,116 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:40:05,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1305914677] [2021-12-22 16:40:05,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1305914677] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:40:05,116 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:40:05,116 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-22 16:40:05,117 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [237703088] [2021-12-22 16:40:05,117 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:40:05,117 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-22 16:40:05,117 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:40:05,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-22 16:40:05,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-12-22 16:40:05,118 INFO L87 Difference]: Start difference. First operand 268 states and 290 transitions. Second operand has 7 states, 6 states have (on average 6.333333333333333) internal successors, (38), 6 states have internal predecessors, (38), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-22 16:40:05,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:40:05,525 INFO L93 Difference]: Finished difference Result 274 states and 298 transitions. [2021-12-22 16:40:05,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-22 16:40:05,525 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 6.333333333333333) internal successors, (38), 6 states have internal predecessors, (38), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 55 [2021-12-22 16:40:05,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:40:05,526 INFO L225 Difference]: With dead ends: 274 [2021-12-22 16:40:05,526 INFO L226 Difference]: Without dead ends: 274 [2021-12-22 16:40:05,526 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-12-22 16:40:05,527 INFO L933 BasicCegarLoop]: 131 mSDtfsCounter, 161 mSDsluCounter, 317 mSDsCounter, 0 mSdLazyCounter, 446 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 167 SdHoareTripleChecker+Valid, 448 SdHoareTripleChecker+Invalid, 616 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 446 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 145 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-22 16:40:05,527 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [167 Valid, 448 Invalid, 616 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 446 Invalid, 0 Unknown, 145 Unchecked, 0.4s Time] [2021-12-22 16:40:05,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2021-12-22 16:40:05,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 261. [2021-12-22 16:40:05,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 176 states have (on average 1.4261363636363635) internal successors, (251), 239 states have internal predecessors, (251), 20 states have call successors, (20), 9 states have call predecessors, (20), 8 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-22 16:40:05,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 283 transitions. [2021-12-22 16:40:05,531 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 283 transitions. Word has length 55 [2021-12-22 16:40:05,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:40:05,532 INFO L470 AbstractCegarLoop]: Abstraction has 261 states and 283 transitions. [2021-12-22 16:40:05,532 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 6.333333333333333) internal successors, (38), 6 states have internal predecessors, (38), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-22 16:40:05,532 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 283 transitions. [2021-12-22 16:40:05,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-12-22 16:40:05,532 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:40:05,533 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 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] [2021-12-22 16:40:05,547 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Ended with exit code 0 [2021-12-22 16:40:05,742 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:40:05,743 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:40:05,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:40:05,743 INFO L85 PathProgramCache]: Analyzing trace with hash 742718240, now seen corresponding path program 1 times [2021-12-22 16:40:05,743 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:40:05,743 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1194424134] [2021-12-22 16:40:05,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:40:05,744 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:40:05,744 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:40:05,744 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:40:05,746 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-12-22 16:40:05,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:40:05,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 15 conjunts are in the unsatisfiable core [2021-12-22 16:40:05,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:40:06,031 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 [2021-12-22 16:40:06,180 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:40:06,181 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-12-22 16:40:06,188 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-22 16:40:06,188 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-12-22 16:40:06,224 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-22 16:40:06,224 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:40:06,224 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:40:06,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1194424134] [2021-12-22 16:40:06,224 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1194424134] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:40:06,224 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:40:06,224 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-22 16:40:06,225 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1406168799] [2021-12-22 16:40:06,225 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:40:06,225 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-22 16:40:06,225 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:40:06,225 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-22 16:40:06,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-12-22 16:40:06,225 INFO L87 Difference]: Start difference. First operand 261 states and 283 transitions. Second operand has 7 states, 6 states have (on average 6.333333333333333) internal successors, (38), 6 states have internal predecessors, (38), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-22 16:40:06,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:40:06,985 INFO L93 Difference]: Finished difference Result 386 states and 424 transitions. [2021-12-22 16:40:06,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-22 16:40:06,986 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 6.333333333333333) internal successors, (38), 6 states have internal predecessors, (38), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 55 [2021-12-22 16:40:06,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:40:06,987 INFO L225 Difference]: With dead ends: 386 [2021-12-22 16:40:06,987 INFO L226 Difference]: Without dead ends: 386 [2021-12-22 16:40:06,988 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-12-22 16:40:06,988 INFO L933 BasicCegarLoop]: 126 mSDtfsCounter, 163 mSDsluCounter, 318 mSDsCounter, 0 mSdLazyCounter, 570 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 169 SdHoareTripleChecker+Valid, 444 SdHoareTripleChecker+Invalid, 780 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 570 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 173 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-22 16:40:06,988 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [169 Valid, 444 Invalid, 780 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 570 Invalid, 0 Unknown, 173 Unchecked, 0.7s Time] [2021-12-22 