./Ultimate.py --spec ../sv-benchmarks/c/properties/valid-memsafety.prp --file ../sv-benchmarks/c/memsafety-ext2/length_test03-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 35987657 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/memsafety-ext2/length_test03-2.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 8d477dcc38abb71f88978d460e8393ef9ba09f24c134f3de362c4df2a3599c9a --- Real Ultimate output --- This is Ultimate 0.2.2-?-3598765 [2022-07-21 17:14:57,127 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-07-21 17:14:57,129 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-07-21 17:14:57,164 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-07-21 17:14:57,165 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-07-21 17:14:57,166 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-07-21 17:14:57,170 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-07-21 17:14:57,174 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-07-21 17:14:57,175 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-07-21 17:14:57,181 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-07-21 17:14:57,182 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-07-21 17:14:57,184 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-07-21 17:14:57,184 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-07-21 17:14:57,187 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-07-21 17:14:57,188 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-07-21 17:14:57,195 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-07-21 17:14:57,195 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-07-21 17:14:57,196 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-07-21 17:14:57,198 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-07-21 17:14:57,200 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-07-21 17:14:57,204 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-07-21 17:14:57,204 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-07-21 17:14:57,206 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-07-21 17:14:57,207 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-07-21 17:14:57,209 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-07-21 17:14:57,216 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-07-21 17:14:57,218 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-07-21 17:14:57,218 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-07-21 17:14:57,219 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-07-21 17:14:57,219 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-07-21 17:14:57,220 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-07-21 17:14:57,220 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-07-21 17:14:57,222 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-07-21 17:14:57,222 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-07-21 17:14:57,224 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-07-21 17:14:57,224 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-07-21 17:14:57,225 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-07-21 17:14:57,225 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-07-21 17:14:57,226 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-07-21 17:14:57,226 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-07-21 17:14:57,226 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-07-21 17:14:57,228 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-07-21 17:14:57,231 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2022-07-21 17:14:57,257 INFO L113 SettingsManager]: Loading preferences was successful [2022-07-21 17:14:57,258 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-07-21 17:14:57,259 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-07-21 17:14:57,259 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-07-21 17:14:57,260 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-07-21 17:14:57,260 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-07-21 17:14:57,260 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-07-21 17:14:57,261 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-07-21 17:14:57,261 INFO L138 SettingsManager]: * Use SBE=true [2022-07-21 17:14:57,262 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-07-21 17:14:57,262 INFO L138 SettingsManager]: * sizeof long=4 [2022-07-21 17:14:57,262 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-07-21 17:14:57,262 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-07-21 17:14:57,263 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-07-21 17:14:57,263 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-07-21 17:14:57,263 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-07-21 17:14:57,263 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-07-21 17:14:57,263 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-07-21 17:14:57,264 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-07-21 17:14:57,264 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-07-21 17:14:57,264 INFO L138 SettingsManager]: * sizeof long double=12 [2022-07-21 17:14:57,264 INFO L138 SettingsManager]: * Use constant arrays=true [2022-07-21 17:14:57,265 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-07-21 17:14:57,265 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-07-21 17:14:57,265 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-07-21 17:14:57,265 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-21 17:14:57,265 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-07-21 17:14:57,266 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-07-21 17:14:57,266 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-07-21 17:14:57,266 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-07-21 17:14:57,266 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8d477dcc38abb71f88978d460e8393ef9ba09f24c134f3de362c4df2a3599c9a [2022-07-21 17:14:57,578 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-07-21 17:14:57,604 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-07-21 17:14:57,606 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-07-21 17:14:57,607 INFO L271 PluginConnector]: Initializing CDTParser... [2022-07-21 17:14:57,607 INFO L275 PluginConnector]: CDTParser initialized [2022-07-21 17:14:57,609 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/memsafety-ext2/length_test03-2.i [2022-07-21 17:14:57,661 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9f0b9088b/15c8aeec763d445dbf9d78da0a3051a5/FLAG0b55a7a06 [2022-07-21 17:14:58,125 INFO L306 CDTParser]: Found 1 translation units. [2022-07-21 17:14:58,126 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/memsafety-ext2/length_test03-2.i [2022-07-21 17:14:58,146 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9f0b9088b/15c8aeec763d445dbf9d78da0a3051a5/FLAG0b55a7a06 [2022-07-21 17:14:58,633 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9f0b9088b/15c8aeec763d445dbf9d78da0a3051a5 [2022-07-21 17:14:58,635 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-07-21 17:14:58,635 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-07-21 17:14:58,636 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-07-21 17:14:58,636 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-07-21 17:14:58,639 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-07-21 17:14:58,640 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 05:14:58" (1/1) ... [2022-07-21 17:14:58,641 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@12cac79 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:14:58, skipping insertion in model container [2022-07-21 17:14:58,641 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 05:14:58" (1/1) ... [2022-07-21 17:14:58,647 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-07-21 17:14:58,677 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-21 17:14:58,918 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-21 17:14:58,928 INFO L203 MainTranslator]: Completed pre-run [2022-07-21 17:14:58,991 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-21 17:14:59,022 INFO L208 MainTranslator]: Completed translation [2022-07-21 17:14:59,022 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:14:59 WrapperNode [2022-07-21 17:14:59,023 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-07-21 17:14:59,024 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-07-21 17:14:59,024 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-07-21 17:14:59,025 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-07-21 17:14:59,030 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:14:59" (1/1) ... [2022-07-21 17:14:59,059 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:14:59" (1/1) ... [2022-07-21 17:14:59,086 INFO L137 Inliner]: procedures = 123, calls = 38, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 97 [2022-07-21 17:14:59,086 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-07-21 17:14:59,087 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-07-21 17:14:59,088 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-07-21 17:14:59,088 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-07-21 17:14:59,094 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:14:59" (1/1) ... [2022-07-21 17:14:59,094 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:14:59" (1/1) ... [2022-07-21 17:14:59,109 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:14:59" (1/1) ... [2022-07-21 17:14:59,110 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:14:59" (1/1) ... [2022-07-21 17:14:59,120 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:14:59" (1/1) ... [2022-07-21 17:14:59,127 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:14:59" (1/1) ... [2022-07-21 17:14:59,132 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:14:59" (1/1) ... [2022-07-21 17:14:59,137 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-07-21 17:14:59,140 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-07-21 17:14:59,140 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-07-21 17:14:59,140 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-07-21 17:14:59,141 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:14:59" (1/1) ... [2022-07-21 17:14:59,147 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-21 17:14:59,156 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:14:59,172 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) [2022-07-21 17:14:59,192 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 [2022-07-21 17:14:59,218 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-07-21 17:14:59,219 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-07-21 17:14:59,220 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-07-21 17:14:59,220 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-07-21 17:14:59,220 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-07-21 17:14:59,220 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-07-21 17:14:59,220 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-07-21 17:14:59,220 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-07-21 17:14:59,220 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-07-21 17:14:59,221 INFO L130 BoogieDeclarations]: Found specification of procedure append [2022-07-21 17:14:59,221 INFO L138 BoogieDeclarations]: Found implementation of procedure append [2022-07-21 17:14:59,378 INFO L234 CfgBuilder]: Building ICFG [2022-07-21 17:14:59,382 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-07-21 17:14:59,728 INFO L275 CfgBuilder]: Performing block encoding [2022-07-21 17:14:59,734 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-07-21 17:14:59,736 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2022-07-21 17:14:59,737 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 05:14:59 BoogieIcfgContainer [2022-07-21 17:14:59,738 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-07-21 17:14:59,740 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-07-21 17:14:59,740 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-07-21 17:14:59,743 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-07-21 17:14:59,743 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 05:14:58" (1/3) ... [2022-07-21 17:14:59,744 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@232b7c0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 05:14:59, skipping insertion in model container [2022-07-21 17:14:59,744 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:14:59" (2/3) ... [2022-07-21 17:14:59,744 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@232b7c0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 05:14:59, skipping insertion in model container [2022-07-21 17:14:59,745 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 05:14:59" (3/3) ... [2022-07-21 17:14:59,746 INFO L111 eAbstractionObserver]: Analyzing ICFG length_test03-2.i [2022-07-21 17:14:59,758 INFO L201 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-07-21 17:14:59,758 INFO L160 ceAbstractionStarter]: Applying trace abstraction to program that has 59 error locations. [2022-07-21 17:14:59,811 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-21 17:14:59,820 INFO L357 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, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@2f5d261b, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@55693fa1 [2022-07-21 17:14:59,821 INFO L358 AbstractCegarLoop]: Starting to check reachability of 59 error locations. [2022-07-21 17:14:59,825 INFO L276 IsEmpty]: Start isEmpty. Operand has 128 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 124 states have internal predecessors, (134), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 17:14:59,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-07-21 17:14:59,834 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:14:59,834 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-07-21 17:14:59,835 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:14:59,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:14:59,840 INFO L85 PathProgramCache]: Analyzing trace with hash 29857, now seen corresponding path program 1 times [2022-07-21 17:14:59,847 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:14:59,848 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [699692985] [2022-07-21 17:14:59,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:14:59,849 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:14:59,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:14:59,988 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:14:59,988 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:14:59,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [699692985] [2022-07-21 17:14:59,989 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [699692985] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:14:59,990 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:14:59,990 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-21 17:14:59,993 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665710908] [2022-07-21 17:14:59,994 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:14:59,999 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-21 17:15:00,000 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:15:00,030 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-21 17:15:00,031 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-21 17:15:00,034 INFO L87 Difference]: Start difference. First operand has 128 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 124 states have internal predecessors, (134), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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) [2022-07-21 17:15:00,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:00,220 INFO L93 Difference]: Finished difference Result 165 states and 174 transitions. [2022-07-21 17:15:00,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-21 17:15:00,225 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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 3 [2022-07-21 17:15:00,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:00,232 INFO L225 Difference]: With dead ends: 165 [2022-07-21 17:15:00,232 INFO L226 Difference]: Without dead ends: 163 [2022-07-21 17:15:00,234 INFO L412 NwaCegarLoop]: 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 [2022-07-21 17:15:00,237 INFO L413 NwaCegarLoop]: 108 mSDtfsCounter, 53 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:00,237 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 170 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-21 17:15:00,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2022-07-21 17:15:00,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 124. [2022-07-21 17:15:00,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 64 states have (on average 1.96875) internal successors, (126), 120 states have internal predecessors, (126), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 17:15:00,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 130 transitions. [2022-07-21 17:15:00,278 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 130 transitions. Word has length 3 [2022-07-21 17:15:00,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:00,278 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 130 transitions. [2022-07-21 17:15:00,278 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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) [2022-07-21 17:15:00,278 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 130 transitions. [2022-07-21 17:15:00,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-07-21 17:15:00,279 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:00,279 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-07-21 17:15:00,279 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-07-21 17:15:00,280 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:00,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:00,280 INFO L85 PathProgramCache]: Analyzing trace with hash 29858, now seen corresponding path program 1 times [2022-07-21 17:15:00,281 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:15:00,281 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1635435419] [2022-07-21 17:15:00,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:00,281 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:15:00,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:00,313 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:00,314 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:15:00,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1635435419] [2022-07-21 17:15:00,314 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1635435419] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:00,315 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:15:00,315 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-21 17:15:00,315 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613557243] [2022-07-21 17:15:00,315 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:00,316 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-21 17:15:00,316 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:15:00,317 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-21 17:15:00,317 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-21 17:15:00,317 INFO L87 Difference]: Start difference. First operand 124 states and 130 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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) [2022-07-21 17:15:00,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:00,391 INFO L93 Difference]: Finished difference Result 124 states and 131 transitions. [2022-07-21 17:15:00,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-21 17:15:00,392 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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 3 [2022-07-21 17:15:00,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:00,393 INFO L225 Difference]: With dead ends: 124 [2022-07-21 17:15:00,394 INFO L226 Difference]: Without dead ends: 124 [2022-07-21 17:15:00,394 INFO L412 NwaCegarLoop]: 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 [2022-07-21 17:15:00,395 INFO L413 NwaCegarLoop]: 122 mSDtfsCounter, 10 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:00,396 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 191 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-21 17:15:00,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-07-21 17:15:00,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 122. [2022-07-21 17:15:00,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 64 states have (on average 1.9375) internal successors, (124), 118 states have internal predecessors, (124), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 17:15:00,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 128 transitions. [2022-07-21 17:15:00,423 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 128 transitions. Word has length 3 [2022-07-21 17:15:00,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:00,423 INFO L495 AbstractCegarLoop]: Abstraction has 122 states and 128 transitions. [2022-07-21 17:15:00,424 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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) [2022-07-21 17:15:00,424 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 128 transitions. [2022-07-21 17:15:00,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-07-21 17:15:00,424 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:00,424 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-07-21 17:15:00,425 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-07-21 17:15:00,425 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:00,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:00,426 INFO L85 PathProgramCache]: Analyzing trace with hash 889446152, now seen corresponding path program 1 times [2022-07-21 17:15:00,426 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:15:00,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [530814584] [2022-07-21 17:15:00,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:00,434 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:15:00,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:00,528 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:00,529 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:15:00,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [530814584] [2022-07-21 17:15:00,529 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [530814584] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:00,529 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:15:00,529 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-21 17:15:00,530 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184575557] [2022-07-21 17:15:00,530 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:00,530 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-21 17:15:00,530 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:15:00,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-21 17:15:00,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-21 17:15:00,531 INFO L87 Difference]: Start difference. First operand 122 states and 128 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2022-07-21 17:15:00,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:00,664 INFO L93 Difference]: Finished difference Result 139 states and 147 transitions. [2022-07-21 17:15:00,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-21 17:15:00,665 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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 6 [2022-07-21 17:15:00,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:00,670 INFO L225 Difference]: With dead ends: 139 [2022-07-21 17:15:00,671 INFO L226 Difference]: Without dead ends: 139 [2022-07-21 17:15:00,672 INFO L412 NwaCegarLoop]: 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 [2022-07-21 17:15:00,678 INFO L413 NwaCegarLoop]: 114 mSDtfsCounter, 27 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:00,680 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 174 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-21 17:15:00,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2022-07-21 17:15:00,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 125. [2022-07-21 17:15:00,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 69 states have (on average 1.8840579710144927) internal successors, (130), 121 states have internal predecessors, (130), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 17:15:00,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 134 transitions. [2022-07-21 17:15:00,703 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 134 transitions. Word has length 6 [2022-07-21 17:15:00,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:00,703 INFO L495 AbstractCegarLoop]: Abstraction has 125 states and 134 transitions. [2022-07-21 17:15:00,704 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2022-07-21 17:15:00,704 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 134 transitions. [2022-07-21 17:15:00,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-07-21 17:15:00,704 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:00,705 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-07-21 17:15:00,705 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-07-21 17:15:00,705 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:00,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:00,706 INFO L85 PathProgramCache]: Analyzing trace with hash 889446153, now seen corresponding path program 1 times [2022-07-21 17:15:00,706 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:15:00,707 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1302719652] [2022-07-21 17:15:00,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:00,707 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:15:00,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:00,779 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:00,779 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:15:00,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1302719652] [2022-07-21 17:15:00,780 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1302719652] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:00,781 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:15:00,781 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-21 17:15:00,781 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991179413] [2022-07-21 17:15:00,781 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:00,782 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-21 17:15:00,782 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:15:00,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-21 17:15:00,783 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-21 17:15:00,784 INFO L87 Difference]: Start difference. First operand 125 states and 134 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2022-07-21 17:15:00,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:00,870 INFO L93 Difference]: Finished difference Result 125 states and 135 transitions. [2022-07-21 17:15:00,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-21 17:15:00,871 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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 6 [2022-07-21 17:15:00,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:00,872 INFO L225 Difference]: With dead ends: 125 [2022-07-21 17:15:00,872 INFO L226 Difference]: Without dead ends: 125 [2022-07-21 17:15:00,872 INFO L412 NwaCegarLoop]: 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 [2022-07-21 17:15:00,881 INFO L413 NwaCegarLoop]: 123 mSDtfsCounter, 4 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:00,883 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 191 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-21 17:15:00,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2022-07-21 17:15:00,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 123. [2022-07-21 17:15:00,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 69 states have (on average 1.855072463768116) internal successors, (128), 119 states have internal predecessors, (128), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 17:15:00,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 132 transitions. [2022-07-21 17:15:00,898 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 132 transitions. Word has length 6 [2022-07-21 17:15:00,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:00,899 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 132 transitions. [2022-07-21 17:15:00,899 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2022-07-21 17:15:00,899 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 132 transitions. [2022-07-21 17:15:00,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-07-21 17:15:00,900 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:00,900 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:00,900 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-07-21 17:15:00,901 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting appendErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:00,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:00,902 INFO L85 PathProgramCache]: Analyzing trace with hash 1036550317, now seen corresponding path program 1 times [2022-07-21 17:15:00,902 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:15:00,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1450639783] [2022-07-21 17:15:00,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:00,903 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:15:00,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:01,018 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:01,019 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:15:01,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1450639783] [2022-07-21 17:15:01,019 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1450639783] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:01,019 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:15:01,019 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-21 17:15:01,020 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263782789] [2022-07-21 17:15:01,020 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:01,020 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-21 17:15:01,021 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:15:01,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-21 17:15:01,022 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-21 17:15:01,023 INFO L87 Difference]: Start difference. First operand 123 states and 132 transitions. Second operand has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:15:01,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:01,081 INFO L93 Difference]: Finished difference Result 118 states and 127 transitions. [2022-07-21 17:15:01,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-21 17:15:01,082 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-07-21 17:15:01,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:01,083 INFO L225 Difference]: With dead ends: 118 [2022-07-21 17:15:01,083 INFO L226 Difference]: Without dead ends: 118 [2022-07-21 17:15:01,083 INFO L412 NwaCegarLoop]: 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 [2022-07-21 17:15:01,084 INFO L413 NwaCegarLoop]: 93 mSDtfsCounter, 43 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:01,084 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 147 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-21 17:15:01,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2022-07-21 17:15:01,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2022-07-21 17:15:01,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 69 states have (on average 1.7826086956521738) internal successors, (123), 114 states have internal predecessors, (123), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 17:15:01,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 127 transitions. [2022-07-21 17:15:01,092 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 127 transitions. Word has length 12 [2022-07-21 17:15:01,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:01,092 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 127 transitions. [2022-07-21 17:15:01,092 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:15:01,092 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 127 transitions. [2022-07-21 17:15:01,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-07-21 17:15:01,093 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:01,093 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:01,093 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-07-21 17:15:01,094 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting appendErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:01,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:01,094 INFO L85 PathProgramCache]: Analyzing trace with hash 1036550316, now seen corresponding path program 1 times [2022-07-21 17:15:01,094 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:15:01,095 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [340897566] [2022-07-21 17:15:01,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:01,095 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:15:01,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:01,134 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:01,134 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:15:01,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [340897566] [2022-07-21 17:15:01,135 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [340897566] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:01,135 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:15:01,135 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-21 17:15:01,135 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [999876117] [2022-07-21 17:15:01,136 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:01,136 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-21 17:15:01,136 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:15:01,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-21 17:15:01,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-21 17:15:01,137 INFO L87 Difference]: Start difference. First operand 118 states and 127 transitions. Second operand has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:15:01,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:01,191 INFO L93 Difference]: Finished difference Result 113 states and 122 transitions. [2022-07-21 17:15:01,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-21 17:15:01,192 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-07-21 17:15:01,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:01,193 INFO L225 Difference]: With dead ends: 113 [2022-07-21 17:15:01,193 INFO L226 Difference]: Without dead ends: 113 [2022-07-21 17:15:01,193 INFO L412 NwaCegarLoop]: 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 [2022-07-21 17:15:01,194 INFO L413 NwaCegarLoop]: 93 mSDtfsCounter, 38 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:01,194 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 138 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-21 17:15:01,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-07-21 17:15:01,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2022-07-21 17:15:01,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 69 states have (on average 1.710144927536232) internal successors, (118), 109 states have internal predecessors, (118), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 17:15:01,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 122 transitions. [2022-07-21 17:15:01,199 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 122 transitions. Word has length 12 [2022-07-21 17:15:01,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:01,199 INFO L495 AbstractCegarLoop]: Abstraction has 113 states and 122 transitions. [2022-07-21 17:15:01,200 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:15:01,200 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 122 transitions. [2022-07-21 17:15:01,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-07-21 17:15:01,200 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:01,200 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:01,201 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-07-21 17:15:01,201 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:01,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:01,201 INFO L85 PathProgramCache]: Analyzing trace with hash 2068288823, now seen corresponding path program 1 times [2022-07-21 17:15:01,202 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:15:01,202 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [980375816] [2022-07-21 17:15:01,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:01,202 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:15:01,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:01,296 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:01,296 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:15:01,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [980375816] [2022-07-21 17:15:01,297 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [980375816] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:01,297 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:15:01,297 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-07-21 17:15:01,297 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [301862485] [2022-07-21 17:15:01,298 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:01,298 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-07-21 17:15:01,298 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:15:01,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-07-21 17:15:01,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-07-21 17:15:01,299 INFO L87 Difference]: Start difference. First operand 113 states and 122 transitions. Second operand has 7 states, 6 states have (on average 2.0) internal successors, (12), 6 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) [2022-07-21 17:15:01,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:01,513 INFO L93 Difference]: Finished difference Result 223 states and 240 transitions. [2022-07-21 17:15:01,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-07-21 17:15:01,514 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.0) internal successors, (12), 6 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 [2022-07-21 17:15:01,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:01,515 INFO L225 Difference]: With dead ends: 223 [2022-07-21 17:15:01,515 INFO L226 Difference]: Without dead ends: 223 [2022-07-21 17:15:01,515 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2022-07-21 17:15:01,516 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 296 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 222 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 296 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 222 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:01,516 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [296 Valid, 209 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 222 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-21 17:15:01,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2022-07-21 17:15:01,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 147. [2022-07-21 17:15:01,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 108 states have (on average 1.6296296296296295) internal successors, (176), 142 states have internal predecessors, (176), 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) [2022-07-21 17:15:01,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 180 transitions. [2022-07-21 17:15:01,522 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 180 transitions. Word has length 13 [2022-07-21 17:15:01,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:01,522 INFO L495 AbstractCegarLoop]: Abstraction has 147 states and 180 transitions. [2022-07-21 17:15:01,522 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.0) internal successors, (12), 6 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) [2022-07-21 17:15:01,523 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 180 transitions. [2022-07-21 17:15:01,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-07-21 17:15:01,523 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:01,523 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:01,524 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-07-21 17:15:01,524 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting appendErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:01,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:01,524 INFO L85 PathProgramCache]: Analyzing trace with hash 2068288824, now seen corresponding path program 1 times [2022-07-21 17:15:01,525 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:15:01,525 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1539954046] [2022-07-21 17:15:01,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:01,525 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:15:01,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:01,631 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:01,631 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:15:01,632 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1539954046] [2022-07-21 17:15:01,632 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1539954046] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:01,632 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:15:01,632 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-07-21 17:15:01,632 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831376615] [2022-07-21 17:15:01,633 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:01,633 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-07-21 17:15:01,633 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:15:01,634 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-07-21 17:15:01,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-07-21 17:15:01,634 INFO L87 Difference]: Start difference. First operand 147 states and 180 transitions. Second operand has 7 states, 6 states have (on average 2.0) internal successors, (12), 6 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) [2022-07-21 17:15:01,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:01,776 INFO L93 Difference]: Finished difference Result 173 states and 208 transitions. [2022-07-21 17:15:01,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-07-21 17:15:01,777 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.0) internal successors, (12), 6 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 [2022-07-21 17:15:01,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:01,778 INFO L225 Difference]: With dead ends: 173 [2022-07-21 17:15:01,778 INFO L226 Difference]: Without dead ends: 173 [2022-07-21 17:15:01,778 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2022-07-21 17:15:01,778 INFO L413 NwaCegarLoop]: 89 mSDtfsCounter, 33 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:01,779 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 277 Invalid, 164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 155 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-21 17:15:01,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2022-07-21 17:15:01,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 171. [2022-07-21 17:15:01,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 130 states have (on average 1.5538461538461539) internal successors, (202), 165 states have internal predecessors, (202), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-07-21 17:15:01,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 208 transitions. [2022-07-21 17:15:01,784 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 208 transitions. Word has length 13 [2022-07-21 17:15:01,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:01,784 INFO L495 AbstractCegarLoop]: Abstraction has 171 states and 208 transitions. [2022-07-21 17:15:01,784 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.0) internal successors, (12), 6 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) [2022-07-21 17:15:01,784 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 208 transitions. [2022-07-21 17:15:01,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-07-21 17:15:01,785 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:01,785 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:01,785 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-07-21 17:15:01,785 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting appendErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:01,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:01,786 INFO L85 PathProgramCache]: Analyzing trace with hash -203399961, now seen corresponding path program 1 times [2022-07-21 17:15:01,786 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:15:01,786 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1988009792] [2022-07-21 17:15:01,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:01,786 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:15:01,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:02,007 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:02,007 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:15:02,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1988009792] [2022-07-21 17:15:02,008 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1988009792] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:02,008 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:15:02,008 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-07-21 17:15:02,008 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [110135023] [2022-07-21 17:15:02,008 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:02,009 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-07-21 17:15:02,009 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:15:02,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-07-21 17:15:02,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2022-07-21 17:15:02,010 INFO L87 Difference]: Start difference. First operand 171 states and 208 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 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) [2022-07-21 17:15:02,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:02,215 INFO L93 Difference]: Finished difference Result 173 states and 207 transitions. [2022-07-21 17:15:02,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-07-21 17:15:02,216 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 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 22 [2022-07-21 17:15:02,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:02,218 INFO L225 Difference]: With dead ends: 173 [2022-07-21 17:15:02,218 INFO L226 Difference]: Without dead ends: 173 [2022-07-21 17:15:02,218 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2022-07-21 17:15:02,218 INFO L413 NwaCegarLoop]: 93 mSDtfsCounter, 34 mSDsluCounter, 421 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 514 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:02,219 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 514 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 236 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-21 17:15:02,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2022-07-21 17:15:02,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 171. [2022-07-21 17:15:02,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 130 states have (on average 1.5461538461538462) internal successors, (201), 165 states have internal predecessors, (201), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-07-21 17:15:02,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 207 transitions. [2022-07-21 17:15:02,222 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 207 transitions. Word has length 22 [2022-07-21 17:15:02,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:02,222 INFO L495 AbstractCegarLoop]: Abstraction has 171 states and 207 transitions. [2022-07-21 17:15:02,222 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 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) [2022-07-21 17:15:02,223 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 207 transitions. [2022-07-21 17:15:02,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-07-21 17:15:02,223 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:02,223 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:02,223 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-07-21 17:15:02,223 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting appendErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:02,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:02,224 INFO L85 PathProgramCache]: Analyzing trace with hash 167434122, now seen corresponding path program 1 times [2022-07-21 17:15:02,224 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:15:02,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [472415328] [2022-07-21 17:15:02,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:02,224 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:15:02,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:02,439 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:02,440 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:15:02,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [472415328] [2022-07-21 17:15:02,440 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [472415328] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:02,441 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:15:02,441 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-07-21 17:15:02,441 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [985876331] [2022-07-21 17:15:02,441 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:02,442 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-21 17:15:02,442 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:15:02,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-21 17:15:02,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-07-21 17:15:02,443 INFO L87 Difference]: Start difference. First operand 171 states and 207 transitions. Second operand has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:15:02,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:02,675 INFO L93 Difference]: Finished difference Result 163 states and 196 transitions. [2022-07-21 17:15:02,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-07-21 17:15:02,676 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-07-21 17:15:02,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:02,677 INFO L225 Difference]: With dead ends: 163 [2022-07-21 17:15:02,677 INFO L226 Difference]: Without dead ends: 163 [2022-07-21 17:15:02,677 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2022-07-21 17:15:02,678 INFO L413 NwaCegarLoop]: 96 mSDtfsCounter, 10 mSDsluCounter, 486 mSDsCounter, 0 mSdLazyCounter, 279 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 582 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:02,678 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 582 Invalid, 291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 279 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-21 17:15:02,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2022-07-21 17:15:02,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 163. [2022-07-21 17:15:02,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 122 states have (on average 1.5573770491803278) internal successors, (190), 157 states have internal predecessors, (190), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-07-21 17:15:02,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 196 transitions. [2022-07-21 17:15:02,682 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 196 transitions. Word has length 24 [2022-07-21 17:15:02,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:02,682 INFO L495 AbstractCegarLoop]: Abstraction has 163 states and 196 transitions. [2022-07-21 17:15:02,682 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:15:02,682 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 196 transitions. [2022-07-21 17:15:02,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-07-21 17:15:02,683 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:02,683 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:02,683 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-07-21 17:15:02,683 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:02,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:02,684 INFO L85 PathProgramCache]: Analyzing trace with hash -1239284085, now seen corresponding path program 1 times [2022-07-21 17:15:02,684 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:15:02,684 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [472513586] [2022-07-21 17:15:02,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:02,684 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:15:02,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:02,747 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-07-21 17:15:02,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:02,760 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:02,760 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:15:02,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [472513586] [2022-07-21 17:15:02,760 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [472513586] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:02,760 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:15:02,761 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-07-21 17:15:02,761 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971574399] [2022-07-21 17:15:02,761 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:02,761 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-07-21 17:15:02,761 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:15:02,762 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-07-21 17:15:02,762 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-07-21 17:15:02,762 INFO L87 Difference]: Start difference. First operand 163 states and 196 transitions. Second operand has 4 states, 4 states have (on average 6.75) internal successors, (27), 3 states have internal predecessors, (27), 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) [2022-07-21 17:15:02,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:02,843 INFO L93 Difference]: Finished difference Result 155 states and 172 transitions. [2022-07-21 17:15:02,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-07-21 17:15:02,844 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 3 states have internal predecessors, (27), 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 29 [2022-07-21 17:15:02,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:02,846 INFO L225 Difference]: With dead ends: 155 [2022-07-21 17:15:02,846 INFO L226 Difference]: Without dead ends: 155 [2022-07-21 17:15:02,846 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-07-21 17:15:02,848 INFO L413 NwaCegarLoop]: 104 mSDtfsCounter, 12 mSDsluCounter, 143 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 247 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:02,849 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 247 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-21 17:15:02,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2022-07-21 17:15:02,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 142. [2022-07-21 17:15:02,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 101 states have (on average 1.504950495049505) internal successors, (152), 136 states have internal predecessors, (152), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-07-21 17:15:02,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 158 transitions. [2022-07-21 17:15:02,852 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 158 transitions. Word has length 29 [2022-07-21 17:15:02,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:02,852 INFO L495 AbstractCegarLoop]: Abstraction has 142 states and 158 transitions. [2022-07-21 17:15:02,853 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 3 states have internal predecessors, (27), 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) [2022-07-21 17:15:02,853 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 158 transitions. [2022-07-21 17:15:02,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-07-21 17:15:02,854 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:02,854 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:02,854 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-07-21 17:15:02,854 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting appendErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:02,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:02,855 INFO L85 PathProgramCache]: Analyzing trace with hash -1195581248, now seen corresponding path program 1 times [2022-07-21 17:15:02,855 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:15:02,855 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [162434269] [2022-07-21 17:15:02,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:02,855 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:15:02,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:02,951 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-07-21 17:15:02,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:03,079 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:03,079 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:15:03,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [162434269] [2022-07-21 17:15:03,079 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [162434269] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:15:03,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1252932853] [2022-07-21 17:15:03,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:03,080 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:15:03,080 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:15:03,082 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) [2022-07-21 17:15:03,083 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-07-21 17:15:03,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:03,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 26 conjunts are in the unsatisfiable core [2022-07-21 17:15:03,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:03,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 17:15:03,526 INFO L390 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 [2022-07-21 17:15:03,535 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-21 17:15:03,535 INFO L390 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 [2022-07-21 17:15:03,543 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:03,543 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:15:03,777 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-21 17:15:03,779 INFO L390 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 17 treesize of output 13 [2022-07-21 17:15:03,883 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 17:15:03,883 INFO L390 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 26 treesize of output 30 [2022-07-21 17:15:04,012 INFO L356 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-07-21 17:15:04,012 INFO L390 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 13 treesize of output 12 [2022-07-21 17:15:04,047 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:04,048 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1252932853] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 17:15:04,048 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-21 17:15:04,048 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8, 8] total 23 [2022-07-21 17:15:04,048 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [277243509] [2022-07-21 17:15:04,048 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-21 17:15:04,049 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-07-21 17:15:04,049 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:15:04,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-07-21 17:15:04,050 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=471, Unknown=0, NotChecked=0, Total=552 [2022-07-21 17:15:04,050 INFO L87 Difference]: Start difference. First operand 142 states and 158 transitions. Second operand has 24 states, 23 states have (on average 3.1739130434782608) internal successors, (73), 20 states have internal predecessors, (73), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-07-21 17:15:04,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:04,452 INFO L93 Difference]: Finished difference Result 179 states and 189 transitions. [2022-07-21 17:15:04,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-07-21 17:15:04,453 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 3.1739130434782608) internal successors, (73), 20 states have internal predecessors, (73), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 31 [2022-07-21 17:15:04,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:04,454 INFO L225 Difference]: With dead ends: 179 [2022-07-21 17:15:04,454 INFO L226 Difference]: Without dead ends: 179 [2022-07-21 17:15:04,454 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=131, Invalid=625, Unknown=0, NotChecked=0, Total=756 [2022-07-21 17:15:04,455 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 494 mSDsluCounter, 491 mSDsCounter, 0 mSdLazyCounter, 472 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 495 SdHoareTripleChecker+Valid, 550 SdHoareTripleChecker+Invalid, 725 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 472 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 216 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:04,455 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [495 Valid, 550 Invalid, 725 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 472 Invalid, 0 Unknown, 216 Unchecked, 0.3s Time] [2022-07-21 17:15:04,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2022-07-21 17:15:04,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 140. [2022-07-21 17:15:04,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 101 states have (on average 1.4158415841584158) internal successors, (143), 134 states have internal predecessors, (143), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-07-21 17:15:04,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 149 transitions. [2022-07-21 17:15:04,459 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 149 transitions. Word has length 31 [2022-07-21 17:15:04,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:04,459 INFO L495 AbstractCegarLoop]: Abstraction has 140 states and 149 transitions. [2022-07-21 17:15:04,459 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 3.1739130434782608) internal successors, (73), 20 states have internal predecessors, (73), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-07-21 17:15:04,459 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 149 transitions. [2022-07-21 17:15:04,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-07-21 17:15:04,460 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:04,460 