16:40:06,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 386 states. [2021-12-22 16:40:06,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 386 to 322. [2021-12-22 16:40:06,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 231 states have (on average 1.4891774891774892) internal successors, (344), 294 states have internal predecessors, (344), 26 states have call successors, (26), 9 states have call predecessors, (26), 8 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-12-22 16:40:06,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 388 transitions. [2021-12-22 16:40:06,994 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 388 transitions. Word has length 55 [2021-12-22 16:40:06,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:40:06,994 INFO L470 AbstractCegarLoop]: Abstraction has 322 states and 388 transitions. [2021-12-22 16:40:06,994 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 6.333333333333333) internal successors, (38), 6 states have internal predecessors, (38), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-22 16:40:06,994 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 388 transitions. [2021-12-22 16:40:06,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-12-22 16:40:06,995 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:40:06,995 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 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] [2021-12-22 16:40:07,006 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-12-22 16:40:07,204 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:40:07,204 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:40:07,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:40:07,205 INFO L85 PathProgramCache]: Analyzing trace with hash 1549429147, now seen corresponding path program 1 times [2021-12-22 16:40:07,205 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:40:07,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1622984917] [2021-12-22 16:40:07,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:40:07,205 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:40:07,205 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:40:07,206 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:40:07,207 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-12-22 16:40:07,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:40:07,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-22 16:40:07,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:40:07,457 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 39 treesize of output 37 [2021-12-22 16:40:07,535 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 [2021-12-22 16:40:07,664 INFO L353 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-22 16:40:07,664 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 24 [2021-12-22 16:40:07,705 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 [2021-12-22 16:40:07,814 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:40:07,815 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 12 treesize of output 14 [2021-12-22 16:40:07,871 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-22 16:40:07,910 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 24 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 16:40:07,910 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:40:07,990 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:40:07,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1622984917] [2021-12-22 16:40:07,990 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1622984917] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:40:07,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1590443702] [2021-12-22 16:40:07,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:40:07,990 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-22 16:40:07,990 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-22 16:40:07,991 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-22 16:40:07,992 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-12-22 16:40:08,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:40:08,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-22 16:40:08,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:40:08,473 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:40:08,474 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 48 [2021-12-22 16:40:08,545 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 [2021-12-22 16:40:08,662 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:40:08,663 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 12 treesize of output 14 [2021-12-22 16:40:08,727 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 [2021-12-22 16:40:08,855 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:40:08,856 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 12 treesize of output 14 [2021-12-22 16:40:08,889 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-22 16:40:08,909 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-12-22 16:40:08,910 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:40:08,910 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1590443702] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:40:08,910 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-22 16:40:08,910 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [9] total 12 [2021-12-22 16:40:08,910 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1078091457] [2021-12-22 16:40:08,910 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:40:08,911 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-22 16:40:08,911 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:40:08,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-22 16:40:08,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2021-12-22 16:40:08,911 INFO L87 Difference]: Start difference. First operand 322 states and 388 transitions. Second operand has 12 states, 11 states have (on average 3.6363636363636362) internal successors, (40), 9 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-22 16:40:09,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:40:09,187 INFO L93 Difference]: Finished difference Result 337 states and 403 transitions. [2021-12-22 16:40:09,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-12-22 16:40:09,187 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 3.6363636363636362) internal successors, (40), 9 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 56 [2021-12-22 16:40:09,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:40:09,188 INFO L225 Difference]: With dead ends: 337 [2021-12-22 16:40:09,188 INFO L226 Difference]: Without dead ends: 337 [2021-12-22 16:40:09,189 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 101 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=80, Invalid=300, Unknown=0, NotChecked=0, Total=380 [2021-12-22 16:40:09,189 INFO L933 BasicCegarLoop]: 194 mSDtfsCounter, 31 mSDsluCounter, 636 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 830 SdHoareTripleChecker+Invalid, 236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 98 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 16:40:09,189 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 830 Invalid, 236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 126 Invalid, 0 Unknown, 98 Unchecked, 0.2s Time] [2021-12-22 16:40:09,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2021-12-22 16:40:09,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 334. [2021-12-22 16:40:09,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 334 states, 242 states have (on average 1.462809917355372) internal successors, (354), 305 states have internal predecessors, (354), 26 states have call successors, (26), 10 states have call predecessors, (26), 9 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-12-22 16:40:09,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 398 transitions. [2021-12-22 16:40:09,196 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 398 transitions. Word has length 56 [2021-12-22 