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:04,489 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-07-21 17:15:04,661 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-07-21 17:15:04,661 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:04,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:04,662 INFO L85 PathProgramCache]: Analyzing trace with hash 32633587, now seen corresponding path program 1 times [2022-07-21 17:15:04,662 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:15:04,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2054361111] [2022-07-21 17:15:04,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:04,662 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:15:04,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:04,768 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-07-21 17:15:04,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:04,835 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:04,836 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:15:04,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2054361111] [2022-07-21 17:15:04,836 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2054361111] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:15:04,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1753362970] [2022-07-21 17:15:04,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:04,837 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:15:04,837 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:15:04,838 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) [2022-07-21 17:15:04,848 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-07-21 17:15:04,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:04,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 18 conjunts are in the unsatisfiable core [2022-07-21 17:15:04,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:04,972 INFO L390 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 [2022-07-21 17:15:05,086 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-07-21 17:15:05,086 INFO L390 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 17 treesize of output 21 [2022-07-21 17:15:05,104 INFO L356 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2022-07-21 17:15:05,104 INFO L390 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 14 [2022-07-21 17:15:05,112 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:05,113 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:15:05,164 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1753362970] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:15:05,164 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 17:15:05,164 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 10 [2022-07-21 17:15:05,164 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1843099966] [2022-07-21 17:15:05,165 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 17:15:05,165 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-07-21 17:15:05,165 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:15:05,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-07-21 17:15:05,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2022-07-21 17:15:05,166 INFO L87 Difference]: Start difference. First operand 140 states and 149 transitions. Second operand has 11 states, 10 states have (on average 4.6) internal successors, (46), 8 states have internal predecessors, (46), 1 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-07-21 17:15:05,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:05,372 INFO L93 Difference]: Finished difference Result 164 states and 172 transitions. [2022-07-21 17:15:05,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-07-21 17:15:05,373 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 4.6) internal successors, (46), 8 states have internal predecessors, (46), 1 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 32 [2022-07-21 17:15:05,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:05,374 INFO L225 Difference]: With dead ends: 164 [2022-07-21 17:15:05,374 INFO L226 Difference]: Without dead ends: 164 [2022-07-21 17:15:05,374 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 38 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2022-07-21 17:15:05,375 INFO L413 NwaCegarLoop]: 74 mSDtfsCounter, 145 mSDsluCounter, 348 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 422 SdHoareTripleChecker+Invalid, 379 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 54 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:05,375 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [145 Valid, 422 Invalid, 379 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 319 Invalid, 0 Unknown, 54 Unchecked, 0.2s Time] [2022-07-21 17:15:05,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2022-07-21 17:15:05,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 141. [2022-07-21 17:15:05,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 103 states have (on average 1.4174757281553398) internal successors, (146), 135 states have internal predecessors, (146), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-07-21 17:15:05,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2022-07-21 17:15:05,379 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 32 [2022-07-21 17:15:05,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:05,379 INFO L495 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2022-07-21 17:15:05,379 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 4.6) internal successors, (46), 8 states have internal predecessors, (46), 1 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-07-21 17:15:05,379 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2022-07-21 17:15:05,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-07-21 17:15:05,380 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:05,380 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:05,405 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-07-21 17:15:05,591 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-07-21 17:15:05,591 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting appendErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:05,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:05,592 INFO L85 PathProgramCache]: Analyzing trace with hash 32633588, now seen corresponding path program 1 times [2022-07-21 17:15:05,592 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:15:05,592 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1572715780] [2022-07-21 17:15:05,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:05,592 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:15:05,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:05,691 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-07-21 17:15:05,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:05,761 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:05,761 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:15:05,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1572715780] [2022-07-21 17:15:05,761 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1572715780] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:15:05,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [650928487] [2022-07-21 17:15:05,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:05,762 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:15:05,762 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:15:05,763 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) [2022-07-21 17:15:05,764 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-07-21 17:15:05,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:05,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 29 conjunts are in the unsatisfiable core [2022-07-21 17:15:05,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:05,900 INFO L390 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 [2022-07-21 17:15:06,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 17:15:06,061 INFO L390 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 [2022-07-21 17:15:06,073 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-07-21 17:15:06,073 INFO L390 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 17 treesize of output 21 [2022-07-21 17:15:06,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 17:15:06,119 INFO L390 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 [2022-07-21 17:15:06,125 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-21 17:15:06,126 INFO L390 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 [2022-07-21 17:15:06,142 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:06,142 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:15:06,383 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [650928487] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:15:06,383 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 17:15:06,383 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 15 [2022-07-21 17:15:06,383 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182458032] [2022-07-21 17:15:06,383 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 17:15:06,384 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-07-21 17:15:06,384 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:15:06,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-07-21 17:15:06,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2022-07-21 17:15:06,385 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand has 16 states, 15 states have (on average 3.7333333333333334) internal successors, (56), 12 states have internal predecessors, (56), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 17:15:06,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:06,716 INFO L93 Difference]: Finished difference Result 182 states and 197 transitions. [2022-07-21 17:15:06,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-07-21 17:15:06,716 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 3.7333333333333334) internal successors, (56), 12 states have internal predecessors, (56), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 32 [2022-07-21 17:15:06,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:06,717 INFO L225 Difference]: With dead ends: 182 [2022-07-21 17:15:06,718 INFO L226 Difference]: Without dead ends: 182 [2022-07-21 17:15:06,718 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=93, Invalid=459, Unknown=0, NotChecked=0, Total=552 [2022-07-21 17:15:06,718 INFO L413 NwaCegarLoop]: 74 mSDtfsCounter, 62 mSDsluCounter, 409 mSDsCounter, 0 mSdLazyCounter, 346 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 483 SdHoareTripleChecker+Invalid, 391 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 346 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 30 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:06,719 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 483 Invalid, 391 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 346 Invalid, 0 Unknown, 30 Unchecked, 0.2s Time] [2022-07-21 17:15:06,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2022-07-21 17:15:06,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 153. [2022-07-21 17:15:06,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 112 states have (on average 1.3928571428571428) internal successors, (156), 145 states have internal predecessors, (156), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (7), 3 states have call predecessors, (7), 5 states have call successors, (7) [2022-07-21 17:15:06,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 168 transitions. [2022-07-21 17:15:06,723 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 168 transitions. Word has length 32 [2022-07-21 17:15:06,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:06,724 INFO L495 AbstractCegarLoop]: Abstraction has 153 states and 168 transitions. [2022-07-21 17:15:06,724 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 3.7333333333333334) internal successors, (56), 12 states have internal predecessors, (56), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 17:15:06,724 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 168 transitions. [2022-07-21 17:15:06,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-07-21 17:15:06,725 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:06,725 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:06,752 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-07-21 17:15:06,940 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:15:06,941 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting appendErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:06,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:06,941 INFO L85 PathProgramCache]: Analyzing trace with hash 1524682805, now seen corresponding path program 1 times [2022-07-21 17:15:06,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:15:06,941 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1367137532] [2022-07-21 17:15:06,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:06,942 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:15:06,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:07,042 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-07-21 17:15:07,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:07,104 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:07,104 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:15:07,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1367137532] [2022-07-21 17:15:07,105 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1367137532] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:15:07,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [148776481] [2022-07-21 17:15:07,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:07,105 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:15:07,105 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:15:07,107 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 17:15:07,134 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-07-21 17:15:07,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:07,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 29 conjunts are in the unsatisfiable core [2022-07-21 17:15:07,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:07,282 INFO L390 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 [2022-07-21 17:15:07,286 INFO L390 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 [2022-07-21 17:15:07,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 17:15:07,435 INFO L390 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 [2022-07-21 17:15:07,446 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-07-21 17:15:07,447 INFO L390 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 17 treesize of output 21 [2022-07-21 17:15:07,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 17:15:07,498 INFO L390 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 [2022-07-21 17:15:07,504 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-21 17:15:07,505 INFO L390 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 [2022-07-21 17:15:07,538 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:07,539 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:15:07,776 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [148776481] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:15:07,777 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 17:15:07,777 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 15 [2022-07-21 17:15:07,777 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376809684] [2022-07-21 17:15:07,777 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 17:15:07,778 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-07-21 17:15:07,778 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:15:07,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-07-21 17:15:07,778 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2022-07-21 17:15:07,779 INFO L87 Difference]: Start difference. First operand 153 states and 168 transitions. Second operand has 16 states, 15 states have (on average 3.933333333333333) internal successors, (59), 12 states have internal predecessors, (59), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 17:15:08,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:08,208 INFO L93 Difference]: Finished difference Result 213 states and 237 transitions. [2022-07-21 17:15:08,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-07-21 17:15:08,208 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 3.933333333333333) internal successors, (59), 12 states have internal predecessors, (59), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 35 [2022-07-21 17:15:08,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:08,210 INFO L225 Difference]: With dead ends: 213 [2022-07-21 17:15:08,210 INFO L226 Difference]: Without dead ends: 213 [2022-07-21 17:15:08,210 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=136, Invalid=676, Unknown=0, NotChecked=0, Total=812 [2022-07-21 17:15:08,211 INFO L413 NwaCegarLoop]: 79 mSDtfsCounter, 62 mSDsluCounter, 586 mSDsCounter, 0 mSdLazyCounter, 425 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 665 SdHoareTripleChecker+Invalid, 513 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 425 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 74 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:08,211 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 665 Invalid, 513 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 425 Invalid, 0 Unknown, 74 Unchecked, 0.2s Time] [2022-07-21 17:15:08,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2022-07-21 17:15:08,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 170. [2022-07-21 17:15:08,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 128 states have (on average 1.3671875) internal successors, (175), 161 states have internal predecessors, (175), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (7), 3 states have call predecessors, (7), 5 states have call successors, (7) [2022-07-21 17:15:08,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 187 transitions. [2022-07-21 17:15:08,216 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 187 transitions. Word has length 35 [2022-07-21 17:15:08,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:08,217 INFO L495 AbstractCegarLoop]: Abstraction has 170 states and 187 transitions. [2022-07-21 17:15:08,217 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 3.933333333333333) internal successors, (59), 12 states have internal predecessors, (59), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 17:15:08,217 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 187 transitions. [2022-07-21 17:15:08,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-07-21 17:15:08,218 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:08,218 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:08,246 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-07-21 17:15:08,431 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-07-21 17:15:08,431 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting appendErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:08,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:08,432 INFO L85 PathProgramCache]: Analyzing trace with hash 20533246, now seen corresponding path program 1 times [2022-07-21 17:15:08,432 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:15:08,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1562583533] [2022-07-21 17:15:08,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:08,432 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:15:08,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:08,561 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-07-21 17:15:08,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:08,615 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:08,615 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:15:08,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1562583533] [2022-07-21 17:15:08,616 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1562583533] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:15:08,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1355371676] [2022-07-21 17:15:08,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:08,616 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:15:08,616 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:15:08,617 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 17:15:08,619 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-07-21 17:15:08,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:08,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 27 conjunts are in the unsatisfiable core [2022-07-21 17:15:08,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:08,787 INFO L390 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 [2022-07-21 17:15:08,939 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 17:15:08,940 INFO L390 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 [2022-07-21 17:15:08,952 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-07-21 17:15:08,953 INFO L390 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 17 treesize of output 21 [2022-07-21 17:15:08,989 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 17:15:08,990 INFO L390 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 [2022-07-21 17:15:08,996 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-21 17:15:08,996 INFO L390 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 [2022-07-21 17:15:09,035 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:09,035 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:15:09,225 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1355371676] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:15:09,225 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 17:15:09,225 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 18 [2022-07-21 17:15:09,225 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547785531] [2022-07-21 17:15:09,226 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 17:15:09,226 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-07-21 17:15:09,226 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:15:09,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-07-21 17:15:09,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=436, Unknown=0, NotChecked=0, Total=506 [2022-07-21 17:15:09,227 INFO L87 Difference]: Start difference. First operand 170 states and 187 transitions. Second operand has 19 states, 18 states have (on average 3.5555555555555554) internal successors, (64), 15 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 17:15:09,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:09,855 INFO L93 Difference]: Finished difference Result 313 states and 339 transitions. [2022-07-21 17:15:09,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-07-21 17:15:09,856 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 3.5555555555555554) internal successors, (64), 15 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 36 [2022-07-21 17:15:09,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:09,857 INFO L225 Difference]: With dead ends: 313 [2022-07-21 17:15:09,858 INFO L226 Difference]: Without dead ends: 313 [2022-07-21 17:15:09,858 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=131, Invalid=739, Unknown=0, NotChecked=0, Total=870 [2022-07-21 17:15:09,859 INFO L413 NwaCegarLoop]: 116 mSDtfsCounter, 273 mSDsluCounter, 1080 mSDsCounter, 0 mSdLazyCounter, 904 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 275 SdHoareTripleChecker+Valid, 1196 SdHoareTripleChecker+Invalid, 1088 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 904 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 153 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:09,859 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [275 Valid, 1196 Invalid, 1088 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 904 Invalid, 0 Unknown, 153 Unchecked, 0.5s Time] [2022-07-21 17:15:09,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 313 states. [2022-07-21 17:15:09,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 313 to 209. [2022-07-21 17:15:09,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 164 states have (on average 1.4390243902439024) internal successors, (236), 198 states have internal predecessors, (236), 7 states have call successors, (7), 5 states have call predecessors, (7), 6 states have return successors, (13), 5 states have call predecessors, (13), 7 states have call successors, (13) [2022-07-21 17:15:09,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 256 transitions. [2022-07-21 17:15:09,865 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 256 transitions. Word has length 36 [2022-07-21 17:15:09,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:09,865 INFO L495 AbstractCegarLoop]: Abstraction has 209 states and 256 transitions. [2022-07-21 17:15:09,865 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 3.5555555555555554) internal successors, (64), 15 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 17:15:09,865 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 256 transitions. [2022-07-21 17:15:09,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-07-21 17:15:09,866 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:09,866 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:09,887 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-07-21 17:15:10,071 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-07-21 17:15:10,072 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting appendErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:10,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:10,072 INFO L85 PathProgramCache]: Analyzing trace with hash 636517819, now seen corresponding path program 1 times [2022-07-21 17:15:10,073 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:15:10,073 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [86334229] [2022-07-21 17:15:10,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:10,073 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:15:10,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:10,119 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-07-21 17:15:10,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:10,130 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-07-21 17:15:10,131 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:15:10,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [86334229] [2022-07-21 17:15:10,131 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [86334229] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:15:10,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1482221039] [2022-07-21 17:15:10,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:10,131 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:15:10,132 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:15:10,133 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 17:15:10,150 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-07-21 17:15:10,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:10,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 340 conjuncts, 2 conjunts are in the unsatisfiable core [2022-07-21 17:15:10,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:10,304 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-07-21 17:15:10,305 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 17:15:10,305 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1482221039] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:10,305 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-07-21 17:15:10,305 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2022-07-21 17:15:10,305 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733608930] [2022-07-21 17:15:10,306 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:10,306 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-21 17:15:10,306 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:15:10,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-21 17:15:10,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-07-21 17:15:10,307 INFO L87 Difference]: Start difference. First operand 209 states and 256 transitions. Second operand has 3 states, 3 states have (on average 10.0) internal successors, (30), 3 states have internal predecessors, (30), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-07-21 17:15:10,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:10,313 INFO L93 Difference]: Finished difference Result 212 states and 258 transitions. [2022-07-21 17:15:10,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-21 17:15:10,313 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.0) internal successors, (30), 3 states have internal predecessors, (30), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2022-07-21 17:15:10,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:10,315 INFO L225 Difference]: With dead ends: 212 [2022-07-21 17:15:10,315 INFO L226 Difference]: Without dead ends: 212 [2022-07-21 17:15:10,316 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-07-21 17:15:10,316 INFO L413 NwaCegarLoop]: 104 mSDtfsCounter, 0 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 203 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:10,316 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 203 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-21 17:15:10,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2022-07-21 17:15:10,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 211. [2022-07-21 17:15:10,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 166 states have (on average 1.427710843373494) internal successors, (237), 200 states have internal predecessors, (237), 7 states have call successors, (7), 5 states have call predecessors, (7), 6 states have return successors, (13), 5 states have call predecessors, (13), 7 states have call successors, (13) [2022-07-21 17:15:10,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 257 transitions. [2022-07-21 17:15:10,322 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 257 transitions. Word has length 37 [2022-07-21 17:15:10,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:10,322 INFO L495 AbstractCegarLoop]: Abstraction has 211 states and 257 transitions. [2022-07-21 17:15:10,322 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.0) internal successors, (30), 3 states have internal predecessors, (30), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-07-21 17:15:10,322 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 257 transitions. [2022-07-21 17:15:10,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-07-21 17:15:10,323 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:10,323 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:10,350 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-07-21 17:15:10,548 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-07-21 17:15:10,549 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting appendErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:10,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:10,549 INFO L85 PathProgramCache]: Analyzing trace with hash -1748599685, now seen corresponding path program 1 times [2022-07-21 17:15:10,549 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:15:10,550 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1525718149] [2022-07-21 17:15:10,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:10,550 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:15:10,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:10,614 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-07-21 17:15:10,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:10,639 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:10,640 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:15:10,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1525718149] [2022-07-21 17:15:10,640 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1525718149] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:15:10,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [520008787] [2022-07-21 17:15:10,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:10,641 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:15:10,641 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:15:10,643 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 17:15:10,644 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-07-21 17:15:10,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:10,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 3 conjunts are in the unsatisfiable core [2022-07-21 17:15:10,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:10,824 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-07-21 17:15:10,824 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 17:15:10,825 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [520008787] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:10,825 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-07-21 17:15:10,825 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2022-07-21 17:15:10,825 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859810858] [2022-07-21 17:15:10,825 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:10,826 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-21 17:15:10,826 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-21 17:15:10,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-21 17:15:10,826 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2022-07-21 17:15:10,827 INFO L87 Difference]: Start difference. First operand 211 states and 257 transitions. Second operand has 3 states, 2 states have (on average 15.0) internal successors, (30), 3 states have internal predecessors, (30), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-07-21 17:15:10,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:10,876 INFO L93 Difference]: Finished difference Result 210 states and 256 transitions. [2022-07-21 17:15:10,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-21 17:15:10,876 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 15.0) internal successors, (30), 3 states have internal predecessors, (30), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2022-07-21 17:15:10,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:10,878 INFO L225 Difference]: With dead ends: 210 [2022-07-21 17:15:10,878 INFO L226 Difference]: Without dead ends: 210 [2022-07-21 17:15:10,878 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2022-07-21 17:15:10,879 INFO L413 NwaCegarLoop]: 93 mSDtfsCounter, 15 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:10,879 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 150 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-21 17:15:10,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2022-07-21 17:15:10,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 208. [2022-07-21 17:15:10,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 166 states have (on average 1.4096385542168675) internal successors, (234), 197 states have internal predecessors, (234), 7 states have call successors, (7), 5 states have call predecessors, (7), 6 states have return successors, (13), 5 states have call predecessors, (13), 7 states have call successors, (13) [2022-07-21 17:15:10,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 254 transitions. [2022-07-21 17:15:10,885 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 254 transitions. Word has length 38 [2022-07-21 17:15:10,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:10,885 INFO L495 AbstractCegarLoop]: Abstraction has 208 states and 254 transitions. [2022-07-21 17:15:10,885 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 15.0) internal successors, (30), 3 states have internal predecessors, (30), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-07-21 17:15:10,885 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 254 transitions. [2022-07-21 17:15:10,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-07-21 17:15:10,886 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:10,886 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:10,912 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-07-21 17:15:11,110 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:15:11,110 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting appendErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:11,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:11,111 INFO L85 PathProgramCache]: Analyzing trace with hash 1429441119, now seen corresponding path program 1 times [2022-07-21 17:15:11,111 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-21 17:15:11,111 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2111834871] [2022-07-21 17:15:11,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:11,111 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-21 17:15:11,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:11,276 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-07-21 17:15:11,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:11,455 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:11,455 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-21 17:15:11,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2111834871] [2022-07-21 17:15:11,455 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2111834871] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:15:11,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1571080943] [2022-07-21 17:15:11,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:11,455 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:15:11,456 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:15:11,460 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-21 17:15:11,461 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-07-21 17:15:11,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:11,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 50 conjunts are in the unsatisfiable core [2022-07-21 17:15:11,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:11,641 INFO L390 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 [2022-07-21 17:15:11,679 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-07-21 17:15:11,679 INFO L390 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 17 treesize of output 21 [2022-07-21 17:15:11,850 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-07-21 17:15:11,898 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-07-21 17:15:11,898 INFO L390 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 16 treesize of output 22 [2022-07-21 17:15:11,907 INFO L390 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 7 treesize of output 3 [2022-07-21 17:15:11,978 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-07-21 17:15:11,979 INFO L390 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 20 treesize of output 26 [2022-07-21 17:15:12,089 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-21 17:15:12,099 INFO L356 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2022-07-21 17:15:12,099 INFO L390 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 29 treesize of output 28 [2022-07-21 17:15:12,248 INFO L356 Elim1Store]: treesize reduction 54, result has 36.5 percent of original size [2022-07-21 17:15:12,249 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 28 treesize of output 45 [2022-07-21 17:15:12,302 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 36 [2022-07-21 17:15:12,400 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 36 [2022-07-21 17:15:12,442 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 36 [2022-07-21 17:15:12,482 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-21 17:15:12,483 INFO L390 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 13 [2022-07-21 17:15:12,508 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:12,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:15:12,736 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 17:15:12,737 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 34 [2022-07-21 17:15:12,746 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 17:15:12,746 INFO L390 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 332 treesize of output 218 [2022-07-21 17:15:12,752 INFO L390 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 91 treesize of output 83 [2022-07-21 17:15:12,758 INFO L390 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 174 treesize of output 158 [2022-07-21 17:15:12,823 WARN L319 FreeRefinementEngine]: Global settings require throwing the following exception [2022-07-21 17:15:12,855 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-07-21 17:15:13,048 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-21 17:15:13,049 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.AssertionError: Quantifier not flattened at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPushUtilsForLocalEliminatees.findSomePushableLocalEliminateeSet(QuantifierPushUtilsForLocalEliminatees.java:180) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPushUtilsForLocalEliminatees.pushLocalEliminateesOverCorrespondingFiniteJunction(QuantifierPushUtilsForLocalEliminatees.java:97) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPushUtils.preprocessDualFiniteJunction(QuantifierPushUtils.java:188) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.tryToPushOverDualFiniteConnective(QuantifierPusher.java:326) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPushTermWalker.convert(QuantifierPushTermWalker.java:176) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPushTermWalker.convert(QuantifierPushTermWalker.java:1) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.TermContextTransformationEngine.transform(TermContextTransformationEngine.java:65) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.TermContextTransformationEngine.transform(TermContextTransformationEngine.java:61) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPushTermWalker.eliminate(QuantifierPushTermWalker.java:265) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPushTermWalker.eliminate(QuantifierPushTermWalker.java:251) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.PartialQuantifierElimination.eliminate(PartialQuantifierElimination.java:90) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer$QuantifierEliminationPostprocessor.postprocess(IterativePredicateTransformer.java:238) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer.applyPostprocessors(IterativePredicateTransformer.java:420) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer.computeBackwardSequence(IterativePredicateTransformer.java:364) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer.computeWeakestPreconditionSequence(IterativePredicateTransformer.java:271) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.computeInterpolantsUsingUnsatCore(TraceCheckSpWp.java:342) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.computeInterpolants(TraceCheckSpWp.java:185) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.(TraceCheckSpWp.java:163) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSpWp.construct(IpTcStrategyModuleSpWp.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSpWp.construct(IpTcStrategyModuleSpWp.java:1) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:248) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:409) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:300) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:260) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:152) 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) [2022-07-21 17:15:13,051 INFO L158 Benchmark]: Toolchain (without parser) took 14415.40ms. Allocated memory was 52.4MB in the beginning and 172.0MB in the end (delta: 119.5MB). Free memory was 29.0MB in the beginning and 82.5MB in the end (delta: -53.5MB). Peak memory consumption was 65.5MB. Max. memory is 16.1GB. [2022-07-21 17:15:13,051 INFO L158 Benchmark]: CDTParser took 0.16ms. Allocated memory is still 52.4MB. Free memory is still 34.5MB. There was no memory consumed. Max. memory is 16.1GB. [2022-07-21 17:15:13,051 INFO L158 Benchmark]: CACSL2BoogieTranslator took 386.55ms. Allocated memory was 52.4MB in the beginning and 65.0MB in the end (delta: 12.6MB). Free memory was 28.8MB in the beginning and 41.1MB in the end (delta: -12.2MB). Peak memory consumption was 7.5MB. Max. memory is 16.1GB. [2022-07-21 17:15:13,051 INFO L158 Benchmark]: Boogie Procedure Inliner took 63.12ms. Allocated memory is still 65.0MB. Free memory was 41.1MB in the beginning and 39.1MB in the end (delta: 2.0MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-07-21 17:15:13,052 INFO L158 Benchmark]: Boogie Preprocessor took 51.48ms. Allocated memory is still 65.0MB. Free memory was 39.1MB in the beginning and 37.3MB in the end (delta: 1.7MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-07-21 17:15:13,052 INFO L158 Benchmark]: RCFGBuilder took 598.97ms. Allocated memory is still 65.0MB. Free memory was 37.1MB in the beginning and 44.6MB in the end (delta: -7.4MB). Peak memory consumption was 10.6MB. Max. memory is 16.1GB. [2022-07-21 17:15:13,052 INFO L158 Benchmark]: TraceAbstraction took 13310.57ms. Allocated memory was 65.0MB in the beginning and 172.0MB in the end (delta: 107.0MB). Free memory was 44.3MB in the beginning and 82.5MB in the end (delta: -38.2MB). Peak memory consumption was 68.7MB. Max. memory is 16.1GB. [2022-07-21 17:15:13,053 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 52.4MB. Free memory is still 34.5MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 386.55ms. Allocated memory was 52.4MB in the beginning and 65.0MB in the end (delta: 12.6MB). Free memory was 28.8MB in the beginning and 41.1MB in the end (delta: -12.2MB). Peak memory consumption was 7.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 63.12ms. Allocated memory is still 65.0MB. Free memory was 41.1MB in the beginning and 39.1MB in the end (delta: 2.0MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 51.48ms. Allocated memory is still 65.0MB. Free memory was 39.1MB in the beginning and 37.3MB in the end (delta: 1.7MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 598.97ms. Allocated memory is still 65.0MB. Free memory was 37.1MB in the beginning and 44.6MB in the end (delta: -7.4MB). Peak memory consumption was 10.6MB. Max. memory is 16.1GB. * TraceAbstraction took 13310.57ms. Allocated memory was 65.0MB in the beginning and 172.0MB in the end (delta: 107.0MB). Free memory was 44.3MB in the beginning and 82.5MB in the end (delta: -38.2MB). Peak memory consumption was 68.7MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: AssertionError: Quantifier not flattened de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: AssertionError: Quantifier not flattened: de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPushUtilsForLocalEliminatees.findSomePushableLocalEliminateeSet(QuantifierPushUtilsForLocalEliminatees.java:180) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2022-07-21 17:15:13,094 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 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/memsafety-ext2/length_test03-2.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 8d477dcc38abb71f88978d460e8393ef9ba09f24c134f3de362c4df2a3599c9a --- Real Ultimate output --- This is Ultimate 0.2.2-?-3598765 [2022-07-21 17:15:14,947 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-07-21 17:15:14,950 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-07-21 17:15:14,989 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-07-21 17:15:14,989 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-07-21 17:15:14,991 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-07-21 17:15:14,994 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-07-21 17:15:14,997 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-07-21 17:15:14,999 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-07-21 17:15:15,011 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-07-21 17:15:15,017 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-07-21 17:15:15,019 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-07-21 17:15:15,020 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-07-21 17:15:15,021 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-07-21 17:15:15,022 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-07-21 17:15:15,028 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-07-21 17:15:15,029 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-07-21 17:15:15,030 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-07-21 17:15:15,032 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-07-21 17:15:15,037 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-07-21 17:15:15,038 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-07-21 17:15:15,039 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-07-21 17:15:15,040 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-07-21 17:15:15,041 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-07-21 17:15:15,042 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-07-21 17:15:15,049 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-07-21 17:15:15,049 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-07-21 17:15:15,049 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-07-21 17:15:15,050 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-07-21 17:15:15,051 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-07-21 17:15:15,052 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-07-21 17:15:15,052 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-07-21 17:15:15,053 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-07-21 17:15:15,054 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-07-21 17:15:15,055 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-07-21 17:15:15,056 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-07-21 17:15:15,056 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-07-21 17:15:15,057 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-07-21 17:15:15,057 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-07-21 17:15:15,058 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-07-21 17:15:15,058 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-07-21 17:15:15,060 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-07-21 17:15:15,065 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf [2022-07-21 17:15:15,096 INFO L113 SettingsManager]: Loading preferences was successful [2022-07-21 17:15:15,097 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-07-21 17:15:15,097 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-07-21 17:15:15,097 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-07-21 17:15:15,098 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-07-21 17:15:15,098 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-07-21 17:15:15,099 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-07-21 17:15:15,099 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-07-21 17:15:15,099 INFO L138 SettingsManager]: * Use SBE=true [2022-07-21 17:15:15,100 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-07-21 17:15:15,100 INFO L138 SettingsManager]: * sizeof long=4 [2022-07-21 17:15:15,100 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-07-21 17:15:15,100 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-07-21 17:15:15,100 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-07-21 17:15:15,100 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-07-21 17:15:15,101 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-07-21 17:15:15,101 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-07-21 17:15:15,101 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-07-21 17:15:15,101 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-07-21 17:15:15,101 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-07-21 17:15:15,102 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2022-07-21 17:15:15,102 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2022-07-21 17:15:15,102 INFO L138 SettingsManager]: * sizeof long double=12 [2022-07-21 17:15:15,102 INFO L138 SettingsManager]: * Use constant arrays=true [2022-07-21 17:15:15,102 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-07-21 17:15:15,102 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-07-21 17:15:15,102 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-07-21 17:15:15,103 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-21 17:15:15,103 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-07-21 17:15:15,103 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-07-21 17:15:15,103 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2022-07-21 17:15:15,103 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2022-07-21 17:15:15,104 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-07-21 17:15:15,104 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8d477dcc38abb71f88978d460e8393ef9ba09f24c134f3de362c4df2a3599c9a [2022-07-21 17:15:15,433 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-07-21 17:15:15,453 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-07-21 17:15:15,455 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-07-21 17:15:15,456 INFO L271 PluginConnector]: Initializing CDTParser... [2022-07-21 17:15:15,457 INFO L275 PluginConnector]: CDTParser initialized [2022-07-21 17:15:15,458 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/memsafety-ext2/length_test03-2.i [2022-07-21 17:15:15,504 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e63b2be35/0cc7290fc88e4a9289427bc4f850a2d2/FLAGce40fff6c [2022-07-21 17:15:15,981 INFO L306 CDTParser]: Found 1 translation units. [2022-07-21 17:15:15,982 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/memsafety-ext2/length_test03-2.i [2022-07-21 17:15:15,996 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e63b2be35/0cc7290fc88e4a9289427bc4f850a2d2/FLAGce40fff6c [2022-07-21 17:15:16,302 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e63b2be35/0cc7290fc88e4a9289427bc4f850a2d2 [2022-07-21 17:15:16,304 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-07-21 17:15:16,305 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-07-21 17:15:16,307 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-07-21 17:15:16,307 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-07-21 17:15:16,311 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-07-21 17:15:16,311 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 05:15:16" (1/1) ... [2022-07-21 17:15:16,312 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5892ec0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:15:16, skipping insertion in model container [2022-07-21 17:15:16,312 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 05:15:16" (1/1) ... [2022-07-21 17:15:16,318 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-07-21 17:15:16,365 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-21 17:15:16,651 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-21 17:15:16,667 INFO L203 MainTranslator]: Completed pre-run [2022-07-21 17:15:16,710 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-21 17:15:16,738 INFO L208 MainTranslator]: Completed translation [2022-07-21 17:15:16,738 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:15:16 WrapperNode [2022-07-21 17:15:16,738 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-07-21 17:15:16,740 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-07-21 17:15:16,740 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-07-21 17:15:16,741 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-07-21 17:15:16,746 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:15:16" (1/1) ... [2022-07-21 17:15:16,772 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:15:16" (1/1) ... [2022-07-21 17:15:16,802 INFO L137 Inliner]: procedures = 124, calls = 38, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 95 [2022-07-21 17:15:16,803 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-07-21 17:15:16,805 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-07-21 17:15:16,805 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-07-21 17:15:16,805 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-07-21 17:15:16,812 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:15:16" (1/1) ... [2022-07-21 17:15:16,812 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:15:16" (1/1) ... [2022-07-21 17:15:16,828 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:15:16" (1/1) ... [2022-07-21 17:15:16,829 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:15:16" (1/1) ... [2022-07-21 17:15:16,836 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:15:16" (1/1) ... [2022-07-21 17:15:16,849 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:15:16" (1/1) ... [2022-07-21 17:15:16,855 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:15:16" (1/1) ... [2022-07-21 17:15:16,862 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-07-21 17:15:16,867 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-07-21 17:15:16,867 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-07-21 17:15:16,868 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-07-21 17:15:16,869 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:15:16" (1/1) ... [2022-07-21 17:15:16,875 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-21 17:15:16,884 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-21 17:15:16,901 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) [2022-07-21 17:15:16,925 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 [2022-07-21 17:15:16,941 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-07-21 17:15:16,941 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-07-21 17:15:16,941 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-07-21 17:15:16,941 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-07-21 17:15:16,942 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2022-07-21 17:15:16,942 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-07-21 17:15:16,942 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2022-07-21 17:15:16,942 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-07-21 17:15:16,942 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-07-21 17:15:16,942 INFO L130 BoogieDeclarations]: Found specification of procedure append [2022-07-21 17:15:16,943 INFO L138 BoogieDeclarations]: Found implementation of procedure append [2022-07-21 17:15:17,084 INFO L234 CfgBuilder]: Building ICFG [2022-07-21 17:15:17,085 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-07-21 17:15:17,534 INFO L275 CfgBuilder]: Performing block encoding [2022-07-21 17:15:17,540 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-07-21 17:15:17,540 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2022-07-21 17:15:17,541 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 05:15:17 BoogieIcfgContainer [2022-07-21 17:15:17,542 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-07-21 17:15:17,543 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-07-21 17:15:17,543 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-07-21 17:15:17,545 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-07-21 17:15:17,546 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 05:15:16" (1/3) ... [2022-07-21 17:15:17,546 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@90a5018 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 05:15:17, skipping insertion in model container [2022-07-21 17:15:17,546 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:15:16" (2/3) ... [2022-07-21 17:15:17,547 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@90a5018 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 05:15:17, skipping insertion in model container [2022-07-21 17:15:17,547 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 05:15:17" (3/3) ... [2022-07-21 17:15:17,550 INFO L111 eAbstractionObserver]: Analyzing ICFG length_test03-2.i [2022-07-21 17:15:17,561 INFO L201 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-07-21 17:15:17,562 INFO L160 ceAbstractionStarter]: Applying trace abstraction to program that has 59 error locations. [2022-07-21 17:15:17,619 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-21 17:15:17,630 INFO L357 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, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@6f833a51, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@40ab15c [2022-07-21 17:15:17,630 INFO L358 AbstractCegarLoop]: Starting to check reachability of 59 error locations. [2022-07-21 17:15:17,642 INFO L276 IsEmpty]: Start isEmpty. Operand has 127 states, 64 states have (on average 2.078125) internal successors, (133), 123 states have internal predecessors, (133), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 17:15:17,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-07-21 17:15:17,646 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:17,646 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-07-21 17:15:17,647 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:17,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:17,651 INFO L85 PathProgramCache]: Analyzing trace with hash 29857, now seen corresponding path program 1 times [2022-07-21 17:15:17,666 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 17:15:17,667 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1867289888] [2022-07-21 17:15:17,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:17,668 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 17:15:17,668 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 17:15:17,671 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) [2022-07-21 17:15:17,675 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2022-07-21 17:15:17,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:17,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 3 conjunts are in the unsatisfiable core [2022-07-21 17:15:17,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:17,800 INFO L390 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 [2022-07-21 17:15:17,814 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:17,814 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 17:15:17,815 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 17:15:17,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1867289888] [2022-07-21 17:15:17,816 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1867289888] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:17,816 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:15:17,817 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-21 17:15:17,818 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574012578] [2022-07-21 17:15:17,819 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:17,822 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-21 17:15:17,823 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 17:15:17,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-21 17:15:17,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-21 17:15:17,851 INFO L87 Difference]: Start difference. First operand has 127 states, 64 states have (on average 2.078125) internal successors, (133), 123 states have internal