16:40:09,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:40:09,196 INFO L470 AbstractCegarLoop]: Abstraction has 334 states and 398 transitions. [2021-12-22 16:40:09,196 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 3.6363636363636362) internal successors, (40), 9 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-22 16:40:09,197 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 398 transitions. [2021-12-22 16:40:09,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-12-22 16:40:09,197 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:40:09,197 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 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] [2021-12-22 16:40:09,204 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (24)] Forceful destruction successful, exit code 0 [2021-12-22 16:40:09,413 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-12-22 16:40:09,602 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:40:09,602 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:40:09,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:40:09,602 INFO L85 PathProgramCache]: Analyzing trace with hash 1549429148, now seen corresponding path program 1 times [2021-12-22 16:40:09,603 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:40:09,603 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1981802067] [2021-12-22 16:40:09,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:40:09,603 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:40:09,603 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:40:09,604 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:40:09,604 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-12-22 16:40:09,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:40:09,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 19 conjunts are in the unsatisfiable core [2021-12-22 16:40:09,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:40:09,887 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 [2021-12-22 16:40:10,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:40:10,052 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-12-22 16:40:10,059 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-22 16:40:10,059 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-12-22 16:40:10,167 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-22 16:40:10,175 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 14 treesize of output 20 [2021-12-22 16:40:10,281 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 24 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:40:10,282 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:40:10,474 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:40:10,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1981802067] [2021-12-22 16:40:10,474 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1981802067] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:40:10,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [139752551] [2021-12-22 16:40:10,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:40:10,474 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-22 16:40:10,474 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-22 16:40:10,475 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-22 16:40:10,476 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-12-22 16:40:10,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:40:10,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 21 conjunts are in the unsatisfiable core [2021-12-22 16:40:10,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:40:10,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:40:10,893 INFO L353 Elim1Store]: treesize reduction 24, result has 33.3 percent of original size [2021-12-22 16:40:10,893 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 12 treesize of output 23 [2021-12-22 16:40:10,907 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 39 treesize of output 37 [2021-12-22 16:40:10,955 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 [2021-12-22 16:40:11,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:40:11,111 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-22 16:40:11,182 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 [2021-12-22 16:40:11,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:40:11,343 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-22 16:40:11,396 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 [2021-12-22 16:40:11,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:40:11,543 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-22 16:40:11,628 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-12-22 16:40:11,628 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:40:11,629 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [139752551] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:40:11,629 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-22 16:40:11,629 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [9] total 15 [2021-12-22 16:40:11,629 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1457853783] [2021-12-22 16:40:11,629 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:40:11,629 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-22 16:40:11,629 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:40:11,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-22 16:40:11,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-12-22 16:40:11,630 INFO L87 Difference]: Start difference. First operand 334 states and 398 transitions. Second operand has 8 states, 6 states have (on average 4.833333333333333) internal successors, (29), 6 states have internal predecessors, (29), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-22 16:40:11,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:40:11,927 INFO L93 Difference]: Finished difference Result 335 states and 399 transitions. [2021-12-22 16:40:11,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-22 16:40:11,931 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 4.833333333333333) internal successors, (29), 6 states have internal predecessors, (29), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 56 [2021-12-22 16:40:11,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:40:11,932 INFO L225 Difference]: With dead ends: 335 [2021-12-22 16:40:11,932 INFO L226 Difference]: Without dead ends: 335 [2021-12-22 16:40:11,932 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 100 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-12-22 16:40:11,933 INFO L933 BasicCegarLoop]: 198 mSDtfsCounter, 23 mSDsluCounter, 414 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 612 SdHoareTripleChecker+Invalid, 404 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 205 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 16:40:11,933 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 612 Invalid, 404 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 196 Invalid, 0 Unknown, 205 Unchecked, 0.3s Time] [2021-12-22 16:40:11,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 335 states. [2021-12-22 16:40:11,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 335 to 334. [2021-12-22 16:40:11,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 334 states, 242 states have (on average 1.4586776859504131) internal successors, (353), 305 states have internal predecessors, (353), 26 states have call successors, (26), 10 states have call predecessors, (26), 9 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-12-22 16:40:11,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 397 transitions. [2021-12-22 16:40:11,938 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 397 transitions. Word has length 56 [2021-12-22 16:40:11,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:40:11,938 INFO L470 AbstractCegarLoop]: Abstraction has 334 states and 397 transitions. [2021-12-22 16:40:11,938 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 4.833333333333333) internal successors, (29), 6 states have internal