predecessors, (133), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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) [2022-07-21 17:15:18,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:18,062 INFO L93 Difference]: Finished difference Result 164 states and 173 transitions. [2022-07-21 17:15:18,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-21 17:15:18,064 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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 3 [2022-07-21 17:15:18,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:18,071 INFO L225 Difference]: With dead ends: 164 [2022-07-21 17:15:18,071 INFO L226 Difference]: Without dead ends: 162 [2022-07-21 17:15:18,073 INFO L412 NwaCegarLoop]: 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 [2022-07-21 17:15:18,075 INFO L413 NwaCegarLoop]: 107 mSDtfsCounter, 53 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:18,076 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 168 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-21 17:15:18,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2022-07-21 17:15:18,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 123. [2022-07-21 17:15:18,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 63 states have (on average 1.9841269841269842) internal successors, (125), 119 states have internal predecessors, (125), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 17:15:18,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 129 transitions. [2022-07-21 17:15:18,111 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 129 transitions. Word has length 3 [2022-07-21 17:15:18,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:18,111 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 129 transitions. [2022-07-21 17:15:18,112 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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) [2022-07-21 17:15:18,112 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 129 transitions. [2022-07-21 17:15:18,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-07-21 17:15:18,112 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:18,112 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-07-21 17:15:18,124 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2022-07-21 17:15:18,321 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 17:15:18,321 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:18,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:18,322 INFO L85 PathProgramCache]: Analyzing trace with hash 29858, now seen corresponding path program 1 times [2022-07-21 17:15:18,322 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 17:15:18,322 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1186939373] [2022-07-21 17:15:18,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:18,323 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 17:15:18,323 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 17:15:18,324 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) [2022-07-21 17:15:18,326 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2022-07-21 17:15:18,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:18,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 4 conjunts are in the unsatisfiable core [2022-07-21 17:15:18,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:18,386 INFO L390 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 [2022-07-21 17:15:18,396 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:18,396 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 17:15:18,396 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 17:15:18,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1186939373] [2022-07-21 17:15:18,397 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1186939373] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:18,397 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:15:18,397 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-21 17:15:18,397 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1810546156] [2022-07-21 17:15:18,397 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:18,398 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-21 17:15:18,398 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 17:15:18,399 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-21 17:15:18,399 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-21 17:15:18,399 INFO L87 Difference]: Start difference. First operand 123 states and 129 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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) [2022-07-21 17:15:18,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:18,612 INFO L93 Difference]: Finished difference Result 123 states and 130 transitions. [2022-07-21 17:15:18,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-21 17:15:18,615 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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 3 [2022-07-21 17:15:18,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:18,616 INFO L225 Difference]: With dead ends: 123 [2022-07-21 17:15:18,616 INFO L226 Difference]: Without dead ends: 123 [2022-07-21 17:15:18,617 INFO L412 NwaCegarLoop]: 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 [2022-07-21 17:15:18,618 INFO L413 NwaCegarLoop]: 121 mSDtfsCounter, 10 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:18,618 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 189 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-21 17:15:18,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2022-07-21 17:15:18,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 121. [2022-07-21 17:15:18,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 63 states have (on average 1.9523809523809523) internal successors, (123), 117 states have internal predecessors, (123), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 17:15:18,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 127 transitions. [2022-07-21 17:15:18,641 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 127 transitions. Word has length 3 [2022-07-21 17:15:18,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:18,641 INFO L495 AbstractCegarLoop]: Abstraction has 121 states and 127 transitions. [2022-07-21 17:15:18,641 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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) [2022-07-21 17:15:18,641 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 127 transitions. [2022-07-21 17:15:18,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-07-21 17:15:18,642 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:18,642 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-07-21 17:15:18,655 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2022-07-21 17:15:18,855 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 17:15:18,856 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:18,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:18,856 INFO L85 PathProgramCache]: Analyzing trace with hash 889446152, now seen corresponding path program 1 times [2022-07-21 17:15:18,857 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 17:15:18,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [464422694] [2022-07-21 17:15:18,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:18,857 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 17:15:18,858 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 17:15:18,861 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) [2022-07-21 17:15:18,863 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2022-07-21 17:15:18,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:18,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 3 conjunts are in the unsatisfiable core [2022-07-21 17:15:18,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:18,923 INFO L390 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 [2022-07-21 17:15:18,927 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:18,928 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 17:15:18,928 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 17:15:18,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [464422694] [2022-07-21 17:15:18,928 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [464422694] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:18,929 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:15:18,929 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-21 17:15:18,929 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [339423685] [2022-07-21 17:15:18,929 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:18,930 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-21 17:15:18,930 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 17:15:18,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-21 17:15:18,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-21 17:15:18,931 INFO L87 Difference]: Start difference. First operand 121 states and 127 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2022-07-21 17:15:19,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:19,120 INFO L93 Difference]: Finished difference Result 138 states and 146 transitions. [2022-07-21 17:15:19,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-21 17:15:19,123 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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 6 [2022-07-21 17:15:19,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:19,125 INFO L225 Difference]: With dead ends: 138 [2022-07-21 17:15:19,125 INFO L226 Difference]: Without dead ends: 138 [2022-07-21 17:15:19,125 INFO L412 NwaCegarLoop]: 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 [2022-07-21 17:15:19,126 INFO L413 NwaCegarLoop]: 113 mSDtfsCounter, 27 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 172 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:19,127 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 172 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-21 17:15:19,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2022-07-21 17:15:19,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 124. [2022-07-21 17:15:19,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 68 states have (on average 1.8970588235294117) internal successors, (129), 120 states have internal predecessors, (129), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 17:15:19,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 133 transitions. [2022-07-21 17:15:19,143 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 133 transitions. Word has length 6 [2022-07-21 17:15:19,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:19,143 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 133 transitions. [2022-07-21 17:15:19,143 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2022-07-21 17:15:19,143 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 133 transitions. [2022-07-21 17:15:19,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-07-21 17:15:19,144 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:19,144 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-07-21 17:15:19,155 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2022-07-21 17:15:19,344 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 17:15:19,345 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:19,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:19,346 INFO L85 PathProgramCache]: Analyzing trace with hash 889446153, now seen corresponding path program 1 times [2022-07-21 17:15:19,346 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 17:15:19,346 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2108580287] [2022-07-21 17:15:19,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:19,346 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 17:15:19,347 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 17:15:19,348 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) [2022-07-21 17:15:19,374 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2022-07-21 17:15:19,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:19,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 4 conjunts are in the unsatisfiable core [2022-07-21 17:15:19,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:19,419 INFO L390 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 [2022-07-21 17:15:19,426 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:19,426 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 17:15:19,426 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 17:15:19,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2108580287] [2022-07-21 17:15:19,427 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2108580287] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:19,427 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:15:19,427 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-21 17:15:19,427 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229639879] [2022-07-21 17:15:19,427 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:19,427 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-21 17:15:19,428 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 17:15:19,428 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-21 17:15:19,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-21 17:15:19,428 INFO L87 Difference]: Start difference. First operand 124 states and 133 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2022-07-21 17:15:19,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:19,619 INFO L93 Difference]: Finished difference Result 124 states and 134 transitions. [2022-07-21 17:15:19,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-21 17:15:19,620 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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 6 [2022-07-21 17:15:19,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:19,621 INFO L225 Difference]: With dead ends: 124 [2022-07-21 17:15:19,621 INFO L226 Difference]: Without dead ends: 124 [2022-07-21 17:15:19,621 INFO L412 NwaCegarLoop]: 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 [2022-07-21 17:15:19,622 INFO L413 NwaCegarLoop]: 122 mSDtfsCounter, 4 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:19,622 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 189 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-21 17:15:19,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-07-21 17:15:19,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 122. [2022-07-21 17:15:19,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 68 states have (on average 1.8676470588235294) internal successors, (127), 118 states have internal predecessors, (127), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 17:15:19,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 131 transitions. [2022-07-21 17:15:19,636 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 131 transitions. Word has length 6 [2022-07-21 17:15:19,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:19,636 INFO L495 AbstractCegarLoop]: Abstraction has 122 states and 131 transitions. [2022-07-21 17:15:19,636 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2022-07-21 17:15:19,636 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 131 transitions. [2022-07-21 17:15:19,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-07-21 17:15:19,637 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:19,637 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:19,654 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2022-07-21 17:15:19,849 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 17:15:19,849 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting appendErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:19,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:19,850 INFO L85 PathProgramCache]: Analyzing trace with hash 1036549323, now seen corresponding path program 1 times [2022-07-21 17:15:19,850 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 17:15:19,851 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1596320895] [2022-07-21 17:15:19,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:19,851 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 17:15:19,851 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 17:15:19,852 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) [2022-07-21 17:15:19,854 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2022-07-21 17:15:19,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:19,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2022-07-21 17:15:19,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:19,935 INFO L390 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 [2022-07-21 17:15:19,939 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:19,939 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 17:15:19,939 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 17:15:19,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1596320895] [2022-07-21 17:15:19,940 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1596320895] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:19,940 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:15:19,940 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-21 17:15:19,940 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304893837] [2022-07-21 17:15:19,940 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:19,941 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-21 17:15:19,941 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 17:15:19,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-21 17:15:19,942 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-21 17:15:19,942 INFO L87 Difference]: Start difference. First operand 122 states and 131 transitions. Second operand has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:15:20,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:20,095 INFO L93 Difference]: Finished difference Result 117 states and 126 transitions. [2022-07-21 17:15:20,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-21 17:15:20,096 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-07-21 17:15:20,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:20,097 INFO L225 Difference]: With dead ends: 117 [2022-07-21 17:15:20,097 INFO L226 Difference]: Without dead ends: 117 [2022-07-21 17:15:20,097 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-21 17:15:20,098 INFO L413 NwaCegarLoop]: 92 mSDtfsCounter, 43 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:20,098 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 136 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-21 17:15:20,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2022-07-21 17:15:20,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2022-07-21 17:15:20,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 68 states have (on average 1.7941176470588236) internal successors, (122), 113 states have internal predecessors, (122), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 17:15:20,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 126 transitions. [2022-07-21 17:15:20,105 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 126 transitions. Word has length 12 [2022-07-21 17:15:20,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:20,105 INFO L495 AbstractCegarLoop]: Abstraction has 117 states and 126 transitions. [2022-07-21 17:15:20,105 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:15:20,106 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 126 transitions. [2022-07-21 17:15:20,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-07-21 17:15:20,106 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:20,106 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:20,118 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2022-07-21 17:15:20,315 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 17:15:20,316 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting appendErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:20,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:20,316 INFO L85 PathProgramCache]: Analyzing trace with hash 1036549324, now seen corresponding path program 1 times [2022-07-21 17:15:20,316 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 17:15:20,317 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2046717453] [2022-07-21 17:15:20,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:20,317 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 17:15:20,317 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 17:15:20,318 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) [2022-07-21 17:15:20,320 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2022-07-21 17:15:20,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:20,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 4 conjunts are in the unsatisfiable core [2022-07-21 17:15:20,410 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:20,421 INFO L390 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 [2022-07-21 17:15:20,430 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:20,430 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 17:15:20,430 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 17:15:20,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2046717453] [2022-07-21 17:15:20,431 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2046717453] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:20,431 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:15:20,431 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-21 17:15:20,431 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769126262] [2022-07-21 17:15:20,431 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:20,432 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-21 17:15:20,432 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 17:15:20,432 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-21 17:15:20,432 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-21 17:15:20,433 INFO L87 Difference]: Start difference. First operand 117 states and 126 transitions. Second operand has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:15:20,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:20,581 INFO L93 Difference]: Finished difference Result 112 states and 121 transitions. [2022-07-21 17:15:20,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-21 17:15:20,582 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-07-21 17:15:20,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:20,582 INFO L225 Difference]: With dead ends: 112 [2022-07-21 17:15:20,582 INFO L226 Difference]: Without dead ends: 112 [2022-07-21 17:15:20,583 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-21 17:15:20,583 INFO L413 NwaCegarLoop]: 92 mSDtfsCounter, 38 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:20,584 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 145 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-21 17:15:20,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2022-07-21 17:15:20,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2022-07-21 17:15:20,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 68 states have (on average 1.7205882352941178) internal successors, (117), 108 states have internal predecessors, (117), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 17:15:20,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 121 transitions. [2022-07-21 17:15:20,602 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 121 transitions. Word has length 12 [2022-07-21 17:15:20,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:20,603 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 121 transitions. [2022-07-21 17:15:20,603 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:15:20,603 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 121 transitions. [2022-07-21 17:15:20,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-07-21 17:15:20,604 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:20,604 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:20,612 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Ended with exit code 0 [2022-07-21 17:15:20,812 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 17:15:20,812 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:20,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:20,813 INFO L85 PathProgramCache]: Analyzing trace with hash 2068258039, now seen corresponding path program 1 times [2022-07-21 17:15:20,813 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 17:15:20,813 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1275404371] [2022-07-21 17:15:20,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:20,813 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 17:15:20,813 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 17:15:20,814 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) [2022-07-21 17:15:20,815 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2022-07-21 17:15:20,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:20,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 11 conjunts are in the unsatisfiable core [2022-07-21 17:15:20,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:20,923 INFO L390 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 [2022-07-21 17:15:20,969 INFO L356 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-07-21 17:15:20,971 INFO L390 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 17 treesize of output 24 [2022-07-21 17:15:21,024 INFO L356 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2022-07-21 17:15:21,025 INFO L390 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 [2022-07-21 17:15:21,046 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:21,046 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 17:15:21,046 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 17:15:21,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1275404371] [2022-07-21 17:15:21,047 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1275404371] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:21,047 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:15:21,047 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-07-21 17:15:21,047 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [595454374] [2022-07-21 17:15:21,047 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:21,048 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-07-21 17:15:21,048 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 17:15:21,048 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-07-21 17:15:21,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-07-21 17:15:21,049 INFO L87 Difference]: Start difference. First operand 112 states and 121 transitions. Second operand has 5 states, 4 states have (on average 3.0) internal successors, (12), 4 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) [2022-07-21 17:15:21,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:21,477 INFO L93 Difference]: Finished difference Result 177 states and 191 transitions. [2022-07-21 17:15:21,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-07-21 17:15:21,478 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 4 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 [2022-07-21 17:15:21,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:21,479 INFO L225 Difference]: With dead ends: 177 [2022-07-21 17:15:21,480 INFO L226 Difference]: Without dead ends: 177 [2022-07-21 17:15:21,480 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-07-21 17:15:21,481 INFO L413 NwaCegarLoop]: 63 mSDtfsCounter, 136 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 197 SdHoareTripleChecker+Invalid, 204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:21,481 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [136 Valid, 197 Invalid, 204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 187 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-07-21 17:15:21,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2022-07-21 17:15:21,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 130. [2022-07-21 17:15:21,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 91 states have (on average 1.6153846153846154) internal successors, (147), 125 states have internal predecessors, (147), 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) [2022-07-21 17:15:21,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 151 transitions. [2022-07-21 17:15:21,490 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 151 transitions. Word has length 13 [2022-07-21 17:15:21,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:21,491 INFO L495 AbstractCegarLoop]: Abstraction has 130 states and 151 transitions. [2022-07-21 17:15:21,491 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 4 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) [2022-07-21 17:15:21,491 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 151 transitions. [2022-07-21 17:15:21,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-07-21 17:15:21,492 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:21,492 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:21,503 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Ended with exit code 0 [2022-07-21 17:15:21,703 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 17:15:21,703 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting appendErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:21,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:21,704 INFO L85 PathProgramCache]: Analyzing trace with hash 2068258040, now seen corresponding path program 1 times [2022-07-21 17:15:21,704 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 17:15:21,704 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [294109694] [2022-07-21 17:15:21,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:21,704 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 17:15:21,705 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 17:15:21,706 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) [2022-07-21 17:15:21,706 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2022-07-21 17:15:21,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:21,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 16 conjunts are in the unsatisfiable core [2022-07-21 17:15:21,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:21,818 INFO L390 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 [2022-07-21 17:15:21,823 INFO L390 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 [2022-07-21 17:15:21,859 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 17:15:21,860 INFO L390 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 [2022-07-21 17:15:21,869 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-21 17:15:21,869 INFO L390 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 [2022-07-21 17:15:21,930 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-07-21 17:15:21,931 INFO L390 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 [2022-07-21 17:15:21,980 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:21,981 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 17:15:21,981 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 17:15:21,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [294109694] [2022-07-21 17:15:21,981 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [294109694] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:21,981 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:15:21,982 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-07-21 17:15:21,982 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990435157] [2022-07-21 17:15:21,982 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:21,982 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-07-21 17:15:21,982 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 17:15:21,983 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-07-21 17:15:21,983 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-07-21 17:15:21,983 INFO L87 Difference]: Start difference. First operand 130 states and 151 transitions. Second operand has 6 states, 5 states have (on average 2.4) internal successors, (12), 5 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) [2022-07-21 17:15:22,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:22,200 INFO L93 Difference]: Finished difference Result 135 states and 157 transitions. [2022-07-21 17:15:22,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-07-21 17:15:22,200 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.4) internal successors, (12), 5 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 [2022-07-21 17:15:22,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:22,201 INFO L225 Difference]: With dead ends: 135 [2022-07-21 17:15:22,201 INFO L226 Difference]: Without dead ends: 135 [2022-07-21 17:15:22,202 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-07-21 17:15:22,202 INFO L413 NwaCegarLoop]: 100 mSDtfsCounter, 6 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 287 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 43 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:22,203 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 287 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 89 Invalid, 0 Unknown, 43 Unchecked, 0.2s Time] [2022-07-21 17:15:22,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2022-07-21 17:15:22,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2022-07-21 17:15:22,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 95 states have (on average 1.5894736842105264) internal successors, (151), 129 states have internal predecessors, (151), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-07-21 17:15:22,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 157 transitions. [2022-07-21 17:15:22,207 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 157 transitions. Word has length 13 [2022-07-21 17:15:22,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:22,208 INFO L495 AbstractCegarLoop]: Abstraction has 135 states and 157 transitions. [2022-07-21 17:15:22,208 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.4) internal successors, (12), 5 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) [2022-07-21 17:15:22,208 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 157 transitions. [2022-07-21 17:15:22,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-07-21 17:15:22,208 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:22,208 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:22,218 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2022-07-21 17:15:22,418 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 17:15:22,418 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting appendErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:22,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:22,418 INFO L85 PathProgramCache]: Analyzing trace with hash -125488176, now seen corresponding path program 1 times [2022-07-21 17:15:22,419 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 17:15:22,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1581581732] [2022-07-21 17:15:22,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:22,419 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 17:15:22,419 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 17:15:22,420 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) [2022-07-21 17:15:22,421 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2022-07-21 17:15:22,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:22,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 16 conjunts are in the unsatisfiable core [2022-07-21 17:15:22,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:22,526 INFO L390 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 [2022-07-21 17:15:22,530 INFO L390 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 [2022-07-21 17:15:22,571 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 17:15:22,572 INFO L390 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 [2022-07-21 17:15:22,580 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-21 17:15:22,580 INFO L390 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 [2022-07-21 17:15:22,634 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-07-21 17:15:22,634 INFO L390 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 [2022-07-21 17:15:22,730 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:22,730 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 17:15:22,731 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 17:15:22,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1581581732] [2022-07-21 17:15:22,731 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1581581732] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:22,731 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:15:22,731 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-07-21 17:15:22,731 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263187626] [2022-07-21 17:15:22,734 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:22,735 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-07-21 17:15:22,735 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 17:15:22,735 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-07-21 17:15:22,736 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-07-21 17:15:22,736 INFO L87 Difference]: Start difference. First operand 135 states and 157 transitions. Second operand has 6 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 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) [2022-07-21 17:15:22,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:22,924 INFO L93 Difference]: Finished difference Result 141 states and 167 transitions. [2022-07-21 17:15:22,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-07-21 17:15:22,925 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 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 16 [2022-07-21 17:15:22,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:22,926 INFO L225 Difference]: With dead ends: 141 [2022-07-21 17:15:22,926 INFO L226 Difference]: Without dead ends: 141 [2022-07-21 17:15:22,926 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-07-21 17:15:22,927 INFO L413 NwaCegarLoop]: 95 mSDtfsCounter, 9 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 283 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 43 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:22,927 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 283 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 79 Invalid, 0 Unknown, 43 Unchecked, 0.2s Time] [2022-07-21 17:15:22,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2022-07-21 17:15:22,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 138. [2022-07-21 17:15:22,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 98 states have (on average 1.5816326530612246) internal successors, (155), 132 states have internal predecessors, (155), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-07-21 17:15:22,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 161 transitions. [2022-07-21 17:15:22,932 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 161 transitions. Word has length 16 [2022-07-21 17:15:22,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:22,932 INFO L495 AbstractCegarLoop]: Abstraction has 138 states and 161 transitions. [2022-07-21 17:15:22,932 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 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) [2022-07-21 17:15:22,932 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 161 transitions. [2022-07-21 17:15:22,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-07-21 17:15:22,933 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:22,933 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:22,943 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2022-07-21 17:15:23,143 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 17:15:23,143 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting appendErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:23,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:23,144 INFO L85 PathProgramCache]: Analyzing trace with hash 404839970, now seen corresponding path program 1 times [2022-07-21 17:15:23,144 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 17:15:23,144 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1297820174] [2022-07-21 17:15:23,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:23,144 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 17:15:23,144 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 17:15:23,145 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) [2022-07-21 17:15:23,147 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2022-07-21 17:15:23,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:23,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 2 conjunts are in the unsatisfiable core [2022-07-21 17:15:23,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:23,229 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:23,229 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 17:15:23,229 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 17:15:23,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1297820174] [2022-07-21 17:15:23,229 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1297820174] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:23,229 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:15:23,230 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-21 17:15:23,230 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1709117928] [2022-07-21 17:15:23,230 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:23,230 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-21 17:15:23,230 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 17:15:23,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-21 17:15:23,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-21 17:15:23,231 INFO L87 Difference]: Start difference. First operand 138 states and 161 transitions. Second operand has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 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) [2022-07-21 17:15:23,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:23,238 INFO L93 Difference]: Finished difference Result 140 states and 163 transitions. [2022-07-21 17:15:23,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-21 17:15:23,238 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 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 17 [2022-07-21 17:15:23,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:23,239 INFO L225 Difference]: With dead ends: 140 [2022-07-21 17:15:23,239 INFO L226 Difference]: Without dead ends: 140 [2022-07-21 17:15:23,239 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-21 17:15:23,240 INFO L413 NwaCegarLoop]: 106 mSDtfsCounter, 0 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 207 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:23,240 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 207 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-21 17:15:23,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2022-07-21 17:15:23,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 140. [2022-07-21 17:15:23,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 100 states have (on average 1.57) internal successors, (157), 134 states have internal predecessors, (157), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-07-21 17:15:23,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 163 transitions. [2022-07-21 17:15:23,244 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 163 transitions. Word has length 17 [2022-07-21 17:15:23,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:23,244 INFO L495 AbstractCegarLoop]: Abstraction has 140 states and 163 transitions. [2022-07-21 17:15:23,244 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 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) [2022-07-21 17:15:23,244 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 163 transitions. [2022-07-21 17:15:23,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-07-21 17:15:23,245 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:23,245 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:23,257 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2022-07-21 17:15:23,445 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 17:15:23,446 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting appendErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:23,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:23,446 INFO L85 PathProgramCache]: Analyzing trace with hash 404840386, now seen corresponding path program 1 times [2022-07-21 17:15:23,446 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 17:15:23,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1341604722] [2022-07-21 17:15:23,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:23,447 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 17:15:23,447 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 17:15:23,448 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) [2022-07-21 17:15:23,449 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2022-07-21 17:15:23,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:23,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 16 conjunts are in the unsatisfiable core [2022-07-21 17:15:23,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:23,561 INFO L390 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 [2022-07-21 17:15:23,567 INFO L390 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 [2022-07-21 17:15:23,595 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 17:15:23,596 INFO L390 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 [2022-07-21 17:15:23,604 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-21 17:15:23,605 INFO L390 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 [2022-07-21 17:15:23,672 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-07-21 17:15:23,673 INFO L390 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 [2022-07-21 17:15:23,790 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:23,790 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 17:15:23,790 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 17:15:23,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1341604722] [2022-07-21 17:15:23,791 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1341604722] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:23,791 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:15:23,791 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-07-21 17:15:23,791 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885897742] [2022-07-21 17:15:23,791 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:23,792 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-07-21 17:15:23,792 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 17:15:23,792 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-07-21 17:15:23,792 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-07-21 17:15:23,793 INFO L87 Difference]: Start difference. First operand 140 states and 163 transitions. Second operand has 6 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 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) [2022-07-21 17:15:24,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:24,049 INFO L93 Difference]: Finished difference Result 142 states and 165 transitions. [2022-07-21 17:15:24,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-07-21 17:15:24,049 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 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 17 [2022-07-21 17:15:24,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:24,050 INFO L225 Difference]: With dead ends: 142 [2022-07-21 17:15:24,050 INFO L226 Difference]: Without dead ends: 142 [2022-07-21 17:15:24,051 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-07-21 17:15:24,051 INFO L413 NwaCegarLoop]: 98 mSDtfsCounter, 7 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 329 SdHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 43 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:24,052 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 329 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 139 Invalid, 0 Unknown, 43 Unchecked, 0.2s Time] [2022-07-21 17:15:24,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2022-07-21 17:15:24,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2022-07-21 17:15:24,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 102 states have (on average 1.5588235294117647) internal successors, (159), 136 states have internal predecessors, (159), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-07-21 17:15:24,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 165 transitions. [2022-07-21 17:15:24,055 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 165 transitions. Word has length 17 [2022-07-21 17:15:24,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:24,056 INFO L495 AbstractCegarLoop]: Abstraction has 142 states and 165 transitions. [2022-07-21 17:15:24,056 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 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) [2022-07-21 17:15:24,056 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 165 transitions. [2022-07-21 17:15:24,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-07-21 17:15:24,056 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:24,056 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:24,068 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2022-07-21 17:15:24,257 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 17:15:24,257 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting appendErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:24,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:24,258 INFO L85 PathProgramCache]: Analyzing trace with hash -1796626049, now seen corresponding path program 1 times [2022-07-21 17:15:24,258 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 17:15:24,258 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2124526395] [2022-07-21 17:15:24,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:24,258 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 17:15:24,258 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 17:15:24,259 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) [2022-07-21 17:15:24,260 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2022-07-21 17:15:24,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:24,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 5 conjunts are in the unsatisfiable core [2022-07-21 17:15:24,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:24,428 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:24,428 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 17:15:24,428 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 17:15:24,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2124526395] [2022-07-21 17:15:24,428 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2124526395] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:24,428 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:15:24,429 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-07-21 17:15:24,429 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197831206] [2022-07-21 17:15:24,429 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:24,429 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-07-21 17:15:24,429 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 17:15:24,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-07-21 17:15:24,430 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-07-21 17:15:24,430 INFO L87 Difference]: Start difference. First operand 142 states and 165 transitions. Second operand has 6 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 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) [2022-07-21 17:15:24,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:24,625 INFO L93 Difference]: Finished difference Result 149 states and 163 transitions. [2022-07-21 17:15:24,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-07-21 17:15:24,626 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 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 19 [2022-07-21 17:15:24,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:24,627 INFO L225 Difference]: With dead ends: 149 [2022-07-21 17:15:24,627 INFO L226 Difference]: Without dead ends: 149 [2022-07-21 17:15:24,627 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2022-07-21 17:15:24,628 INFO L413 NwaCegarLoop]: 80 mSDtfsCounter, 142 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 144 SdHoareTripleChecker+Valid, 276 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:24,628 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [144 Valid, 276 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-21 17:15:24,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2022-07-21 17:15:24,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 141. [2022-07-21 17:15:24,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 102 states have (on average 1.5392156862745099) internal successors, (157), 135 states have internal predecessors, (157), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-07-21 17:15:24,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 163 transitions. [2022-07-21 17:15:24,632 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 163 transitions. Word has length 19 [2022-07-21 17:15:24,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:24,632 INFO L495 AbstractCegarLoop]: Abstraction has 141 states and 163 transitions. [2022-07-21 17:15:24,633 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 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) [2022-07-21 17:15:24,633 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 163 transitions. [2022-07-21 17:15:24,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-07-21 17:15:24,633 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:24,633 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:24,643 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2022-07-21 17:15:24,843 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 17:15:24,843 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting appendErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:24,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:24,844 INFO L85 PathProgramCache]: Analyzing trace with hash -1796625633, now seen corresponding path program 1 times [2022-07-21 17:15:24,844 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 17:15:24,844 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1854833033] [2022-07-21 17:15:24,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:24,844 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 17:15:24,845 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 17:15:24,846 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 17:15:24,847 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2022-07-21 17:15:24,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:24,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 5 conjunts are in the unsatisfiable core [2022-07-21 17:15:24,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:24,989 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:24,989 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 17:15:24,989 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 17:15:24,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1854833033] [2022-07-21 17:15:24,990 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1854833033] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:24,990 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:15:24,990 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-07-21 17:15:24,990 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481063761] [2022-07-21 17:15:24,990 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:24,990 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-07-21 17:15:24,990 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 17:15:24,991 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-07-21 17:15:24,991 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-07-21 17:15:24,991 INFO L87 Difference]: Start difference. First operand 141 states and 163 transitions. Second operand has 6 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 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) [2022-07-21 17:15:25,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:25,325 INFO L93 Difference]: Finished difference Result 147 states and 161 transitions. [2022-07-21 17:15:25,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-07-21 17:15:25,327 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 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 19 [2022-07-21 17:15:25,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:25,328 INFO L225 Difference]: With dead ends: 147 [2022-07-21 17:15:25,328 INFO L226 Difference]: Without dead ends: 147 [2022-07-21 17:15:25,328 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2022-07-21 17:15:25,328 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 110 mSDsluCounter, 261 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 345 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:25,329 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [112 Valid, 345 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-07-21 17:15:25,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2022-07-21 17:15:25,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 141. [2022-07-21 17:15:25,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 102 states have (on average 1.5098039215686274) internal successors, (154), 135 states have internal predecessors, (154), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-07-21 17:15:25,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 160 transitions. [2022-07-21 17:15:25,333 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 160 transitions. Word has length 19 [2022-07-21 17:15:25,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:25,333 INFO L495 AbstractCegarLoop]: Abstraction has 141 states and 160 transitions. [2022-07-21 17:15:25,333 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 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) [2022-07-21 17:15:25,333 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 160 transitions. [2022-07-21 17:15:25,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-07-21 17:15:25,334 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:25,334 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:25,346 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2022-07-21 17:15:25,535 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 17:15:25,535 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting appendErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:25,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:25,536 INFO L85 PathProgramCache]: Analyzing trace with hash 1101942182, now seen corresponding path program 1 times [2022-07-21 17:15:25,536 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 17:15:25,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1193351608] [2022-07-21 17:15:25,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:25,537 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 17:15:25,537 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 17:15:25,538 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) [2022-07-21 17:15:25,557 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2022-07-21 17:15:25,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:25,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 36 conjunts are in the unsatisfiable core [2022-07-21 17:15:25,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:25,693 INFO L390 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 [2022-07-21 17:15:25,713 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-07-21 17:15:25,717 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-07-21 17:15:25,752 INFO L356 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-07-21 17:15:25,753 INFO L390 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 21 treesize of output 20 [2022-07-21 17:15:25,761 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 17:15:25,762 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2022-07-21 17:15:25,788 INFO L356 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-07-21 17:15:25,789 INFO L390 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 17 treesize of output 24 [2022-07-21 17:15:25,820 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-07-21 17:15:25,826 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-07-21 17:15:25,843 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-07-21 17:15:25,848 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-07-21 17:15:25,974 INFO L356 Elim1Store]: treesize reduction 8, result has 52.9 percent of original size [2022-07-21 17:15:25,974 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 21 [2022-07-21 17:15:26,005 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-07-21 17:15:26,010 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-07-21 17:15:26,033 INFO L390 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 15 treesize of output 7 [2022-07-21 17:15:26,036 INFO L390 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 15 treesize of output 7 [2022-07-21 17:15:26,066 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:26,066 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 17:15:26,066 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 17:15:26,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1193351608] [2022-07-21 17:15:26,066 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1193351608] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:26,066 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:15:26,066 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-07-21 17:15:26,066 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810196294] [2022-07-21 17:15:26,067 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:26,067 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-07-21 17:15:26,067 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 17:15:26,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-07-21 17:15:26,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2022-07-21 17:15:26,068 INFO L87 Difference]: Start difference. First operand 141 states and 160 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 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) [2022-07-21 17:15:26,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:26,574 INFO L93 Difference]: Finished difference Result 187 states and 208 transitions. [2022-07-21 17:15:26,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-07-21 17:15:26,574 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 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 22 [2022-07-21 17:15:26,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:26,575 INFO L225 Difference]: With dead ends: 187 [2022-07-21 17:15:26,575 INFO L226 Difference]: Without dead ends: 187 [2022-07-21 17:15:26,576 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2022-07-21 