predecessors, (29), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-22 16:40:11,938 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 397 transitions. [2021-12-22 16:40:11,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-12-22 16:40:11,939 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:40:11,939 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 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, 1, 1] [2021-12-22 16:40:11,953 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-12-22 16:40:12,152 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (26)] Ended with exit code 0 [2021-12-22 16:40:12,348 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2021-12-22 16:40:12,348 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting failErr0ASSERT_VIOLATIONMEMORY_LEAK === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATION, check_seq_nextErr1REQUIRES_VIOLATION, check_seq_nextErr2REQUIRES_VIOLATION (and 79 more)] === [2021-12-22 16:40:12,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:40:12,349 INFO L85 PathProgramCache]: Analyzing trace with hash -1700762914, now seen corresponding path program 1 times [2021-12-22 16:40:12,349 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:40:12,349 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1642669265] [2021-12-22 16:40:12,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:40:12,349 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:40:12,349 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:40:12,350 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:40:12,350 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-12-22 16:40:12,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:40:12,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 395 conjuncts, 43 conjunts are in the unsatisfiable core [2021-12-22 16:40:12,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:40:12,793 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 [2021-12-22 16:40:12,891 INFO L353 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-12-22 16:40:12,893 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 24 treesize of output 19 [2021-12-22 16:40:13,212 WARN L860 $PredicateComparison]: unable to prove that (exists ((|chain_node_~node~0#1.base| (_ BitVec 32)) (v_ArrVal_1745 (Array (_ BitVec 32) (_ BitVec 32)))) (and (not (= |chain_node_~node~0#1.base| (_ bv0 32))) (= (let ((.cse0 (store |c_old(#memory_$Pointer$.base)| |chain_node_~node~0#1.base| v_ArrVal_1745))) (store .cse0 |c_chain_node_#in~ppnode#1.base| (store (select .cse0 |c_chain_node_#in~ppnode#1.base|) |c_chain_node_#in~ppnode#1.offset| |chain_node_~node~0#1.base|))) |c_#memory_$Pointer$.base|) (= (_ bv0 1) (select |c_old(#valid)| |chain_node_~node~0#1.base|)))) is different from true [2021-12-22 16:40:13,241 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:40:13,311 INFO L353 Elim1Store]: treesize reduction 52, result has 46.4 percent of original size [2021-12-22 16:40:13,311 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 56 treesize of output 90 [2021-12-22 16:40:13,330 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-22 16:40:13,331 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-12-22 16:40:13,350 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 8 treesize of output 7 [2021-12-22 16:40:13,492 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-12-22 16:40:13,522 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 23 [2021-12-22 16:40:13,578 WARN L220 Elim1Store]: Array PQE input equivalent to false [2021-12-22 16:40:13,640 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 18 treesize of output 14 [2021-12-22 16:40:13,656 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:40:13,657 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 17 [2021-12-22 16:40:13,846 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 48 [2021-12-22 16:40:13,884 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-12-22 16:40:13,933 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 15 treesize of output 12 [2021-12-22 16:40:14,350 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:40:14,350 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 67 treesize of output 89 [2021-12-22 16:40:14,388 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 [2021-12-22 16:40:14,496 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 12 treesize of output 8 [2021-12-22 16:40:14,553 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 33 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 2 not checked. [2021-12-22 16:40:14,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:40:14,740 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:40:14,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1642669265] [2021-12-22 16:40:14,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1642669265] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:40:14,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1868314461] [2021-12-22 16:40:14,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:40:14,741 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-22 16:40:14,741 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-22 16:40:14,742 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-22 16:40:14,743 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-12-22 16:40:15,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:40:15,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 395 conjuncts, 39 conjunts are in the unsatisfiable core [2021-12-22 16:40:15,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:40:15,496 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 [2021-12-22 16:40:19,694 INFO L353 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-12-22 16:40:19,694 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 24 treesize of output 19 [2021-12-22 16:40:19,759 INFO L353 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-12-22 16:40:19,760 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 8 [2021-12-22 16:40:20,318 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:40:20,361 INFO L353 Elim1Store]: treesize reduction 20, result has 57.4 percent of original size [2021-12-22 16:40:20,361 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 2 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 45 [2021-12-22 16:40:20,378 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 20 treesize of output 16 [2021-12-22 16:40:20,534 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 [2021-12-22 16:40:24,645 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-12-22 16:40:24,655 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-22 16:40:24,655 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-12-22 16:40:24,668 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 24 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 16:40:24,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:40:24,734 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 10 treesize of output 8 [2021-12-22 16:40:24,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1868314461] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:40:24,925 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:40:24,925 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 23] total 38 [2021-12-22 16:40:24,925 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101662294] [2021-12-22 16:40:24,925 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:40:24,925 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-12-22 16:40:24,925 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:40:24,925 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-12-22 16:40:24,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1572, Unknown=22, NotChecked=80, Total=1806 [2021-12-22 16:40:24,926 INFO L87 Difference]: Start difference. First operand 334 states and 397 transitions. Second operand has 38 states, 38 states have (on average 2.6578947368421053) internal successors, (101), 35 states have internal predecessors, (101), 6 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6)