17:15:26,576 INFO L413 NwaCegarLoop]: 75 mSDtfsCounter, 63 mSDsluCounter, 459 mSDsCounter, 0 mSdLazyCounter, 290 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 534 SdHoareTripleChecker+Invalid, 376 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 75 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:26,576 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 534 Invalid, 376 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 290 Invalid, 0 Unknown, 75 Unchecked, 0.5s Time] [2022-07-21 17:15:26,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2022-07-21 17:15:26,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 140. [2022-07-21 17:15:26,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 101 states have (on average 1.504950495049505) internal successors, (152), 134 states have internal predecessors, (152), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-07-21 17:15:26,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 158 transitions. [2022-07-21 17:15:26,580 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 158 transitions. Word has length 22 [2022-07-21 17:15:26,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:26,581 INFO L495 AbstractCegarLoop]: Abstraction has 140 states and 158 transitions. [2022-07-21 17:15:26,581 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 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) [2022-07-21 17:15:26,581 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 158 transitions. [2022-07-21 17:15:26,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-07-21 17:15:26,581 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:26,582 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:26,595 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2022-07-21 17:15:26,792 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 17:15:26,793 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting appendErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:26,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:26,793 INFO L85 PathProgramCache]: Analyzing trace with hash 470783081, now seen corresponding path program 1 times [2022-07-21 17:15:26,794 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 17:15:26,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [284024412] [2022-07-21 17:15:26,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:26,794 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 17:15:26,794 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 17:15:26,795 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) [2022-07-21 17:15:26,796 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2022-07-21 17:15:26,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:26,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 31 conjunts are in the unsatisfiable core [2022-07-21 17:15:26,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:26,951 INFO L390 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 [2022-07-21 17:15:26,962 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-07-21 17:15:26,968 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-07-21 17:15:27,012 INFO L356 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-07-21 17:15:27,012 INFO L390 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 17 treesize of output 24 [2022-07-21 17:15:27,041 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-07-21 17:15:27,048 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-07-21 17:15:27,060 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-07-21 17:15:27,065 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-07-21 17:15:27,135 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-21 17:15:27,136 INFO L390 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 12 treesize of output 12 [2022-07-21 17:15:27,171 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-07-21 17:15:27,175 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-07-21 17:15:27,220 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2022-07-21 17:15:27,223 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2022-07-21 17:15:27,252 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:27,253 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 17:15:27,253 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 17:15:27,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [284024412] [2022-07-21 17:15:27,253 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [284024412] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:27,253 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:15:27,253 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-07-21 17:15:27,253 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1625596546] [2022-07-21 17:15:27,253 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:27,254 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-21 17:15:27,254 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 17:15:27,254 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-21 17:15:27,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-07-21 17:15:27,254 INFO L87 Difference]: Start difference. First operand 140 states and 158 transitions. Second operand has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:15:27,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:27,803 INFO L93 Difference]: Finished difference Result 180 states and 200 transitions. [2022-07-21 17:15:27,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-07-21 17:15:27,804 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-07-21 17:15:27,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:27,805 INFO L225 Difference]: With dead ends: 180 [2022-07-21 17:15:27,805 INFO L226 Difference]: Without dead ends: 180 [2022-07-21 17:15:27,805 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2022-07-21 17:15:27,806 INFO L413 NwaCegarLoop]: 79 mSDtfsCounter, 51 mSDsluCounter, 402 mSDsCounter, 0 mSdLazyCounter, 291 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 481 SdHoareTripleChecker+Invalid, 309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:27,806 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 481 Invalid, 309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 291 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-07-21 17:15:27,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2022-07-21 17:15:27,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 142. [2022-07-21 17:15:27,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 103 states have (on average 1.4951456310679612) internal successors, (154), 136 states have internal predecessors, (154), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-07-21 17:15:27,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 160 transitions. [2022-07-21 17:15:27,810 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 160 transitions. Word has length 24 [2022-07-21 17:15:27,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:27,811 INFO L495 AbstractCegarLoop]: Abstraction has 142 states and 160 transitions. [2022-07-21 17:15:27,811 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-21 17:15:27,811 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 160 transitions. [2022-07-21 17:15:27,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-07-21 17:15:27,812 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:27,812 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:27,823 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Ended with exit code 0 [2022-07-21 17:15:28,019 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 17:15:28,019 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:28,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:28,020 INFO L85 PathProgramCache]: Analyzing trace with hash -1370163219, now seen corresponding path program 1 times [2022-07-21 17:15:28,020 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 17:15:28,021 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [929625063] [2022-07-21 17:15:28,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:28,021 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 17:15:28,021 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 17:15:28,022 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) [2022-07-21 17:15:28,024 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2022-07-21 17:15:28,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:28,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 2 conjunts are in the unsatisfiable core [2022-07-21 17:15:28,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:28,150 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:28,151 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 17:15:28,151 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 17:15:28,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [929625063] [2022-07-21 17:15:28,151 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [929625063] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:15:28,151 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:15:28,151 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-21 17:15:28,152 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588288928] [2022-07-21 17:15:28,152 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:15:28,152 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-07-21 17:15:28,152 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 17:15:28,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-07-21 17:15:28,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-21 17:15:28,153 INFO L87 Difference]: Start difference. First operand 142 states and 160 transitions. Second operand has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 3 states have internal predecessors, (26), 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) [2022-07-21 17:15:28,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:28,169 INFO L93 Difference]: Finished difference Result 150 states and 164 transitions. [2022-07-21 17:15:28,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-07-21 17:15:28,169 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 3 states have internal predecessors, (26), 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 28 [2022-07-21 17:15:28,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:28,170 INFO L225 Difference]: With dead ends: 150 [2022-07-21 17:15:28,170 INFO L226 Difference]: Without dead ends: 150 [2022-07-21 17:15:28,171 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-07-21 17:15:28,171 INFO L413 NwaCegarLoop]: 103 mSDtfsCounter, 12 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:28,171 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 200 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-21 17:15:28,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2022-07-21 17:15:28,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 137. [2022-07-21 17:15:28,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 98 states have (on average 1.469387755102041) internal successors, (144), 131 states have internal predecessors, (144), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-07-21 17:15:28,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 150 transitions. [2022-07-21 17:15:28,176 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 150 transitions. Word has length 28 [2022-07-21 17:15:28,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:28,176 INFO L495 AbstractCegarLoop]: Abstraction has 137 states and 150 transitions. [2022-07-21 17:15:28,176 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 3 states have internal predecessors, (26), 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) [2022-07-21 17:15:28,176 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 150 transitions. [2022-07-21 17:15:28,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-07-21 17:15:28,177 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:28,177 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:28,189 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2022-07-21 17:15:28,389 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 17:15:28,389 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting appendErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:28,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:28,390 INFO L85 PathProgramCache]: Analyzing trace with hash 1879513347, now seen corresponding path program 1 times [2022-07-21 17:15:28,390 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 17:15:28,390 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1379793776] [2022-07-21 17:15:28,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:28,391 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 17:15:28,391 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 17:15:28,392 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 17:15:28,393 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2022-07-21 17:15:28,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:28,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 18 conjunts are in the unsatisfiable core [2022-07-21 17:15:28,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:28,756 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 17:15:28,757 INFO L390 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 [2022-07-21 17:15:28,767 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-21 17:15:28,767 INFO L390 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 12 treesize of output 12 [2022-07-21 17:15:28,790 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:28,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:15:29,139 INFO L173 IndexEqualityManager]: detected equality via solver [2022-07-21 17:15:29,141 INFO L390 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 22 treesize of output 18 [2022-07-21 17:15:31,470 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 17:15:31,470 INFO L390 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 [2022-07-21 17:15:31,491 INFO L356 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-07-21 17:15:31,491 INFO L390 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 15 treesize of output 14 [2022-07-21 17:15:31,724 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 2 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:31,724 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 17:15:31,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1379793776] [2022-07-21 17:15:31,725 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1379793776] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 17:15:31,725 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 17:15:31,725 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 13 [2022-07-21 17:15:31,725 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565720302] [2022-07-21 17:15:31,725 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 17:15:31,725 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-07-21 17:15:31,725 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 17:15:31,726 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-07-21 17:15:31,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=145, Unknown=1, NotChecked=0, Total=182 [2022-07-21 17:15:31,726 INFO L87 Difference]: Start difference. First operand 137 states and 150 transitions. Second operand has 14 states, 13 states have (on average 4.076923076923077) internal successors, (53), 12 states have internal predecessors, (53), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 17:15:32,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:32,856 INFO L93 Difference]: Finished difference Result 147 states and 155 transitions. [2022-07-21 17:15:32,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-21 17:15:32,857 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 4.076923076923077) internal successors, (53), 12 states have internal predecessors, (53), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 30 [2022-07-21 17:15:32,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:32,858 INFO L225 Difference]: With dead ends: 147 [2022-07-21 17:15:32,858 INFO L226 Difference]: Without dead ends: 147 [2022-07-21 17:15:32,858 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=62, Invalid=209, Unknown=1, NotChecked=0, Total=272 [2022-07-21 17:15:32,859 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 313 mSDsluCounter, 399 mSDsCounter, 0 mSdLazyCounter, 312 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 315 SdHoareTripleChecker+Valid, 483 SdHoareTripleChecker+Invalid, 508 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 312 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 183 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:32,859 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [315 Valid, 483 Invalid, 508 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 312 Invalid, 0 Unknown, 183 Unchecked, 0.9s Time] [2022-07-21 17:15:32,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2022-07-21 17:15:32,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 141. [2022-07-21 17:15:32,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 102 states have (on average 1.411764705882353) internal successors, (144), 135 states have internal predecessors, (144), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-07-21 17:15:32,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 150 transitions. [2022-07-21 17:15:32,863 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 150 transitions. Word has length 30 [2022-07-21 17:15:32,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:32,864 INFO L495 AbstractCegarLoop]: Abstraction has 141 states and 150 transitions. [2022-07-21 17:15:32,864 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 4.076923076923077) internal successors, (53), 12 states have internal predecessors, (53), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-21 17:15:32,864 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 150 transitions. [2022-07-21 17:15:32,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-07-21 17:15:32,865 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:32,865 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:32,876 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2022-07-21 17:15:33,076 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 17:15:33,077 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:33,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:33,077 INFO L85 PathProgramCache]: Analyzing trace with hash 842656368, now seen corresponding path program 1 times [2022-07-21 17:15:33,077 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 17:15:33,078 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1012669110] [2022-07-21 17:15:33,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:33,078 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 17:15:33,078 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 17:15:33,079 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) [2022-07-21 17:15:33,080 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2022-07-21 17:15:33,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:33,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 13 conjunts are in the unsatisfiable core [2022-07-21 17:15:33,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:33,232 INFO L390 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 [2022-07-21 17:15:33,335 INFO L356 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-07-21 17:15:33,335 INFO L390 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 18 treesize of output 25 [2022-07-21 17:15:33,363 INFO L356 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2022-07-21 17:15:33,364 INFO L390 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 [2022-07-21 17:15:33,378 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:33,378 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:15:33,522 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:33,522 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 17:15:33,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1012669110] [2022-07-21 17:15:33,522 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1012669110] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-21 17:15:33,522 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 17:15:33,522 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2022-07-21 17:15:33,522 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1110798813] [2022-07-21 17:15:33,523 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 17:15:33,523 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-07-21 17:15:33,523 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 17:15:33,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-07-21 17:15:33,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2022-07-21 17:15:33,524 INFO L87 Difference]: Start difference. First operand 141 states and 150 transitions. Second operand has 8 states, 7 states have (on average 5.857142857142857) internal successors, (41), 6 states have internal predecessors, (41), 1 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-07-21 17:15:33,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:33,811 INFO L93 Difference]: Finished difference Result 164 states and 179 transitions. [2022-07-21 17:15:33,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-21 17:15:33,812 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 5.857142857142857) internal successors, (41), 6 states have internal predecessors, (41), 1 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 31 [2022-07-21 17:15:33,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:33,813 INFO L225 Difference]: With dead ends: 164 [2022-07-21 17:15:33,813 INFO L226 Difference]: Without dead ends: 164 [2022-07-21 17:15:33,813 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 49 SyntacticMatches, 5 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2022-07-21 17:15:33,814 INFO L413 NwaCegarLoop]: 87 mSDtfsCounter, 28 mSDsluCounter, 302 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 389 SdHoareTripleChecker+Invalid, 289 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 108 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:33,814 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 389 Invalid, 289 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 175 Invalid, 0 Unknown, 108 Unchecked, 0.3s Time] [2022-07-21 17:15:33,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2022-07-21 17:15:33,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 152. [2022-07-21 17:15:33,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 110 states have (on average 1.4) internal successors, (154), 144 states have internal predecessors, (154), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (7), 3 states have call predecessors, (7), 5 states have call successors, (7) [2022-07-21 17:15:33,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 166 transitions. [2022-07-21 17:15:33,818 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 166 transitions. Word has length 31 [2022-07-21 17:15:33,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:33,818 INFO L495 AbstractCegarLoop]: Abstraction has 152 states and 166 transitions. [2022-07-21 17:15:33,818 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 5.857142857142857) internal successors, (41), 6 states have internal predecessors, (41), 1 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-07-21 17:15:33,818 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 166 transitions. [2022-07-21 17:15:33,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-07-21 17:15:33,821 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:33,821 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:33,835 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2022-07-21 17:15:34,030 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 17:15:34,031 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting appendErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:34,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:34,031 INFO L85 PathProgramCache]: Analyzing trace with hash 842656369, now seen corresponding path program 1 times [2022-07-21 17:15:34,031 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 17:15:34,031 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1226186311] [2022-07-21 17:15:34,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:34,032 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 17:15:34,032 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 17:15:34,033 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 17:15:34,034 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2022-07-21 17:15:34,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:34,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 20 conjunts are in the unsatisfiable core [2022-07-21 17:15:34,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:34,242 INFO L390 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 [2022-07-21 17:15:34,246 INFO L390 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 [2022-07-21 17:15:36,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 17:15:36,368 INFO L390 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 [2022-07-21 17:15:36,375 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-21 17:15:36,376 INFO L390 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 12 treesize of output 12 [2022-07-21 17:15:36,428 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-07-21 17:15:36,429 INFO L390 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 [2022-07-21 17:15:36,469 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:36,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:15:41,646 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 17:15:41,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1226186311] [2022-07-21 17:15:41,646 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1226186311] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:15:41,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1217372469] [2022-07-21 17:15:41,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:41,646 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-21 17:15:41,646 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-21 17:15:41,648 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-07-21 17:15:41,650 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (21)] Waiting until timeout for monitored process [2022-07-21 17:15:41,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:41,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 20 conjunts are in the unsatisfiable core [2022-07-21 17:15:41,898 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:41,907 INFO L390 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 [2022-07-21 17:15:41,910 INFO L390 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 [2022-07-21 17:15:42,005 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 17:15:42,006 INFO L390 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 [2022-07-21 17:15:42,013 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-21 17:15:42,013 INFO L390 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 12 treesize of output 12 [2022-07-21 17:15:42,052 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-07-21 17:15:42,053 INFO L390 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 [2022-07-21 17:15:42,078 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:42,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:15:48,389 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1217372469] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:15:48,389 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 17:15:48,389 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2022-07-21 17:15:48,390 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1211781453] [2022-07-21 17:15:48,390 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 17:15:48,390 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-07-21 17:15:48,390 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 17:15:48,390 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-07-21 17:15:48,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=102, Unknown=3, NotChecked=0, Total=132 [2022-07-21 17:15:48,391 INFO L87 Difference]: Start difference. First operand 152 states and 166 transitions. Second operand has 8 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 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) [2022-07-21 17:15:48,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:15:48,663 INFO L93 Difference]: Finished difference Result 163 states and 183 transitions. [2022-07-21 17:15:48,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-07-21 17:15:48,664 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 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 31 [2022-07-21 17:15:48,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:15:48,665 INFO L225 Difference]: With dead ends: 163 [2022-07-21 17:15:48,665 INFO L226 Difference]: Without dead ends: 163 [2022-07-21 17:15:48,665 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 63 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=37, Invalid=142, Unknown=3, NotChecked=0, Total=182 [2022-07-21 17:15:48,666 INFO L413 NwaCegarLoop]: 90 mSDtfsCounter, 9 mSDsluCounter, 288 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 378 SdHoareTripleChecker+Invalid, 207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 87 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 17:15:48,666 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 378 Invalid, 207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 115 Invalid, 0 Unknown, 87 Unchecked, 0.2s Time] [2022-07-21 17:15:48,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2022-07-21 17:15:48,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 159. [2022-07-21 17:15:48,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 116 states have (on average 1.3879310344827587) internal successors, (161), 149 states have internal predecessors, (161), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (8), 4 states have call predecessors, (8), 6 states have call successors, (8) [2022-07-21 17:15:48,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 175 transitions. [2022-07-21 17:15:48,671 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 175 transitions. Word has length 31 [2022-07-21 17:15:48,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:15:48,671 INFO L495 AbstractCegarLoop]: Abstraction has 159 states and 175 transitions. [2022-07-21 17:15:48,671 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 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) [2022-07-21 17:15:48,671 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 175 transitions. [2022-07-21 17:15:48,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-07-21 17:15:48,672 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:15:48,672 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:15:48,683 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2022-07-21 17:15:48,886 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (21)] Ended with exit code 0 [2022-07-21 17:15:49,083 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2022-07-21 17:15:49,083 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting appendErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:15:49,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:15:49,084 INFO L85 PathProgramCache]: Analyzing trace with hash -507885641, now seen corresponding path program 1 times [2022-07-21 17:15:49,084 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 17:15:49,084 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1787993488] [2022-07-21 17:15:49,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:49,085 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 17:15:49,085 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 17:15:49,086 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) [2022-07-21 17:15:49,088 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2022-07-21 17:15:49,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:49,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 20 conjunts are in the unsatisfiable core [2022-07-21 17:15:49,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:49,280 INFO L390 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 [2022-07-21 17:15:49,285 INFO L390 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 [2022-07-21 17:15:51,481 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 17:15:51,482 INFO L390 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 [2022-07-21 17:15:51,494 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-21 17:15:51,495 INFO L390 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 12 treesize of output 12 [2022-07-21 17:15:51,575 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-07-21 17:15:51,575 INFO L390 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 [2022-07-21 17:15:51,659 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:51,660 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:15:55,350 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 17:15:55,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1787993488] [2022-07-21 17:15:55,350 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1787993488] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:15:55,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2035676642] [2022-07-21 17:15:55,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:15:55,351 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-21 17:15:55,351 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-21 17:15:55,352 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-07-21 17:15:55,353 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2022-07-21 17:15:55,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:15:55,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 21 conjunts are in the unsatisfiable core [2022-07-21 17:15:55,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:15:55,618 INFO L390 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 [2022-07-21 17:15:55,623 INFO L390 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 [2022-07-21 17:15:55,744 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 17:15:55,745 INFO L390 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 [2022-07-21 17:15:55,751 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-21 17:15:55,751 INFO L390 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 12 treesize of output 12 [2022-07-21 17:15:55,783 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-07-21 17:15:55,783 INFO L390 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 [2022-07-21 17:15:55,860 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:15:55,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:16:00,238 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2035676642] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:16:00,238 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 17:16:00,238 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 8 [2022-07-21 17:16:00,238 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [237594427] [2022-07-21 17:16:00,238 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 17:16:00,239 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-07-21 17:16:00,239 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 17:16:00,239 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-07-21 17:16:00,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=124, Unknown=2, NotChecked=0, Total=156 [2022-07-21 17:16:00,240 INFO L87 Difference]: Start difference. First operand 159 states and 175 transitions. Second operand has 9 states, 8 states have (on average 5.0) internal successors, (40), 7 states have internal predecessors, (40), 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) [2022-07-21 17:16:02,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:16:02,545 INFO L93 Difference]: Finished difference Result 168 states and 190 transitions. [2022-07-21 17:16:02,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-21 17:16:02,546 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 5.0) internal successors, (40), 7 states have internal predecessors, (40), 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 34 [2022-07-21 17:16:02,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:16:02,548 INFO L225 Difference]: With dead ends: 168 [2022-07-21 17:16:02,548 INFO L226 Difference]: Without dead ends: 168 [2022-07-21 17:16:02,548 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 74 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=41, Invalid=166, Unknown=3, NotChecked=0, Total=210 [2022-07-21 17:16:02,549 INFO L413 NwaCegarLoop]: 94 mSDtfsCounter, 14 mSDsluCounter, 302 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 396 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 88 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 17:16:02,549 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 396 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 115 Invalid, 0 Unknown, 88 Unchecked, 0.2s Time] [2022-07-21 17:16:02,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-07-21 17:16:02,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 162. [2022-07-21 17:16:02,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 119 states have (on average 1.3865546218487395) internal successors, (165), 152 states have internal predecessors, (165), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (8), 4 states have call predecessors, (8), 6 states have call successors, (8) [2022-07-21 17:16:02,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 179 transitions. [2022-07-21 17:16:02,560 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 179 transitions. Word has length 34 [2022-07-21 17:16:02,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:16:02,560 INFO L495 AbstractCegarLoop]: Abstraction has 162 states and 179 transitions. [2022-07-21 17:16:02,561 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 5.0) internal successors, (40), 7 states have internal predecessors, (40), 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) [2022-07-21 17:16:02,561 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 179 transitions. [2022-07-21 17:16:02,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-07-21 17:16:02,564 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:16:02,564 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:16:02,578 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2022-07-21 17:16:02,779 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (23)] Forceful destruction successful, exit code 0 [2022-07-21 17:16:02,976 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2022-07-21 17:16:02,976 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting appendErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:16:02,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:16:02,976 INFO L85 PathProgramCache]: Analyzing trace with hash 1435420859, now seen corresponding path program 1 times [2022-07-21 17:16:02,977 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 17:16:02,977 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1059848616] [2022-07-21 17:16:02,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:16:02,977 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 17:16:02,977 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 17:16:02,978 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 17:16:02,982 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2022-07-21 17:16:03,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:16:03,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 20 conjunts are in the unsatisfiable core [2022-07-21 17:16:03,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:16:03,172 INFO L390 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 [2022-07-21 17:16:03,176 INFO L390 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 [2022-07-21 17:16:05,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 17:16:05,306 INFO L390 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 [2022-07-21 17:16:05,312 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-21 17:16:05,313 INFO L390 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 12 treesize of output 12 [2022-07-21 17:16:05,370 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-07-21 17:16:05,370 INFO L390 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 [2022-07-21 17:16:05,484 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:16:05,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:16:09,568 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 17:16:09,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1059848616] [2022-07-21 17:16:09,569 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1059848616] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:16:09,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1511043946] [2022-07-21 17:16:09,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:16:09,569 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-07-21 17:16:09,569 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-07-21 17:16:09,570 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-07-21 17:16:09,572 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2022-07-21 17:16:09,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:16:09,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 22 conjunts are in the unsatisfiable core [2022-07-21 17:16:09,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:16:09,948 INFO L390 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 [2022-07-21 17:16:09,951 INFO L390 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 [2022-07-21 17:16:10,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-07-21 17:16:10,079 INFO L390 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 [2022-07-21 17:16:10,086 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-07-21 17:16:10,086 INFO L390 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 12 treesize of output 12 [2022-07-21 17:16:10,126 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-07-21 17:16:10,127 INFO L390 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 [2022-07-21 17:16:10,240 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:16:10,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:16:15,083 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1511043946] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-21 17:16:15,084 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-21 17:16:15,084 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 8 [2022-07-21 17:16:15,084 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2011283147] [2022-07-21 17:16:15,084 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-21 17:16:15,084 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-07-21 17:16:15,084 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 17:16:15,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-07-21 17:16:15,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=221, Unknown=4, NotChecked=0, Total=272 [2022-07-21 17:16:15,085 INFO L87 Difference]: Start difference. First operand 162 states and 179 transitions. Second operand has 9 states, 8 states have (on average 5.125) internal successors, (41), 7 states have internal predecessors, (41), 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) [2022-07-21 17:16:15,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:16:15,452 INFO L93 Difference]: Finished difference Result 168 states and 189 transitions. [2022-07-21 17:16:15,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-07-21 17:16:15,452 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 5.125) internal successors, (41), 7 states have internal predecessors, (41), 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 35 [2022-07-21 17:16:15,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:16:15,453 INFO L225 Difference]: With dead ends: 168 [2022-07-21 17:16:15,453 INFO L226 Difference]: Without dead ends: 168 [2022-07-21 17:16:15,453 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 75 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=60, Invalid=278, Unknown=4, NotChecked=0, Total=342 [2022-07-21 17:16:15,454 INFO L413 NwaCegarLoop]: 94 mSDtfsCounter, 13 mSDsluCounter, 300 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 394 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 86 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-21 17:16:15,454 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 394 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 115 Invalid, 0 Unknown, 86 Unchecked, 0.3s Time] [2022-07-21 17:16:15,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-07-21 17:16:15,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 164. [2022-07-21 17:16:15,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 121 states have (on average 1.3801652892561984) internal successors, (167), 154 states have internal predecessors, (167), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (8), 4 states have call predecessors, (8), 6 states have call successors, (8) [2022-07-21 17:16:15,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 181 transitions. [2022-07-21 17:16:15,459 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 181 transitions. Word has length 35 [2022-07-21 17:16:15,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:16:15,459 INFO L495 AbstractCegarLoop]: Abstraction has 164 states and 181 transitions. [2022-07-21 17:16:15,460 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 5.125) internal successors, (41), 7 states have internal predecessors, (41), 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) [2022-07-21 17:16:15,460 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 181 transitions. [2022-07-21 17:16:15,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-07-21 17:16:15,460 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:16:15,461 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:16:15,468 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (25)] Ended with exit code 0 [2022-07-21 17:16:15,669 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2022-07-21 17:16:15,861 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 17:16:15,861 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting appendErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:16:15,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:16:15,862 INFO L85 PathProgramCache]: Analyzing trace with hash 748730840, now seen corresponding path program 1 times [2022-07-21 17:16:15,862 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 17:16:15,862 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2020215905] [2022-07-21 17:16:15,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:16:15,863 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 17:16:15,863 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 17:16:15,864 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-07-21 17:16:15,865 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2022-07-21 17:16:15,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:16:16,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 5 conjunts are in the unsatisfiable core [2022-07-21 17:16:16,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:16:16,078 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:16:16,078 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-21 17:16:16,078 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 17:16:16,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2020215905] [2022-07-21 17:16:16,078 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2020215905] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-21 17:16:16,078 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-21 17:16:16,078 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-07-21 17:16:16,079 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2095652916] [2022-07-21 17:16:16,079 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-21 17:16:16,079 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-07-21 17:16:16,079 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-07-21 17:16:16,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-07-21 17:16:16,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-07-21 17:16:16,080 INFO L87 Difference]: Start difference. First operand 164 states and 181 transitions. Second operand has 6 states, 5 states have (on average 6.8) internal successors, (34), 5 states have internal predecessors, (34), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-07-21 17:16:16,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-21 17:16:16,285 INFO L93 Difference]: Finished difference Result 163 states and 178 transitions. [2022-07-21 17:16:16,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-07-21 17:16:16,286 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 6.8) internal successors, (34), 5 states have internal predecessors, (34), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2022-07-21 17:16:16,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-21 17:16:16,287 INFO L225 Difference]: With dead ends: 163 [2022-07-21 17:16:16,287 INFO L226 Difference]: Without dead ends: 163 [2022-07-21 17:16:16,287 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2022-07-21 17:16:16,288 INFO L413 NwaCegarLoop]: 104 mSDtfsCounter, 124 mSDsluCounter, 216 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 320 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-07-21 17:16:16,288 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [125 Valid, 320 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-07-21 17:16:16,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2022-07-21 17:16:16,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 160. [2022-07-21 17:16:16,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 121 states have (on average 1.3471074380165289) internal successors, (163), 150 states have internal predecessors, (163), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (8), 4 states have call predecessors, (8), 6 states have call successors, (8) [2022-07-21 17:16:16,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 177 transitions. [2022-07-21 17:16:16,293 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 177 transitions. Word has length 37 [2022-07-21 17:16:16,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-21 17:16:16,293 INFO L495 AbstractCegarLoop]: Abstraction has 160 states and 177 transitions. [2022-07-21 17:16:16,293 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 6.8) internal successors, (34), 5 states have internal predecessors, (34), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-07-21 17:16:16,293 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 177 transitions. [2022-07-21 17:16:16,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-07-21 17:16:16,294 INFO L187 NwaCegarLoop]: Found error trace [2022-07-21 17:16:16,294 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-21 17:16:16,304 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (26)] Ended with exit code 0 [2022-07-21 17:16:16,504 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 17:16:16,504 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting appendErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-07-21 17:16:16,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-21 17:16:16,505 INFO L85 PathProgramCache]: Analyzing trace with hash -28201477, now seen corresponding path program 1 times [2022-07-21 17:16:16,505 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-07-21 17:16:16,505 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [545465758] [2022-07-21 17:16:16,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-21 17:16:16,505 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-07-21 17:16:16,505 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-07-21 17:16:16,506 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) [2022-07-21 17:16:16,507 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2022-07-21 17:16:16,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-21 17:16:16,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 34 conjunts are in the unsatisfiable core [2022-07-21 17:16:16,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-21 17:16:16,769 INFO L390 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 [2022-07-21 17:16:16,793 INFO L356 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2022-07-21 17:16:16,794 INFO L390 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 [2022-07-21 17:16:16,966 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-07-21 17:16:17,032 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-07-21 17:16:17,033 INFO L390 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 16 treesize of output 22 [2022-07-21 17:16:17,043 INFO L390 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 7 treesize of output 3 [2022-07-21 17:16:17,123 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-07-21 17:16:17,123 INFO L390 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 20 treesize of output 26 [2022-07-21 17:16:17,254 INFO L356 Elim1Store]: treesize reduction 75, result has 15.7 percent of original size [2022-07-21 17:16:17,254 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 45 treesize of output 76 [2022-07-21 17:16:17,451 INFO L356 Elim1Store]: treesize reduction 62, result has 37.4 percent of original size [2022-07-21 17:16:17,452 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 63 treesize of output 86 [2022-07-21 17:16:17,522 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 37 [2022-07-21 17:16:17,627 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 37 [2022-07-21 17:16:17,671 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 37 [2022-07-21 17:16:17,717 INFO L390 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 32 treesize of output 14 [2022-07-21 17:16:17,753 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-21 17:16:17,753 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-21 17:16:17,815 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1309 (Array (_ BitVec 32) (_ BitVec 32)))) (= (select |c_#valid| (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_1309) c_append_~head.base) (bvadd (_ bv4 32) c_append_~head.offset))) (_ bv1 1))) is different from false [2022-07-21 17:16:17,873 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1309 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_1306 (_ BitVec 1)) (v_append_~node~0.base_55 (_ BitVec 32))) (or (not (= (bvneg (select |c_#valid| v_append_~node~0.base_55)) (_ bv0 1))) (= (select (store |c_#valid| v_append_~node~0.base_55 v_ArrVal_1306) (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_55 v_ArrVal_1309) |c_append_#in~head.base|) (bvadd (_ bv4 32) |c_append_#in~head.offset|))) (_ bv1 1)))) is different from false [2022-07-21 17:16:17,887 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1309 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_1306 (_ BitVec 1)) (v_append_~node~0.base_55 (_ BitVec 32))) (or (not (= (bvneg (select |c_#valid| v_append_~node~0.base_55)) (_ bv0 1))) (= (select (store |c_#valid| v_append_~node~0.base_55 v_ArrVal_1306) (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_55 v_ArrVal_1309) |c_ULTIMATE.start_main_~list~0#1.base|) (bvadd (_ bv4 32) |c_ULTIMATE.start_main_~list~0#1.offset|))) (_ bv1 1)))) is different from false [2022-07-21 17:16:18,038 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-07-21 17:16:18,038 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 34 [2022-07-21 17:16:18,042 INFO L390 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 173 treesize of output 113 [2022-07-21 17:16:18,048 INFO L390 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 44 treesize of output 40 [2022-07-21 17:16:18,053 INFO L390 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 82 treesize of output 74 [2022-07-21 17:16:18,078 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-07-21 17:16:18,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [545465758] [2022-07-21 17:16:18,079 WARN L319 FreeRefinementEngine]: Global settings require throwing the following exception [2022-07-21 17:16:18,091 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2022-07-21 17:16:18,279 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-07-21 17:16:18,280 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.AssertionError: Quantifier not flattened at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPushUtilsForLocalEliminatees.findSomePushableLocalEliminateeSet(QuantifierPushUtilsForLocalEliminatees.java:180) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPushUtilsForLocalEliminatees.pushLocalEliminateesOverCorrespondingFiniteJunction(QuantifierPushUtilsForLocalEliminatees.java:97) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPushUtils.preprocessDualFiniteJunction(QuantifierPushUtils.java:188) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.tryToPushOverDualFiniteConnective(QuantifierPusher.java:326) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPushTermWalker.convert(QuantifierPushTermWalker.java:176) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPushTermWalker.convert(QuantifierPushTermWalker.java:1) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.TermContextTransformationEngine.transform(TermContextTransformationEngine.java:65) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.TermContextTransformationEngine.transform(TermContextTransformationEngine.java:61) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPushTermWalker.eliminate(QuantifierPushTermWalker.java:265) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPushTermWalker.eliminate(QuantifierPushTermWalker.java:251) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.PartialQuantifierElimination.eliminate(PartialQuantifierElimination.java:90) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer$QuantifierEliminationPostprocessor.postprocess(IterativePredicateTransformer.java:238) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer.applyPostprocessors(IterativePredicateTransformer.java:420) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer.computeBackwardSequence(IterativePredicateTransformer.java:364) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer.computeWeakestPreconditionSequence(IterativePredicateTransformer.java:271) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.computeInterpolantsUsingUnsatCore(TraceCheckSpWp.java:342) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.computeInterpolants(TraceCheckSpWp.java:185) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.(TraceCheckSpWp.java:163) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSpWp.construct(IpTcStrategyModuleSpWp.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSpWp.construct(IpTcStrategyModuleSpWp.java:1) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.isCorrect(IpTcStrategyModuleBase.java:57) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.checkFeasibility(AutomatonFreeRefinementEngine.java:209) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:121) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:248) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:409) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:300) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:260) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:173) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:152) 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) [2022-07-21 17:16:18,282 INFO L158 Benchmark]: Toolchain (without parser) took 61977.14ms. Allocated memory was 52.4MB in the beginning and 83.9MB in the end (delta: 31.5MB). Free memory was 28.4MB in the beginning and 35.2MB in the end (delta: -6.7MB). Peak memory consumption was 25.0MB. Max. memory is 16.1GB. [2022-07-21 17:16:18,282 INFO L158 Benchmark]: CDTParser took 0.17ms. Allocated memory is still 52.4MB. Free memory was 33.3MB in the beginning and 33.2MB in the end (delta: 47.9kB). There was no memory consumed. Max. memory is 16.1GB. [2022-07-21 17:16:18,282 INFO L158 Benchmark]: CACSL2BoogieTranslator took 432.06ms. Allocated memory was 52.4MB in the beginning and 69.2MB in the end (delta: 16.8MB). Free memory was 28.2MB in the beginning and 45.1MB in the end (delta: -16.8MB). Peak memory consumption was 3.7MB. Max. memory is 16.1GB. [2022-07-21 17:16:18,283 INFO L158 Benchmark]: Boogie Procedure Inliner took 63.09ms. Allocated memory is still 69.2MB. Free memory was 45.1MB in the beginning and 43.0MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-07-21 17:16:18,283 INFO L158 Benchmark]: Boogie Preprocessor took 61.63ms. Allocated memory is still 69.2MB. Free memory was 43.0MB in the beginning and 41.1MB in the end (delta: 1.9MB). There was no memory consumed. Max. memory is 16.1GB. [2022-07-21 17:16:18,283 INFO L158 Benchmark]: RCFGBuilder took 674.69ms. Allocated memory is still 69.2MB. Free memory was 41.1MB in the beginning and 34.9MB in the end (delta: 6.2MB). Peak memory consumption was 12.5MB. Max. memory is 16.1GB. [2022-07-21 17:16:18,283 INFO L158 Benchmark]: TraceAbstraction took 60738.64ms. Allocated memory was 69.2MB in the beginning and 83.9MB in the end (delta: 14.7MB). Free memory was 34.2MB in the beginning and 35.2MB in the end (delta: -973.6kB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. [2022-07-21 17:16:18,284 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17ms. Allocated memory is still 52.4MB. Free memory was 33.3MB in the beginning and 33.2MB in the end (delta: 47.9kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 432.06ms. Allocated memory was 52.4MB in the beginning and 69.2MB in the end (delta: 16.8MB). Free memory was 28.2MB in the beginning and 45.1MB in the end (delta: -16.8MB). Peak memory consumption was 3.7MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 63.09ms. Allocated memory is still 69.2MB. Free memory was 45.1MB in the beginning and 43.0MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 61.63ms. Allocated memory is still 69.2MB. Free memory was 43.0MB in the beginning and 41.1MB in the end (delta: 1.9MB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 674.69ms. Allocated memory is still 69.2MB. Free memory was 41.1MB in the beginning and 34.9MB in the end (delta: 6.2MB). Peak memory consumption was 12.5MB. Max. memory is 16.1GB. * TraceAbstraction took 60738.64ms. Allocated memory was 69.2MB in the beginning and 83.9MB in the end (delta: 14.7MB). Free memory was 34.2MB in the beginning and 35.2MB in the end (delta: -973.6kB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: AssertionError: Quantifier not flattened de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: AssertionError: Quantifier not flattened: de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPushUtilsForLocalEliminatees.findSomePushableLocalEliminateeSet(QuantifierPushUtilsForLocalEliminatees.java:180) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2022-07-21 17:16:18,308 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 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: ERROR: ExceptionOrErrorResult: AssertionError: Quantifier not flattened